Steve

An elephant herd started moving at a rate of 6 mph. One elephant stood still and was left behind. Then the stray elephant began running at a rate of 10 mph to reach the herd. The stray caught up in 5 minutes. How long (in hours) did the stray run to catch...

19 years ago

Fungal laccase is .390% Cu by mass. If a fungal laccase molecule contains 4 Cu atoms, what is the molar mass of fungal laccase? Molar mass= mass of 4Cuatoms/.390

18 years ago

Rex Corp's EBITDA last year was $385,000 (= EBIT + depreciation + amortization), its interest charges were $10,000, it had to repay $25,000 of long term debt, and it had to make a payment of $20,000 under a long term lease. The firm had no amortization ch...

18 years ago

If a car travels westward with a constant velocity of 20 m/s, what is the net external force acting on it?

18 years ago

How do you tell what type of solid (atomic, molecular, ionic, covalent network) will any substance form (i.e. PH3, H2, acetate)? I know that its mainly determined by what is at the lattice points but still have no clue how to go about it.

17 years ago

The geography of consumption if different from geography of production. Why? What does it mean to say that our geographies of consumption are becoming increasingly disjunct from the geographies of other aspects of our everyday lives (work, school, etc)? w...

17 years ago

When you complete a acid base titration of NaOH and HCl and how to you find the molarity/concentration of HCl. I used 9 mL of HCl with 50 mL of water. But when solving for concentration, do I use 9 mL or 59 mL (water + HCl)? Also, does the water in the HC...

17 years ago

In a lab I did, I put slices of potatos in varying amounts of sugar concentrations and one control group which contained only water and no sugar. What is suppose to happen? My data tells me that the potato weighed heavier after a day of being submerged. I...

17 years ago

What is 260x126?

17 years ago

Take into account the Earth's rotational speed (1 rev/day) and determine the necessary speed, with respect to the Earth, for a rocket to escape if fired from the Earth at the equator in a direction a) eastward; b) westward; c) vertically upward. The answe...

17 years ago

Thanks a lot to everybody who helps answer (not just my questions), I am so grateful . . . Thank you, thank you.

17 years ago

I have to do thirty problems in which I must find the subject, verb, direct object, indirect object, predicate nominative, and predicate adjective. In a nutshell, I am completely lost, can you help?

17 years ago

Is this an argument? If the recent evidence of deterrence is shown to be correct, then opponents of capital punishment will face an uphill struggle on moral grounds. Premise: If the recent evidence of deterrence is shown to be correct Conclusion: then opp...

17 years ago

200 people were sampled and the following table shows the number of people with a certain average electric energy usage based upon the type of home an individual lives in: Electric Usage (in kWh) Type of Dwelling < 5,000 5,000 – 7,000 7,000 – 11,000 11,00...

17 years ago

HI! I'm making an acrostic poem about Apollo Eleven for my science class. I need help making one, so can someone give me a word for some of the letters?....(mostly the E's) A (astronauts) P O (outer space) L L (landing) O E L E V E N

17 years ago

Convert to polar coordinates with r greater than or equzl to 0 and theta between 0 degrees and 360 degrees Write the equation inpolar coordinates x squared + y squared = 2

17 years ago

6(x^2 -2) = 12

17 years ago

Which of the following is a demand-increasing factor in the health care market? A. rising incomes B. the aging of the population C. asymmetric information D. all of the above

17 years ago

What is the sum when the upper bound of summation is infinite and n=1: (1-2)^n -10 *This is sigma by the way* so it's: ∞ Sum((1-2)^n - 10 n=1

17 years ago

A 12.5843 g sample of ZrBr4 was dissolved and, after several chemical steps, all of the combined Bromine was precipitated as AgBr. The silver content of the AgBr was found to be 13.2160 g. Assume the atomic weights of silver and bromine to be 107.870 and...

17 years ago

My AP English class has to write 250-500 word paper on changes that resulted from 9/11. This is the first paper I will have written for an AP class. Please tell me if this is acceptable in an AP class. Thanks. September 11th A Temporary Change Prior to th...

17 years ago

In searching the bottom of a pool at night, a watchman shines a narrow beam of light from his flashlight, 1.3 m above the water level, onto the surface of the water at a point 2.7m from the edge of the pool. Where does the spot of light hit the bottom of...

17 years ago

from january 3 to january 7, buffalo recorded the following daily high temperatures: 5 degree 7 degree 6 degree 5 degree and 7 degree. which statement about the temperature is true? EXPLAIN. 1 mean=median 2 median= mode 3 mean=mode 4 mean<median

17 years ago

Hello, I am having trouble with a question from my chem lab. Here is my data Weight of empty crucible and cover = 21.113 g Weight of crucible, cover, MgO and Mg3N2 = 21.906 g Weight of crucible, cover, MgOand addition of H2O and heat =21.909 g The change...

17 years ago

A 0.145-kg baseball traveling 35.0 m/s strikes the catcher's mitt which, in bring the ball to rest, recoils backward 11.0 cm. What was the average force applied by the ball on the glove?

17 years ago

A person pushes a 14.5 kg lawnmower at constant speed with a force of 88 N directed along the handle, which is at an angle of 45o to the horizontal. What is the force required to accelerate it from rest to 1.5 m/s in 2.5 seconds?

17 years ago

A man owned 75 shares of stock worth $50 each. The corporation declared a dividend of 8%, payable in stock. How many shares did he own?

16 years ago

A=i –2j B=-3i+j How do I find the component of A that is perpendicular to B in vector form?

16 years ago

a hand exerts a constant horizontal force on a block that is free to slide on a frictionles surface. the block starts from rest at point A and by the time it has traveled a distance d to point B it is traveling with speed Vb. WHen the block has traveled a...

16 years ago

A 1300-kg space vehicle falls vertically from a height of 2500 km above the earth's surface. Determine how much work is done by the force of gravity in bringing the vehicle to the earth's surface.

16 years ago

Im trying to find out who saved the dunes of Lake Michigan.. I have looked all over but can't figuer it out.. the question is .. "Blank worked to save the dunes of Lake Michigan."

16 years ago

I believe over the next year I am going to sell 250,000 units. However, there is a 15% chance I will only sell 120,000 and 5% chance that I will only sell 40,000 units. What equation should I use to determine my demand?

16 years ago

a rocket following a parabolic path through the air suddenly explodes into many pieces. what can you say about the motion of this system. and If only an external force can change the momentum of the center of mass of an object, how can the internal force...

16 years ago

In a physics lab, a small cude slides down a frictionless incline, and elastically strikes a cube at the bottom of the inclince that is only one-half its mass. If the incline is 30 cm high and the table is 90 cm off the floor, where does each cube land? I...

16 years ago

Please provide a detailed description of both the Avignon Papacy and the Hundred Years War, and tell me how each contributed to the end of the Middle Ages.

16 years ago

During Pope Urban II's plea. Which two factors contributed most to the formation of the crusading spirit?

16 years ago

What were some of Pope Urbans Pleas?

16 years ago

What is Pluralism and why would contemporary people might find them so objectionable.

16 years ago

How did the Black Death cause social problems in europe? Give Example

16 years ago

I'm doing a physics project where I have to find plans for a device and then build it and type a report demonstrating the physics behind it. However, the materials can't cost more than $75 total. I'm having trouble finding any plans, especially ones that...

16 years ago

KOH + KHP --- balanced equation???

16 years ago

Find the angle of refraction if there is one. If there isn't, tell which substance reflects the light: n=1.36 ~~~~~~~~~~~Angle=15.60 degrees n=1.73 ~~~~~~~~~~~Angle=17.94 degrees n=1.51 ~~~~~~~~~~~Angle=27.71 degrees n=1.0003 ~~~~~~~~~~~Angle=11.08 degree...

16 years ago

Charge q1 = 6 uC is at the origin, charge q2 = 7 uC is at y = 2m, x = 0, charge q3 = 1.5 uC is at y = -1 m, x = 0. What is the force on q2?

16 years ago

write a balanced half-reaction for the reduction of permanganate ion, Mn04, to Mn02 in a basic solution

16 years ago

The following reaction occurs spontaneously. 2H+(aq)+ca(s) Ca2+(aq)+H2(g) write the balanced reduction half-reaction

16 years ago

A 50 ml sample fo 0.240M NH3(aq) is titrated with aqueous hydrochloric acid. What is the pH after the addition fo 15.0 ml of 0.0600M HCl(aq)? (kb of NH3 = 1.8 x 10^5)

16 years ago

A 50ml sample of vinegar is titrated with 0.774M NaOH(aq). If the titration requires 41.6ml of NaOH(aq), what is the concentration of acetic acid in the vinegar?

16 years ago

Potassium hydrogen phthalate (molar mass = 204.2 g/mol is used to standardize sodium hydroxide. If 23.67 ml of NaOH (aq) is required to titrate 0.7719 g KHP to the equivalence point, what is the concentration of the NaOH(aq)? HC8H4O4-(aq) + OH-(aq) = C8H4...

16 years ago

Calculate the standard reduction potential for the following reaction at 25 degrees Celsius Ag(NH3)2^+(aq) +e^- ==> Ag(s) + 2 NH3(aq) given the following thermodynamic information Ag^+(aq) + e^- ==>Ag(s) E naught = 0.799V Ag^+(aq) + 2NH3(aq) ==> Ag(NH3)2^...

16 years ago

Given the following two half-reactions, determine which overall reaction is spontaneous and calculate its standard cell potential. Cd^2+(aq) + 2e^- ==> Cd(s) E naught = -1.21V Sn^2+ + 2e^- ==Sn(s) E naught = -0.14V

16 years ago

One kind of battery used in watches contains mercury(II) oxide. As current flows, the mercury oxide is reduced to mercury. HgO(s) + H2O(l) + 2e^- ==> Hg(l) + 2 OH^-(aq) If 2.5 x 10^-5 amperes flows continuously for 1095 days, what mass of Hg(l) is produce...

16 years ago

Consider the half-reactions: Cu^2+(aq) +2e^- ==> Cu(s) E naught = +0.34V Sn^2+(aq) + 2e^- ==> Sn E naught = -0.14V Fe^2+ + 2e^- ==> Fe(s) E naught = -0.44V Al^3+(aq) = 3e^- ==> Al(s) E naught = -1.66V Mg^2+(aq) = 2e^- ==> Mg(s) E naught = -2.37V Which met...

16 years ago

Calculate E naught cell for the reaction b 5Cd(s) + 2MnO4-(aq) + 16H+(aq) ==> 5Cd^2+(aq) = 2Mn^2+(aq) + 8H2O(l) given the following standard reduction potentials MnO4^-(aq) + 8H^+(aq) = 5e^- ==> Mn^2+(aq) + 4 H2O(l) E naught = +1.52V Cd^2+(aq) + 2e^- ==>...

16 years ago

Calc1ulate E for the following electrochemical cell at 25 degrees Celsius Pt(s) ! Sn^2+ (aq, 0.50M), S^4+(aq, 0.50M !!I^-(aq, 0.15M) ! AgI(s) ! Ag(s)! given the following standard reduction potentials. AgI(s) = e^- ==> Ag(s) + I^-(aq) E naught = -0.15V Sn...

16 years ago

What change in coulombs, is required to deposit 0.301 g Cu(s) from a solution of Cu^2+(aq)

16 years ago

What charge in coulombs is required to deposit 0.301g Cu(s) from a solution of Cu^2+? Cu^2+ 2e^- = Cu 0.301g/63.5g/mol = 4.7 x 10^-3 mol Cu (4.7 x 10^-3 mol Cu) (2 mol e^-/mol Cu) I should be able to mutiply that by 96,500 (Faraday number) to get 914C, bu...

16 years ago

A 50.0 ml sample of 0.0240 M NH(aq) is titrated with aqueous hydrochloric acid. What is the pH after the addition of 15.0 mL of 0.0600M HCl(aq)? (Kb of NH3= 1.8 x 10^-5) Initial amount of NH3 (0.0240)(0.05) = .0012 mol Amount of HCl added (0.0600)(.015) =...

16 years ago

A 20.0 mL sample of 0.20 M sodium acetate is titrated with 0.11 M HCl)aq). What is pH after the addition of50.0 mL HCl(aq)? Kbof CH3CO2^- = 5.6x10^-10) So far I have the Initial amount of sodium acetate (0.02)(0.20) = .004 mol Amount of HCl added (0.05)(0...

16 years ago

mol KHP = (0.7719g)(1 mol KHP/204.2g) = .0038mol Where are the moles of NaOH? I know that there are 0.02637 L of NaOH and I know M = mol/l I know there are 40g NaOH/mol NaOH There is 1 mol of NaOH in the balanced equation But I do not have grams of NaOH

16 years ago

MnO4^-(aq) + H20(l) ==> MnO2 + OH^- net charg is -1 +7 (-8) ==> 4(-4) Manganese is reduced MnO4^- +3e- ==> MnO2 H2) is the oxidizing agent in a basic solution Mno4^- + H2O(l) --> MnO2(s) + OH^- Add on OH^- to both sides of the equation for every H+ ion pr...

16 years ago

Calulate E naught cell for the reaction below 5 Cd(s) + 2 MnO4^-(aq) + 16H+(aq)+ 2 Mn2+(aq) + 8 HxsO(l) The oxidation anode must be 5Cd(s) ==> 5Cd2+(aq) +10e^- The reduction cathode must be 2MnO4^- + 16H2^=(aq) + 10e^- ==> 2Mn2+(aq) + 8H2O E naught cell =...

16 years ago

Okay, mol KHP = (0.7719)(mol KHP/204.2g KHP) = .0038mol Since this is a titration then the moles of NaOH = the moles of KHP M = mol/L M = .0038mol/02637 M = 0.01441

16 years ago

I'm going to need some help getting this problem started Calculate E for the following electrochemial cell at 25 degrees Celsius Pt(s) ! Sn^2+(aq, 0.50M), Sn^4+(aq, 0.50Mz0 !! I^-(aq, 0.15M) ! AgI(s) !Ag(s) given the following standard reduction potential...

16 years ago

I do not know how I should approach this problem either. The following electrochemial cell has a potential of+0.617V at 25 degrees Celsius Pt ! H2(g,1.00atm) ! H^+(aq,1.00M) !! Ag^+(aq) ! Ag The standard reduction potential ,E naught of Ag^+ = 0.700V. Wha...

16 years ago

how is chlorine neutralized using a compound containing sodium thiosulfate, what is the complete balanced equation for all species involved

16 years ago

how does sodium thiosulfate neutralize chlorine

16 years ago

What are the negative electrodes in these two systems? Pt, Br^-, Br2 !! Pt, Fe^2+, Fe^3+ and Pt, Br^-, Br2 !! Pt, I^-, I2

16 years ago

Pt, Br^-, Br2 !! Pt, Fe^2+, Fe^3+ What I found in the standard reduction table was Br2(l) + 2e^- ==> 2Br^-(aq) = 1.07 and Fe3+ ==> Fe2+ = 0.771 Are these the right values?

16 years ago

The standard free energy change for a chemical reaction is -18.3kJ/mole. What is the equilibrium constant for the reaction at 87 degrees Celsius? (R=8.314J/K*mol) Delta G = -Rtlnk -18,300/8.314/360 = -6.114

16 years ago

The thermochemical equation for the combustion of hexane is shown below. C6H14(g) + 19/2Os(g) ==> 6CO2(g) + 7H2O(g) Delta H = -4163kJ What is the enthalpy change for the combustion of 2.50g C6H14? 2.50 g/86g = .029 mol -4163kJ/.029 = -1.43 x 10^5kJ

16 years ago

For the raction A + 2B ==> C, the rate law is delta[C}/delta t = k{A][B]^2 What are the units of the rate constant where time is measured in seconds? I know the answer is 1/M^2-s How?

16 years ago

The decopostion of formic acid follows first-order kinetics. HCO2H(g)==>CO2(g) + H2(g) The half-life for the reaction at 550 degrees Celsius is 24 seconds. How many seconds does it take for the formic acid concentration to decrease by 75%?

16 years ago

Nitrogen dioxide reacts with carbon monoxide to produce nitrogen monoxide and carbon dioxide. NO2(g) + CO(g) ==>NO(g) + CO2(g) A proposed mechanism for this reaction is 2No2(g) = NO3(g) + NO(g) (fast,equilibrium) NO2(g) + CO(g) ==> NO2(g) + CO2(g) (slow)...

16 years ago

Hi, I have a test tomorrow and our teacher gave us a huge review worksheet. I am still not sure how to do some of these so I would appreciate if you could do the following problems out in all steps. I tried to pick some from each section. - Thanks :) 1. 7...

16 years ago

How much work must be done in stopping a 3,000 kg truck traveling at 60 mph?

16 years ago

How could you use y=2^x to determine the # of folds for the length of 128 ?

16 years ago

Verify the Identity (sin m +sin n)/ (cos m + cos n) = tan(m + n/2)

15 years ago

How democratic was the pre-war South?

15 years ago

Can anyone help me with these two optimization problems? A boat leaves a dock at 9:00 P.M. and travels due south at a speed of 20 km/h. Another boat has been heading due east at 15 km/h and reaches the same dock at 10:00 P.M. How many minutes after 9:00 P...

15 years ago

An ox exerts a force of 7100N to the horizontal direction without slipping. If the ox has a weight of 8000N, what is the minimum coefficient of static friction?

15 years ago

In a test of hypotheses, the null hypothesis is that the mean is 100 and the alternate hypothesis is that the mean is greater than 100. The power of the test when the mean is 101 would be greatest for which of the following choices of sample size n and si...

15 years ago

Rewrite cos4x as an equivalent expression that does not contain powers of trigonometric functions greater than 1.

15 years ago

Use a half-angle formula to find the exact value of cos 5ð/12

15 years ago

Find sin è/2 for sin è = 1/4 and è lies in Quadrant I.

15 years ago

Find sin è/2 for cos è = 1/4 and è lies in Quadrant I.

15 years ago

Find sin è/2 for sin è = - 3/5 and è lies in Quadrant IV

15 years ago

Cos 2x - cos 4x =.

15 years ago

Sin 2x - sin 4x =.

15 years ago

Find all solutions of the equation: cot x sec x = 2 cot x. A) x = 2ð/3 + nð or x = 4ð/3 + nð or 0 + nð B) x = 2ð/3 + 2nð or x = 4ð/3 + 2nð or 0 + nð C) x = ð/3 + 2nð or x = 5ð/3 + 2nð or 0 + nð D) x = ð/3 + nð or x = 5ð/3 + nð or 0 + nð

15 years ago

Find all solutions of the equation: 2 cosx + sqrt2 = 0 A) x = ð/4 + 2nð or x = 7ð/4 + 2nð B) x = 3ð/4 + 2nð or x = 5ð/4 + 2nð C) x = ð/4 + nð or x = 7ð/4 + nð D) x = 3ð/4 + nð or x = 5ð/4 + nð

15 years ago

If it were 2 hours later than it is right now, it would be half as long until midnight as it would be if it were an hour later than right now. What time is it?

15 years ago

1. In the story, Snow, through the story's first-person narration, the reader comes to understand A. Sister Zoe's opinions about teaching and politics. B. Yolanda's feelings about the world around her. C. President John F. Kennedy's views on Communist exp...

15 years ago

How could I put all these words: 1. Submit 2. Omit 3. Missionary 4. Emit 5. Remittance 6. Emissary 7. Permission 8. Transmit 9. Admit 10. Premise in one paragraph plz help and answer the question not just give in a tip plz

15 years ago

Why is it important to plant your vegetables in a different part of the garden each year.

15 years ago

Why is it a good idea to dig compost into the soil.

15 years ago

Why is it a good idea to give a potted plant some plant food every week or so

15 years ago

Give two reasons why soil may become poor in mineral nutrients.

15 years ago

Solve each linear equation by substitution. The answer is suppose to be (-2, -4) Thank you for your help. {-5x+3y=10 x-4y=14

15 years ago

By Week 8 Day 2 How are newer religions different from older ones? How are they similar?

15 years ago

Pulling up on a rope, you lift a 4.35-kg bucket of water from a well with an acceleration of 1.78m/s^2. What is the tension in the rope?

15 years ago

28 x x x ... x x 34 Let's use 13 numbers. So, the 7th is 30 28 x x x x x 30 x x x x x 34 If we want integers, there aren't that many between 30 and 34, so some will have to be used at least twice. Let's make the mode (29) occur 4 times: 28 28 29 29 29 29...

12 years ago

the two planes cover 580+620=1200 miles per hour. So, they travel for 2700/1200 = 2.25 hrs before meeting. (why?) In that time, the 2nd plane has traveled 2.25*620 = 1395 miles, so it is 1305 miles from LA.

12 years ago

first, I'd get rid of those pesky fractions: 2x + 3y = -1 3x - y = 4 Now you can see that y = 3x-4, so substitute that back in the 1st equation: 2x + 3(3x-4) = -1 2x+9x-12 = -1 11x = 11 x = 1 so, y=3x-4 = -1 be sure to check that the answer fits the origi...

12 years ago

better use shells for this. v = ∫[0,1] 2πrh dx where r = x and h = y = e^(-x^2) v = π∫[0,1] 2xe^(-x^2) dx = π(-e^(-x^2)) [0,1] = π(1 - 1/e)

12 years ago

see construction #2 at http://www.ask-math.com/constructing-triangles.html

12 years ago

figure the final displacement of the ship from the port. Add 180° to get the heading back to port.

12 years ago

do you mean two numbers whose sum is 7? If not, the sum of 7 and what? Finally, you can't divide by two numbers. There is only one divisor. Why not post the question exactly as it was written?

12 years ago

Ah, such carefully contrived angles. Label the point on the ground Q base of the wall A bottom of the window B top of the pole P ∆ABQ is a 30-60-90 ∆, so BQ=20 ∆BPQ is also 30-60-90, so BP=20/√3 so, the pole is 20/√3 = 11.5m

12 years ago

6hr @ S63W = 96@S63W = (-85.53,-43.58) 4hr @ N10E = 64@N10E = (11.11,63.03) add them up to get (-74.42,19.45) = 76.92@N75W So, the bearing of the port on return is S75E. Time to port is 76.92/16 = 4.8 hr

12 years ago

lose the CAPS LOCK, ok? If, as I suspect, you meant (x^6-7x^3-8) / (x+1)(x^2+2x+4) note that x^6-7x^3-8 = (x^3-8)(x^3+1) Now factor those two differences of cubes, ad you have (x-2)(x^2+2x+4)(x+1)(x^2-x+1) / (x+1)(x^2+4) = (x-2)(x^2-x+1)

12 years ago

Factor out 3a^2: 3a^2(1+2x^2-ax) That's about as far as we can go. Now, if you had started out with 3a^4 - 6a^3x + 3a^2x^2, you'd have 3a^2(x-a)^2

12 years ago

taking log₁₀ of both sides, (5-logx^3) logx = log100 (5 - 3logx)logx = 2 for ease of reading let u = logx, so we have (5-3u)u = 2 3u^2 - 5u + 2 = 0 (3u-2)(u-1) = 0 u = 1 or 2/3 so, x = 10^1 = 10, or x = 10^2/3 = ∛100

12 years ago

Let the altitude h from the right angle divide the hypotenuse into two sections x and y, with x<y. By similar triangles, we see that h/x = 2/1 h/y = 1/2 x/y = (h/y)/(h/x) = (1/2)/(2/1) = 1/4

12 years ago

oops. mass = volume*density = 8620.5g

12 years ago

mass = volume/density = (4/3 pi *7^3)/6 = 239.46g

12 years ago

There are 10000-999 4-digit numbers 1/9 of them are multiples of 9.

12 years ago

47-29=18 failed algebra 47-26=21 failed geometry 4 failed both 18+21-4=35 failed something so, 47-35=12 passed both

12 years ago

(1/6 m) * (1/5 m) = 1/30 m^2

12 years ago

Type a^2 for a squared, etc. As written it is not a quadratic.

12 years ago

both points are on a circle of radius a. The distance to the line is the altitude of the triangle formed by the two points and the circle center. Draw the diagram and see the answer checks.

12 years ago

let's see... [(6x-8)-2x]-[(12x-7)-(4x-5)] [6x-8-2x]-[12x-7-4x+5] [4x-8]-[8x-2] 4x-8-8x+2 -8x-6 Unless you have dropped some exponents or mistyped some operators ...

12 years ago

I don't see any way to simplify it. It doesn't factor with integers, there are no common terms. I suppose by specifying as rotation matrix, it could be rewritten as a standard hyperbola on rotated axes, or intersecting lines, but I doubt that's what you h...

12 years ago

actually, just the reverse they are 6/30 5/30 15/30 so, 1/5 1/5 5/10 or, convert to decimal .20 .17 .50, so 1/6 1/5 5/10

12 years ago

what do you mean by "do"? factor? you can use the quadratic formula to get x = (30±√(900+72y^2))/18 = (5±√(25+2y^2))/3

12 years ago

draw a diagram. If the height is h and the closer person is x feet from the base of the obelisk, h/x = tan65° h/(x+25) = tan44° h/(h cot65°+25) = tan44° h = 43.9 ft seems like a small obelisk.

12 years ago

oops. typo. that is 11/6(2a+1), not "1"

12 years ago

1/(4a+2) = 1/2(2a+1) 4/(6a+3) = 4/3(2a+1) Now you have 1/2(2a+1) + 4/3(2a+1) Change it all to be over 6(2a+1): 3/6(2a+1) + 8/6(2a+1) = 1/6(2a+1) How did yo get 14? forget the (2a+1) for now 1/2 + 4/3 = 3/6 + 8/6 = 11/6

12 years ago

how many sides for a square? They are all the same, so . . .

12 years ago

do you just want confirmation of your answer, or do you really have no idea how to solve this? Do you have any problem doing this exercise: 4 out of 6 students were boys. How many were girls? If that's easy, just do the posted problem the same way, changi...

12 years ago

5 1/8 = 4 9/8 1 7/8 = 1 7/8 subtract to get 3 2/8 = 3 1/4 Not sure I'd call this pre-algebra; just 4th grade math to me. Still, I guess all arithmetic is pre-algebra.

12 years ago

ok ok 5 4/5 = 5 + 4/5 6 3/5 = 6 + 3/5 add them up to get 11 7/5 = 12 2/5

12 years ago

3 dimes, 2 nickels

12 years ago

x-x=0, so y = -5 whatever value x has, the equation is still true. You cannot solve for y in terms of x, because y is independent of x in this case. If you have 3=3, then x+3 = x+3 whatever x is. Here, y = -5, so x+y = x-5 whatever x is.

12 years ago

now it looks better. It'd be better if Jordan had 55, but you are correct up to rounding error.

12 years ago

3s+5n = 1790 s = 2n-100 (s,n) = (190,280)

12 years ago

Jordan has as many DVDs as Joseph. is that a typo?

12 years ago

while falling, the apple obeys 2.2 = 10t^2 so it hits the ground after 0.66 sec. To travel horizontally 1.3m in 0.66 sec, it must travel 1.3m/.66s = 1.97m/s Naturally, there is some wiggle room, depending on the size of the basket.

12 years ago

when it is hit. The velocity reverses direction, while it just stops when caught.

12 years ago

225 = 3^2 5^2 so, √225 = 3*5 = 15

12 years ago

I prefer apple.

12 years ago

Hmm. Using Newton's Divided Differences, we get Tn = 1/4 (x^4-6x^3+23x^2-14x+32) Sn = 1/20 x(x^4-5x^3+25x^2+15x+144) Seems a bit complicated for the average induction problem.

12 years ago

what is the probability that you would not roll six sixes

18 years ago

And since that phrase is being used twice, what type of rhetorical device would that be, ive searched but i cant pick which one it is.

17 years ago

anyone? please!

17 years ago

I have a huge test tmr. stuck on this have no idea why? Can anyone help me figure this quadratic equation? PLEASE !

17 years ago

o yes sorry, it is (1/2)^n, so: ∞ Sum((1/2)^n - 10 n=1

17 years ago

I guess that i am saying that n starts at 1 and n goes up to infinite, so how do u put the sum of that?

17 years ago

thankyou! do you know where fishermen overfish?

17 years ago

The answer is 58 5+8

17 years ago

The latent heat of fusion (solid become liquid) for ice is 79.8 cal/gram. How much ice can we melt with 1000 calories of heat

17 years ago

Usually factoring by grouping is useful when patterns jump out at you: x^3 + 3x^2 - 6x - 18 you can see x(x^2-6) + 3(x^2-6) In your problem, that's not likely, so grouping is not a useful method. Instead, factor out the 3x to get 3x(5x^2 - 3x - 2) Now, if...

13 years ago

Can you show your work on how you came to this conclusion?

16 years ago

g(2) = 4(2) + 1 = 9 just substitute the number in perinthases for t.

16 years ago

Compute.

16 years ago

Thanks for being helpful :-)

16 years ago

No its a question on my final tomorrow

16 years ago

Having the same issues!! glad to see all you guys from Penn Foster. I currently work for a hospital and STILL can't get these questions answered... getting frustrating because i only have a few more exams left till I am done (Medical Billing/Coding) For t...

16 years ago

"Atoms make up molecules." So how could number 2 be true?

16 years ago

What shape is the tube? You talk about LxWxH and then ask for circumference. If it's a round tube that fits inside a rectangular (or square) box, then I have to ask, what does the 158cm mean? Volume? Sum of length and circumference? If the latter, then 11...

13 years ago

Do you mean algebraic (signed) area? If so, that is -686/3. If you mean actual physical area, where area below the axis is also considered positive, then you have to break the area into the part above the axis [-1:6] and below the axis [6:13]. Doing it th...

13 years ago

M = Pr/(1-(1+r)^-n) M = (29536*(1-.14))*(.11/12)/(1-(1+.11/12)^(-60)) = 552.28

13 years ago

x-y<=4 does not affect the solution provided by the other three constraints. It's just a triangle with vertices at (1,-1) (1,-1/2) (2,-1)

13 years ago

if x = sinA tanA = x/√(1-x^2) cosA = √(1-x^2) x + x/√(1-x^2) = p x^2/(1-x^2) = (p-x)^2 quartics don't solve simply. If you go to wolframalpha . com and type solve x^2/(1-x^2) = (p-x)^2 you will see a horrendous solution in terms of p. Anyway, pick a solut...

13 years ago

he was deprogrammed.

13 years ago

a parabola reaches its max/min midway between the roots. So, at t = -32/-4 = 8, or 2:00 pm A(8) = 140

13 years ago

(15 5/8)/3 = 15/3 + (5/8)/3 = 5 5/24 or, 15 5/8 = 125/8 divide by 3 125/24 = 5 5/24

13 years ago

consecutive pairs add to 180, so the angles are 120,60,120,60

13 years ago

tanA = 4/9 A = 24°

13 years ago

I assume this is a factoring assignment? 1) (2a-3b)^2 = 4a^2 - 12ab + 9b^2 So, let a=(x-y) and b=(x+y) (2(x-y) - 3(x+y))^2 = (-x-5y)^2 or (x+5y)^2 2) 4p^2 +9q^2 + r^2 - 12pq - 4pr + 6qr 3) (x^3-8)(x^3+8) = (x-2)(x+2)(x^2-2x+4)(x^2+2x+4) 4) x(x^2-1) = x(x-...

13 years ago

reflection changes (x,y) --> (x,-y). So, A(1,2) --> A'(1,-2) etc.

13 years ago

first notice that you can factor out the y, leaving y(y^2-13y+36) Now you want two numbers that add to -13 and multiply to 36. Obviously they must both be negative. Easy factors of 36 are 1,36 2,18 3,12 4,9 It's clear that we want 4 and 9, so our polynomi...

13 years ago

Molarity = mol/L 0.0015/.070 = 0.0214 -log 2.14x10^-2 = 1.67

16 years ago

THe answer is 3

16 years ago

Sorry for number six, the bottom of the first fraction is an x^2 NOT a y^2 very sorry.

16 years ago

Google some book reviews on The Magus, I had a similar assignment last year and the book reviews helped a lot.

16 years ago

Actually, I only need help on parts (b) and (c).

16 years ago

yes i do.

15 years ago

Could you explain why the answer is a?

15 years ago

Thanks! President Kennedy wasn't the "I." Is 4 A?

15 years ago

I know that 1 is not A or D. Is number 4 A?

15 years ago

thanks!

15 years ago

3 or -6

15 years ago

since 16=4^2, log_4 = 2log_16 so, converting all to base 4 logs, log4(2) + 1/2 log4(2) Since 2 = √4, log4(2) = 1/2, and we have 1/2 + 1/2 (1/2) = 1/2 + 1/4 = 3/4 or, looking at it another way, 2 = √4, so log4(2) = 1/2 2 = ∜16, so log16(2) = 1/4 1/2 + 1/4...

12 years ago

It has to pull up with the same amount of force that the other one pulls down. ..while at the same time adding up to a horizontal force of 400N.

15 years ago

equation of a straight line is y=mx+b where m=slope and b is the intercept 20x=4y+9 arrange in form y=mx+b 4y= 20x-9 y= 5x -9/4 m=5=slope

15 years ago

I don't see any fractions there.

13 years ago

seems like a lot of work. mL = 10^-3L kL = 10^3L = 10^6mL cg/kL = g/mL * 100cg/g * 10^6mL/kL = g/mL * 10^8

13 years ago

I'm given the molar ratio of base to acid is 1:1. Does that mean it's monoprotic?

15 years ago

mmoles HCl added= 0.1746 x 75.00mL= 13.095 moles mmles NaOH titrate the excess acid= 27.20 mL x 0.09767 M NaOH= 2.6566 moles But I don't understand how to find the mmoles in 1.3188g. Thanks.

15 years ago

Ok, great. But I'm still confused, sorry. So for No. of moles acid in 25 mL solution: 0.25/0.001418 = 176.3 moles? And for molecular weight of unknown acid? How would you find this.

15 years ago

stupid idiot!!!!

15 years ago

I got it. Thanks a lot!

14 years ago

My thinking: a. Q=(4.18)(237)(50)=49533 J b. Q=(4.18)(237)(70)=69346.2 J c. Q=(4.18)(237)(Tf-95)+(4.18)m(3) + m(334) +cm(Tf)=0 d. Q=(4.18)(237)(-25) + (237)(334) + (4.18)(237)(-3) e. Don't know

14 years ago

How much did a play cost in the late 1800's

14 years ago

2. $0.24 3. $87.60

14 years ago

X=4

14 years ago

Still failing. x=inf or -inf, y=-inf. :-)

13 years ago

2 1/5 hours is 132 minutes. 2 2/5 hours is 144 minutes . . .

13 years ago

Even without doing much figuring, you know that it is near 2. That reduces your choices to B and E. Since you have 16+h, it will naturally be B. Now, the binomial theorem says that (16+h)^1/4 = 16^1/4 + 1/4 * 16^-3/4 * h + ... = 2 + 1/4 * 1/8 * h = 2 + h/...

13 years ago

add 5: 5x > 10x + 11 subtract 10x: -5x > 11 divide by -5: x < -11/5

13 years ago