dave

This page lists questions and answers that were posted by visitors named dave.

Questions

The following questions were asked by visitors named dave.

hi I'm taking sat II lliterature test and i was wondering if you can give me a site where i can take a practice test online for free. Check these sites. http://www.collegeboard.com/student/testing/sat/lc_two/lit/format.html?lit http://testprep.sparknotes....

When a thermometer is placed in a beaker of hot water, WHY does the mercury level DROP, then rise? See my answer below to the same question.

Does a light bulb glow because.... a) there is burning inside b) an electric current glows c) the filament is hot d) a very small current is flowing Wouldn't you think it was because the filament was hot? Of course, a very small current also CAN make a fi...

(2x^2y^-4z^-5)^3 How is the answer 8x^6 _____ y^12z^15

how do you get that answer???

how do I work this? (-4x^12y^7)^2 (2x^-3y^-2)^2 divided by (5x^-3y^10)^-1 i need step by step help

a balloon rises at a rate of 3 meters per second from a point on the ground 30 meters from an observer. find the rate of change of the angle of elevation of the balloon from the observer when the balloon is 30 meters above the ground... so i drew a small...

Hi, I need help on answering this question: To what extent did foreign affairs shape American domestic politics in the 1790s? -- I know about the competing visions between Hamilton and Jefferson as well as the British and the French... But i'm lost. i don...

find the equation of a line tangent to the graph of y = x / (square root of 5x^s +4), at x = 1. am i suppose to take the derivative? if so, then what else?

if f(x) = x^2 - 2x, find f(x+2) - f(2) / 2 the answer is: x+2 but l got: x^2 - 2x - 8 = 0 which is x = 4 or x = -2

how do you find the reference angle of csc,sec, cot? for example: csc theta= 2 times square root of 3 / 2

Calculate the number of coulombs of positive charge in 261 cm3 of (neutral) water. (Hint: A hydrogen atom contains one proton; an oxygen atom contains eight protons.)

(a) What equal positive charges (in Coulombs) would have to be placed on two celestial objects with masses 9.40 x 1027 and 1.99 x 1022 kg to neutralize their gravitational attraction? (b) What mass of hydrogen would be needed to provide the positive charg...

n Fig. 21-41, three identical conducting spheres initially have the following charges: sphere A, 7Q; sphere B, -8Q; and sphere C, 0. Spheres A and B are fixed in place, with a center-to-center separation that is much larger than the spheres. Two experimen...

Why did the South choose to return to a Confederacy despite the failures of this governmental form in the late 18th Century?

t= hours 0 1 3 4 7 8 9 l(t) people 120 156 176 126 150 80 0 concert tickets went on sale at noon (t=0) and were sold out within 9 hours. the number of people waiting in line to purchase tickets at time t is modeled by a twice-differentiable function L for...

how do you detect the presence of co2 in a liquid

draw some quadrilaterals. one fifth is blue. one half is yellow.

lula wants to round 76.24491 to the nearest hundreth. how do you do it?

show that (-1,1), (9,4), (20,6) and (10,1) are the vertices of a rhombus and then find the area of this rhombus?

a compound made in the first part of an experiment, [Co(NH3)5Cl]Cl2 appeared to be a dark brown/orange/purple color. This product was then used as a reactant to synthesize [Co(NH3)5ONO], which was a red color. how do you account for the differences in col...

what is wrong with saying llegamos con mi mama en el aeropuerto? should the en el be del?

does spots mean commercial i have tried dictionaries and online translators none of them know the word

what are the common place copernicum or ununbium are found in

what are place to find the element ununbium or copernicium

When the price of summer tank tops falls and you buy more because they are relatively less expensive, this is called:

When the price of summer tank tops falls and you buy more because they are relatively less expensive, this is called: a)elasticity effect b) deadweight loss effect c) income effect d) substitution effect

how to caculate moles with only molarmass

At what rate must $500 be compounded for it to grow to 1079.46 in 10 years? 8 percent? i think

(Projectile Motion) You are being asked to bombard an enemy fortress that sits on a 40 m tall cliff 100 m from your location. Your cannon has an elevation of 37 degrees. What velocity must your cannonball have to hit the walls of the fortress?

using the quadratic equation on a 2 dimensional projectile motion problem... i am solving for tf and i have it worked all the way down to: -100m(tf)-100m(tf) / -10m/s^2(tf)^2 or -200m(tf) / -10m/s^2(tf)^2 is the answer 20 seconds? algebra is not my strong...

write each decimal as a fraction or mixed number in simplest form 0.78

1570536900 x 3966.848485^-2 =

A committee of 2 teachers and 3 students is to be randomly chosen from a group of 5 teacher and 6 students. the total number of different committees is?

A Ferris wheel has a radius of 15 meters and takes 20 seconds to complete one full revolution. The seat you are riding in, takes 7 seconds to reach the top which is 35 meters above the ground. Write a sine or cosine equation for the height of your seat ab...

a group of hockey officials consists of 6 referees and 5 linesmen. the probability that the youngest referee and linesman would be selected if one referee and two linesman are required is a) 1/15 b)1/30 c) 1/60 d)1/120

what is the probability of a six card hand cantoning no fives?

y-3=1/2(x-6) "finding the value of a variable" x=2 I know the answer is 1, but how do I work the problem to get 1. This problem is in our text book and in the back it states the answer is 1. I tried working the problem serval times and I do not come up wi...

I do not understand a problem from a text book or how to solve the problem for the answer. Could shomeone show me the steps (show work) on how to solve this question. The sum of the intergers from 1 through n is n(n+1)/2. the sum of the squares of the int...

• Find a peer reviewed article which discusses the effects of optimism on physical and psychological health. • Write a 1400 to 1600-word paper summarizing the article and stating your opinion on the validity of the study or studies.

at on time, the velocity of a rifle bullet was measured using a ballistic pendulum made up of a wooden block suspended from a string. the block used here has a mass of 20kg. a 50g rifle bullet is fired into the block, penetrating it by 10cm and causing it...

simplify (e is positive) (24e)^1/3 / (3e)^1/3

In an atom, the maximum number of electrons having the quantum numbers n=5 and §¤ = 3 is: 1. 9. 2. 14. 3. 50. 4. 25. 5. 7. Shouldn't the maximum number be a lot bigger than the answer choices?

For which of these elements would the electron affinity process shown be least favorable? 1. H + e− ! H− 2. Li + e− ! Li− 3. F + e− ! F− 4. O + e− ! O− 5. N + e− ! N−

The first ionization potential of the elements B, C, and N (atomic numbers 5, 6, and 7) steadily increases, but that of O is less than that of N. The best interpretation of the lower value for O is that: 1. the ionization potential of N is a maximum and t...

if the diagonals of quadrilateral ABCD intersect at their midpoints, then the quadrilateral is a parallelogram. Prove that AM MC --- = --- MB MD Ive tried figuring out this question for a while now and I cant figure it out.

A marathon race has 522 runners divided into 6 groups. What is a reasonable number of runners in each group? A 112, because 522/6 is about 550/5=110 B 98, because 522/6 is about 500/5=100 C 87, because 522/6is about 540/6=90 D 82, because 522/6 is about 4...

a baseball team buys 15 bats for $405. aluminum bats cost $25 and wooden bats cost $30. how many of each type did they buy? Please show work

10,000(1-n/20)=6500 please show work

what are the possible coordinate of the midpoint of the given segment

Calculate the mass of salts needed for constructing a buffer using potassium monobasic phosphate and potassium dibasic phosphate with the total concentration of 100 mM. The solution is to be prepared in DI water and the pKa value for potassium monobasic p...

1. Test the Nation on CBC:“Test the Nation” was the biggest survey ever conducted to see just how smart Canadians are. In this live two-hour special, 1.5 million Canadians participated in a real-time interactive IQ test. Viewers took the test in the comfo...

What is the sum of the measures of the interior angles of an 11-side polygon?

The heat of vaporization of a substance is 2900 J/g at its boiling point of 313C. How much of this substance can be vaporized if 58700 J of energy are available?

If a cube has one edge of 2m, what is the surface area of this cube?

An electron in the n = 5 excited state of a hydrogen atom emits a photon of 1281 nm light. To what energy level does the electron move? Any ideas on an equation for this? Is it some kind of backward version of Rydburg Eq?

Consider a red flame color produced by excited lithium with a wavelength of 671 nm. What is the mass equivalent of 1 mol of photons of this wavelength? I can get as far as Js of E Can't seem to find equation to turn Js into mols, or photons into mols, for...

please help me with thisone thanks solve the inequality algebraically. Express the solution in interval notation. (x-8)^2/x^2-36 > 0

If a pogo stick was to be reinvented and you were to choose the spring type. What type of spring will generate the most return of kinetic energy compared to least amount of force needed to compress the spring...you can use leaf, coil, scissor, compression...

What transportation vessel and animal are on the family crest of the McDonalds of Scotland ? (Mr. G's ancestors)

The midpoint of mc is G. If AT = 42 and AG = 2x – 5, what is x?

A figure skater is warming up on the rink. She does a lap of a 100m rink. She completes the laps in 3 minutes. What was her speed?

can u help me with this rhyme? small parts of wild plants it's dealing with possessive nouns

MS Word Quiz. "Browse Headings" in the Nav Pane organizes your document into a .... Answer a. heirarchy b. picture c. print preview d. keyword search

Pleaseee help explain how to draw the free body diagrams for this problem!!! Two blocks with masses m1 = 10.9 kg and m2 = 79.3 kg, shown in the figure (in the figure the 79.3kg block(m2) is on a flat surface, the 10.9kg(m1) block is pinned against the blo...

A 64.2-kg skier coasts up a snow-covered hill that makes an angle of 23.8° with the horizontal. The initial speed of the skier is 7.18 m/s. After coasting 1.96 m up the slope, the skier has a speed of 3.13 m/s. Calculate the work done by the kinetic frict...

a .65 kg ball is attached to the end of a string. it is swung in a vertical circle with a radius of .50 m. at the top of the circle its velocity is 2.8 m/s.

Which of the following sentences contains a verb in the simple past tense? A. I was working overtime for about six months. B. We helped Joan to pack her things. C. She would like to join us. D. Jenna has driven this route multiple times.

If end A of the rope moves downward with a speed if 5 m/s, determine the speed of cylinder b

4(3.75^1/64-1)=r

An object is dropped from a height of 12m.At what height is the rock kinetic energy and its potential energy be equal?

if a man walked 1/12th of a mile one day 2/12ths of a mile the next day and 3/12ths of a mile the next day on what day did he walk a complete mile

A random sample of size 36 is taken from a population with mean 50 and standard deviation 5. Find P( < 51.5).

What is Jones Act (maritime area)?

divide and simplify (y^3-3y)/(y^2-9)divided by (y^2-7y-30)/(y^2+6y+9) Please help!

If landlord is charging .50 per ft for 26,100 sq ft warehouse, what is the lease amount

Ann is driving down a street at 58 km/h. Suddenly a child runs into the street. If it takes Ann 0.778 s to react and apply the brakes, how far will she have moved before she begins to slow down?

if 15 grams of iron combines with 6.5 grams of oxygen, how much rust is formed

solve quadratic equation x2 + x + (sqrt 3/4)i = 0 complex roots

f(x) = 2 x^3 - 24 x^2 + 90 x + 14 is increasing.

how much heat enrgy must be taken in 24 gram of water to reduce the temperature of 7 degrres celcius

A pool designed for lap swimming is rectangular in shape with a uniform depth of 4.5 feet. If the pool is enlarged so that it holds twice as much water, which of the following statements could be true?

If a can of ravioli with a diameter of 2 inches and a height of 4.5 inches holds 12 ounces of ravioli, how many ounces of ravioli would a can with the same height, but double the diameter, hold?

Anna builds a rectangular prism storage container with dimensions of 8 inches by 6 inches by 12 inches. She builds a second container with a greater volume by increasing the dimensions of the rectangular prism to 16 inches by 12 inches by 24 inches. How w...

Two vectors have magnitudes of 3 units and 8 units respectively. The resultant of these two vectors has a magnitude of 8 units. What is the angle between these two vectors?

A 6.75-g sample of gold (specific heat capacity = 0.130 J/g °C) is heated using 55.8 J of energy. If the original temperature of the gold is 25.0°C, what is its final temperature?

Calculate the equilibrium constant for the following reaction at room temperature, 25 ∘C: N2(g)+O2(g)→2NO(g)

2CH3CH2CH2OH(l)+9O2(g)→6CO2(g)+8H2O(g) I have to find the delta G delta G of CH3CH2CH2OH(l)=−360.5 KJ/Mol delta G of O2(g)=0 KJ/Mol delta G of CO2(g)=−394.4 KJ/Mol delta G of H20(g)=−228.6 KJ/Mol I keep getting -3426.2 KJ/Mol but its not correct.

Four long, parallel conductors carry equal currents of I = 9.50 A. The current direction of the current is into the page at points A and B and out of the page at C and D. Calculate the magnitude and direction of the magnetic field at point P, located at t...

A farmer wants to construct a pen with 100 feet fencing. The pen will be divided into two areas. Find the dimensions of the big pen. You may use your calculator or the fact that the x-coordinate of the vertex of a parabola is x=-b/2a. I would like to show...

I'm a bit confused on the whole lesson on finding coordinates on a graph. With prime or double Prime, and with the shapes. if some can explain it to me in a easier way, that would be cool. Thanks! (sorry if I didn't explain my problem well enough)

Iron and oxygen gas can react to form the magnetic oxide of iron Fe3O4. How many grams of Fe3O4 can be made from 13.2 g of O2?

A real estate agent makes 4.5% commission on every property she sells. How much commission does she make on a sale of a house for $132,500.00? Don't understand how to do the problem. Can you help me? Thank you

A man walks 5.0m due east and then 10.0m N30oE . Find his resultant displacement

Consider the equation f(x)= -2 sqrt(X+3). List in order the transformations applied to the parent function.

5 inches is what fraction of a foot? A. 1/3 B. 1/2 C. 5/12 D.5/24 my answer is C. is it correct?

on office equipment sales representative earns a weekly salary and commission on his sales. one week his total compensation on sales of $7000 was $700, the next week his total compensation on sales of $8000 was $740, find the weekly salary and commission...

a sheet of 8 x 4 ply how many sheets to cover 13ft 6 x 13 ft

Determine the mass of oxygen in a 7.2-g sample of Al2(SO4)3

A dike in Holland springs a leak through a hole of area 0.80 cm2 at a depth of 1.2 m below the water surface. How much force must a boy apply to the hole with his thumb to stop the leak?

Answers

The following answers were posted by visitors named dave.

dude, this problem is impossible

thanks but i'm still lost...

wait, i mistyped. it should be: if f(x) = x^2 - 2x, find f(x+2) - f(2) / x divided by x, not 2. sorry...

well i redid it and i got this: = x^2 + 4x + 4 - 2x - 4 - 2^2 - 4 / 2 = x^2 + 2x / x divide the x and i get "x+2" is it correct??

It takes someone with a really big heart to give to our charity, and you seem like someone who cares more than most

i need question 9 and 11 also volcanoes is 4 and tsunami is 12

how do you solve linears

I can not believe the amount of errors on this page with spelling etc. There is no problems getting jobs as long as you know your stuff. People usually gripe about the school because they cant handle not having a teacher around. If you are self-paced and...

Le gouvernement a décidé de programmer à nouveau ces spots sur les chaînes de radio et télé, accompagnés d'autres recommedations.

a 5 b 3 c 7 d 38

i want to know what is the common place this element is found in

thank you very much.. i understand what you are saying, but can you show me the algebra steps to get the 2 solutions? i keep substituting the first equation into the second and try to work it out, but for some reason i am still doing it wrong.

my variables are a little different than yours, but here is what i have.. Yf=Vosinθ (tf)-.5g(tf)² Yf=Vosinθ(xf)/Vocosθ-.5g(xf/Vocosθ)² i'm having trouble isolating Vo. am i supposed to use the quadratic equation? my algebra is not very good.. so if you ca...

ahhh i finally got it!!! thank you so much!

yes.. it's the "brothers of mercy" problem. a plane is flying at 40 m/s, descending at an angle of 37 degrees to the horizontal. it is 100 m in the air and it is trying to drop a package to a man at R distance. what is R? to find R, i needed to solve for...

How did the views of the Whigs and Democrats differ from those in the Free-soil Party?

how do i mutipli fractoins

Thank you Reiny. I see where I was making my mistake. I was multiplying 1/2*2 and 1/2*-6. instead of 2-6 then multiplying 1/2. Thank you for your help.

No need to shout Jen. I misunderstood her question. I would like help finding an article that is peer reviewed that pertains to my original question. I have searched my university's library and cannot find any related articles.

That weird symbol was supposed to be quantum number l.

*******Prove that AM/BM = MC/MD

I should have given more info. I figured that I would use the H-H equation and the total conc., but what I don't get is why do I need two pka's. I can get to the mass easily, but it seems that I could use either pka=7.21 or 12.67 with the base +acid =.1M.

(1)acid+base=.1M potassium dibasic phosphate: 7=12.67 + log(base/acid) (base/acid)=2.138x10^-6 subst. in (1) base+base/2.138x10^-6=.1 solving base=2.13x10^-7M Mass of base=2.13x10^-7 x (174.18g)=3.71x10^-5g Now I can find the mass of the acid as well by s...

actually the other guy has it right except that he has sin instead of cosine

correct. can be written as just 9s^2 - 4d^2

let x be ttl $ spent (2.75 * days) y=110-x

You have two problems here. 1. need D:f(x) = 2sqrtx 2. subsitute x=4 into derivative D: 2sqrtx : a) multiply power times coefficient; 1/2 * 2 = 1 b)power - 1 = 1/2 -1 = -1/2 c. f'(x) = x^-1/2 or 1/sqrtx substitute 4 for x and you should be there

an infinity of shapes can have two right angles provided they have more than three sides and the sum of the inside facing angles minus the sum of the outside facing angles equals 180 degrees.

h*c/lambda would this be planck's constant times speed of light / wavelength?

y-(-4)= 5/2(x-3)-b this should be slope intercept FORM of what you wrote.

ahh, of course, thank you.

1 * 10^-3 = .001 1 * 10^-4 = .0001 1 * 10^-5 = .00001 Get the Idea?

The experiment was not 'double blind" because the same person who compared the test scores (the professor) was aware of the reason for the experiment. If the groups were aware of the reason for them playing the games (possible affect on test scores) this...

The additive inverse is the # which when added to a number equals zero. interesting questions. If you consider 12 on the clock to be '0", the -3 would have 3 as an "AI". If you consider the number you are starting from to be "0" then = or - 12 would alway...

for every increase of 1 in x, y decreeases by 3 this gives us 3x y=0=23 so, y=23-3x

do a search for maps of the world / lat /long

replace n with inf. 1 + (-1^0/0) = 1 +(-1^0) = 1+1= 2

equal, opposite

The additive inverse is the # which when added to a number equals zero. If you consider 12 on the clock to be '0", the -3 and 9 would both have 3 as an "AI"

check out law of cosines

I would shy away from first person unless specifically to write from that perspective.

if two sides must be parallel then the fourth side is also 3.5 cm add the sides = perimeter

1km = 1000 m 100cm = 1 m convert to meters and divide

hi, don't know the answer, i didn't even go to college.... i am trying to invent a device that will aid in handicapped sports... i am trying to load a spring with the least amount of energy and compound it into the highest kinetic force i can.. only thing...

Okay, dude your velocities are ridiculous, does 150 m/s even make ANY sense to you?

P= r - c p= (5000-30x)(80+x)-300x p'= -60x + 2300 x = 38.3 therefore 38.3 * 30 = 1150 per person

A figure skater is warming up on the rink. She does a lap of a 100m rink. She completes the laps in 3 minutes. What was her speed? Answer a. 33.3 m/min b. 300 m/min c. 66.7 m/min my answer b. ?????

small parts of wild plants

the incompetent bullfighter was by gordan bluddy.

Part / whole =percent. 24/120=.20=20% 36/120=.30=30% 54/120=.45=45% 6/120=.05=5%

I got it. 3.75^(1/64)=1.020867172-1=.02086712*4= 0.08346868=8% this is on the TI84 Calculator

Review the annual reports for PepsiCo, Inc. and The Coca-Cola Company in Appendixes A & B, especially the Consolidated Statements of Income and the Balance Sheets on pp. A4, A6, B1, & B2 of Financial Accounting.

The diameter of small Nerf balls manufactured at a factory in China is expected to be approximately normally distributed with a mean of 5.2 inches and a standard deviation of .08 inch. Suppose a random sample of 20 balls is selected. Find the interval tha...

We can find that there are three topics that may generate high costs, which can make inefficient use of large-scale wind energy: - The purchase and set-up of wind turbines can be expensive - Wind turbines require certain constant speeds to be productive -...

ok does anyone know how to do this i need step by step help on this

i got 88.6 degree celcius is it right?

A bag contains 4 purple, 3 blue and 2 red cubes. Select 3 cubes and stack on table next to the bag. What is probability of the cubes being red, purple then blue

delta Gf for NO(g) is 87.6 kJ/mol delta Gf for both O2 and N2 gas is zero

Delta Gf= -RT*ln(K) R is 8.314 T is 298

Running through I got the answer 1.97x10^-31 but it is telling me I am wrong.

Oh it sums up the heat? I thought it was delta G(products)-Delta G(reactants) wouldn't that then be 8*-228.6 + 6*-394.4-2*(-360.5)= giving you -3426.2 KJ/Mol. Could you explain why you made the 360.5 positive? Thanks.

I am doing this assignment for mastering chemistry and It just keeps telling me that it is wrong, I have no idea what the issue is.

A. diphtheria. B. deadly epidemics. C. heart disease. D. influenza.

steve is .1 off but its 44.62

8. In Frost’s poem “Mending Wall,” the lines “I see him there, / Bringing a stone grasped firmly by the top / In each hand, like an old-stone savage armed” uses which poetic device?

every one sucks at giving answers especially those blondes

Holy bals this is hard

depends on the sequence

the figure at right is a sguere. find an xepression for the area of the shaded region . write yuor answer in standard form.

write the expression for the perimeter of the pond

A dike in Holland springs a leak through a hole of area 0.80 cm2 at a depth of 1.2 m below the water surface. How much force must a boy apply to the hole with his thumb to stop the leak?

I cant find the exact answer from above 3 answers.

A hat contains 37 marbles. Of them, 14 are red and 23 are green. If one marble is randomly selected out of this hat, what is the probability that this marble is red?