Jon

Combustion analysis of a 1.00g sample of ascorbic acid yields 1.500g of CO2 and 0.409g of H2O. What is the empirical formula of ascorbic acid? (a. CHO B.CH2O C. C2H4O2 D. C3H4O3 E.Cannot be determined with the information given. ) Convert the 1.5 g of CO2...

20 years ago

Whats the net ionic equation for the decomposition of hydrogen peroxide (H202)? I know that it decomposes into water and O2 but is H202->H20+O2 the net ionic or does the H2 and O2 split up to be H2 + O2 -> H20+O2 and if so is the net ionic then just H2->H...

20 years ago

Suppose the price elasticity of demand for heating oil is 0.2 in the short run and 0.7 in the long run. c. If the price of heating oil rises from $1.80 to $2.20 per gallon, what happens to the quantity of heating oil demanded in the short run? In the long...

19 years ago

2. You have a sugar solution (solution A) with concentration x. You pour one-fourth of this solution into a beaker, and add an equivalent volume of water (solution B). a) What is the ratio of sugar in solutions A and B? b) Compare the volumes of soutions...

18 years ago

Calculate the hydronium ion consentration and the hydroxide concentration in blood in which the PH is 7.3. Hydronium = [H3O+] = 10-pH or [H3O+] = antilog (- pH) and I got 1.00 x 10^7.3 for both concentrations is this correct? ABsolutely silly. You did not...

18 years ago

this makes absolutley no sense I plug all this into my calculator but I get different results. The hydronium ion concentration can be found from the pH by the reverse of the mathematical operation employed to find the pH. [H3O+] = 10-pH or [H3O+] = antilo...

18 years ago

Organized interests often provide useful,specialized and detailed information to the government for example,on employment,price levels, or the sale of new and existing homes.These data are important to the making of public policy,and government officials...

18 years ago

what are three main goals sought by policymakers in the economy? please help me one of my posts has a question I need checked and the other I don't know. I don't know what you guys are thinking.I really need help im not some kid on here scrapping for answ...

18 years ago

I don't understand how this is if (a ± b)² = a² ± 2ab + b² i would think that is would be A squared plus or minues B squared where does the 2ab come from??

18 years ago

Suppose I have developed a system for removing carbon dioxide, from the emissions of combustion process. But this process is expensive so that it would not be instantly adopted by all countries. I have to choose a country to start up this business. can yo...

18 years ago

Does anybody know about Miele Domestic Appliances? Its a German manufacturer of domestic appliances, I need to know why they are so successful in the marketplace, and what threats does they face. I went to thier websites but they didn't have such informat...

18 years ago

Calculate the Magnitude of the resultant of a pair of 100-km/h velocity vectors that are at right angles to each other.

18 years ago

Write a function for the surface are of a cylindrical cans (12 oz) in terms of the radius. Show your work (no height in this function) Graph of the function found and label the x and y axis with an appropriate scale.

18 years ago

Yeah, so I'm in urgent need of help with this homework. 1. Assume that in a perfectly competitive market, a firm's costs and revenue are: Marginal cost = average variable cost at $20 Marginal cost = average total cost at $30 Marginal cost = average revenu...

17 years ago

Find the equation of the tangent line and the normal line to the graph of the equation at the indicated point. x^2-y^2=16, (5,3) I need to show work, so answers formatted in this manner would be most appreciated. Thanks! :) :)

17 years ago

A rotating beacon is located 1 kilometer off a straight shoreline. If the beacon rotates at a rate of 3 revolutions per minute, how fast (in kilometers per hour) does the beam of light appear to be moving to a viewer who is 1/2 kilometer down the shorelin...

17 years ago

Use a symbolic differentiation utility to find the derivative of the function g(x)=xã((x^2)+1). Use the utility to graph the function and is derivative on the same set of coordinate axes. Describe the behavior of the function that corresponds to any zero...

17 years ago

A small aircraft starts its descent from an altitude of 1 mile, 4 miles west of the runway. a) Find the cubic f(x) = ax3 + bx2 + cx + d on the interval [-4,0] that describes a smooth glide path for the landing. b) If the glide path of the plane is describ...

17 years ago

A section of highway connecting two hillsides with grades of 6% and 4% is to be build between two points that are separated by a horizontal distance of 2000 feet. At the point where the two hillsides come together, there is a 50-foot difference in elevati...

17 years ago

Hi I need someone to check my answers I'll show whatever work I have but for time purposes I'll just post my answers because I think I have most of them correct. Thanks! 1)Find the 20th term of the arithmetic sequence in which a1=3 and d=7. A)143 B)136 C)...

17 years ago

1)Find a1 in a geometric series for which Sn=300,r=-3,and n=4 A)15 B)15/2 C)-15 D)1/15 I chose A 2)Find the sum of the infinite geometric series. Sigma sign with infinity symbol above and n=1 below. To the right 20(-1/4)n-1 A)25 B)80/3 C16 D)does not exis...

17 years ago

1)Find a1 in a geometric series for which Sn=300,r=-3,and n=4 A)15 B)15/2 C)-15 D)1/15 I chose A 5)Find the fifth term of the sequence in which a1=-3,and aN+1=3aN-n A)-301 B)-99 C)-193 D)-341 I don't know

17 years ago

1)Find the third iterate x3 of f(x)=x2-4 for an initial value of x0=2 A)-4 B)4 C)12 D)-12 I chose C 2)Use Pascal's triangle to expand:(w-x)5 This ones long so I chose w5-5w4x+10w3x3-10w2x4+5wx4-x5 3)Use the binomial Theorem to find the third term in the e...

17 years ago

In an induction proof of the statement 4+7+10+...+(3n-1)=n(3n+5)/2 the first step is to show that the statement is true for some integers n. Note:3(1)+1=1[3(1)+5]/2 is true. Select the steps required to complete the proof. A)Show that the statement is tru...

17 years ago

an ice cream store has 31 flavors of ice cream and 10 toppings. A regular sundae has one flavor of ice cream, one topping, and comes with or without whipped cream. How many different ice cream sundaes can be ordered? I'm thinking 310 but how do i figure i...

17 years ago

ATTENTION TEACHERS AND HELPERS I Am THE REAL Jon I'm not changing my name to greg,jonathan or anything else whenever you see Jon,not jon its me I always give my best answer. I don't just ask questions waiting for someone to give me the answer. Thanks and...

17 years ago

Describe the system 6x-2y=10 and 9x-3y=8 as consistent and independent, consistent and dependent, or inconsistent. Explain. I don't know how to do this one

17 years ago

A furniture company displays bedroom sets which require 21 square meters of space and living room sets which require 42 square meters of space. The company which has 546 square meters of available space,wants to display at least 6 bedroom sets and at leas...

17 years ago

What does the word keen mean in australian?

17 years ago

How do you turn 5/16 into a decimal?

17 years ago

is baked chicken healthier than grilled chicken?

17 years ago

How would I translate the sentence "it was good that the water was not cold?" into French? Would I need to use the subjunctive? Merci

17 years ago

1)An ice cream store has 31 flavors of ice cream and 10 toppings. A regular sundae has 1 flavor of ice cream, 1 topping, and comes with or without whipped cream. How many different ice cream sundaes can be ordered? A)310 B)372 C)620 D)82 I chose C 2)How m...

17 years ago

1)Two marbles are chosen at random from a bag containing 3 blue and 2 red marbles. The relative-frequency histogram shows the distribution of the number of red marbles chosen. Find P(0 red). (the gragh shows 3/10 for 0 red, 3/5 for 1 red, and 1/10 for 2 r...

17 years ago

Age 0-14 number of people= 206,423 Age 15-34 number of people= 265,778 Age 35-54 number of people= 308,946 Age 55-74 number of people= 159,092 Age over 74 number of people= 69,264 1)Classify the data in the table. A)positively skewed B)negatively skewed C...

17 years ago

2)For 2000 patients, a blood-clotting time was normally distributed with a mean of 8 seconds and a standard deviation of 3 seconds. What percent had blood-clotting times between 5 and 11 seconds? A)68% B)34% C)49/5% D)47/5% I chose A 4)A music teacher wan...

17 years ago

Find the value of Sec A. and I have a right triangle BC=30 and BA=34 A)17/8 B)9/17 C)15/17 D)17/15 I chose D

17 years ago

1)I have a right triangle. the hypotenuse is 7 the opposite leg is x and an angle is 32. Which equation can be used to find x? A)sin32=x/7 B)cot32=7/x C)tan32=x/7 D)cos32=x/7 I chose D 2)A right triangle 26 is the hypotenuse,opposite leg is 15. Find A to...

17 years ago

1)Which angle is coterminal with a -400 degree angle in standard postion? A)40 B)80 C)320 D)400 I chose A (for the next one I don't know what its called but it looks like 0 with a horizontal line through the middle.) 2)Find the exact value of cos looks li...

17 years ago

1)Find the exact value of cot(-315) A)1 B)square root of 2 C)square root of 2 over 2 D)2 I chose C 2)Find the exact value of sin(-pi/6) A)-1/2 B)-square root of 3/2 C)-square root of 2/2 D)square root of 2/2 I chose A 3)In triangle ABC, C=30, c=22, and b=...

17 years ago

1)In triangle ABC, C=60 degrees, a=12, and b=5. Find c. A)109.0 B)10.4 C)11.8 D)15.1 I chose B 2)Which triangle should be solved by beginning with the Law of Cosines? A)A=115 degrees, a=19, b=13 B)A=62 degrees, B=15 degrees, b=10 C)B=48 degrees, a=22, b=5...

17 years ago

1)Write the equation sin y= x in the form of an inverse function. A)y=Sin-1x B)x=Sin-1y C)y=sin-1x D)y=Sinx I chose A 2)Solve y=Arcsin1/2 A)-5pi/6 B)5pi/6 C)-pi/6 D)pi/6 I chose D 3)Find the value of Sin-1(-1/2) A)-30 degrees B)30 degrees C)150 degrees D)...

17 years ago

1)Find the amplitude of y=6cos4theta A)3/2 B)6 C)4 D)pi/2 I chose B 2)Find the period of y=tan5theta A)10pi B)2pi/5 C)5pi D)pi/5 I chose D 3)Find the phase shift of y=sin(theta-3pi/4). A)3pi/4 B)-3pi/4 C)4pi/3 D)-4pi/3 I chose A 4)Find the vertical shift...

17 years ago

1)Find cos theta if sin theta=3/5 and 90 degrees<theta<180 degrees. A)4/5 B)-4/5 C)square root of 34/5 D)-square root of 34/5 I chose A 2)Simplify:1-csc^2theta/cot^2theta A)-1 B)1 C)tan^2theta D)1/sin^4theta I chose C 3)Simplify:-5(cot^2theta-csc^2theta)...

17 years ago

First of all I would like to thank everyone for helping me. The reason that I post my questions like I do is b/c they are multiple choice and all I'm looking for is to know if my answer is correct or not. If its not right then I would go back and try to s...

17 years ago

There are no typos and no work b/c I don't know how to do them. Thanks. 1)Find cos theta if sin theta=3/5 and 90 degrees<theta<180 degrees. A)4/5 B)-4/5 C)square root of 34/5 D)-square root of 34/5 I chose A 2)Simplify:1-csc^2theta/cot^2theta A)-1 B)1 C)t...

17 years ago

Which expression is equivalent to tan theta-sec theta/sin theta? A)-cot theta B)cot theta C)tan theta-cot theta D)tan theta-sec^2theta just tell me what I need to know to set it up

17 years ago

1)Find the exact value of cos 105 by using a half-angle formula. A)sqrt 2 - sqrt 3 /2 B)-sqrt 2 - sqrt 3 /2 C)-sqrt 2 + sqrt 3 /2 D)sqrt 2 + sqrt 3 /2 cos 105 cos 105 = cos 210/2 sqrt 1 + 210/2 sqrt 1 + sqrt 3/2 /2 sqrt 2 + sqrt 3/2 which is D 2)Find the...

17 years ago

2)Find the solution of sin2 theta = cos theta if 0 -< theta < 180 A)30 degrees and 90 degrees B)30 degrees and 150 degrees C)30 degrees, 90 degrees, 150 degrees D)0 degrees, 90 degrees, and 150 degrees sin2 theta = cos theta sin2 theta - 1 = 0 (sin theta...

17 years ago

Which expression equivalent to: cos(theta + pi/2). A)cos theta B)-cos theta C)sin theta D)-sin theta my book doesnt give examples of this but my crack at it would be C b/c distributive property? and 2cos theta = sin theta

17 years ago

Find the exact value of sin2(theta) if cos(theta) = -sqrt 5/3 and 180 < theta < 270. A)-1/9 B)-4 sqrt 5/9 C)1/9 D)4 sqrt 5/9 B? sin^2(theta) + cos^2(theta) = 1 sin^2(theta) = 1 - cos^2(theta) sin^2(theta) = 1 - (sqrt 5/3)^2 sin^2(theta) = 1 - (sqrt 25/9)

17 years ago

Find the exact value of sinx/2 if cosx = 2/3 and 270 < x < 360. A)1/3 B)-1/3 C)sqrt 6/6 D)-sqrt 6/6 C, since I KNOW cosx is always positive but I don't know the work involved. I know the half angle formula

17 years ago

1)Find x in the solution of the system 3x+y=2 and 2x-3y=16 A)2 B)-4 C)18/11 D)10/11 I chose A 3x+y=2 times 3 = 9x+3y=6 2x-3y=16 times 1 = 2x-3y=16 11x/11 = 22/11x = 2 2)Find the coordinates of the vertices of the figures formed by y -< x + 2, x + 2 -< 6,...

17 years ago

The five fastest roller coasters in the world Fujiyama(Japan), Goliath(CA), Millenium Force(OH), Steel Dragon 2000(Japan), and Superman the Escape(CA). The speeds, in mph, of the first four coasters are 83,85,92,and 95, respectively. How fast can Superman...

17 years ago

Write an equation of the line that passes through (9,6) and is perpendicular to the line whose equation is y = -1/3x +7 y-y1=m(x-x1) y-6=3(x-9) y-6=3x-27 y=3x-21

17 years ago

if the average speed of ALL 5 coasters is no more than 91 mph then that last coaster has to be 100 mph to reach a speed of 91 on average. if superman goes at 99 then the average would be only 90.8 if it's at 100, the average would be 91 exactly

17 years ago

Find the coordinates of the vertices of the figures formed by y -< x + 2, x + 2 -< 6, and y >- -2 A)(0,0),(2,4),(8,-2) B)(-4,-2),(2,4),(8,-2) C)(-4,-2),(4,2),(8,-2) D)(-2,-4),(2,4),(8,-2) I chose B this one confused me this is all the work to show: -2 -<...

17 years ago

Solve the matrix equation 2x + 5y = 1 x + 3y = 0 for y. A)1 B)3 C)-3 D)-1 I chose D 2x + 5y = 1 y = 5 - 2x x + 3(5 - 2x)= 0 x + 15 - 6x = 0 7x = 15 x = 15/7 I know that's wrong I don't know what to do

17 years ago

The vertices of ABC are A(-3,-4),B(-1,3),C(3,-2). The triangle is rotated 90 degrees counterclockwise. Use the rotation matrix [0 -1][1 0] to find the coordinates of C' A)(-3,2) B)(4,-3) C)(-3,-1) D)(2,3) I chose A [0 -1] x [-3 -1 3][-4 3 -2] =

17 years ago

Simplify y^2 + y - 20/y^2 - 2y - 8 A)y - 5/y - 2 B)y + 5/y + 2 C)5/2 D)y - 10/y - 4 I chose A. I don't know how to do it.

17 years ago

Simplify: (1+i)/(2-i) A)(1/3)+(2/3i) B)(1/5)+(2/5i) C)(1/3)+(i) D)(1/5)+(3/5i) I have no clue please explain

17 years ago

Find the exact solution to 6x^2+1=-8x by using the Quadratic Formula. A)-4+-(sqrt10) B)-4+-(sqrt22)/6 C)-2+-2(sqrt10)/3 D)-4+-(sqrt10)/6 I chose C x=-b+-(sqrtb^2-4ac)/2a x=--8+-(sqrt-8^2-4(6)(1))/2(6) x=8+-(sqrt64-24)/12 x=8+-(sqrt40)/12 x= C

17 years ago

Which describes the number and type of roots of the equation x^2-625=0? A)1 real root, 1 imaginary root B)2 real roots, 2 imaginary roots C)2 real roots D)4 real roots I went with A sqrt x^2= x (which would be the imaginary) and sqrt 625= 25 (the real)

17 years ago

If g(x)= 3x-8, find g[g(-4)]. A)-68 B)4 C)-20 D)52 I got C 3x-8[3x-8(-4)] 3x-8+3x+32 thats all I have

17 years ago

Write an equation for an ellipse if the endpoints of the major axis are at (-8,1) and (8,1) and the endpoints of the minor axis are at (0,-1) and (0,3). d= sqrt(x2-x1)^2 +(y1-y2)^2 d= sqrt(8--8)^2 + (1-1)^2 d= sqrt 16 + 0 d= sqrt 256 d= 16

17 years ago

Find the exact solution(s) of the system: x^2/4-y^2=1 and x=y^2+1 A)(4,sqrt3),(4,-sqrt3),(-4,sqrt3),(-4,-sqrt3) B)(4,sqrt3),(-4,sqrt3) C)(2,1),(2,-1),(4,sqrt3),(4,-sqrt3) D)(4,sqrt3),(4,-sqrt3) I don't know

17 years ago

Simplify: (4m/5n^2)-(n/2m) A)(8m^2-5n^3)/10n^2m B)(8m^2+5n^3)/10n^2m C)(4m-n)/(5n^2-2m) D)2/5n^2 I chose C 4m/5n^2 - n/2m 4m/5(n)^2 - n/2(m) C

17 years ago

1)If y varies inversely as x and y = 3, when x = 6. Find y when x = 36. A)72 B)2 C)1/2 D)18 I chose C y1/x2 = y2/x1 3/36 = y2/6 18/36 = 1/2 2)Write the equation 4^-3 = 1/64 in logarithmic form. A)log64 = 4^3 B)log^-3 64 = 4 C)log^4 1/64 = -3 D)log^4(-3) =...

17 years ago

1)Find the sum of the infinite geometric series: 1 + 3/5 + 9/25 + ..., if it exists. A)5/3 B)5/2 C)3/5 D)does not exist I chose B (3/5)/1 = .6 S = a1/1-r 1/1-.6 2.5 2)Use the Binomial Theorem to find the sixth term in the expansion of (m+2p)^7. A)21m^2p^5...

17 years ago

1)A bookshelf holds 4 mysteries, 3 biograpghies, 1 book of poetry, and 2 reference books. If a book is selected at random from the shelf, find the probability that the book selected is a biography or reference book. A)1/2 B)1/6 C)5/6 D)3/50 I chose A 5 bi...

17 years ago

1)Find the standard deviation of the data set to the nearest tenth. (21,13,18,16,13,35,12,8,15) A)16.8 B)7.8 C)7.3 D)5.7 I chose C mean = 21+13+18+16+13+35+12+8+15/9 16.8 variance = (21-16.8)^2 = 17.64...did that with the rest and added them to get sqrt 5...

17 years ago

1)Find the value of 7+2(5-2*3^2) 7+2(5-2*9) 7+2(5-18) 7+2(-13) 7+-26 (answer)-19 2)Name the sets of numbers to which 457 belongs. (answer)natural,whole,integers,rational,reals

17 years ago

1)The sum of a number and 17 more than twice the same number is 101. Find the number. 17+2n=101 17-17 101-17 2n=84 n=42(answer) 2)Evaluate: 5-/a+5b/ if a=-12 and b=2. 5-/-12+5(2)/ 5-/-12+10/ 5-/-2/ 5-2 3(answer)

17 years ago

2)Name the sets of numbers to which 457 belongs. (answer)natural,whole,integers,rational,reals My book says that every REAL number has to be rational or irrational. Blueridge said that my answer was correct except to exclude rational from my list. From wh...

17 years ago

1)Solve 3+2(1-x)>6 or 2x+14<=8. Graph the solution set on a number line. The number line I'm working with is: -4 -3 -2 -1 0 1 First solution: 3+2-2x>6 5-2x>6 -2x>1 x> -1/2 for the graph, I have an open circle between 0 and 1 and the arrow going right. Sec...

17 years ago

( / means absolute value) Solve: 3+/2y-1/>=1. Graph the solution set on a number line. The number line I have is: -5 -4 -3 -2 -1 0 1 2 3 4 5 6 First solution: 3+2y-1>=1 2y-4>=1 2y>=5 y>=5/2 I'm stuck b/c I had to correct the first part. I had a whole diff...

17 years ago

( / means absolute value) Solve: 3+/2y-1/>=1. Graph the solution set on a number line. The number line I have is: -5 -4 -3 -2 -1 0 1 2 3 4 5 6 I'm confused on what to do.

17 years ago

If f(x)= 5x^2-4/x, findf(4) 5(4)^2-4/4 5(16)-4/4 80-4/4 76/4 19(answer)

17 years ago

Write an equation in slope-intercept form for the line that passes through (3,5) and (-2,1). y2-y1/x2-x1 1-5/-2-3 -4/-5= slope y=mx+b y=-4/-5(3)+b -2=2.4+b -4.4= y-intercept y= -4/-5x+4.4 (answer)

17 years ago

Write an equation for the line that passes through (0,7) and is perpendicular to the line whose equation is y=1/2x-1. y-y1=m(x-x1) y-7=2/1(x-0) y-7=2x-0 y=2x+7(answer)

17 years ago

Evaluate h(-2/3)if h(x)=[[x-2]]. [[-2/3-2]] [[-2.67]] 2.67(answer)

17 years ago

Solve the system of equations: First:4x-2y=2 Second:y=-4x-7 4x-2(-4x-7)=2 4x+8x+14=2 12x+14=2 subtract 14 from both sides x=-1 y=-4(-1)-7 y=4-7 y=-3 (-1,-3)

17 years ago

Solve the system of equations: First:x+3y=5 Second:3x-y=5 multiply the second equation by 3 then add both equations(I know I have it wrong somewhere I just guessed at the solution and it worked. I got (2,1)

17 years ago

(This is the info for the question NOT the actual question) A furniture company displays bedroom sets which require 21 square meters of space and living room sets which require 42 square meters of space. The company, which has 546 square meters of avalibl...

17 years ago

Triangle DEF with vertices D(2,5),E(1,-6), and F(-5,3) is translated 3 units right and 2 units down. Find the coordinates of D'E'F'. I added the x coordinates by 3 and added the y coordinates by -2 and got: D(5,3),E(4,-8),F(-2,1)

17 years ago

Evaluate:|12 5 -2| |-3 0 1| |-5 4 2| It's going to be really confusing if I post my work. I got -127 from all the confusing things I did

17 years ago

Use Cramer's Rule to solve: 3x-5y=21 and 4x+2y=2. a=3, b=-5, c=4, d=2, e=21, f=2 21(2)-(-5)(2) divided by 3(2)-(-5)(4) =52/26= x=2 3(2)-21(4) divided by 3(2)-(-5)(4) =78/26= y=3 answer: (2,3)

17 years ago

Solve the matrix equation: |4 -5||m|=|32| |1 2||n|=|-5| I don't get it

17 years ago

what are Gregor Mednel's two greatest impacts on modern times.

17 years ago

My book doesn't solve it like a linear equation, they solve it by using inverse matrices. Solve the matrix equation: |4 -5||m|=|32| |1 2| |n|=|-5| A= |4 -5| |1 2| X= |m| |n| B= |32| |-5| Step 1. Find the inverse of the coefficient matrix. A^-1= 1/13|2 5|...

17 years ago

Assume that no denomenator equals 0. (7x^2+3x-9)-(-x^2+8x-3) = 7x^2+3x-9+x^2-8x+3 = (7x^2+x^2)+(3x-8x)+(-9+3) = 8x^2+-5x+-6 = 8x^2-5x-6(answer)

17 years ago

Assume that no denominator equals 0. 5x^3(7x)^2 = 5*7*7+x^3+x^2 = 245x^5(answer)

17 years ago

Assume that no denominator equals 0. (2x-3)^2 = 2x * 2x -3 * -3 = 4x-9(answer)

17 years ago

Assume that no denominator equals 0. (8y^3+27)/(2xy-10y+3x-15) I don't know how to solve this one.

17 years ago

Assume that no denominator equals 0. sqrt 16x^2y^4 = sqrt (4x)y^2 = 4xy^2(answer)

17 years ago

Assume that no denominator equals 0. sqrt12 - sqrt18 + 3sqrt50 + sqrt75 = (sqrt2^2*3) - (sqrt2*3^2) + (3sqrt2*5^2) + (sqrt3*5^2) = (sqrt2^2*sqrt3) - (sqrt3^2*sqrt2) + (3sqrt5^2*sqrt2) + (sqrt5^2*sqrt3) = (2*sqrt3) - (3*sqrt2) + (3sqrt5*sqrt2) + (5*sqrt3)...

17 years ago

Assume that no denominator equals 0. 2+i/1-3i = 2+i/1-3i = (2+i/1-3i) * (1+3i/1+3i) = (2+3i^2)/(1-9i^2) = (2/1) - (1/3i) = 2-1/3i(answer)

17 years ago

Use synthetic division to find (2x^3 - 5x^2 + 7x - 1). _1|2 -5 7 -1 2 -3 _____________ 2 -3 4|-1 2x^2 - 3x + 4(answer)

17 years ago

Write the expression m^7/9 in radical form. 9sqrt m^7 (answer)

17 years ago

Solve: sqrt3x+6 + 4 =< 7 sqrt3x+6 + 4 =< 7 subtract 4 from both sides sqrt3x+6 =< 3 subtract 6 from both sides 3x/3x =< -3x/3x x =< -1 (answer)

17 years ago

A) Decrease B) Increase C) Indeterminate D) decrease

18 years ago

Thanks so much! :) You're a lifesaver!

17 years ago

Gee, now you're going to make people who open this topic think the answer has already been provided. Thanks a ton...

17 years ago

Sorry, that's x times square root of ((x^2)+1)

17 years ago

Sorry, that's f(x) = ax^3 + bx^2 + cx + d

17 years ago

ok thanks. Did you check the others?

17 years ago

yeah for #2 i did pick D sorry for the typo

17 years ago

thanks for the help. are you possitive they are correct?

17 years ago

Im homeschooled its algebra II

17 years ago

1)Find the third iterate x3 of f(x)=x2-4 for an initial value of x0=2 thats how it is in my book 2)the choices are: A)w^5-4w^4x+6w^3x^2-6w^2x^3+4wx^4-x^5 B)w^5+5w^w-10^3x^2+10w^2x^3-5wx^4+x^5 C)w^5+4w^4x-6w^3x^2+6w^2x^3-4wx^4+x D)w5-5w4x+10w3x3-10w2x4+5wx...

17 years ago

So its D? I don't understand

17 years ago

no im not its a multiple choice question

17 years ago

thanks i got it

17 years ago

so its 620

17 years ago

This is fairly easy just use alittle more effort and someone will check your answer.

17 years ago

Yeah I'm the one where drwls help last. I just don't want yall to think I'm the bad guy.

17 years ago

the 2nd equation equals the 1st so there are many solutions to the system so its consistent and dependent.

17 years ago

no that's all my book says

17 years ago

Thanks!! Its right!

17 years ago

thanks for the help. none were wild guesses

17 years ago

I don't understand what you said for #5 but its either C or D.

17 years ago

I'm sorry #2 says For 2000 patients, a blood-clotting time was normally distributed with a mean of 8 seconds and a standard deviation of 3 seconds. What percent had blood-clotting times between 5 and 11 seconds? Is #4 A?

17 years ago

BA is the hypotenuse BC is the opposite leg

17 years ago

the only diff is c has sin-1x and a has Sin-1x

17 years ago

how is 2 not A? my book says to solve an oblique triangle: two angles and any side, and two sides and an angle opposite one of them is solved by Law of Sines. Two angles and their included angle or three sides are solved by Law of Cosines.

17 years ago

its just the capital S in A and lowercase s in C

17 years ago

I don't know that's just what it says in my book.

17 years ago

are the rest ok?

17 years ago

I have been showing my work in my book but not for these questions b/c I have no clue as to how to solve them its just I need them to be checked and its just too time consuming to post the work on the computer. I really appreciate everyone's help.

17 years ago

Thank you

17 years ago

I don't know what im doing on these I don't even know where to begin. The whole thing is confusing

17 years ago

I have one: 1)Find cos theta if sin theta=3/5 and 90 degrees<theta<180 degrees. A)4/5 B)-4/5 C)square root of 34/5 D)-square root of 34/5 I chose A cos^2theta+sin^2theta=1 cos^2theta=1-sin^2theta cos^2theta=1-(3/5)^2 cos^2theta=1-9/25 cos^2theta=16/25 =4/...

17 years ago

#6)cos 375 = cos(60+45) = cos 60 cos 45 - sin 60 sin 45 = 1/2 x sqrt 2/2 - sqrt 3/2 x sqrt 2/2 = sqrt 2 -sqrt 6/4 which is C? If so, I understand how we got it. Thank you for helping me

17 years ago

in my book its the same problem except its -3/5 and in my question its 3/5, so that would mean the final answer is 4/5 instead of -4/5 right?

17 years ago

drwls, Thursday, February 14, 2008 at 5:24pm Surely you meant to write cos 375 = cos 15 = cos (60 - 45) No, I meant to write +

17 years ago

thats how the formula is in my book but I see where you're coming from

17 years ago

trig identities are like in a different language for me. can I please get at least 1 step to get started. I looked at all the sites about it but if I don't understand what im looking at it does no good, I know how to read I just don't get it.

17 years ago

I understand that a little thank you sooo much for explaining it.

17 years ago

my question is sin 2è = cos è NOT sin2 è = cos è. I'm sorry, I didn't understand your question earlier.

17 years ago

mode is the one that occurs most often so for this set the mode is 9

17 years ago

I really thought I had that one. My 1st thought was D but I figured since sqrt 5/3 was negative then so would my final answer.

17 years ago

No

17 years ago

Thank you. It wasn't really a guess it was either C or D and then I just knew it was positive so that just leaves C.

17 years ago

that WAS my work. those 4 lines my choices are: A)y=-1/3x+9 B)y=-3x+33 C)y=3x-21 D)y=1/3x+3

17 years ago

if the average speed of ALL 5 coasters is no more than 91 mph then that last coaster has to be 100 mph to reach a speed of 91 on average. if superman goes at 99 then the average would be only 90.8

17 years ago

if it's at 100, the average would be 91 exactly

17 years ago

ok im stuck after this: y = x + 2 x + y = 6 y = -2

17 years ago

No, all are not true

17 years ago

The rest says: Assume that the denominator is not equal to zero. Everything else is correct

17 years ago

I see where the confusion was sorry and thank you.

17 years ago

google: music written polyphonically is called. and look at the wikapedia selection. hope that helps.

17 years ago

So C would be the choice?

17 years ago

Oh yeah duh. my mistake

17 years ago

I made it harder than it was thanks. But I just thought that x was imaginary

17 years ago

Please explain x = [-8 +-sqrt (64-24)]/12 =[-8 +-sqrt(4*10)]/12

17 years ago

I did all the steps

17 years ago

i don't understand

17 years ago

the brackets confused me

17 years ago

Right? PLEASE say yes

17 years ago

No. why would I not just take the number of bio and ref. and divide by the total number of books?

17 years ago

Discard this post

17 years ago

/ is suppose to be absolute value

17 years ago

I thought so. Thank you

17 years ago

Where did you get negative 2??

17 years ago

exactly. I don't know what they mean but that's how it reads.

17 years ago

Ok, we lmow that the slope is 4/5. y=mx+b y=4/5(3)+b -2=2.4+b subtract 2.4 from both sides -4.4 which is how I got the y-intercept y= 4/5x+4.4 13/5 = 2.6 not 4.4

17 years ago

I have to show my work so is that ALL I have to do? 3+ ©¦2y-1©¦ ¡Ý 1 or ©¦2y-1©¦ ¡Ý -2

17 years ago

thats not how they solve it in my book. the steps are to find the inverse of the coefficient matrix then multiply each side of the matrix by the inverse matrix

17 years ago

A= |4 -5| |1 2| X= |m| |n| B= |32| |-5|

17 years ago

yes I do

17 years ago

(7x^2+3x-9)-(-x^2+8x-3) is the question. the rest is my work

17 years ago

yes

17 years ago

wouldn't it be 4x^2 + 12x + 9?

17 years ago

ok I was thinking about multiplication

17 years ago

Use synthetic division to find (2x^3 - 5x^2 + 7x-1)/(x - 1)

17 years ago

I think radical sign is what I meant. I don't know what its called its just not a sqrt sign but it looks like one.

17 years ago

I thought I had to put them in like ordered pairs.

17 years ago

What do you mean?

17 years ago

no that's the only way I know how to do it.

17 years ago

y=2x+3^2-5 y=2x+9-5 x=-b/2a x=-9/2(-9) x=1/2 I don't know if I have the value for a right

17 years ago

vertex= (3,-5) axis of symmetry= x=2 direction= up b/c 2>0

17 years ago

I don't understand what you did after the 1st line.

17 years ago

-x^4-102x^2+200=0 (-x^2)^2-102(x^2)+200=0 I'm stuck at this point

17 years ago

They are looking for just 1 right? how would I go about showng my work?

17 years ago

never mind I got it

17 years ago

I think I got it. I'll have my answer shortly

17 years ago

Ok I have all my work down in the space but I have a spot that says: Answer_________ What do they want me to put in that spot. I know "the answer" duh but I have all the steps and my work above that and I don't know what the "answer" is I don't want to do...

17 years ago

so 5040 ways? that's a lot

17 years ago

no how about this P(at least 2 women)= P(exactly 2 women)+P(exactly 3 women)= {(6!/(1!*5!))*(4!/(2!*2!))+ (4!/(3!*1!)}/{10!/(3!*7!)}= 40/120=1/3 answer = 1/3

17 years ago

30/52?

17 years ago

go to synonym. com and search detail

17 years ago

I know I need to use the law of sines but I don't really know how and which one to use like sinA/a= sin B/b and sinB/b =sinC/c and sinA/a = sinC/c. That's where I get confused.

17 years ago

I get the work part of it but for this question is it one solution or two?

17 years ago

b=9.7(i had to round) im not sure if im doing this right. SinB/b = SinC/c Sin38/9.7 = Sin86/c c = 9.7sin38/sin86 c= 5.98 or 6 since I have to round to nearest tenth.

17 years ago

so to find c all I have to do is Sin56/13 = Sin86/c c = 13Sin56/Sin86 c = 10.8

17 years ago

7)I got 1.08 x 10^1 km

17 years ago

has to be in scientific notation

17 years ago

2.52 for #10

17 years ago

9)I multiplied total distance 85 miles times total time of 70 min. and got 1.21 mi/hr

17 years ago

I divided of course

17 years ago