Thursday
July 24, 2014

Search: Calculus - not sure if my work is correct?

Number of results: 54,923

Calculus
(x^3+1)^2 then dy/dx i got 6x^2(x^3+1), not sure if it is correct.
March 24, 2010 by Anonymous

Calculus - not sure if my work is correct?
A 15ft ladder leans against a building and its base starts to slide down the wall. The base is moving at a rate of 5ft/sec when the base is 9ft from the wall. How fast is the top of the ladder moving at this moment? What is the rate of change of the angle formed by the ladder ...
February 12, 2011 by Amy

Physics: Work
1st question: I was solving a question and I was asked the work done by friction. It is natural that work done by friction (a retarding force)should be negative and in my answer it was. However, just to be sure, work can be negative? 2nd question: A block of m = 2.00kg is ...
March 12, 2007 by Matt

Calculus
Differentiate. y= u(a cos u + b cot u) I am not sure if this correct. I was not sure whether to leave the variables as are or where the negatives should be placed? (u)*(- a sin u - b csc^2 u) + (a cos u + b cot u)*(1)
October 24, 2010 by CMM

Calculus
3^2/3^4 I did this through my calulate and I came up with 1/9, but that is not the correct answer. I'm not sure what to do?
March 24, 2009 by Avery

calculus help work
a force of 1250 pounds compresses a spring 5 inches from its natural length. find the work done in compressing the spring 8 additional inches. f=kd 1250=k5 k=250 then what do i do. i have to do this the calculus way, not the physics way. by using integrals the answer choices ...
January 8, 2007 by david

Calculus
Does my answer look correct? Find the derivative. 11, y= (e^3-e)(e+5)/6e my work: ((6e)(4e^3 + 15e^2 - 2e - 5) - (6)(e^4 + 5e^3 - e^2 - 5e))/ (6e)^2 Multiplied/divided everything through My answer: (10e^2 + 30e - 3)/ 18 I cant follow your work: I assume e is a derivative. (e^3...
December 19, 2006 by Alexandra

Calculus
let f(x)=x^3(e^-x) Answer using calculus, use graphing calculator only to check work. a) Find the local and global extrema of f. b) Find the intervals where f is increasing/decreasing. c) Find the inflection points of f. d) Find the intervals where f is concave up/down. e) ...
April 17, 2011 by Janet

9th Grade Math
Hey, I finished my math homework, and im not so sure i did it correct, so can someone do this question and i will look at the answer to see if my work was correct this is State and Justification Given : m<4 = 130degrees, m<1 = x+10 , and m<2 = x Prove : m<1 = ...
December 2, 2008 by Victor

MATH HELP
The amount of fill (weight of contents) put into a glass jar of spaghetti sauce is normally distributed with mean = 843 grams and standard deviation of = 9 grams (d) Find the mean of the x distribution. (Give your answer correct to the nearest whole number.) 843 Was my ...
June 19, 2013 by TOM7

Calculus
I finished this problem but I wanted some feedback because I don't know if it's entirely correct. Suppose that functions f and g and their derivatives with respect to x have the following values at x=2. f(x)=8 g(x)=2 f'(x)=1/3 g'(x)=-3 Find d/dx of f(g(x)) at x=2. I know the ...
April 1, 2009 by Lauren

calculus
1)A function g is defined for all real numbers and has the following property: g(a+b) - g(a) = 4ab+2b2 find g'(x) A)4 B)-4 C)2x^2 D)4x E)does not exist not so sure where to start 2)If d/dx[f(x)] = g(x) and d/dx[g(x)] = f(3x, then d^2/dx^2 [f(x^2)] is A)4x^2 f(3x^2) + 2g(x^2) B...
November 15, 2012 by Kevin

Algebra
1. √(9y - 196) + √196 = √49 My work: I squared all 3 roots and got 9y - 196 + 196 = 49 The - 196 + 196 cancels out and we are left with 9y = 49. divide 49 by 9. = 49/9. I'm pretty sure this is wrong. Can you show me where I messed up? 2. √x(√9 - 4...
March 11, 2014 by Student

physics
my answer for these are 1. a 2.c 3 d but not sure so please anyone see if i am correct 1. In which of the following cases is work done on the object? A. Lifting an object off the floor. B. Pushing an object, but it does not move C. Carrying an object at a constant velocity D. ...
November 6, 2011 by jasmine

Maths (Calculus)
A current i = 50sin 100πt mA flows in an electrical circuit. Determine, using integral calculus, its a) Mean Value b) RMS Value each correct to 2 decimal places over the range t = 0 to t = 10 ms I need to do this two way so I was thinking of using the trapezoidal rule and...
May 5, 2013 by Dylan James

Calculus
[Linear Approximations and Differentials] I tripled checked my work but I'm still not getting the correct answer. y=3x^2 x=3 & delta x =0.2 I get 3(3.2)^2 - 3(3) = 21.72
September 27, 2009 by Z32

Calculus
An airplane flies at an altitude of 5 miles toward a point directly over an observer. The speed of the plane is 600 mi/hr. Find the rate at which the angle of elevation is changing when the angle is 30 degrees. I found the answer to be 60 radians/hr by taking the derivative of...
November 19, 2009 by Katie

Math
I'm trying to perform the indicated operations, and reduce to lowest terms, but I'm not sure if I got the correct answer. The question is y-5/(x^2+5x)+(xy+5y) + 1/x+y - 2/x+5....I got y-6, but am not sure if that is correct.
March 23, 2010 by Matt O.

Calculus
The area bounded between the line y=x+4 and the quadratic function y=(x^2)-2x. Hint: Draw the region and find the intersection of the two graphs. Add and subtract areas until the appropriate area is found. I found the intersection points as (-1,3) and (4,8). I'm not sure what ...
May 9, 2011 by Janet

Calculus
Let R be the region bounded by the curve x=9y-y^2 and the y- axis. Find the volume of the solid resulting from revolving R about the line y= -6. I believe the integral limits are from y=0 to y-9 i set up h(x) = 9y-y^2 r(x) = y+6 I am not sure if this is correct Can anyone help...
December 4, 2013 by Salome

Calculus
Could someone please check my work on the following problems? I want to be sure that I'm doing them correctly; i'm just required to find the derivatives and then simplify. g(t)= t/sint g'(t)=1*sint-cost*t/(sint)^2 g'(t)=sint-cost*t/(sint)^2 y=ln(e^ax) y'=1/e^ax*e^x*a and i'm ...
October 19, 2008 by Joesph

PRE CALCULUS
V = x(16-2x)(19-2x) = 175 ft Ok, thanks. Now I'm trying to multiply out and having some difficulty. I am getting 4x^3-70x^2+304x = 175 which I'm not sure how to work with
September 6, 2009 by Ash

algebra
factor: 9w - w^3 = 3w(3-w^2) m^4 - n^4 = (m-n)^2(m-n)^2 are these correct? the next few I wasn't sure how to work... factor: 2h^2 - h - 3 = 0 x^2 - 36 = 0 x^3 = 4x
January 24, 2009 by kayla

statistics/probability
how many green elements are required to make a legitimate probability distribution if there is a total of 50 elements in this sample? x red blue orange brown green p(x) 0.10 0.10 0.10 0.20 ? * i am not sure but i don't think that any green elements are required but i am not ...
October 23, 2010 by mary- please check calculations.

Calculus
If a rock is thrown upward on the planet Mars with a velocity of 10 m/s, its height in meters t seconds later is given by y = 10t - 1.86t^2 a) Find the average velocity over the given time in intervals: (i) [1,2] (ii) [1,1.5] (iii) [1,1.1] (iv) [1,1.01] (v) [1,1.001] Do I just...
September 25, 2010 by CMM

math-calculus
30/x^2-25 = 3/x-5-2/x+5 i be left with 30 = 3x^2-75-2x^2+50 i not sure what to do? i use the quadratic formula? math-calculus - Steve, Saturday, January 7, 2012 at 3:38pm First, you have to simplify properly: 30/(x^2-25) = 3/(x-5) - 2/(x+5) 30 = 3(x+5) - 2(x-5) You were ok ...
January 7, 2012 by Shreya

calculus-answer check
Determine the slope of the tangent line to the curve y=(x^2+3x)(x^2-2) at x=-1. I got 3 as my answer although I am not too sure that it's correct. I found the derivative of the function and then substituted -1 into the equation.
May 9, 2014 by Kim

calculus(work)
a rectangular water tank has a length 20 ft, width 10 ft , and depth 15 ft . if the tank is full , how much work does it take to pump all the water out (using calculus)?
April 2, 2011 by tony

Calculus
Find the solution of the logarithmic equation: ln(x+8)+ln(x8)=0 Im not sure how to approach this one. I tried moving the ln(x-8) to the other side and solving for x and that did not work. I also tried putting everything as an exponent to e. please help! thanks
October 29, 2010 by Adam

Physics
Consider the following four possibilities for two point charges and choose the one(s) that do not change the magnitude of the electrostatic force that each charge exerts on the other: A. Double the magnitude of each charge and double the separation between them. B. Double the ...
July 18, 2012 by Patrick

Calculus
f(x)=5+(6/x)+(7/x^2), find f'(x). I haven't done fractions without using the quotient rule im not so sure this would work with quotient rule what do i do?
April 29, 2008 by John

Calculus 2
Calculus work problem. John bought the following corner lot. Two sides are bounded by 2 roads the back is bounded by a stream that follows the curve y = -x^3 + 8. He wants to build a house in the center of the lot. Where will that be? Please show all work
September 27, 2012 by Laura

math- commutative property
My daughter had this question for Hw and wasn't sure the correct answer. the expression was (4 7/8 +3 3/4)+5 1/8 which shows another way to write the expression using only the commutative property of addition A) 4 7/8+(3 3/4 +5 1/8) B)(5 1/8 +4 7/8) +3 3/4 C) 3 3/4 +4 7/8) + 5...
January 9, 2014 by Lis

Math please help!!
Solve the system using substitution. y = -2x + 5 3y = -x - 5 I already got the answer, just wanna make sure it's correct. Please show work as well.
February 28, 2011 by Melanie

Math [Calculus]
I'm asked to find the volume of the solid bounded by the curves x=1+y^2 and y=x-3, rotated about the y-axis. I have a general idea of how to start the problem off, but I'm not sure how to find the interval that I need to work with...
January 10, 2010 by Tii

Calculus - please check my work
differentiate each function a) y = cos^3x b) y = sin(x^3) c) y = sin^2 xcos3x my answers: a) y' = 3cos^2 x(-sinx) b) y' = cos(x^3)(3x^2) c) for this one, i dont know which one is correct. i got 2 different answers but i think they may be the same.. im not sure, i did it twice ...
June 19, 2012 by Henry

Algebra II-Please check fpr explanation
I have a question concerning this problem:I just want to make sure my formulas are correct before I do problem It is a hyperbola equation (y-4)^2/49 - (x-6)^2/72 = 1 1.It is a vertical hyperbola, correct? 2. the a^2 is 49, correct? 3. the b^2 is 72, correct? 4. I find the foci...
January 14, 2012 by Graham

calculus
The point on the curve for y = sqrt(2x+1) at which tangent is perpendicular to the line y = -3x + 6 is.... a. (4, 3) b. (0,1) c. (1, sqrt3) d. (4, -3) e. (2, sqrt 5) I'm not sure, but do you find the perpendicular slope (1/3) set that as dy/dx and solve for x or y? I tried ...
January 24, 2012 by Hanna

Calculus
If 6 J of work is needed to stretch a spring from 10cm to 12 cm and another 10 J is needed to stretch it from 12 cm to 14cm, what is the natural length of the spring? This is a physics problem as much as a calculus one. Solve for the spring constant k first, then determine ...
October 10, 2006 by Shayn

Pre-Calculus
If you solve the following system of equations by substitution, which statement is true? x = z x - 2y + z = 6 2x + y - 2z = 1 A. You can substitute z for x into the second and third equations. B. You can substitute x for z into the second and third equations. C. Both methods ...
January 22, 2013 by Caroline

spanish
Are these sentences correct? 1. Usted debe poder a Hector un libro. 2. Mi amigo que si yo dan a hector. ** I am not sure if a or something else goes before Hector in sentence 1 ** I am not sure if dan a Hector is correct in snetence 2
October 22, 2007 by sam

Trigo!
Ok, i did this maths trigo question, that says sinx-cos=2/3. I squared it on both sides to get sin2x=5/9 and did the sum. In the end i got two solutions, 16.9 and 73.1. However, when i substituted the answers back into the equation, only one of the 2 answers was correct! The ...
September 19, 2009 by help!

Chem 2
What is the molar solubility of copper(II) carbonate at 25 oC in a solution that is 0.055 M in copper(II) chloride? I have done one and I am not sure I am doing it correct. If you can show your work for myself to understand. That would be awesome. Thank You!!
October 30, 2011 by Maegan G

Chemistry - Ideal Gas Law
You have a weather balloon that is filled with Helium (He) and has a diameter of 3 ft. Find the mass in grams of the He in the balloon at 21 degrees Celsius and normal pressure. And the density of He with these conditions is .166 g/L. My Work: V=4/3 * pi * r^3 V = 14.1 ft^3...
May 1, 2010 by Black Reaper

calculus
i have to integrate using u substitution, but i am not sure if i did it correct. tan^3(5x)sec^2(5x)dx u=5x du=5dx 1/5du=dx 1/5tan^3(u)sec^2(u)du 1/5tanusec^2u+c 1/5tan(5x)sec^2(5x)+c
March 29, 2009 by Devon

Calculus
Can someone look over my work and tell me if my steps look correct? I'm trying to correct some problems that looked wrong. Instructions: Find the total areas between the given curves. 1. x= (y^3) and x=(y^2) on the interval [0,1] (integral from 0 to 1 of) ((y^3)-(y^2))dy = (...
September 10, 2009 by Jenna

Calculus - please check my work
Differentiate each function a) y = -3x^2 + 5x - 4 b) f(x) = 6/x - 3/(x^2) c) f(x) = (3x^2 - 4x)(x^3 + 1) the answers i got for each was: a) y'= -6x + 5 b) f'(x)= -6/x^2 + 6/x^3 c) f'(x)= 15x^4 + 6x - 16x^3 - 4 please double check and let me know if these are correct, thank you.
June 18, 2012 by Henry

Calculus - please check my work
evaluate rounding to 2 decimal places if neccessary a) 1n5 = 1.61 b) lne^2 = 2 c) (lne)^2 = 1 please let me know if these are correct, thank you.
June 18, 2012 by Henry

To Wyatt re English 101
I don't like leaving that entire test available online, so I'll post my response to you here: 1 - 31 are correct. Incorrect = 32 33 and 34 are correct, but they sure are clumsy, aren't they? 35 is odd -- your second sentence implies that baseball (what? the ball? the game?) ...
September 4, 2013 by Writeacher

Math: Vectors
I forgot how to do the following, so I'm not sure if they're correct or not: Find the work done by a force "F" that causes a displacement "d". i and j = unit vectors a) F = 4i + j d = 3i + 10j W = (4i + j)(3i + 10j) W = 12|i|^2 + 40ij + 3ij + 10|j|^2 W = 12(1) + 40(0) + 3(0...
February 24, 2008 by Anonymous

Grammar
1.Which of the following sentences have (unreduced) compound clauses? Briefly explain your answer. a.I like cities with parks and public sculptures. b.Everyday he either burns the toast or overcooks the eggs. c.Neither does he drink nor does he swear. d.Chris keeps calling Pat...
April 7, 2009 by Nora

algebra
Not sure if I have the correct answer dealing with inequalities and not having equal signs. so the problem is 3x+4>9x+2 I came up with 2/6>x? not sure so this why I'm asking
February 4, 2011 by SO LOST

chemistry
Lab on Determining hard water Not sure if I answered this currently, not completely sure how to explain either. If a student has a non-zero blank correction, but forgets to include that correction in his/her calculations:? a. Would his/her calculated [EDTA] be correct, too ...
January 17, 2013 by Ahmad

chemistry
Lab on Determining hard water Not sure if I answered this currently, not completely sure how to explain either. If a student has a non-zero blank correction, but forgets to include that correction in his/her calculations:? a. Would his/her calculated [EDTA] be correct, too ...
January 18, 2013 by Ahmad

Chemistry - check answers
Can someone please check my answers and make sure they're correct? A) How much heat would it take to raise the temperature of 46.0 g of water from 90.0 to 100.0 C? Answer using correct sig figs, sign, and units. My answer: +1.92x10^3 J B) How many joules are released when 84.0...
February 23, 2014 by Amanda

science-important!
I really need to make sure this is correct for tommorow please help! The significance of specific base pairing in DNA is that A) it stabilizes the sugar molecule B) it provides a method for making exact copies of DNA C) it prevents errors in DNA replication D)protein copies ...
November 19, 2011 by jake

science-important!
I really need to make sure this is correct for tommorow please help! The significance of specific base pairing in DNA is that A) it stabilizes the sugar molecule B) it provides a method for making exact copies of DNA C) it prevents errors in DNA replication D)protein copies ...
November 19, 2011 by jake

Pre-Calculus
Which sets of ordered pairs represent functions from A to B? Explain. A = {a, b, c} and B = {0, 1, 2, 3} A. {(a, 1), (c, 2), (c, 3), (b, 3)} B. {(a, 1), (b, 2), (c, 3)} C. {(1, a), (0, a), (2, c), (3, b)} D. {(c, 0), (b, 0), (a, 3)} I narrowed it down to either B or C, but I'm...
August 9, 2012 by Peter

Physics
Five moles of an ideal gas are compressed isothermally from A to B, as the graph illustrates. What is the work involved if the temperature of the gas is 351 K? Be sure to include the correct algebraic sign. I did 8.31x351x5 but the answer is wrong... any help is much ...
December 1, 2011 by Jasmin

Lang. Arts
Which pronoun correctly completes the sentence? I am not sure who is following us, but it might be ___? A.him B.she C.their I know "him" sounds correct...but I just needed to be sure...??
May 2, 2013 by Cassie

6th grade grammar please help
I need a good grade in grammar so please check my answers! Identify the object of the preposition in each of the following sentences. 1. Ashley and her father arrived home from work. a. and b . father c. from d. work 2. Ashleys bedroom was across the hall. a. bedroom b. was c...
April 30, 2013 by Jade

math,correction
is this correct? simplify: ((1+(2)/(3))/((2+(1)/(2)) My answer: (2)/(3) assuming that 2/3 and 1/2 are separate fractions, 8/3 x 5/2 40/6 20/3 hmm.. perhaps you need to check your arithmetic. unless i'm wrong, which wouldn't be surprising It is hard to read because the ()'s are...
April 20, 2007 by jasmine20

calculus
Consider the solid obtained by rotating the region bounded by the given curves about the x-axis. y = 9 - 9x^2 , y = 0 Find the volume V of this solid. Sketch the region, the solid, and a typical disk or washer. Any help or tips would be greatly appreciated; not sure how to ...
March 8, 2011 by Tina

Math
Find the domain of the function sqrt(4-x^2). I tried it not sure if i'm correct 4-x^2>= 0 -x^2>=-4 x^2<=4 x<=2,x>=-2 Am I correct?
November 7, 2010 by Jamie

math help
Consider the approximately normal population of heights of male college students with mean = 69 inches and standard deviation of = 4.6 inches. A random sample of 25 heights is obtained (e) Find P(x > 70). (Give your answer correct to four decimal places.) (f) Find P(x &...
June 16, 2013 by Sue 7

intermediate algebraDivide
Essay: Show all work. A gardener wants to create a rectangular garden with length of 2x-3y ft. and width of x+4y ft. What is an algebraic expression for the area of the garden? Be sure to multiply this out, express in simplest correct mathematical form, and include units.
July 18, 2011 by sheba

Chemistry(Please check)
Last question, I just want to make sure I understand the concept of hybridization. For carboxylic acid the hybridization is: CH3= sp3 because there are only single bonds COOH= Sp2 because the oxygen is double bonded to the C Is this correct? Thank you for checking my work!
September 12, 2012 by Hannah

Math
^=exponents /= divide So I am not sure how to do this. It is an example in my book but I still dont get it. Can you work through ti so I can do my real work. (-1^2+-1^-2)^-1 [(-1)^2+(-1)^-2)]^-1 = [1 + 1/(-1)^2]^-1 = (1 + 1)^-1 = 1/2
November 23, 2006 by Gina

Science-Repost
I just want to make sure if I'm correct; does this look correct to you? When all of the hydrogen of the Sun is used up, it will turn into a red giant. Is red giant correct?
March 23, 2010 by Sara

calculus
The integral of 3x^2 - 4x + 1 equals x^3 - 2x^2 + x. Is this always correct? Where is the constant of interation? wouldn't x^3 - 2x^2 + x + 23 also be correct?
March 31, 2007 by kelly

Elements of Structures MIT 2.02
This is my last chance and I need to see if my calculus is correct. Is it correct ? Q2_2_4 vA=-5.82 cm ??
July 27, 2013 by ElementarySchoolStudent

Physics
you lift a 10 N physics book up in the air a distance of 1m at a constant velocity of .5m/s. What is the work done by the weight of the book? a) +10 J b)-10 J c) +5 J d)-5 J 10 N is the force of gravity and to find work you do this: W=F_g(change in distance) (10N)(1m)= +10J so...
October 10, 2007 by Tammy

intermediate algebra
Essay.Show all work. A gardener wants to create a rectangular garden with the length of 3x-2y ft. and the width of 3x-3y ft. What is an algebraic expression for the area of the garden.Be sure to multiply this out.Express in the simpliest correct mathematical form and include ...
April 11, 2012 by Lueshelle

ALGEBRA
not sure if this answer is correct frustrated find the reciprocal of 5 3/4 i think its 4/23 doesn't seem like i did the formula the correct way
January 15, 2011 by So Lost

Chemistry
Hi Dr.Bob, Which is the correct formula for dinitrobis(ethylenediamine)cobalt(III) nitrate? I'm not sure which is the correct one out of these two: a)[Co(en)2(NO2)2]NO3 or b)[Co(NO2)2(en)2]3(NO3)3 ? At the instance, I've choosen option a). Is my naming correct?
May 13, 2012 by Meenaakshi

Drama Question
Creative drama offers a means for cooperative learning and teamwork through which? 1. shared experiences 2. creative illustrations 3. building language skills 4. improvised facial expressions I am thinking "shared experiences" offer a means of cooperative learning and teamwork...
April 1, 2007 by Bobbie

(2-8) Chemistry - Science (Dr. Bob222)
Which of the following statements is correct? A) The internal energy of a system increases when more work is done by the system than the heat that flows into the system. B) The system does work on the surroundings when an ideal gas expands against a constant external pressure...
May 11, 2014 by Ana

pre-algebra
a woman jogging at 6 mph passes a man biking the in opposite direction at 12 mph. If they maintain there speed, how far from each other will they be 10 minutes after passing? I tried 12 divided by 10 + 6 divided by 10 = 1.8 but I am not sure if that answer is correct... I ...
September 8, 2006 by mason

Molarity
Find the molarity of a salt water solution containing 0.27 mol NaCl in 150g of H2O. My work: 0.27 mol NaCl/150 g x 1000g/1kg = 1.8 M is this correct, i wasn't really sure what to do...
November 12, 2009 by Janice

History~!!!
2) In which battle did the Americans win their first victory over the British? (1point) Lexington*** Boston Charleston Concord 4) The general purpose of the Continental Congress was to (1point) Write a new constitution for America. Unite the colonies in their opposition to ...
October 29, 2013 by Gabby

calculus
The limit as x approaches infinity of (e^x+x)^(1/x). I got that it diverges, but I'm not sure if I made a mistake. My work: lim(e+x^(1/x)) lim(e+(1/x^x)) lim(ex^x+1)/x^x l'hopital:lim(e^(e(lnx+1))+1)/e^(lnx+1) diverges?
September 1, 2010 by Dave

geography
I have one more that I want to make sure is correct! On what continent is the Chang Jiang found? My answer is Asia. Is this correct?
September 3, 2011 by Reed

physics
2. A car accelerates uniformly from +10.0 m/s to +40.0 m/s over a distance of 125 m. How long did it take to go that distance? Show all your work, including the equation used, given and unknown quantities, and any algebra required. Make sure your answer has the correct number ...
January 14, 2013 by Anonymous

psychology
After a serious injury,Lusy has lost her sensitivity to hot an cold.Therefore,she can no longer work in the kitchen because she's afraid she might burn herself.More than likely there was damage to her A hippocampus B hypothalamus C cerebellum D parietal lobe Is D correct ...
September 21, 2009 by vedrana

Chem
Nitric acid can be prepared by bubbling dinitrogen pentoxide into water. N2O5(g) + H2O -> 2H+(aq) + 2NO3-(aq) a) How many moles of H+ are obtained when 1.50 L of N2O5 at 25 degrees C and 1.00 atm pressure is bubbled into water? b) The solution obtained in (a) after reaction...
January 1, 2007 by Dave

calculus
The length of a rectangle is decreasing at the rate of 2 cm/sec, while the width w is increasing at the rate of 3 cm/sec. At what rate are the lengths of the diagonals changing at the instant that l=15 cm and w= 8 cm? Are the diagonals increasing or decreasing in length at ...
April 16, 2011 by Janet

calculus
If f is the focal length of a convex lens and an object is placed at a distance p from the lens, then its image will be at a distance q from the lens, where f, p, and q are related by the lens equation 1/f = 1/p + 1/q What is the rate of change of p with respect to q if q = 2 ...
May 6, 2011 by Sam

Statistics check
Complete the hypothesis test with alternative hypothesis d 0 based on the paired data that follows and d = O - Y. Use = 0.01. Assume normality. Oldest 188 174 192 196 65 Youngest 186 168 199 199 69 (a) Find t. (Give your answer correct to two decimal places.) Correct: ...
June 25, 2013 by Tracy 10

French
I am stumped on these two questions. Unscramble the following words tp make sentences. Be sure to use the correct form of avoir. 1. j'/ordinateur/un/avoir 2. de/n'/vous/avoir/pas/chaise I know what the words mean but im not quite sure of the correct form of avoir would be and ...
September 7, 2008 by Nicky

General Chemistry
The work done when a gas is compressed in a cylinder like that shown in Figure 6.5 is 351 J. During this process, there is a heat transfer of 269 J from the gas to the surroundings. Calculate the energy change for this process. Not sure how to do this please explain with ...
June 15, 2010 by Shayla

English
Thank you very much for teaching me both the British English and the American English alternative. By the way, do you say "What time do we land?" Is the use of the simple present correct in this sentence? I just want to make sure the following two sentences I need to include ...
October 3, 2011 by Henry2

CHEM**
I just have 2 other questions that I just want to make sure on: Place the following elements in order of decreasing atomic size: tellurium, bromine, argon, cesium, strontium, and selenium. (Te, Br, Ar, Cs, Sr, Se) ~~(or...the correct ranking cannot be determined)~~ I think ...
November 13, 2007 by K

Calculus (Please check my work!)
Suppose that y = f(x) = x^2 - 4x + 4. Then on any interval where the inverse function y = f-1(x) exists, thederivative of y = f-1(x) with respect to x is: (Hint: x^2 - 4x + 4 can be factored and rewritten as "something" squared.) Work thus far: Okay, so I know that I can ...
March 15, 2012 by Anonymous

Intermediate Algebra
Hello I need a little help with my homework. I started trying to work it out but I am not sure if it is the correct solution. Please help! Question: Population growth. The exponential growth rate of the population of United Arab Emirates is 4.4% per year (one of the highest in...
September 10, 2010 by Samantha

English - Native speakers
Hello! I am trying to figure out one of the most difficult thing in English - articles. So I have one question: Do we say I'm leaving home (Would people know that home means the place where we live?) Or is it correct I'm leaving the home? I personally think that the first ...
March 22, 2011 by Mark

chem -repost for bobpursley
i don't know how to solve this. looked through all my notes but i'm not sure what kind of formula i am to use or if i even need one! please help me to understand the theory behind this: "calculate the work need to make room for the products in the combustion of S8(s) to SO2(g...
April 17, 2011 by please, help me

English
Before you leave, make sure to lock the door. 1. - Of course, I will. 2. - Sure, I will. 3. - OK, I will. 4. - I know, Mom. 5. - I see, Mom. (Are the answers all correct and natural?)
April 7, 2014 by rfvv

English
Will you please make sure that I have picked out the correct preposition in each sentence? 1. Parts of wrecked ships filled one room. (of) 2. A museum guide spoke to us. (to) 3. During a storm sailors work very hard. (During) 4. Clippers traded with China and Australia. (with)
April 11, 2011 by Reed

Calculus
The point (1,-2) is on the graph of y^2-x^2+2x=5. Find the value of (dy/dx) and (d^2y/dx^2) at the point (1,-2). How do I find (d^2y/dx^2)? I found. I found (dy/dx) to be 2y(dy/dx)-2x+2=0, but I don't know how to take the derivative of that to get(d^2y/dx^2)? I'm not sure if ...
October 18, 2011 by W

Calculus: limits
Evaluate the limit at t --> 25: [25 - t] / [5 - √(t)] I multiplied it by √(x + 3) to get rid of the square root on the bottom. However, once I'm done distributing it out, I'm not sure I'm doing it right. I get [x√(x+3) + 2x - 2] / [x + 5] Once I plug in 25...
October 15, 2009 by Kay

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