Thursday

July 31, 2014

July 31, 2014

**Recent Homework Questions About Calculus**

Post a New Question | Current Questions

**calculus**

Find the derivative of the function. G(y) = (y − 1)3/ (y2 + 2y)7
*Thursday, October 3, 2013 at 10:18pm*

**calculus**

Determine the value(s) of x where the function will have an instantaneous rate of change of 14. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) f(x) = x3 + 33 x2 + 14 x + 39
*Thursday, October 3, 2013 at 9:58pm*

**Calculus**

Use the linear approximation (1+x)^k\approx 1+kx to find an approximation for the function f(x) for values of x near zero. I need help for (3+3x)^(1/3). Please help me!
*Thursday, October 3, 2013 at 8:50pm*

**calculus**

Find the area bounded by {y=x2−4 y=4−x2 • sketch the region described • determine any intersection point(s) for the curves (show work!!) • write out the integral(s) that will calculate the area • determine the area (may use a calculator)
*Thursday, October 3, 2013 at 6:40pm*

**calculus**

An influenza epidemic has an infection rate modeled by I ' (t)=30 e0.04 t , where t is time measured in days since the start of the epidemic on January 14th , and I '(t) measures the infection rate in people per day. On January 14th there were 800 infected people on ...
*Thursday, October 3, 2013 at 6:39pm*

**Calculus & Vectors**

Sketch the sets of complex numbers that would satisfy the following equations. a) |z| > 3 b) z = bi how would the sketches look like?
*Thursday, October 3, 2013 at 5:29pm*

**Calculus: implicit differentiation**

Find dy/dx by implicit differentiation 1. x^3 -xy+ y^2= 7 The given answer is (y-3x^2)/ (2y-x), but I'm not getting it. 2. How would I do this one? If I couldn't do the above one, which looks a heck of a lot simpler, I doubt I'll get through this one. x^ (6/7) + y...
*Thursday, October 3, 2013 at 12:19pm*

**Calculus**

Book works out integral of sqtr(a^2-x^2)dx as a^2/2*arcsin(x/a)+x/2*sqrt(a^2-x^2) by taking x=a sin theta, and advises to work it out using x=a cos theta. I did and got the first term as -a^2/2*arccos(x/a)and the same second term. This means arcsin x/a=-arccos x/a which can be...
*Thursday, October 3, 2013 at 5:07am*

**Calculus, check my answers, please? :)**

Okay, so I think these are right, but I would appreciate if someone could check them and tell me if something is wrong and what the right answer is. I'd also appreciate an explanation if possible. :)Thank you! 7. Given that f(x)={x^3 if x ≥ 0 {x if x < 0 which of ...
*Wednesday, October 2, 2013 at 11:15pm*

**Calculus, check my answers, please! **

Could someone tell me if I'm right, and if not what the correct answer is? Thank you! I'd appreciate an explanation, too, if you could. :) 1. Suppose you're given the following table of values for the function f(x),and you're told that the function is even: x f...
*Wednesday, October 2, 2013 at 11:11pm*

**Calculus**

Consider the curve given by y^2 = 2+xy (a) show that dy/dx= y/(2y-x) (b) Find all points (x,y) on the curve where the line tangent to the curve has slope 1/2. (c) Show that there are now points (x,y) on the curve where the line tangent to the curve is horizontal. (d) Let x and...
*Wednesday, October 2, 2013 at 9:36pm*

**BC Calculus**

Find a general formula for F''(x) if F(x) = xf(x) and f and f' are differentiable at x.
*Wednesday, October 2, 2013 at 9:22pm*

**Calculus, check my answers, please! 3**

Did I get these practice questions right? 1. Suppose that f is an even function whose domain is the set of all real numbers. Then which of the following can we claim to be true? ***The function f has an inverse f –1 that is even. The function f has an inverse f –1, ...
*Wednesday, October 2, 2013 at 12:28pm*

**Calculus, check my answer, please! 2**

Consider the following functions: f(x)=sin(x^4-x^2) h(x)=(|x|-3)^3 g(x)=1n(|x|)+3 s(x)=sin^3(x) Which of the following is true? h and g are even, f and s are odd. f is even, h and s are odd. h and s are even, f is odd. ***f and h are even, s is odd. f, h, and s are odd.
*Wednesday, October 2, 2013 at 12:26pm*

**Calculus, check my answer, please! 1**

Did I get this practice question right? 1. Consider the following functions: f(x)=cos(x^3-x) h(x)=|x-3|^3 g(x)=1n(|x|+3) s(x)=sin^3(x) Which of the following is true? (Points : 1) f is even, h and s are odd. ***f and g are even, s is odd. h and s are odd, g is even. s is odd, ...
*Wednesday, October 2, 2013 at 12:25pm*

**calculus**

Find the derivative... 1) f(u)= 1/ (2u^2-1)^2
*Wednesday, October 2, 2013 at 11:10am*

**Pre-Calculus**

A ball is thrown up at the edge of a 364 foot cliff. The ball is thrown up with an initial velocity of 72 feet per second. Its height measured in feet is given in terms of time t, measured in seconds by the equation h=−16t2+72t+364. How high will the ball go? To get how ...
*Monday, September 30, 2013 at 11:15pm*

**Pre-Calculus**

A local photocopying store advertises as follows. " We charge 14 cents per copy for 150 copies or less, 6 cents per copy for each copy over 150 but less than 230, and 3 cents per copy for each copy 230 and above. " Let x be the number of copies ordered and C(x) be ...
*Monday, September 30, 2013 at 10:45pm*

**Calculus**

Can some one please explain this problem to me? Find lim x->0 (sin5x/sin7x)
*Monday, September 30, 2013 at 6:53pm*

**Pre-Calculus**

A local photocopying store advertises as follows. " We charge 14 cents per copy for 150 copies or less,6 cents per copy for each copy over 150 but less than 230, and 3 cents per copy for each copy 230 and above. " Let x be the number of copies ordered and C(x) be the...
*Monday, September 30, 2013 at 2:30am*

**Pre Calculus**

He needs two adjacent rectangular enclosures - he has 300 feet of fencing. a. find a function that models the total area of enclosures with respect to the width of the enclosures. b. write your function in vertex form using the vertex formula. c. what is the largest area that ...
*Sunday, September 29, 2013 at 2:40pm*

**Calculus**

A function of three variables is given by, f (x,y,t) = x3y2sin t + 4x2t + 5yt2 + 4xycos t Find ft (3.44,0.58,8.1) giving your answer to 3 decimal places. anybody please help me... thanks a million... got stuck with this qns..
*Sunday, September 29, 2013 at 7:29am*

**Pre-Calculus**

A machine worth $ 11000 new and having a scrap value of $ 10995.6 is to be depreciated over a 4.4 -year life. Find the function that describes straight line depreciation for this situation. At what time will the machine be worth $ 10997.8 according to this model? So I know ...
*Saturday, September 28, 2013 at 2:48pm*

**Pre-Calculus**

If a manufacturer has fixed costs of $ 300 , a cost per item for production of $ 60 , and expects to sell at least 100 items, how should he set the selling price to guarantee breaking even? I set up the cost function by writing 300 + 60x, but I don't know what to do next...
*Saturday, September 28, 2013 at 1:38pm*

**Calculus & Vectors**

Sketch the sets of complex numbers that would satisfy the following equations. a)z=2 b)|z|=2 c)(5,4) d)(sqrt2, -sqrt2) Also, please explain how to do it. Thanks.
*Saturday, September 28, 2013 at 9:58am*

**Calculus Please Help??**

Evaluate the integral (3x^2-16x-19)/(x^3-4x^2-3x+18)
*Friday, September 27, 2013 at 8:11pm*

**Calculus**

Consider the indefinite integral (6x^3+3x^2-19x-10)/(x^2-4)dx Then the integrand decomposes in the form ax + b + (c/(x-2)) + (d/(x+2) I found b and c to equal 3 and d to equal 2, but I'm having trouble finding A and finding the final integration by integrating term by term.
*Friday, September 27, 2013 at 6:11pm*

**Calculus**

lim x -> infinity for (sin^2x)/(x^2-1)
*Friday, September 27, 2013 at 11:34am*

**Calculus (first year uni)**

Hello lim x->pi^- for cot(x) [In words,this is the limit of x as it approaches pi from the negative direction for the function cot(x). I am very confused as to how this occurs and turns out to be negative infinity. Thanks.]
*Friday, September 27, 2013 at 11:32am*

**calculus**

Find the inverse of the following function. Find the domain, range, and asymptotes of each function. Graph both functions on the same coordinate plane. f(x)=3+e^4−x
*Friday, September 27, 2013 at 10:27am*

**Calculus and vectors**

A vector can be used to represent the path of a drill tip used to bore a deep mine shaft in Sudbury one quarter of the way to the centre of the Earth. Represent the vector using a directed line segment and Cartesian co-ordinates and describe which representation may be more ...
*Friday, September 27, 2013 at 7:24am*

**calculus and vectors**

A traffic sign is hanging from two wires. If the weight of the sign is 35 N, what are the tensions in the two wires as shown below? (# in degrees) --------------------- \ 56 45/ \ / \ / \ /
*Thursday, September 26, 2013 at 11:19pm*

**Calculus**

Determine whether Rolle's Theorem can be applied to f on the closed interval [a,b]. If Rolle's Theorem can be applied, find all values of c in the open interval (a,b) such that f'(x)=0. f(x) = x^(2/3) - 1 [-8,8] I plugged in both values and found out that they both...
*Thursday, September 26, 2013 at 9:01pm*

**Calculus**

Snow is falling vertically at a constant rate of 8.0 m/s. At what angle from the vertical do the snowflakes appear to be falling as viewed by the driver of a car traveling on a straight, level road with a speed of 50k.h?
*Thursday, September 26, 2013 at 5:26pm*

**Calculus**

The position vector for a proton is initially r(with vector sign above it) =5.0i(with top)- 6.0j(with top) + 2.0k(with top) and then later is r vector = -2.0i(with top)+6.0j(with top)+ 2.0k (with top), all in meters. What is the proton's displacement vector, and to what ...
*Thursday, September 26, 2013 at 5:23pm*

**Calculus**

Use integration by parts to evaluate the integral xsqrt(2x+6)dx.
*Thursday, September 26, 2013 at 12:45pm*

**Calculus**

Evaluate the Integral (x^5sqrt(10+x^6))dx by making a u-substitution.
*Thursday, September 26, 2013 at 12:41pm*

**Calculus**

Int tanx sec^2x dx can be taken as (by putting it in form of Int xdx) Int secx.secx tanx dx=(sec^2x)/2 Int tanx.sec^2x dx=(tan^2)/2. Which one is correct and why is the difference?
*Thursday, September 26, 2013 at 7:51am*

**calculus**

Find all vales for a so that f(x) { x+1...x<=a { x^2...x>a is continuous
*Wednesday, September 25, 2013 at 8:45pm*

**calculus**

Suppose you know that a population,P, of termites is growing continuously in an exponential manner. (Use the formant P=P0e^kt) If the pest control service estimates that the number of termites will double in 6 months... A) Determine the monthly continuous population growth ...
*Wednesday, September 25, 2013 at 12:05am*

**Calculus**

How do I find the critical values? y= 4/x + tan(πx/8) What I did is I simplified it to y= 4x^-1 + tan(πx/8) then I took the derivative y'= -4x^-2 + (π/8)(sec(πx/8))^2 Then I simplied it y'= -4/x^2 + (π/8)(sec(πx/8))^2 then I found a ...
*Tuesday, September 24, 2013 at 9:54pm*

**Calculus**

g(x)= {0 if x<0 {x^2-2x if 0≤x≤2 {2 if x>2 Find all values x=a where the function is discontinuous. Is the answer 0 and 2 or just 2?
*Tuesday, September 24, 2013 at 9:53pm*

**Calculus**

f(x)= |x−8| / x+8 Is the function is not continuous at x= -8,8 or just at -8.
*Tuesday, September 24, 2013 at 10:50am*

**Calculus**

f(x)= ⎨x^2-1 / x+1, for x not = -1 ⎨8, for x=-1 I'm trying to graph and determine the values of x for which the function is continuous. Does the graph looks like a u shape opening up or a line.
*Tuesday, September 24, 2013 at 9:52am*

**Calculus**

6/ln[x] find the derivative... im coming up with -6/x*(ln(x))^2 but it isn't accepting the answer what am i doing wrong?
*Tuesday, September 24, 2013 at 12:45am*

**Calculus**

I hate these Y= (Square root of x) - 2 ________________________ (square root of x) + 2 Calculate dy/dx Please help, thank you
*Monday, September 23, 2013 at 11:51pm*

**Calculus**

Find the Taylor series of f(x) = sin(x) at a = Pi/3.
*Monday, September 23, 2013 at 9:49pm*

**Calculus**

Find the limit. lim x→1 x^4-5x^3+7x^2-6x+3 / x-1
*Sunday, September 22, 2013 at 10:03pm*

**Calculus**

Give an appropriate answer. Let lim x→6 f(x)=81. Find lim x→6 4^√f(x).
*Sunday, September 22, 2013 at 5:14pm*

**Pre-Calculus **

The Period T, in seconds, of a pendulum depends on the distance, L, in meters, between the pivot and the pendulum's centre of mass. If the initial swing angle is relatively small, the period is given by the radical function T=2pi(sqrtL/g) where g represents acceleration ...
*Friday, September 20, 2013 at 9:32pm*

**Calculus**

Question : Light is absorbed when it passes through a glass window. If r % of light is absorbed by a glass with thickness w, then the percent of light that is absorbed by a piece of glass with a thickness of nw for any natural number n is modeled by the following function : A...
*Friday, September 20, 2013 at 4:53pm*

**Calculus**

Find the following limit if it exists, or explain why it does not exist: lim as x approaches -infinity of square root of (9x^6-x^2) divided by x^3+5
*Friday, September 20, 2013 at 3:23pm*

**Calculus**

I have done Int(1/ax)dx=1/a*Int(1/x)dx =[(log x)/a] + C. The working in the book is Int(1/ax)dx=1/a*Int(a/ax)dx =[(log ax)/a]+C. Which one is correct and where is the error in my working, if so?
*Friday, September 20, 2013 at 2:41am*

**Calculus (math)**

Using your knowledge of trigonometric identities, ﬁnd the exact value of sin(x+y) knowing that x and y are between 0 and π2, that sin(x)=725 and that sec(y)=1312. Your answer must be a rational number, written in the form of an irreducible fraction p/q (such as 2/3...
*Thursday, September 19, 2013 at 3:52pm*

**calculus**

if y=cosx.sinx find dy/dx
*Thursday, September 19, 2013 at 11:49am*

**Pre-Calculus**

I've tried to simplify this a million different ways, but I can't seem to get the right answer. Please help. ((1/(x+h)^3)-(1/x^3))/8h
*Wednesday, September 18, 2013 at 8:54pm*

**calculus**

If lim(f+g)=1 as x-->a and lim(f-g)=1 as x-->a find lim fg as x-->a
*Wednesday, September 18, 2013 at 6:08pm*

**Calculus**

Find the Indefinite Integral without u substitution of the following a)(8x-3)/(12x^6) b) 2sqrtx(5x-6) c) (4x+3)/xsqrtx d) (5x-6)^2 / sqrt x e) 16x^2 + x - 20 / 4x^2
*Wednesday, September 18, 2013 at 4:32pm*

**Pre Calculus**

So I only have 3 homework questions left and I can't seem to figure out how to solve. I've tried solving them, but I keep getting them wrong. Any help? Factor the polynomials: a) 3x^2 +19x - 40 b) x^4 - 25x^2 Simplify the expression completely: (1/(x-h)^3 - 1/x^3)/8h
*Wednesday, September 18, 2013 at 11:15am*

**calculus**

Find complete length of curve r=a sin^3(theta/3). I have gone thus- (theta written as t) r^2= a^2 sin^6 t/3 and (dr/dt)^2=a^2 sin^4(t/3)cos^2(t/3) s=Int Sqrt[a^2 sin^6 t/3+a^2 sin^4(t/3)cos^2(t/3)]dt =a Int Sqrt[sin^4(t/3){(sin^2(t/3)+cos^2(t/3)}]dt=a Int Sqrt[sin^4(t/3...
*Wednesday, September 18, 2013 at 4:19am*

**Calculus**

Your Porsche's gas mileage (in miles per gallon) is given as a function M(x) of speed x in miles per hour. It is found that M'(x) = 3,600x−2 − 1/ (3,600x−1 + x)2. Estimate M'(10), M'(60), and M'(90). (Round your answers to seven decimal ...
*Tuesday, September 17, 2013 at 10:29pm*

**Calculus**

Your Porsche's gas mileage (in miles per gallon) is given as a function M(x) of speed x in miles per hour. It is found that M'(x) = 3,600x−2 − 1/ (3,600x−1 + x)2. Estimate M'(10), M'(60), and M'(90). (Round your answers to seven decimal ...
*Tuesday, September 17, 2013 at 10:17pm*

**Calculus derivative**

find the slope m and an equation of the tangent line to the graph of the function f at the specified point. original: x^2/x+10 point: (3,9/13) After I found the derivative: (x+10)(2x)-(x^2)(1)/((x+10))^2 How do I get the slope? Should I put 3 into the derivative equation?
*Tuesday, September 17, 2013 at 6:19pm*

**calculus (derivativs)**

Find the points on the graph of f where the tangent line is horizontal. original: x/x^2+25) After I did the quotient rule I got: (x^2+25)(1)-(x)(2x)/((x^2+25))^2 Then of course I know you set that equal to 0, but I do not know how to set it up or "finalize" the ...
*Tuesday, September 17, 2013 at 5:57pm*

**Calculus (derivatives)**

Find the points on the graph of f where the tangent line is horizontal. x/x^2+25 I know you have to do the quotient rule to find the derivative, but then I do not know what to do after that.
*Tuesday, September 17, 2013 at 5:41pm*

**calculus**

Find dy/dx, if y= 5e^x/cosx
*Tuesday, September 17, 2013 at 6:15am*

**calculus**

Find dy/dx, if y= (sinx)^-1
*Tuesday, September 17, 2013 at 6:13am*

**calculus**

to find value of x and discontinous 9x²-3x-2/3x²+13x-4
*Tuesday, September 17, 2013 at 4:24am*

**AP Calculus**

Consider the function f(x)= abs(x)(x-3)/9-x^2 a) what is the domain of f? What are the zeros of f? b) find all nonremovable discontinuities of f c) determine all vertical and horizontal asymptotes of f
*Monday, September 16, 2013 at 10:59pm*

**calculus**

Meg's pension plan is an annuity with a guaranteed return of 4% per year (compounded quarterly). She would like to retire with a pension of $20,000 per quarter for 10 years. If she works 30 years before retiring, how much money must she and her employer deposit each quarter?
*Monday, September 16, 2013 at 10:31pm*

**Calculus**

A position function has the positions listed below. t 2 4 7 10 12 f(t) 34 98 155 205 271 Approximate the instantaneous velocity at t=5. show work.
*Monday, September 16, 2013 at 9:41pm*

**Calculus**

What is the limit (as u--->2) of square root(4u+1)-3/u-2. I got 1 as an answer, but I want to check if that's right. I heard it could be something else so I'm unsure and doubtful of my answer.
*Monday, September 16, 2013 at 1:32pm*

**calculus**

Find circumference of the circle r=2acos theta. s= Int (0 to 2pi) of Sqrt(4a^2cos^2 theta+4a^2sin^2 theta)d theta =Int (0 to 2pi)2a*Int theta d theta =2a(2pi-0)=4a*pi Book shows 2a*pi. Am I wrong somewhere?
*Monday, September 16, 2013 at 4:10am*

**Calculus**

f(x) = 4/5x i need to find the derivitave but i don't know how to start this one. I know the derivitave of 4 is just zero, and i know the derivative of 5x is 5. But the answer isn't 0/5. Help please.
*Sunday, September 15, 2013 at 9:39pm*

**Calculus**

Find k such that the line [y=5x-4] is tangent to the function : x^2-kx
*Sunday, September 15, 2013 at 1:32pm*

**calculus **

evaluate lim x aproches -1 x^2+6x+5/x^2-3x-4
*Saturday, September 14, 2013 at 7:27am*

**Math - Averages**

The test average for Louis' calculus class is found by taking the arithmetic mean of his four best test scores. If his first four test scores are 65,82,76 and 87, what score must he get on the fifth test to raise his test average to an 85?
*Friday, September 13, 2013 at 11:04am*

**calculus (integral)**

evaluate the integral: integral of 13/(x^3 - 27) dx
*Friday, September 13, 2013 at 2:45am*

**AP Calculus**

I asked this yesterday and someone answered. but i didn't understand the explanation.. Two circles of radius 4 are tangent to the graph of y^2=4x at the point (1,2). Find equations of these two circles. I got (x-1)^2+(y-2)^2=16 and (x-4.36)^2+(y+1.36)^2=16
*Thursday, September 12, 2013 at 4:53pm*

**Calculus**

Find arc length of y=logx from x=1 to x=2. dy/dx)^2=1/x^2 arc length=Int of [sqrt(1+1/x^2)]dx =Int of [sqrt(1+x^2)/x^2] =Int of [sqrt(1+x^2)]/x from x=1 to x=2. How to proceed further to integrate?
*Thursday, September 12, 2013 at 4:20am*

**Calculus**

I'm reviewing for a test tomorrow and two of the questions on the review had me a little stumped. Lim Sq. Rt.(x+5) - Sq. Rt (5) all divided by X-->0 X I was able to rationalize and ended up with (X)/ x ((sq. rt.(x+5))+ sq. rt.(5)) which gives me 1/ sq. rt.(5)+ sq. rt.(5...
*Thursday, September 12, 2013 at 2:52am*

**Calculus **

You are creating a rectangular garden and want to surround it with brick edging. You also are going to divide it into two halves with the edging so that your vegetables and herbs are on one side and flowers are on the other. You only have 120 ft worth of brick edging and want ...
*Wednesday, September 11, 2013 at 9:14pm*

**Pre-Calculus**

Perform the indicated operation, then simplify. 5a2 + 12a + 4/a4 − 16 ÷ 25a2 + 20a + 4/a2 − 2a I think I'm supposed to switch the top and bottom, and then multiply. Is this correct?
*Wednesday, September 11, 2013 at 7:58pm*

**AP Calculus**

A projectile fired upward from ground level is to reach a maximum height of 1,600 feet. What is its initial velocity?
*Wednesday, September 11, 2013 at 5:22pm*

**AP Calculus**

Two circles of radius 4 are tangent to the graph of y^2=4x at the point (1,2). Find equations of these two circles. I found the derivative of y^2=4x, but i don't know what to do next!
*Wednesday, September 11, 2013 at 5:21pm*

**Pre-Calculus **

3x^2 + 8 = -4
*Wednesday, September 11, 2013 at 4:58pm*

**Calculus**

Find the limit of the sequence {√(2), √(2√(2)), √(2√(2√(2))),...
*Tuesday, September 10, 2013 at 8:26pm*

**Maths-Calculus **

If f(2)=1 and f(2+h)=(h+1)3, compute f′(2). If f(−1)=5 and f(−0.9)=5.2, estimate f′(−1). If the line y=−3x+2 is tangent to f(x) at x=−4, find f(−4). Your answer should be expressed as an integer. If the line y=x−1 is ...
*Tuesday, September 10, 2013 at 5:08am*

**calculus**

Integral sin 8x/2 cosx/2 dx
*Tuesday, September 10, 2013 at 12:18am*

**calculus**

Integral -csc^2 (2x+9)dx
*Tuesday, September 10, 2013 at 12:17am*

**calculus**

integral cos(4z-5)dz
*Tuesday, September 10, 2013 at 12:17am*

**calculus**

integral 3z^6 sqrt(2-3z^7)dz
*Tuesday, September 10, 2013 at 12:16am*

**calculus**

Use the indicated substitution to evaluate the integral integral 18sec(2x) tan(2x)dx, u=2x
*Tuesday, September 10, 2013 at 12:15am*

**calculus**

find the points on a graph of f where the tangent line is horizontal. f(x)= x^3 - 18x^2 (x,y)= (smaller x value) (x,y)= (larger x value)
*Sunday, September 8, 2013 at 10:03pm*

**Calculus/Physics?**

Define a function f(v)={c:v€[0,v(subscript)0) 0 : v€ [v(subscript)0,+∞} On v €[0,+∞). Here and v(subscript)0 are positive constants. A) Compute ∫v=0,+∞; f(v)dv B) Suppose c=1/v(subscript)0, find ∫v=0,+∞;v f (v)dv
*Sunday, September 8, 2013 at 6:10pm*

**Math**

Okay, I'm in a calculus class but stuck on some algebra...it's not crucial that I get the answer to this but I'm wracking my brain because I can't remember how the following is obtained; if you can show me how this is done in steps I'd greatly appreciate it...
*Sunday, September 8, 2013 at 4:48pm*

**calculus**

An electrical circuit switches instantaneously from a 3 volt battery to a 23 volt battery 6 seconds after being turned on. Sketch on a sheet of paper a graph the battery voltage against time. Then fill in the formulas below for the function represented by your graph. For t<...
*Sunday, September 8, 2013 at 3:08pm*

**calculus**

use the method of cylindrical shells to find the volume of the solid obtained by rotating the region bounded by the given curves about the x-axis. sketch the region and a typical shell. x=1+y^2, x=0, y=1, y=2
*Sunday, September 8, 2013 at 2:28pm*

**calculus**

find the volume of the solid obtained by rotating the region bounded by the given curves about the specified line. sketch the region and a typical disk or washer. y^2=x, x=2y; about the y-axis i am confused because i do not know how to set it up because one is Y and the other ...
*Sunday, September 8, 2013 at 2:27pm*

**calculus **

find the area enclosed by the given curves. y=squareroot of x y=x/2 x=9 * i just graph it but do not know how to set it up the equation or anything.
*Sunday, September 8, 2013 at 2:23pm*

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