Sunday
September 25, 2016

# Homework Help: Math: Calculus

## Recent Homework Questions About Calculus

Calculus AB
Use the table below to evaluate d/dx [f[g(2x)]] at x = 1 x 1 2 3 4 f(x) 6 1 8 2 f '(x) 6 1 8 2 g(x) 1 4 4 3 g '(x) 9 5 5 -4 I don't know how to continue with this question. i know [g(2x)]=8...pretty sure
Wednesday, January 13, 2016 by Vik

Calculus
Integrate 1/sinx dx using the identity sinx=2(sin(x/2)cos(x/2)). I rewrote the integral to 1/2 ∫ 1/(sin(x/2)cos(x/2))dx, but I don't know how to continue. Thanks for the help. Calculus - Steve, Tuesday, January 12, 2016 at 12:45am 1/2 ∫ 1/(sin(x/2)cos(x/2))dx ...

Math (Calculus - Limits)
Find the constant c so that lim x->8 x^2+2x+c/x^2-15x+56 exists. For that value of c, determine the limit. (Hint: Find the value of c for which x-8 is a factor of the numerator). I understand that I should set (x-8)(x+b) equal to x^2+2x+c but all the variables are getting ...
Tuesday, January 12, 2016 by Charlotte

calculus
It is estimated that t years from now, the value of a small piece of land, V(t), will be increasing at a rate of 1.6t^3/(0.2t^4+8100)^(1/2)dollars per year. The land is currently worth $420. Find V(t) and also find the value of the land after 10 years to the nearest cent. Tuesday, January 12, 2016 by beth Calculus AB If f(x) = |(x^2 - 6)(x^2 + 2)|, how many numbers in the interval 1 ≤ x ≤ 2 satisfy the conclusion of the mean value theorem? None One Two Three Not sure where to start. Like my previous question, I don't have a book or help from my teacher. Tuesday, January 12, 2016 by Vikram Calculus AB If f(x) is differentiable for the closed interval [-3, 2] such that f(-3) = 4 and f(2) = 4, then there exists a value c, -3 < c < 2 such that f(c) = 0 f '(c) = 0 f (c) = 5 f '(c) = 5 Not really sure where to start here. No textbook and my teacher never explained it Tuesday, January 12, 2016 by Vikram Calculus What airspeed and direction should an airplane maintain in order to continue having a ground speed of 800 km/h and a direction of 140° with wind at 130 km/h at 27°? Tuesday, January 12, 2016 by Geoff Calculus help!!! X^2y+sinxy=e^xy i need solution plz Tuesday, January 12, 2016 by Daniel Calculus A manufacturer of a certain brand of appliance estimates that he can sell 5000 units a year at Php 900.00 each and that he can sell 1500 units more per year for each Php 100.00 decrease in price? What price per unit will give the greatest returns? Tuesday, January 12, 2016 by En Calculus Since f(x)=√(x-3) has an absolute minimum of 0 does its critical point exist? I'm really confused because someone mentioned that f(x)=√(x+3) does not have a critical point. Does that mean that if there is an end point there, there can't be a critical point? Tuesday, January 12, 2016 by Isabella calculus Suppose f is a function of x. 1) find d/dx f^2 2)use the result to find the integral ∫ lnx/xdx. I did 1), and I got 2fdf, but im confused about number 2. Monday, January 11, 2016 by Jacob Calculus Find all points on the graph of the function f(x) = 2 cos(x) + (cos(x))2 at which the tangent line is horizontal. Consider the domain x = [0,2π). I have pi/2 and 3pi/2 for x values. But when I plug them I get zero. Is this correct as y values or am I solving it wrong? I ... Monday, January 11, 2016 by Calculus Calculus Integrate 1/sinx dx using the identity sinx=2(sin(x/2)cos(x/2)). I rewrote the integral to 1/2 ∫ 1/(sin(x/2)cos(x/2))dx, but I don't know how to continue. Thanks for the help. Monday, January 11, 2016 by Andre Calculus AB Find the x-coordinates of any relative extrema and inflection point(s) for the function f(x) = 3x(1/3) + 6x(4/3). You must justify your answer using an analysis of f '(x) and f "(x). My start to a solution: x-values: (-1/8) and (-1/4) I got -1/8 from f'(x)- ... Monday, January 11, 2016 by Vikram Calculus AB What is the maximum volume in cubic inches of an open box to be made from a 16-inch by 30-inch piece of cardboard by cutting out squares of equal sides from the four corners and bending up the sides? Your work must include a statement of the function and its derivative. Give ... Monday, January 11, 2016 by Vikram Calculus For the following function, find the relative max's or min's using any method. I'm having a hard time finding the critical points... Sunday, January 10, 2016 by Isabella Calculus For the function below, determine the intervals of concavity: f(x)=xlnx I tried doing it but the second derivative would always be f''(x)=1/x, so it would be concave up at x>0 and concave down at x<0, which is wrong. Also, for the function below, determine the ... Sunday, January 10, 2016 by Isabella calculus Find a cubic function y = ax3 + bx2 + cx + d whose graph has horizontal tangents at the points Saturday, January 9, 2016 by Kyle Physics with Calculus qsub1:-2.8uC qsub2: 6.6uC qsub2 sits 7.9 cm away from qsub2, and in a previous question moved up the y axis 2.7cm. The question that I am having difficulty with has added qsub3 in the middle of of qsub1 and qsub2, changing the magnitude of Fsub2net= 7.954. What is the sign and... Saturday, January 9, 2016 by Jessica Calculus @ Henry I worked some on this earlier, and botched it a bit, so here goes again. A water tank is made by rotating f(x)=2^x-1 between [0,2] about the y-axis. The water tank is initially full, when a hole is opened at the bottom tip so that the water drains at a rate of 4 unit^3/second... Friday, January 8, 2016 by Steve Calculus The side of a square is measured to be 10 ft with a possible error of ±0.1 ft. Use differentials to estimate the error in the calculated area. Include units in your answer. Friday, January 8, 2016 by Mel Calculus Water is drained out of tank, shaped as an inverted right circular cone that has a radius of 16cm and a height of 8cm, at the rate of 4 cm^3/min. At what rate is the depth of the water changing at the instant when the water in the tank is 6 cm deep? Show all work and include ... Friday, January 8, 2016 by Mel Calculus The position function of a particle in rectilinear motion is given by s(t) = 2t^3 – 21t^2 + 60t + 3 for t ≥ 0. Find the position and acceleration of the particle at the instant the when the particle reverses direction. Include units in your answer. Friday, January 8, 2016 by Mel Calculus What is the maximum volume in cubic inches of an open box to be made from a 16-inch by 30-inch piece of cardboard by cutting out squares of equal sides from the four corners and bending up the sides? Your work must include a statement of the function and its derivative. Give ... Friday, January 8, 2016 by Mel Calculus Find the x-coordinates of any relative extrema and inflection point(s) for the function f(x) = 3x^(1/3) + 6x^(4/3). Please use an analysis of f ′(x) and f ′′(x). Friday, January 8, 2016 by Mel calculus A wire along 1 meter is divided into three parts . The first part is formed into a circle , the second part is formed into an equilateral triangle , and the third part is formed into a square . Determine the size of each section so that the total area of the three wake formed ... Friday, January 8, 2016 by jon Calculus A water tank is made by rotating f(x)=2^x-1 between [0,2] about the y-axis. The water tank is initially full, when a hole is opened at the bottom tip so that the water drains at a rate of 4 unit^3/second. How fast is the height of the water decreasing when the height has ... Friday, January 8, 2016 by Henry Another Calculus help plz Integrate:( dx/root(x^2-4x)^3 help me show it solution Tuesday, January 5, 2016 by Collins Calculus help plz Integrate:(K+1/k^2+4k+8)dx Tuesday, January 5, 2016 by Collins Calculus Which of the following integrals represents the volume of the solid formed by revolving the region bounded by y=x^3, y=1, and x=2 about the line y=10? a) pi*∫from (8-1) of (10-y)(2-y^(1/3))dy b) pi*∫ from (1-2) of (81-(10-x^3)^2)dx c)2pi*∫from (1-8) of y(2-y... Monday, January 4, 2016 by Fred calculus the region bounded by the graph f(x)=x(2-x) and the x axis is revolved about the y axis. Find the volume of the solid. I did the integral using the shell method, but the answer wasn't correct. Monday, January 4, 2016 by john Calculus Find the volume generated by rotating about the x axis the area bounded by x=0, y=2sinxcosx,, y=2cosx, and x=4, if 0≤x≤pi/2. I don't get the graph. Monday, January 4, 2016 by Andre Calculus help plz i do not no it at all Integrate: xrootof(2+3.fourth rootof(x^3)/x^6.root(x) plz help i do not no it at all show working!! Monday, January 4, 2016 by Collins Calculus A ball is thrown straight up from the top of a hill 30 feet high with an initial velocity of 72ft/sec. How high above level ground will the ball get? (Objects subjected to gravity adhere to s(t) = -16t^2 + v0t + so where s is the height of the object in feet v0 is the initial ... Monday, January 4, 2016 by Help Another Calculus help plz Show that if y=tanx/2 dy/dx=1/sinx Monday, January 4, 2016 by Collins Calculus help plz Integrate:cosmxcosnx.dx if m=n i can not solve it i have tried my best but to no avail Monday, January 4, 2016 by Collins Calculus A thin plate lies in the region between the circle x^2+y^2=4 and the circle x^2+y^2=1 above the x axis. Find the centroid. For the second part, same question except the region in the first quadrant instead of above x axis. For part a, I figured out bar x is 0, and I tried to ... Sunday, January 3, 2016 by Andre Calculus pz help urgently Integrate:sinxcos(x-1/4.pi)dx Sunday, January 3, 2016 by Collins Calculus Last one for me. Evaluate (3x^2)/sqrt(1-x^6) dx I changed sqrt (1-x^6) into 1^(1/2)- x^(3) and let u=1^(1/2)- x^(3) then I got du/dx=3x^2 and subbed dx=du/3x^2 into the equation and got x-(x^4/4) but its not right. Options 7x^3/(3sqrt(1-x^7) + C cos-1(3x) + C sin-1(x^3) + C ... Saturday, January 2, 2016 by Henry Calculus Which of the following integrals cannot be evaluated using a simple substitution? I think it is A because if you would substitute there would be nothing left in the equation? Is that right? Options ∫√(x-1) ∫1/√(1-x^2) ∫x/√(1-x^2) ∫&#... Saturday, January 2, 2016 by Henry Calculus ∫(x^3-x^2)/x^2 I got (x^2)/(2)-x + C but that's not one of the answers Options x - 1 + C (x^2/2)-(x^3/3) + C (x^4-x^3)/4x^2 + C (x^2/2) -x + C Saturday, January 2, 2016 by Henry Calculus help plz Evaluate in (cuberootof(x+1)/(x-1)).1/(x+1)dx help plz Saturday, January 2, 2016 by Collins Calculus ∫((cos^3(x)/(1-sin^(2)) What is the derivative of that integral? I have been trying to use trig identities but can't find one to simplify this equation. I can't find one for (cos^3(x) or (1-sin^(2)) My options -sin(x) + C sin(x) + C (1/4)cos^(4)(x) + C None of ... Saturday, January 2, 2016 by Henry calculus Determine if the Mean Value Theorem for Integrals applies to the function f(x) = x^3 − 9x on the interval [−1, 1]. If so, find the x-coordinates of the point(s) guaranteed to exist by the theorem. Not quite sure how to do this one at all to be completely honest. ... Friday, January 1, 2016 by Jason Reposting calculus help plz Dy/dx=(X+x^3)/y help show working Friday, January 1, 2016 by Collins Calculus need help Dy/dx=x+x^3/y plz show your work Friday, January 1, 2016 by Collins Calculus A 20 meter long steel cable has density 2 kg per meter. It is hanging straight down. There is a 100 kg bucket of concrete attached to the bottom. How much work is required to lift the bucket 10 meters by lifting the cable ten meters? Gravitational force equals 9.8 in this ... Thursday, December 31, 2015 by Andre Calculus A cylindrical water tank has radius r=1 meter and height 10 meters. Suppose the tank is lying on its side and is filled halfway with water. How much work does it take to pump all the water out the top of the tank? The height is now 2 meters. Thanks, I'm not really sure how... Thursday, December 31, 2015 by Quentin Calculus The balance in an account triples in 20 years. Assuming that interest is compounded continuously, what is the annual percentage rate? I found the equation: y=e^(xln3/20) assuming that y0=1 I got 5.64%, is that right? Monday, December 28, 2015 by Gary Calculus Find the integral of 2/((2-x)(x+2)^2)dx. Sunday, December 27, 2015 by Henry Algebra Over 350 students took a college calculus final exam. the scores of the students follow a normal distribution. using the information given below, determine the mean and the standard deviation for the students'scores. Give your answers to the nearest tenth of a percent. 1. ... Sunday, December 27, 2015 by Stephanie Calculus Solve the following problem by separation of variables. T^2y'-t=ty+y+1 Y(1)=0 Y is a function of t. Friday, December 25, 2015 by Henry Calculus Integrate sinx(cosx)^2dx using the substitution u=sinx. I know how to do this using u =cosx, but not sinx. The next problem on the homework was the same question except it asked to use u=cosx, so there couldn't have been a mistake. Wednesday, December 23, 2015 by Larry Calculus Find the integral from 0 to 2 of xsqrt(5-sqrt4-x^2)). The hint said to use substitution of u=sqrt(4-x^2), and that I needed one more substitution, but I don't know how to do it. Wednesday, December 23, 2015 by Henry Calculus Find a function of the form f(x)=a+bsqrtx that is tangent to the line 2y-3x=5 at the point (1, 4) Tuesday, December 22, 2015 by Kaitlyn Calculus Determine whether the statement is true or false. If it is false, give an example for which the statement fails. a) if f has a relative maximum at x0, then f(x0) is the largest value that f(x) can have Monday, December 21, 2015 by Anonymous Calculus i need help (Cosx)^y=x^siny find dy/dx at point pi/(4,0) Sunday, December 20, 2015 by Collins calculus Find a cubic polynomial such as f(x)=ax^3+bx^2+cx+d that has horizontal tangents at the points (-5,4) and (4,-4) Saturday, December 19, 2015 by em calculus A wooden artifact recovered from a tomb contains 29% of the carbon-14 that is present in living trees. The half life of carbon-14 is 5730 years. How long ago was the artifact made? Friday, December 18, 2015 by jeremy Pre-calculus/ trig Given the vectors a= (-1,9) and b= (4,2) explain the difference between a-b and b-a. Thank you for your help! :) Thursday, December 17, 2015 by Rachel Pre-calculus A square of size x inches is cut out of each corner of an 8in by 12in piece of cardboard, and the sides are folded up to form an open-topped box. Determine the dimensions of the cut-out squares that will produce the box of maximum volume. Wednesday, December 16, 2015 by jul Pre-calculus: Logarithms ln56/ln7=ln8. Is this true or is this false? How can I find this out? Wednesday, December 16, 2015 by jenny calculus A person can row at a constant speed of 6 miles per hour. If the rower wants to row directly across a river with a current of 2 mph, at what angle should they row? How fast does the boat actually cross the river? Tuesday, December 15, 2015 by teddy Calculus Water is running into an open conical tank at the rate of 9 cubic feet per minute. The tank is standing inverted, and has a height of 10 feet and a base diameter of 10 feet. At what rate is the exposed surface area of the water changing when the radius is 2 feet? Monday, December 14, 2015 by Lacy Calculus Water is running into an open conical tank at the rate of 9 cubic feet per minute. The tank is standing inverted, and has a height of 10 feet and a base diameter of 10 feet. At what rate is the radius of the water in the tank increasing when the radius is 2 feet? Monday, December 14, 2015 by Lacy Calculus The curve y = 11x - 24 - x^2 cuts the x-axis at points A and B, and PN is the greatest positive value of the y coordinate. Show that 2 PN • AB equals three times the area bounded by that portion of the curve which lies in the first quadrant. Kinda confused on how to do this Monday, December 14, 2015 by Pip Paladins Calculus, Physics The curve y = 11x - 24 - x^2 cuts the x-axis at points A and B, and PN is the greatest positive value of the y coordinate. Show that 2 PN • AB equals three times the area bounded by that portion of the curve which lies in the first quadrant. Kinda confused on how to do this Monday, December 14, 2015 by Pip Paladins calculus Let Y = 7x sin-1(2x)+^3 square root 1+4x2. Find Y'. I don't know how to do the square root part. I have done y'= (7x)' (Sin^-1(2x)) + (7x)(sin^-1)'+...... y'= 7 sin^-1 + (7x)sq(2x)'/square root (1-(2x))^2 + ..... Sunday, December 13, 2015 by Jason Calculus A spherical balloon is being inflated so that, at the time when the radius is 5m, the radius is increasing at the rate of 0.15m/s. (A) Find the rate of increase of the volume at this time. (B) If the rate of increase of volume thereafter remains constant, find the rate at ... Sunday, December 13, 2015 by John Calculus Consider the curve below. x = (cos(t))^2 y = cos(t) 0 ≤ t ≤ 6π (a) Find the distance traveled by a particle with position (x, y) as t varies in the given time interval. (b) What is the length of the curve? I have no idea on how to evaluate this integral. I ... Saturday, December 12, 2015 by Jed calculus Anti-Derivatives 2x^6-x^3/x^2 Friday, December 11, 2015 by Jason Calulus Fundamental Theorem of Calculus 1. (4e^x-3)dx plus the number in x (6,1) Friday, December 11, 2015 by Daniel Calculus As an ice cube melts its surface area in decreasing at a rate of 6 cm^2 / sec. Find the rate at which the length of each side is decreasing at the moment when each side has length 2 cm. Friday, December 11, 2015 by Daniel Pre-calculus A researcher performs an experiment to test a hypothesis that involves the nutrients niacin and retinol. She feeds one group of laboratory rats a daily diet of precisely 34.53 units of niacin and 25,430 units of retinol. She uses two types of commercial pellet foods. Food A ... Thursday, December 10, 2015 by Gift Calculus A coal-burning electrical generating plant emits sulfur dioxide into the surrounding air. The concentration C(x), in parts per million,is approximately given by the function: C(x)= 0.5/x^2, where x is the distance away from the plant in miles. The instantaneous rate of change ... Wednesday, December 9, 2015 by Anonymous Calculus The area of a square with a side s is A(s)=s^2.What is the rate of the change of the area of a square in respect to its side? Wednesday, December 9, 2015 by Anonymous Calculus Determine the values of x for which the function is continuous: f(x)= 10x^2-10 Wednesday, December 9, 2015 by Anonymous calculus find the area of the region: y=4 y=2sqrt(x) y=3-x Wednesday, December 9, 2015 by georges Calculus A parabolic arch bridge has a 60ft base and a height of 24ft. Find the height of the arch at a distance of 5, 10, and 20 ft from the center Tuesday, December 8, 2015 by Net Calculus I am standing on the roof of a building with a pea shooter, and I shoot a pea up into the air from a height of 80 feet. The pea reaches its maximum height 2 seconds after I shoot, then falls to the ground. Give the position of the pea as a function of time Tuesday, December 8, 2015 by Jose Calculus AB If f(x) is continuous on the interval [4, 7], how many of the following statements are true? A. f(x) has a maximum value on [4, 7]. B. f(x) has a minimum value on [4, 7]. C. f(7) > f(4) D. lim f(x) = f(6) ᵡ¨6 Tuesday, December 8, 2015 by Billy Calculus Find the sum of the squared errors for the linear model f(x) and the quadratic model g(x) using the given points. f(x) = 2.0x − 3, g(x) = 0.09x^2 + 1.6x − 3 (−1, −4), (1, −2), (2, 0), (4, 6), (6, 9) linear model-? quadratic model- ? Tuesday, December 8, 2015 by Calculus Help Calculus Find the sum of the squared errors for the linear model f(x) and the quadratic model g(x) using the given points. f(x) = −0.7x+3, g(x)=0.06x^2−0.6x+2 (−3, 5), (−1, 3), (1, 2), (3, 1) linear model-? quadratic model -? Tuesday, December 8, 2015 by Calculus Help Mulitvariable Calculus How to proof tangential and normal components of a vector Thank you Tuesday, December 8, 2015 by cal Calculus A spotlight on the ground is shining on a wall 24\text{m} away. If a woman 2\text{m} tall walks from the spotlight toward the building at a speed of 0.6\text{m/s}, how fast is the length of her shadow on the building decreasing when she is 2\text{m} from the building? Tuesday, December 8, 2015 by Spencer Calculus A home owner wants to fence in his yard of 600 sq. feet. Three sides are to be constructed with chain link fence at a cost of 3.25 per linear feet. The fourth side is to be constructed with a wood stockade fence at a cost of$5.45 per linear foot. A) what is a complete model ...
Monday, December 7, 2015 by Jen

calculus
Find the critical numbers x1 and x2 of y=(9x^2+3)/4x.
Monday, December 7, 2015 by beth

calculus
Use implicit differentiation to find the slope of the tangent line to the graph of 18*x^(1/2)+5y^(1/2)+14 at(81/324,1)
Monday, December 7, 2015 by beth

calculus
Find the derivative of y=(7x^(1/3))/(x^2+9)
Monday, December 7, 2015 by beth

calculus
Find the derivative of 4sinx(6cosx+9sinx) at x=¦Ð/6.
Monday, December 7, 2015 by beth

Calculus
Compute the surface area of revolution about the x-axis over the interval. y = x^2, [0, 4] Is it (pi/12)(65^2 - 65)^(3/2)?
Monday, December 7, 2015 by Sanaya

Calculus
Find the derivative of f(x)=(2x)^(1/2)ln(15x)
Monday, December 7, 2015 by Erik

Calculus
Find the derivative of y=(2*x^(3/2))/(x^2+5)
Monday, December 7, 2015 by Erik

Calculus
A baseball diamond is a square 90 ft on a side. A player runs from first base to second base at 15 ft/sec. At what rate is the player's distance from home base increasing when he is half way from first to second base?
Monday, December 7, 2015 by Erik

calculus
Sam has 1200 feet of fencing and wants to fence off a rectangular field that borders a straight river. He needs no fence along the river. Express the area of the field as a function of its dimension. Find the dimensions of the field that has the largest area.
Monday, December 7, 2015 by hartati

Calculus
How do I integrate sqrt of (1+e^(2x)) if doing u-sub.. u=sqrt of (1+e^(2x)) and ten using partial fraction...?
Sunday, December 6, 2015 by Sanaya

Calculus
Set up a double integral for calculating the flux of the vector field F⃗ (r⃗ )=r⃗ , where r⃗ =⟨x,y,z⟩, through the part of the upward oriented surface z=9(x^2+y^2) that lies above the disk x^2+y^2≤25.
Sunday, December 6, 2015 by A

Calculus
Find the surface area of the part of the sphere x2+y2+z2=81 that lies above the cone z=√(x2+y2)
Sunday, December 6, 2015 by A

calculus
what point of f(x)= e^(1-x^2) is concave down? I think it is 1/2 but I'm not sure
Sunday, December 6, 2015 by tedd

calculus
A satellite is free falling from a distance "d" of the surface of the moon with radius "r", with zero initial velocity. At what rate does the area of the portion of the moon visible to the satellite decrease at a time "t" after the free fall ...
Saturday, December 5, 2015 by Steve

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