Monday
July 6, 2015

Homework Help: Math: Calculus

Recent Homework Questions About Calculus

Calculus
A particle moves on a vertical line so that its coordinate at time t is 3 y = t − 12t+ 3, t≥ 0 . When is the particle moving upward and when is it moving downward? Find the distance that the particle travels in the first 3 seconds. I got that t=2 and t=-2 and its ...
Sunday, July 5, 2015 by John

Calculus
How do the constants 5, 4, and 12 in f(x) = 5x^2 - 4x + 12, affect the derivative? Thanks!
Sunday, July 5, 2015 by Fred

calculus
radioactive Carbon 14 in a dead organism decays according to the equation A=A e^.000124t where t is in years and A0 is the amount at t=0. Estimate the age of a skull uncovered in an archeological site if 10% of the original Carbon 14 is still present.
Friday, July 3, 2015 by veronica

Calculus Minimum
Problem: Find minimum?maximum for: y=xa^(1/x) Ans given: X=ln(a) (min) Can't get to it.
Thursday, July 2, 2015 by Anonymous

Calculus
Find the limit of cosx/(1-sinx) as x->(pi/2) from + side
Thursday, July 2, 2015 by Patricia

calculus
calculate the largest area possible that can be made by a 15 meter long wire that will be bent to form a closed plane area. No figure given
Thursday, July 2, 2015 by Jhun

calculus
Car A is 30 mi apart from car b. Car A moves 30 mph due east at the same time car b moves 30 degrees south of east. how fast is the distance between them changing after an hour.
Thursday, July 2, 2015 by Jhun

calculus
p=-1/5x+200 Cost of a Commodity. The price p, in dollars, of a certain commodity and the quantity x sold. Obey the demand equation. p= -1/5x+200
Wednesday, July 1, 2015 by Anonymous-2

Calculus Derivative
Find derivative: y= e^(x^x)
Wednesday, July 1, 2015 by Anonymous

Differential calculus
The voltage across the plates of a capacitor at any time t seconds is given by V=Ve -t/CR, where V,C and r are constants. Given V = 300 Volts, C =0.12*10-6 F and R = 4*10 6 ohms Find the initial rate of change of voltage and the rate of change of voltage after 0.5 seconds
Tuesday, June 30, 2015 by lee

calculus
Find the complex zeros of the polynomial function. F(x)=5x^4-16x^3-22x^2+200x-39
Tuesday, June 30, 2015 by Anonymous-2

Calculus
A rectangular page is to contain 72 square inches of print. The page has to have a 4 inch margin on top and at the bottom and a 2 inch margin on each side. Find the dimensions of the page that minimize the amount of paper used.
Monday, June 29, 2015 by Uri

calculus
Cost of a Commodity. The price p, in dollars, of a certain commodity and the quantity x sold. Obey the demand equation. p= -1/5x+200
Sunday, June 28, 2015 by Anonymous-2

Calculus Partial Fraction
Sorry. The problem should have been: (x^2)/(x^3-8)(x-2)
Sunday, June 28, 2015 by Anonymous

Calculus Partial Fraction
(x^2)/(x^3)(x-2)
Sunday, June 28, 2015 by Anonymous

Calculus, derivatives
Derivative of y=(a^x)+(x^a). Show steps, please.
Saturday, June 27, 2015 by Walt

Pre Calculus
Let θ be an angle in quadrant IV such that cosθ = 4/9. Find the exact values of csc θ and cot θ. I am just completely lost! Thanks!
Friday, June 26, 2015 by Anonymous

Calculus
Demand Equation. The price(in dollars),and the quantity x sold of a certain product, obey the demand equation. I can't figure out what price the company should charge to maximize revenue p=-1/10x+150 R=p*x R=((-1/10)*x+150)*x R=(-1/10)*x^2+150x y=ax^2+b*x+c a=-1/10 b=150 c...
Monday, June 22, 2015 by Anonymous-1

Calculus(math)
A particle is moving on a straight line in such a way that its velocity v is given by v(t)=2t+1 for 0≤t≤5 where t is measured in seconds and v in meters per second. What is the total distance traveled (in meters) by the particle between times t=0 seconds and t=5 ...
Sunday, June 21, 2015 by Alice

calculus
The base of a solid is the circle x2 + y2 = 9. Cross sections of the solid perpendicular to the x-axis are equilateral triangles. What is the volume, in cubic units, of the solid?
Sunday, June 21, 2015 by Anonymous

Calculus AB
Gateway Arch in St. Louis was constructed using the equation y=211.49-20.96cosh(0.03291765x) where |x|<=91.20 a) what is the height at its center in meters b) At what points is height 70m (2 values of x) c) what is the slope of arch at points in part b
Sunday, June 21, 2015 by Patricia

Calculus
Using a graphing calculator and the concept of differentials determine the values for x when 1/(1+3x)^5 is approx = to (1-15x) within .01
Sunday, June 21, 2015 by Greg

Calculus
Ferris wheel has radius of 26m. At what rate is the rider's height increasing, when rider is 25 m from ground.
Sunday, June 21, 2015 by Mike

pre-calculus
Steve, The following rational function describes concentration in blood of a certain medicine taken once depending on time, find: A. the horizontal asymptote B. the vertical asymptote C. describe their possible meaning ( I only need help with C). f(x)=x/x^2-100 Sharon
Saturday, June 20, 2015 by Sharon

pre-calculus
The following rational function describes concentration in blood of a certain medicine taken once depending on time, find: A. the horizontal asymptote B. the vertical asymptote C. describe their possible meaning ( I only need help with C
Saturday, June 20, 2015 by Sharon

Calculus
Using differentials find dy and delta y when y=7/x and dx=delta x =1
Saturday, June 20, 2015 by Pat

Calculus
two sides of triangle are 10m and 19m and the angle between them is increasing at a rate of 2 degrees per minute. How fast is the third side changing when the angle between them is 60 degrees
Saturday, June 20, 2015 by Pat

Calculus
A 0.9 ml dose of a drug is injected into a patient steadily for half a second. At the end of this time, the quantity, Q, of the drug in the body starts to decay exponentially at a continuous rate of 0.4% per second. Using formulas, express Q as a continuous function of time, t...
Thursday, June 18, 2015 by Devon

calculus
The following rational function describes concentration in blood of a certain medicine taken once depending on time, find: A.the horizontal asymptote(s) B.the vertical asymptote(s) C. describe their possible meanings Horizontal asymptote is y=-100 vertical asymptotes are x=-10...
Wednesday, June 17, 2015 by Sharon

Calculus
One side of a rectangular animal pen is to be formed by the side of a barn. If you have enough material to build a total of 34 feet of fence, find the maximum area than can be enclosed
Wednesday, June 17, 2015 by Bella

Calculus
Okay, so I worked out 17 = T(10) = 2 + 23e ^10k 15/23 = e^10k k= 1/10ln(15/23) k = - 0.043 But when I do this equation 17 = T(30) = 2 + 23e^30k 15/23 = e^30k k = 1/30ln(15/23) k = -0.142 But the answer is apparently 8.38? Can someone please help. I think I'm getting too ...
Wednesday, June 17, 2015 by Anonymous

pre-calculus 11
I have a question that two ski decide to have a race. I need show a graph of height versus time of the two skiers going over a jump. I am assuming that both skiers graphs would be parabola's and have a maximum height with both graphs opening downward.
Tuesday, June 16, 2015 by george

pre-calculus 11
The infinite series 1+3x +9x^2 +27x^3+.. has a sum of 4.The value of x is? so if 1/1-r I substitute 1/1-3x =4 so x=1/4 if someone could confirm that my answer is correct? thanks so much
Tuesday, June 16, 2015 by george

pre-calculus 11
The question is the roundtrip flight from Edmonton to Toronto covers a distance of 5400km in 7.6 hours. The speed from Edmonton to Toronto was 95 km/h faster than the speed from Toronto to Edmonton. What was the speed of the plane from Toronto to Edmonton? If i set up my ...
Tuesday, June 16, 2015 by george

pre-calculus 11
-x/(x-3) + 2x/(x+2) (x-1) x (x-2) (x+2)/(x-3)(x-3) my question is should i multiply first and then do the adding or subtracting thru a LCD or should i do the adding first?
Tuesday, June 16, 2015 by george

pre-calculus 11
a launch window of 8:00 to 12:00. If t represents the launch time then what is an acceptable range of values for launch times? My thoughts are on this is that the scientist have a window of 4 hours which can include 8:00 and 12:00 but cannot exceed them. So time could be ...
Tuesday, June 16, 2015 by george

Calculus
On the closed interval, [0, 2*pi], find the absolute maximum of the function f(x)= sin^2(x)
Monday, June 15, 2015 by Alex

calculus
Find the distance, in feet, a particle travels in its first 4 seconds of travel, if it moves according to the velocity equation v(t)= −t2 + 4 (in feet/sec).
Monday, June 15, 2015 by Anonymous

calculus
A girls throws a tennis ball straight into the air with a velocity of 64 feet/sec. If acceleration due to gravity is −32 ft/sec2, how many seconds after it leaves the girl's hand will it take the ball to reach its highest point? Assume the position at time t = 0 is 0...
Monday, June 15, 2015 by Anonymous

Calculus
A ladder 30 ft. long is leaning up against a building. If the top of the ladder is being pulled up the wall of the building at a rate of 1.5 feet per minute, find the rate at which the base of the ladder is moving toward the building when it is 18 feet from the wall.
Monday, June 15, 2015 by Alex

pre-calculus 11
an object has a mass of m= 3x/4x^2 and density of d=x-1/2^2 where ve m/d and state any restrictions on the variable. So this simplifies to v=3x/2x-2 my question is the restriction i have found is x cannot be 1 which would make the denominator zero. Do I have to be concerned ...
Monday, June 15, 2015 by George

pre-calculus 11
I have the question y=-|x^2 -9| I am asked for the piecewise function. I have written y={-x^2 +9 if x less than equal to -3} { x^2 -9 if x is greater than equal to 3} I am wondering if I have my are signs backwards.My reasons for choosing the signs I have is if I plug a ...
Sunday, June 14, 2015 by george

pre-calculus 11
I am asked to solve the absolute value equation of |1/2x +1| =x+1 graphically. I can solve this algebraically and consider two cases for the absolute value one being positive and the other negative. I know this will be a straight line and when I solved it algebraically x=0 the...
Sunday, June 14, 2015 by george

Calculus
for a normal curve what percentage of values falls beyond two standard deviations from the mean
Sunday, June 14, 2015 by Jonah

Calculus
A strong swimmer is one mile off shore at point P. Assume that he swims at the rate of 3 mile per hour and walk at the rate of 5 miles per hour. If he swims in a straight line from P to R and then walks from R to Q, how far should R be from Q in order that he arrives at Q in ...
Saturday, June 13, 2015 by Selena

Calculus
A wire 17 inches long is cut into two pieces. One piece is bent to form a square and the other is bent to form a rectangle that is twice as wide as it is high. How should the wire be cut in order to minimize the total area of the square and rectangle?
Saturday, June 13, 2015 by Selena

Pre-Calculus
Can someone please help me with this question? Show that x=a cos t+h, y=b sin t+k; 0<t<2pi (greater than and EQUAL to) are parametric equations of an ellipse with center (h,k) and axes of lengths 2a and 2b. Thank you so much!
Saturday, June 13, 2015 by Anonymous

Calculus
Find the integral of x/cos^2(x^2)dx The answer is 1/2 tan (x^2) + C. Where does the 1/2 come from?
Thursday, June 11, 2015 by Anonymous

Pre Calculus
a biologist has three salt solutions: some 5% solution, some 15% solution, and some 25% solution. She needs to mix some of each to get 50 liters of 20% solution. She wants to use twice as much of the 5% solution as the 15% solution. How much of each solution should she use? I...
Wednesday, June 10, 2015 by Jaden

Calculus 1
The height (in meters) of a projectile shot vertically upward from a point 3 m above ground level with an initial velocity of 21.5 m/s is h = 3 + 21.5t − 4.9t2 after t seconds. (Round your answers to two decimal places.) a. When does it hit the ground? I set the equation...
Wednesday, June 10, 2015 by Laurel

Finite Math
Fifty percent of students enrolled in calculus class have previously taken pre-calculus. Thirty percent of these students received an A for the calculus class, whereas twenty percent of the other students received an A for calculus. Find the probability that a student selected...
Wednesday, June 10, 2015 by Nikole

pre-calculus 11
I have f(x) + 1/ x-c this is the question and I am told for the function with a vertical asymptote at x=1 Mr. Reimy was kind enough to provide this information comparing it to y = 1/x for the first interpretation the graph of y = 1/x would simply be translated vertically by c ...
Wednesday, June 10, 2015 by george

pre-calculus 11
I have the question what is the equation of the function in the form f(x) = 1/x-c for the function with a vertical asymptote at x=1? sketch the graph. I am uncertain how I plug this into a graphing calculator. Could I substitute 1 for x and then put an x in for c to input this...
Wednesday, June 10, 2015 by george

pre-calculus 11
I am asked to solve the absolute value equation of |1/2x +1| =x+1 graphically. I can solve this algebraically and consider two cases for the absolute value one being positive and the other negative. I know this will be a straight line and when I solved it algebraically x=0 the...
Wednesday, June 10, 2015 by george

pre-calculus 11
I have the question y=-|x^2 -9| I am asked for the piecewise function. I have written y={-x^2 +9 if x less than equal to -3} { x^2 -9 if x is greater than equal to 3} I am wondering if I have my are signs backwards.My reasons for choosing the signs I have is if I plug a ...
Wednesday, June 10, 2015 by george

Pre calculus/ Advanced Functions
Samuel is investigating the rate of change of the function f(x) = cos x on the interval xE[0, 2pi]. He notices that the graph of f(x) passes through the x-axis at pi/2. He also determines the instantaneous rate of change at x = 0, pi and 2pi by inspection. Based on this ...
Tuesday, June 9, 2015 by Anonymous

pre-calculus 11
abs x^2/2 -1 =x+3 solve algebraically so if I divide thru by 2 i get x^2 -2= 2x+3 simplifying x^2-2x-5 =0 solve by quadratic formula to get =3.449 and -0.445 both of which are extraneous roots if I take negative then I get -x^2 +2=2x+6 simplify to x^2 +2x +4 if taking using ...
Tuesday, June 9, 2015 by george

Calculus 1
True or false. Explain. The line x=1 is a vertical asymptote of f(x)=(x^2+x-2)/(x^2-1)
Tuesday, June 9, 2015 by TayB

Calculus
A manufacturer of a product has a monthly cost for producing x items given by C(x) = 10+2x. The selling price function for this product is p(x) = 50-.01x. Find the maximum profit the company can expect monthly
Monday, June 8, 2015 by Schaun

Calculus
An architect needs to design a rectangular room with an area of 77ft^2. What dimensions should he use in order to minimize the perimeter? I keep getting stuck on this problem. I know when I take square root of 77, it gives me 8.77. But how do I get there. xy= 77, y= 77/x P= 2x...
Sunday, June 7, 2015 by LittlePanda

Calculus
A rectangle is bounded by the x axis and the semicircle = square root 25-x^2. What length and width should the rectangle have so that its area is a maximum? When I worked the problem out(which is a bit detailed). I started with y = square root 25-x^2 then A = 2x square root 25...
Saturday, June 6, 2015 by LittlePanda

Calculus
Describe the solid whose volume is represented by the following definite integrals. The integral of 2pi(x-1)e^x from 2 to 7.
Friday, June 5, 2015 by Alex

Calculus
v(t)= t^3 - 3t^2 + 3t Are there any times after t = 0 where the particle comes to a stop? Does the particle ever slow down?
Wednesday, June 3, 2015 by Anonymous

calculus
Can I have a website of Beginner calculus books?
Tuesday, June 2, 2015 by ken

Calculus
An airplane has airspeed of 724 k/h at bearing of North 30 degrees East. If the wind velocity is 32 from west. find the ground speed and direction of plane. Teacher gives solution of 740.5 k/hr and 57.9 degrees. Can anyone show steps?
Monday, June 1, 2015 by Trey

Calculus
A(x) = x^2 + 128/x find A'(x) and A"(x)
Sunday, May 31, 2015 by Anonymous

math
Consider the distribution of mathematics SAT scores of students in honors calculus at a liberal arts college. What would you expect the shape and variation of the distribution to be? A. Symmetric with little variation B. Symmetric with large variation C. Skewed right with ...
Thursday, May 28, 2015 by scoobs2usa

Calculus
For f(x)=(1-x)/(1+x) and g(x)=x/(1-x) , find the simplified form for f [g(x)] and state the domain
Wednesday, May 27, 2015 by Tom

Calculus
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
Wednesday, May 27, 2015 by Tom

Calculus
at what time does this equation reaches 10000? show steps. thanks w(t)=(t-10)(t-20)+4500
Tuesday, May 26, 2015 by Reza

Calculus
A box with a square base and no top is to have a volume of 32 ft3. What dimensions use the least amount of material (in other words what dimensions give minimum outside surface area)?
Sunday, May 24, 2015 by Maddie

Calculus math
how do i solve these quadratics? c=10000 9a+3b+c=7975 36a+6b+c=6400 im unsure of how to solve as a and b are unknowns...
Thursday, May 21, 2015 by Dg

Calculus
Which of the following functions is continuous at x = 5? I put a for my answer, could someone please check this? a. f(x)=(x^2-25)/(x+5) b. (x^2-25)/(x-5), x cannot equal 5 20 when x equals 5 c.(x^2-25)/(x-5), x cannot equal 5 0 when x equals 5 d. all of the functions are ...
Thursday, May 21, 2015 by Tom

calculus
Peter the punter decided to place $10,000 into a high growth share portfolio. After 3 weeks his investment was looking rather sad, with the value of his portfolio falling $2,025. Unperturbed, Peter stuck with his original plan to hold the stock for at least 6 months. But after...
Thursday, May 21, 2015 by Roney

Calculus and quadratic equations
Peter the punter decided to place $10,000 into a high growth share portfolio. After 3 weeks his investment was looking rather sad, with the value of his portfolio falling $2,025. Unperturbed, Peter stuck with his original plan to hold the stock for at least 6 months. But after...
Wednesday, May 20, 2015 by Roney

Calculus
Which of the following statements is/are true? I.If f '(c) = 0, then f has a local maximum or minimum at x = c. II.If f is continuous on [a, b] and differentiable on (a, b) and f '(x) = 0 on (a, b), then f is constant on [a, b]. III.The Mean Value Theorem can be ...
Wednesday, May 20, 2015 by Tom

Calculus
The function's value will always be greater than or equal to the local linear approximation of a function f if, for all x in an interval containing the point of tangency, f " > 0 f " < 0 f ' > 0 f ' < 0
Wednesday, May 20, 2015 by Tom

Calculus
The function's value will always be greater than or equal to the local linear approximation of a function f if, for all x in an interval containing the point of tangency, f " > 0 f " < 0 f ' > 0 f ' < 0
Wednesday, May 20, 2015 by Tom

Calculus
(a) Consider the region in the xy-plane consisting of the points (x; y) satisfying x > 0, y > 0, and lying between the curves y = x^2 + 1, y = 2x^2 2 and the two axes. Draw a diagram of this region. (b) This region is rotated about the y-axis to form a solid glass vase. ...
Tuesday, May 19, 2015 by Yoyo

Calculus
If the integral from 0 to 8 of f(x)=4, then calculate the integral of f(4x) from 0 to 2.
Tuesday, May 19, 2015 by Yoyo

Calculus
Let f : R --> R be an odd function. Explain why, for any positive number a, the integral from -a to a of f(x) = 0.
Tuesday, May 19, 2015 by Jack

Calculus
The following definite integral gives the area of the region between the graph of the function f(x) = Icosx - x^2I (I=modulus), the x-asis, and the lines x=-2 and x=2. the integral of mod cosx - x^2 from -2 to 2. Describe a different region whose area is given by this integral...
Tuesday, May 19, 2015 by Alex

Calculus
Let f for all Real numbers, be an odd function. Explain why, for any positive number a, the integral from -a to a of f(x) = 0.
Tuesday, May 19, 2015 by Jim

Quadratic Functions and Calculus
Peter the punter decided to place $10,000 into a high growth share portfolio. After 3 weeks his investment was looking rather sad, with the value of his portfolio falling $2,025. Unperturbed, Peter stuck with his original plan to hold the stock for at least 6 months. But after...
Tuesday, May 19, 2015 by Roney

Calculus
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). I found the first and second derivative which i think is (8x+1)/(x^(2/3), and the ...
Monday, May 18, 2015 by Tom

Calculus
The position function of a particle in rectilinear motion is given by s(t) s(t) = t^3 - 9t^2 + 24t + 1 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.
Monday, May 18, 2015 by Tom

Calculus
Please check my answers. Solve the following equations and/or system of equations for the unknown variables. 1. x^2-3x-12=0 x= 3 + sqrt(57) / 2, x= 3 - sqrt(57) / 2 2. x+y=8 , 3x+2y=2 x=-14, y=22 3. 3x + 2y =10 , x+y=5 , y+z =9 x=0,y=5, z=4 4. 1/x-p1z=0, 1-p2z=0, I-p1x-p2y=0 ...
Monday, May 18, 2015 by John

Calculus
Given h(x)=(6x^2+x)/x , find h'(0)
Monday, May 18, 2015 by Fred

Calculus
If f(5) = 7, then lim f(x) ------------------x-> 5
Monday, May 18, 2015 by Andrew

Calculus
If f(5) = 7, then lim f(x) x-> 5
Monday, May 18, 2015 by Andrew

Calculus
I really need help with this calculus question. I ve been struggling to figure it out. Imagine making a tent in the shape of a right prism whose cross section is an equilateral triangle (the door is on one of the triangular ends). Assume we want the volume to be 2.6m^3, to ...
Sunday, May 17, 2015 by AG

Calculus 2
How would you find the following. A step by step process would greatly be appreciated. 1) Convert the polar equation to a rectangular equation. r^2 = 8sin2θ
Sunday, May 17, 2015 by Mira

calculus
velocity of a particle- the displacement s (in meters) of a particle moving in a straight line is given by the equation of motion s=4t^3+6t+2, where t is measured in seconds. Find the velocity of the particle s at times t=a t=1 t=2 t=3
Saturday, May 16, 2015 by Anonymous

calculus
velocity of a ball- if a ball is thrown into the air with a velocity of 40 ft/s, its height (in feet) after t seconds is given by y=40t-16t^2. find the velocity when t=2
Saturday, May 16, 2015 by Anonymous

calculus
find the derivative of the function at the given number F(x)= 1/ √x at 4
Saturday, May 16, 2015 by Anonymous

calculus
find an equation of the tangent line to the curve at the given point. graph the curve and the tangent line y=x/x-1 at (2,2) )
Saturday, May 16, 2015 by Anonymous

Calculus
Solve the following differential equation with initial conditions: y"=e^(-2t) + 10^(4t); y(0)=1, y'(0) = 0
Friday, May 15, 2015 by Pax

Calculus
Suppose a certain country's population has constant relative birth and death rates of 97 births per thousand people per year and 47 deaths per thousand people per year respectively. Assume also that approximately 30000 people emigrate (leave) from the country every year. ...
Friday, May 15, 2015 by Pax

Calculus
The table below shows the temperature (in °F) t hours after midnight in Phoenix on March 15. The table shows values of this function recorded every two hours. (10 points) a. Estimate the value of T'(6). Give units in your answer. b. What is the meaning of T'(6)? t ...
Friday, May 15, 2015 by Tom

Calculus
The slope of the line normal to the curve e^x − x^3 + y^2 =10 at the point (0, 3) is ____
Thursday, May 14, 2015 by Pax

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