Doug C.

College Algebra Word Problems

12/25/15

i drove from home to work at 30 mph. after work traffic was heavier and drove home at 25 mph. my driving time to and from work was 1 hour and 6 minutes. how far

do i live from work?

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Function

12/25/15

Evaluate the function

Evaluate the function f(x)=x^2-2x for the given value of X f(c+2)=

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Math Precalculus Trigonometry

12/21/15

Please prove that cot A + cot B + cot C = (a^2 + b^2 + c^2)/(4(area of triangle ABC)).

I need help with this proof. Please help me.

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Other

12/20/15

A truck has 8100 gal of gas. The station has 400 gal of gas in its tank. After the truck fills the station's tank is has 4 times as much gas as the station. How much gas did it take to fill the... more

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Math Calculus

12/18/15

A piece of wire 10 m long is cut into two pieces. One piece is bent into a square and the other is bent into an equilateral triangle. How should the wire be cut

A piece of wire 10 m long is cut into two pieces. One piece is bent into a square and the other is bent into an equilateral triangle. How should the wire be cut so that the total area enclosed is... more

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Calculus

12/18/15

4914: A gasoline

A gasoline tank has the shape of an inverted right circular cone with base radius 4 meters and height 5 meters. Gasoline is being pumped into the tank at the rate of 8 meters3/sec. Find the rate,... more

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Calculus

12/18/15

4096: Solve this problem algebraically

Solve this problem algebraically, using your knowledge of derivatives. Do not solve by graphing.If 200 feet of fencing is used to enclose a rectangular plot of land that borders a river, what is... more

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Answers •1

Calculus

12/18/15

4092: Use the second derivative test to find the relative extrema

Use the second derivative test to find the relative extrema for f(x) = x4 - 8x2 - 4. Minimum at (2, -20); maximum at (0, -4) Minimum at (-2, -20); maximum at (2, -20) Minimum at (2, -20) and... more

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Math Calculus

12/17/15

Suppose that f is a positive, concave up function on I and g is concave down on I. What is the concavity of 3(f(x))^2 -? 2g(x) on I?

Suppose that f is a positive, concave up function on I and g is concave down on I. What is the concavity of 3(f(x))2 - 2g(x) on I? ANSWER: concave up #13, prac test

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Math Calculus

12/16/15

What are the intervals of increasing and decreasing, and the intervals of concavity of the following?

What are the intervals of increasing and decreasing, the local min and max and the intervals of concavity of the following? y = exsin(x) -pi ≤ x ≤ pi I know I need the first derivative,... more

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Math Calculus

12/15/15

Find the limit. Use l’Hospital’s Rule where appropriate. If there is a more elementary method, consider using it. If l’Hospital’s Rule doesn’t apply, explain wh

Find the limit. Use l’Hospital’s Rule where appropriate. If there is a more elementary method, consider using it. If l’Hospital’sRule doesn’t apply, explain why. lim (x --> 0) [ √(1 + 2x)... more

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Word Problems Algebra Word Problems

12/15/15

help me please

The credit remaining on a phone card (in dollars) is a linear function of the total calling time made with the card (in minutes). The remaining credit after 30 minutes of calls is $15.20, and the... more

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Precalculus

12/13/15

Form a polynomial function with the given zeros

Zeros: -4,2+i

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College Algebra Word Problem

12/13/15

find three consecutive odd intergers such that the product of the first two equals two more than the square of the largest number.

Having trouble setting up

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Answers •2

Word Problem

12/11/15

Find three consecutive positive integers such that the product of the first and third, minus the second, is 1 more than 3 times the third

Find three consecutive positive integers such that the product of the first and third, minus the second, is 1 more than 3 times the third.

Use logarithmic differentiation: (x2 + 2)2 * (x4 + 4)4 ANSWER: (x2 + 2)2 * (x 4+ 4)4 * [4x / (x2 + 2) + 16x3 / (x4 + 4)] #39, p223

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Answers •1

i drove from home to work at 30 mph. after work traffic was heavier and drove home at 25 mph. my driving time to and from work was 1 hour and 6 minutes. how far

Evaluate the function

Please prove that cot A + cot B + cot C = (a^2 + b^2 + c^2)/(4(area of triangle ABC)).

Word Problem Help

A piece of wire 10 m long is cut into two pieces. One piece is bent into a square and the other is bent into an equilateral triangle. How should the wire be cut

4914: A gasoline

4096: Solve this problem algebraically

4092: Use the second derivative test to find the relative extrema

Suppose that f is a positive, concave up function on I and g is concave down on I. What is the concavity of 3(f(x))^2 -? 2g(x) on I?

What are the intervals of increasing and decreasing, and the intervals of concavity of the following?

Find the limit. Use l’Hospital’s Rule where appropriate. If there is a more elementary method, consider using it. If l’Hospital’s Rule doesn’t apply, explain wh

help me please

Form a polynomial function with the given zeros

find three consecutive odd intergers such that the product of the first two equals two more than the square of the largest number.

Find three consecutive positive integers such that the product of the first and third, minus the second, is 1 more than 3 times the third

Leah has 28 more marbles than Dan. 1/3 of Leah’s marbles is equal to 4/5 of Dan’s marbles. Find the amount of Leah’s marbles.

Find the inverse of y=log9x

Use implicit differentiation to find an equation of the tangent line to the curve at the given point

Find the derivative. Simplify where possible. y = cosh ^-1 (x^1/2)

A camera is 2000 ft. from the lauch pad of a rocket. The height of the rocket is given by h(t) = 50t^2 . What is the rate of change of the angle of elevation o

2. Lemniscate Curve, Find the exact coordinates of the point(s) where the tangent line to this curve is horizontal

Rational Zeros Question: Please help!

Use logarithmic differentiation to find the derivative of the function : y = [(x - 1) / (x^4 + 1]^1/2

Evalute the definite integral below.

Use logarithmic differentiation: (x^2 + 2)^2 * (x^4 + 4^4

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