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Differentiation/graphs

I have two problems (well, one problem with three parts and another one): 1. (a) Let f(x)=ax^2+bx+c, a does not equal zero, be a quadratic polynomial. How many points of inflection does the graph of f have? (b)Let f(x)=ax^3+bx^2+cx+d, a does not equal zero, be a cubic polynomial. How many points of inflection does the graph of f have? (c) Suppose the function y=f(x) satisfies the equation dy/dx=ky(L-y), where k and L are positive constants. Show that the graph of f has a point of inflection at the point where y=L/2. 7. Let f(x)=c/x+x^2. Determine all values of the constant c such that f has a relative minimum, but no relative maximum.

Subject:

Math

Topic:

Calculus

Posting ID:

2081

OTA ID:

102827

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Compound Interest Problems

If the tuition at a certain college is determined to cost $ 32000 in 10 years, how large must a trust fund that pays 7.5% compounded continuously be, in order for a child on her 8th birthday to ensure sufficient funds at age 18?

Subject:

Math

Topic:

Calculus

Posting ID:

2089

OTA ID:

102846

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Evaluate an indefinite integral.

Evaluate the indefinite integral: (x^2+2x-3)/(x^4)

Subject:

Math

Topic:

Calculus

Posting ID:

2281

OTA ID:

101366

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Using the mean value theorem to prove the acceleration at a specific moment in time.

At 2:00 pm a car's speedometer reads 30 mi/h. At 2:10 pm it reads 50 mi/h. Use the mean value theorem to show that at some time between 2:00 and 2:10 the acceleration is exactly 120 mi/h^2. Please show line by line work and be as clear as possible.

Subject:

Math

Topic:

Calculus

Posting ID:

2283

OTA ID:

101298

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Maximizing the area of a rectangle.

Find the dimensions of the rectangle of the largest area that has its base on the x axis and its other two vertices above the x axis and lying on the parabola y=8-x^2.

Subject:

Math

Topic:

Calculus

Posting ID:

2284

OTA ID:

102833

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