Integrals Qs

1. Evaluate the following integrals

A. f^2 0 (3x^3 –x^2 +2) dx this is (f) with subscript of 0 and (f) to the power of 2.

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B. f^1 0 (e^(2x)-x^2) dx this is (f) to the power of 1 and (f) with a subscript of 0

C. f (1/x+3)(dx)

2. In a test run, a new train travels along a straight-line track. Data obtained
From the speedometer, indicate that the velocity of the train at any time t can be
Described by the velocity function

V (t) =8t (0≤t≤30)

a. Find the position function of the train.
b. Find the position after 3 seconds. (Note: the train starts from the beginning
of the track so when t = 0, the integration constant, C = 0.)

3. The current circulation of a particular magazine is 3,000 copies per week. The
Editor projects a growth rate of

G (t) = 4+5t^2/3

Copies per week after t weeks.

a. Find the circulation function based on this projection.
b. Find the circulation in 2 years.

4. A company manufactures widgets. The daily marginal cost to produce x
Widgets is found to be

C’(x) = 0.000009x^2 – 0.009x + 8

(Measured in dollars per unit). The daily fixed costs are found to be $120.

a. Use this information to get a general cost function for producing widgets.
b. Find the total cost of producing the first 500 widgets.
c. If you sell the widgets for $25 each, how many will need to be sold before the
Company begins making a profit. (Hint: The revenue function is R(x) = $25x;

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