Provide the proper response.If at the current production level the marginal cost of a company is zero; at a slightly decreased production level the marginal cost is positive; and at a slightly increased production level the production cost is negative; how should the company alter its production level?
A. The production level should be increased.
B. The production level should remain at its current level.
C. The production level should be decreased.
Answer: A
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Use the substitution formula to evaluate the integral.
A. 
B. 30
C. 15
D. - 
Simplify the expression.2 ? 23
A. 16 B. 8 C. 64 D. 256
Solve the problem.A rock is dropped into a lake causing a circular wave to form and move away from the point where the rock hit the water. At time t, in seconds after the rock hit the water, the radius of the circle is given by 
Let A(r) = ?r2 represent the area of a circle of radius r. Find and interpret 
A. (A?r)(t) = 4.9?t2; This function gives the area as a function of time. B. (A?r)(t) = 24.01?t2; This function gives the area as a function of time. C. (A?r)(t) = 4.9?t; This function gives the time as a function of area. D. (A?r)(t) = 24.01?t2; This function gives the time as a function of area.
Solve.Mary and her brother John collect foreign coins. Mary has three times the number of coins that John has. Together they have 120 foreign coins. Find how many coins Mary has.
A. 90 coins B. 84 coins C. 30 coins D. 18 coins