Multiply.
? 
A. 
B. 10x
C. 21x
D. 
Answer: A
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Solve the problem.The perimeter of a rectangle is 16 cm. The length is 4 cm longer than the width. What are the length and width of the rectangle?
A. Length: 7 cm; width: 3 cm B. Length: 6 cm; width: 2 cm C. Length: 8 cm; width: 4 cm D. Length: 4 cm; width: 2 cm
Solve the problem.Juice comes in cylindrical cans of two sizes. The second can has twice the diameter of the first and is half as tall. Find the ratio of the amount of juice in the second can to the amount of juice in the first can.
A. 4 : 1 B. 2 : 1 C. 1 : 2 D. 1 : 1
In this problem, cost, revenue, and profit are in dollars and x is the number of units. Suppose that the total revenue function is given by 
, and that the total cost function is given by 
. Find the marginal
profit function.
?
A. 
B. 
C. 
D. 
E. 
Assume x and y are functions of t. Evaluate dy/dt.xy + x = 12; dx/dt = -3, x = 2, y = 5
A. 3 B. -9 C. -3 D. 9