Find the real numbers x and y that make the equation true.
= 
+ 
A. x = 9, y = 
B. x = -3, y = - 
C. x = 9, y = - 
D. x = 9, y = 3
Answer: C
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A pitching machine throws 70% strikes and 30% balls. Five pitches will be thrown by the machine.What is the probability that the first three balls thrown by the machine will be balls and that the last two thrown will be strikes?
A. 0.2 B. 0.3 × 0.7 C. 0.33 × 0.72 D. 3 × 0.3 + 2 × 0.7 E. none of these
Write the equation of the line whose graph is shown.
A. y = x + 5 B. y = - x - 5 C. y = x - 5 D. y = - x + 5
Solve the problem.The charges for renting a moving van are $65 for the first 30 miles and $7 for each additional mile. Assume that a fraction of a mile is rounded up. Find a symbolic representation for a function f that computes the cost of driving the van x miles, where 
(Hint: express f as a piecewise-constant function.) Then, determine the cost of driving the van 98 miles.
A. f(x) = 
; $6846
B. f(x) = 
; $541
C. f(x) = 
; $961
D. f(x) = 
; $961
A certain firm's marginal cost, in dollars, for a product is 
, its marginal revenue, in dollars, is 
, and its total cost of production of 8 items is $900. Find the profit or loss at the
optimal level of production. Round your answer to the nearest dollar. ? A. $172 loss B. $172 profit C. $820 profit D. $820 loss E. $400 loss