Solve the problem.A moving firm charges a flat fee of $45 plus $40 per hour. Let y be the cost in dollars of using the moving firm for x hours. Find the slope-intercept form of the equation.
A. y = 40x - 45
B. y = 45x - 40
C. y = 40x + 45
D. y = 45x + 40
Answer: C
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Evaluate the integral by changing the order of integration in an appropriate way.
A. 
B. 
C. 
D. 
Find the standard equation of a parabola with the given focus or directrix. Assume that the vertex is at the origin.Directrix y = 3?
A. y2 = -12?x B. x2 = -12?y C. x2 = -3?y D. y2 = 4?x
Solve the problem.Suppose that the radius r and the circumference C = 2?r of a circle are differentiable functions of t. Write an equation that relates dC/dt to dr/dt.
A. 
= 
B. 
= 2?
C. 
= 2?
D. 
= 2?r
Solve using matrices.John has a jarful of quarters and nickels. There are 93 coins in the jar. The value of the coins is $15.25. How many of each type of coin?
A. 58 quarters and 35 nickels B. 53 quarters and 40 nickels C. 40 quarters and 53 nickels D. 88 quarters and 5 nickels