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

Mathematics

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Evaluate the integral by changing the order of integration in an appropriate way.

A.
B.
C.
D.

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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

Mathematics

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

Mathematics

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

Mathematics