Indicate what must be done to each side of the equation in order to isolate the variable.0.4x = 9
A. Divide by 4
B. Multiply by 9
C. Divide by 0.4
D. Divide by 
Answer: C
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Solve the proportion equation.
= 
A. 
B. 5
C. 
D. 16
Find the vertex, focus, and directrix of the parabola with the given equation.(y + 2)2 = 20(x + 3)
A. vertex: (-2, -3) focus: (3, -3) directrix: x = -7 B. vertex: (3, 2) focus: (8, 2) directrix: x = -2 C. vertex: (-3, -2) focus: (-8, -2) directrix: x = 2 D. vertex: (-3, -2) focus: (2, -2) directrix: x = -8
The graph of a function f is given. On the same axes, sketch the graph of f-1. 
A. 
B. 
Solve the problem.The formula C = 28d + 25 describes the total cost of renting a truck, where C is the total cost and d is the number of days the truck is rented. How many days can the truck be rented for $389?
A. 14 days B. 11 days C. 23 days D. 13 days