Solve the problem.The annual depreciation rate r (0 < r < 1) of a car purchased for P dollars and worth A dollars after t years can be modeled by the following formula: 
Find the depreciation rate of a car that is purchased for $37,000 and is sold 5 years later for $15,000. Express your answer as a percentage, and round the answer to the nearest whole percentage.
A. 17%
B. 83%
C. -83%
D. -17%
Answer: A
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Determine which of the following methods is the best choice for solving the given equation: factoring, using the principle of square roots or using the quadratic formula. Then, solve the equation.7x2 + 10x + 2 = 0
A. Factoring; -5, 14
B. Quadratic formula; 
C. Square root principle; -10, 0
D. Square root principle or factoring; -7
Determine whether the given points are collinear. Select the correct answer.
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Solve the problem.An organization determines that the cost per person of chartering a bus is given by the formula 
where x is the number of people in the group and C(x) is in dollars. Find a formula for the inverse of this function.
A. C-1(x) = 
B. C-1(x) = 
C. C-1(x) = 
D. C-1(x) = 
Solve the equation.1.8 = 17.8 - x
A. x = 19.6 B. x = 15.5 C. x = 19.1 D. x = 16