Solve the exponential equation.57x = 625
A. 
B. 1024
C. 
D. 625
Answer: C
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Solve the initial value problem for y as a function of x.x 
= 
, x ? 4, y(4) = 0
A. y = 4
B. y = 
- x + 4
C. y = 
D. y = 4 ln 
Solve.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 $31,000 and is sold 4 years later for $14,000. Express your answer as a percentage, and round the answer to the nearest whole percentage.
A. -18% B. 18% C. 82% D. -82%
Express the sum using summation notation. Use a lower limit of summation not necessarily 1 and k for the index of summation.3 + 
+ 4 + 
+ . . . + 
A. 
B. 
C. 
D. 
Simplify the given expression. Write the answer with variables in alphabetical order and any constant term last.8m2 + 13m - 12m2 + 4m
A. 4m2 - 17m
B. 4m2 + 17m
C. 
m2 + 17m
D. 
m2 - 17m