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11-62.

A share of ABC stock was worth $60$ in 2005 and only worth $45$ in 2010.

1. Find the multiplier and the percent decrease.

Solve for $m: 60 · m^{5} = 45$

To find the percent decrease, divide the amount of the decrease by the starting value and convert to a percent.

2. Write an exponential function that models the value of the stock starting from 2005.

Use the general form of an exponential equation: $y = a · m^{x}$, where m is the multiplier found in part (a), and $a$ is the initial value.

3. Assuming that the decline in value continues at the same rate, use your answer to (b) to predict the value in 2020.

$25.28$