How to find the rate in a power function

The equation can be written in the form f(x) = a(1 + r)x or f(x) = abx where b = 1 + r. a is the initial or starting value of the function, r is the percent growth or decay rate, written as a decimal, b is the growth factor or growth multiplier.

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if you was gonna solve for a, a is a   < -12

i think the length is 12 and the width is 17