The function $C$ gives the estimated number of cephalopods in a certa…

Question

Prompt

The function

C

gives the estimated number of cephalopods in a certain area, where

t

is the number of months since a study began.

C (t) = 240 (\frac{53}{52})^{t - 15} + 7

. How many months after the study began was the number of cephalopods in the area estimated to be 247?