Combine Different Function Types Practice Test

Let $f(x)=x^2+2$ and $g(x)=x-1$. Find $(f\cdot g)(x)$.

A lab models the temperature (in °C) of a cooling liquid as room temperature plus an exponential cooling term. Let $f(t)=22$ and $g(t)=15(0.8)^t$, where $t$ is in minutes. Find $(f+g)(t)$.​