Does anyone know slope?

Perform the required operations on the following functions given: f(x)= 3-x; g(x)= -2x find g[f(x)]

Given this information, which expression must represent the value of b?

The marriott family bought a new apartment three years ago for $65,000. the apartment is now worth $86,515. assuming a steady rate of growth, what was the yearly rate of appreciation? what is the percent of the yearly rate of appreciation?