Problem help needed algebra

Question

A large watering tank on a ranch holds 500 gallons of water when it is full.At time x=0, the tank is full but an angry stallion has kicked a hole in it. The water begins leaking out at a constant rate of 16 gallons per minute. Let f(x) be the number of gallons in the tank after x minutes.

-Write the equation of a linear model using function notation

-Find and interpret f(15)

-Find the x intercept by finding x when f(x)=0. Interpret its meaning in this situation

Answer 1

f(x) = 500 - 16x

f(15) = 500 - 16(15)

f(0) = 500 - 16(0)