Help :p

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)