F(x)=-x^2+3 pls help

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.

What does x = in this equation x+3+2x=x+5

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)