3х - 7= 2х + 3 help !

Show algebraically that f and g are inverse functions f(x)=x^2/-6; g(x)=square root of 2x+12

Josh has a rewards card for a movie theater he receives 15 points for becoming a rewards card holder he earns 3.5 points for each visit to the movie theater he needs at least 55 points to earn a free movie ticket which inequality can josh use to determine x, the minimum number of visits he needs to earn his first free movie ticket.

Pranza plotted point a in the coordinate plane below.