Which exponential form is equivalent to a x a x a x b x b x b x b x b?

Whats the name of the vertical axis

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.

Find the axis symmetry of x y=4x-6x+3