Factor completely the expression X5-81x
A x(x4 -81)
B x(x2 +9)(x2-9)
C x(x + 3)'(x-3)
D x(x2 + 9)(x+3)(x - 3)

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.

A50% increase followed by 33 1/2% decrease

2x minus y equals 6, x plus y equals negative 3