Highest common factor of 42,72,and 56

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

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.

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with