Is the expression a12 a4 equivalent to a8 a8?

Given the sequence 7, 14, 28, 56, which expression shown would give the tenth term? a. 7^10 b. 7·2^10 c. 7·2^9

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

East black horse $0.25 total budget is $555 it'll cost $115 for other supplies about how many flyers do you think we can buy