If 2^a=√64 and b/a =3 evaluate a^2+b^2

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9

Asap! i'm not good math and i'm lost.

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?