ASAP 50 POINTS !! (send help) please don’t troll or copy others

a) suppose that x^A • x^1/2 • x^1/4 • x^1/8= x, find the value of A

b) Express each of the following numbers as a power of 2.
4^3 ÷ 2^2=
1/2 • 8^50 =