Which expression is equal to 4^5x 4^-7 divided by 4^-2

The graph of y = ax^2 + bx + c is a parabola that opens up and has a vertex at (0, 5). what is the solution set of the related equation 0 = ax%2 + bx + c?

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

Me i'm timed right now! there's 4 answer