Given CE is the perpendicular bisector of FG find following lengths

Evaluate the expression for the given value of the variable 7a - 4a for a =8

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

For the quadratic function [tex]y=(x+4)^2-1[/tex] , do the following: a) rewrite the function in the standard form, b) rewrite the function in intercept form, c) find the vertex, d) find the y-intercept, e) find the x-intercepts.