Combine like terms 9+ 12t -6t a.)9-12t b.) 21 c.) 21t d.)9+6t

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

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.

Find the dimensions of the circle. area = 64π in.² r= in.