How would be there a line whose equation is of the form y=c , where c is a constant?

How can you decide witch operations to use to slice a two step equation

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.

The value of cos 30° is the same as which of the following?