What does 4x+12=13 is that the right equation

Bring the fraction a/a-4 to a denominator of 16-a^2

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.

Which of the following is an example of conditional probability