Last week Isabella had 30 dollars. She spent 6 dollars. What percent decrease in the amount of money she has? I'm not great at math word problems, so hopefully someone can help.

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.