In Exercises 21-24, find the distance from point A to the given line. (See Example 5.)
21. A(-1,7), y = 3x
22. A(-9, -3), y = x - 6
23. A(15, -21), 5x + 2y = 4
24. Al -5,5), -x + 2y = 14

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.