Ineed with this question from ap calculus. the radicals are throwing me off. explain it to me! ?

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The coordinates of a, b, and c in the diagram are a(p,4), b(6,1), and c(9,q). which equation correctly relates p and q? hint: since is perpendicular to , the slope of × the slope of = -1. a. p - q = 7 b. q - p = 7 c. -q - p = 7 d. p + q = 7

On a piece of paper graph f(x)=5•(0.4)^x