I need help which is the right answer

What is the missing constant term in the perfect square that starts with x^2 -20x

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

Can any one me with the answers to these questions asap?