Can someone plz help its due soon

Me, the vertices of quadrilateral coat are c(2,0), o(7,0), a(7,2) and t(2,2). prove that coat is a rectangle.

Solve the equation: x - 9 = -6 + 5 a. 21 b. 7 c. 14 d. 2

D. in a discrete probability distribution, the sum of the probabilities for the discrete variables will be > 1. true or false