Does 2, 15, 17 form a right triangle

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

1) in triangle the, what is the measure of angle t (in degrees)? 2) in triangle bat, the measure of angle b is 66∘, and the measure of angle t is 77∘.what is the measure of the exterior angle at a (in degrees)?

Common binomial factor of 6x(3x+7)+5(3x+7)