99 points ( are these equations linear or nonlinear? 72=x3+y y+1=5(x−9) 7y + 2x = 12 4y = 24

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)?