PLEASE HELP I WILL GIVE BRAINLIEST

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

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)?

How many solutions does the nonlinear system of equations graphed below have?