Plz help I’m stuck and I can’t answer

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

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

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)?