Can someone help me with 103 please

What is the y intercept of f(x)=(1/2)^x?

In what organelle does photosynthesis take place?

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)?