Simplify 3 to the negative 8 times 3 to the 4th

What is the difference between the predicted value and the actual value

True or false look at the picture pls : /

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)?