What are the coordinates of the midpoint between the points (-1, 4) and (2,-5)?

Can someone me with this problem . show your work .

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)?

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