What decimal is represented by the tick mark labeled p

Which statement justifies why angle ebc measures 90?

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)?

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air