In a library, there are 12 books in each of the 4 shelves but then Jamie takes away 3 books. Choose the correct expression and evaluation

Select the quadratic that has root x = 8 and x = -5

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)?

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.