If f (x) = x2 - 4x² – 25x + 28 and f(7) = 0, then find all of the zeros of f(x)
algebraically.

Using the side-splitter theorem, daniel wrote a proportion for the segment formed by luke segment de. what is ec?

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

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?