Find an equation of the tangent line to the parabola at the given point
x2 = 7y, (5, 25/7)

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?

Ineed i been stuck on this question since yesterday

Abox holds 500 paperclips. after a week on the teacher's desk 239 paperclips remained. how many paperclips were used?