What is ∑[100(−4)n−1] equal to?
4 is on top
n=1 on bottom

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?

Find the slope intercept form of (-3,6) and (3,-6)

Two sides of a right triangle measure 2 units and 4 units. what is the area of the square that shares a side with the third side of the triangle?