Jack wants to find the height of an olive tree for a science project. Jack is 2 meters tall. He stands 6 meters away from the tree, and his shadow is 4 meters long.

  D  4/10 = 2/x

Step-by-step explanation:

2/x represents the ratio of the man's height to the tree's height. The appropriate proportion will be one that ratios the man's shadow (4 m) to the tree's shadow (6+4=10 m).

The correct proportion is ...

  4/10 = 2/x

mrbilldoesmath!

answer: a parabola

steps:

(x-1)(x+4)   = x(x+4) - 1(x+4) = (x^2 + 4x) - (x+4)

                = x^2 +4x -x -4   = x^2 +3x -4

which is a parabola

mrb