# math

heres what it says on the paper. Using proportions, you can calculate the dimensions of objects without having to measure them. solve the problems that follow...
heres the problem
=====================================
amy is 5 feet tall and casts a 4-foot shadow. the pine tree has an 8 foot shadow. how tall is the pine tree..????

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1. Here's the proportion:

Height is to shadow as height is to shadow. Let x represent the unknown -- the height of the tree.

5/4 = x/8

Cross multiply:

4x = 40

Solve for x.

x = 40/4
x = 10

The tree is 10 feet tall.

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