A pole that is 25 feet tall casts a shadow 65 feet long. At the same time, another pole casts a shadow having a length of 39 feet. What is the height, in feet, of the second pole? (4 points)
10.5
14
15
41.7

Question

A pole that is 25 feet tall casts a shadow 65 feet long. At the same time, another pole casts a shadow having a length of 39 feet. What is the height, in feet, of the second pole?  (4 points)
10.5
14
15
41.7

mathmate · Answer

Use proportions   pole:shadow = pole:shadow
25:65 = x : 39
Are you familiar with cross multiplication?

anonymous · Answer

Somewhat..but not to well :(

phi · Answer

you can write the proportions as fractions
$$ \frac{25}{65} = \frac{x}{39} $$

what happens if you multiply both sides of the equation by 39 ?

mathmate · Answer

|dw:1357768633874:dw|