Suppose that you are 5 feet 3 inches tall and cast a shadow 10 feet 6 inches long. If you are standing nextto a tree that casts a shadow that is 52 feet long, about how tall is the tree?

Respuesta :

Let be "x" the height in feet of the tree.

First, we need to make the conversion from inches to feet. Since:

[tex]1\text{ ft=12 in}[/tex]

We have:

[tex]\begin{gathered} (3\text{ in)(}\frac{1\text{ ft}}{12\text{ in}})=0.25\text{ ft} \\ \\ (6\text{ in)(}\frac{1\text{ ft}}{12\text{ in}})=0.5\text{ ft} \end{gathered}[/tex]

Then your height is:

[tex]5\text{ ft+0.25 ft= 5.25 ft}[/tex]

And your shadow is:

[tex]10\text{ f+ 0.5 ft=10.5 ft}[/tex]

Knowing that, we can set up the following proportion:

[tex]\frac{5.25}{10.5}=\frac{x}{52}[/tex]

Solving for "x", we get:

[tex]\begin{gathered} (\frac{5.25}{10.5})(52)=x \\ x=\text{ 26} \end{gathered}[/tex]

Therefore, the height of the tree is about 26 feet.

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