posted by Ashley on .
In traveling across flat land, you notice a mountain in front of you. Its angle of elevation to the peak is 3.5 degrees. After you drive 13 miles closer to the mountain, the angle of elevation is 9 degrees. Approximate the height of the mountain.
Let the second observation be taken at x miles from the mountain.
xtan(9°) = (13+x)tan(3.5°)
Solve for x after substituting the trig. ratios.
The height of the mountain is therefore
=5280 x tan(9°) ft.
How do you figure it out from there though? Because I got that far and couldn't figure out how to solve for x.
It's like solving for x in