Math
posted by Aj .
How do i figure out this question?
There are two roads, one has a grade of 20% the other has an elevation of 15 degrees. Which road would be steeper?

Hmmm. What is the tangent of 15 degrees? is it greater than .20?

The 20% usually refers to the slope of the road.
But the slope of a line is the tangent of the angle it makes with a horizontal
so if tan Ø = ,2
Ø = 11.3°
so ...... 
If it takes 3.7 seconds for a sound to reach the bottom of the ocean how deep is the water