Fill in the blank. A surveyor measures the angle of elevation to a point on a mountain to be 15
The point on the mountain is horizontally 6 miles away from the surveyor.
The vertical change in elevation from the point where the surveyor is standing
to the point on the mountain is miles. (Round your answer to the
nearest hundredth of a mile.)

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.