A skateboard ramp is 21 feet long and has a 19 foot horizontal measure. To the nearest degree, what is the measure of the angle of elevation?

What’s your question.

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.