Jack and Jill are looking at a 25-foot tree. Jack sees the top of the tree at an angle of elevation of 20º and Jill sees the top of the tree at an angle of elevation of 30°. How far apart are Jack and Jill?
(TWO DECIMAL PLACES)

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.

How much is 32 out of 40 written as a percentage? convert fraction (ratio) 32 / 40 answer:   80%