Mar 05, 3:08:46 PM In APQR, the measure of R=90°, the measure of Q=7º, and PQ = 9.4 feet. Find the
length of QR to the nearest tenth of a foot.

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.