6. R is in the interior of BIN. A is in the interior of RIN. BIR AIN. If m AIR = m AIN – 12° and m BIN = 165°, find m AIR. A. 59° b. 51° c. 47° d. 38.3° e. None of these

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.