The measure of an angle is 3 what is the measure of a complementary angle

The measure of its complementary angle is 87 degrees. When two complimentary angles are added to each other they equal 90 degrees. 

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.