Use a calculator to find the approximate value of arccos(0.77). a: 50.35° b: 37.6° c: 39.65° d: 100.71°

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.