you can use the slope of a line to find the measure of the acute angle that the line forms with any horizontal line. To the nearest tenth, find the measure of the acute angle that the line forms with a horizontal line.​

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.