The cross-sectional area of a water pipe is 5058 square inches. to the nearest tenth, what is the diameter of the pipe in inches?

Area of a circle = PI * radius^2
5,058 = PI * radius^2
radius^2 = 5,058 / PI
radius = square root ( 1610.0114043176 )
radius = 40.1249474058
diameter = 80.2498948116
diameter = 80.25 inches

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.