A cylinder with a radius of 6cm and height of 15 cm has a cylindrical cut out of the middle of it with a radius of 5 cm. Find the volume of the cylinder that remains, rounded to the nearest whole number.

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.