A cement sidewalk will be poured around the outside of a rectangular plot that is 13m by 20m. What will be thearea of the sidewalk if it is 1 meter wide?

Ithink it would be 160 people

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.