11. A contractor uses 203,881 kilograms of concrete to build the foundation of a house. The concrete has a density of 1.5 grams per cubic centimeter and
costs $90 per cubic yard. What is the total cost of the concrete used to build
the foundation?

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.