Trevon and Jack are selling pies for a school fundraiser. Customers can buy apple pies and blackberry pies. Trevon sold 8 apple pies and 6 blackberry pies for a total of
$150. Jack sold 6 apple pies and 12 blackberry pies for a total of $210. What is the
cost each of one apple pie and one blackberry pie?

Each apple pie is $9.75 use that to determine the others.

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.