The food truck Guac and Roll is selling tacos (t) for $2.00 and burritos (b) for $3.50. A competing truck, Nacho Business, sells both tacos
and burritos for $3.00 a piece. If Guac and Roll made $855 in one day and
Nacho Business made $990, but they both sold the same amount of tacos
and burritos, how many of each did they sell?

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.