Carlos' school is selling tickets to the annual talent show. On the first day of ticket sales the school sold 12 senior citizen tickets and 6 child tickets for a total of $102. The school took in
$159 on the second day by selling 9 senior citizen tickets and 12 child tickets. Find the price of a
senior citizen ticket and the price of a child ticket.

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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.