Is the answer to converting repeating decimals to fractions 11/33 or 1/3???

To solve the system of equations below, pedro isolated the variable y in the first equation and then substituted it into the second equation. what was the resulting equation? { 5y=10x {x^2+y^2=36

1/2+1/6-3/4 simplify the given expression leaving the answer in improper fraction form.

Find the sum of the given arithmetic series. 24 + 17 + 10 + 3 + + (–39)