How do you solve 2 + (x+10) + 2 + (x+10)

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

Diana is painting statues she has 7/8 of a liter of paint each statue requires 1/20 of a liter of paint how many statues can she paint?

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1