How do i solve this equation 10ac - x / 11 = -3

Kevin and randy muise have a jar containing 78 coins, all of which are either quarters or nickels. the total value of the coins in the jar is $13.90. how many of each type of coin do they have?

Asquare parking lot has 6,400 square meters what is the length in meters

Qrst is a parallelogram. determine the measure of ∠q pls