13. Gasoline costs $2.50 per gallon. If you have $30 in your wallet, do you have enough to buy 15 gallons of gas? Write an equation and prove your
answer. Show all work.

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)