When you sign up for a movie service, you get three free months of movies. then you are charged $15 per month to rent movies. if you pay $90, how many months of use do you get?

Nine months because you divide 90 by 15 and get six and then you add three for the free months for a total of nine

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)