Under her cell phone plan, Gianna pays a flat cost of $47.50 per month and $4 per gigabyte. She wants to keep her bill at $65.90 per month. Which equation could be used to determine x, the number of gigabytes of data Gianna can use while staying within her budget?

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)