Ahotel charges an intial check-in fee of 30$, plus 40$ for each day the room is booked. how many days must the room be booked for the average cost per day fall to $45?

Thats impossible. it will be at least 30 dollars. but one night is 40 dollars

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)