ok so i know this might be a dumb question but 18 + what = 45. for some reason just cant figure it out :) so pls help.

—the graph shows how fast a strand of human hair grows. how many inches would the hair have grown in 5 months

How to write four times a number,minus 6,is equal to theee times the number+8 as an equqtion

Aschool allots ? 1500 to spend on a trip to the theatre. theatre tickets have a regular cost of ? 55 each and are on offer for 1 5 off. a train ticket for the day will cost ? 12 each. if 2 teachers and the maximum number of students attend, how much money will the school have left over?