What is the next number in 76,69

There is an entrance to the computer room at point e which lies on ab and is 5 feet from point a. plot point e on the coordinate plane. find the distance from the entrance at point e to the printer at point e

Find an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).

Need solving this 2nd limit problem.