Plz help me with the questions plz

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

Square a has a side length of (2x-7) and square b has a side length of (-4x+18). how much bigger is the perimeter of square b than square a?and show all work! you so

One side of a rectangle is 7 centimeters shorter than six times the other side. find the length of the longer side if we also know that the perimeter of the rectangle is 266 centimeters.