Henry's calculator is 2 1⁄4 inches wide and 5 1⁄4 inches long. What is the area of the calculator?

I just don't understand how to do this
so please help me

Adam drew two same size rectangles and divided them into the same number of equal parts. he shaded 1/3 of one rectangle and 1/4 of the other rectangle. what is the least number of parts into which both rectangles could be divided into?

The distance between two cities is 368 miles. if the scale on the map is 1/4 inch=23 miles, what is the distance between the cities on the map?

How do you solving the solution of each system using elimination?