Can u guys with these i don’t under stand

Very simple. Coordinate go like (x,y). x represents the amount of lines you move towards the right, and y represents the lines you go up. So, for example, Point A which is (2,6). All that you would need to go is from the far left of your grid, move 2 lines to the right, then six lines up (x = horizontal/flat line, like if you're like at a horizon and y = vertical/someone standing up, to remember)

B. 16is the absolute value

40-24 to 4: 740+24=class4=boys 7=gals =4: 7