Help me part 2 (fixed) Each square on a grid represents 1 unit on each side.
What is the slope of the line on graph D?

O -4

Step-by-step explanation:

As you can see, the line moves down (-4) and moves right (1)

Slope = rise/run = -4/1 = -4

-4

Step-by-step explanation:

Hope this helps (hint, rise/run)

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.