What is the value of the function at x = 2?
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-2

Step-by-step explanation:

To evaluate a function when a graph of it is given, first you have to locate the point of your interest, in this case x = 2; then go up or down until you reach the line which represent the function, in this case the function is under the x-axis for x = 2,  so you go down; after that you have to go left ot right to find the corresponding y-value, that is, the function value, here you have to go to left to find y = -2.

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.