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the ideal mechanical advantage of a machine reflects the increase or decrease in force there world be without friction, it is always greater than the actual mechanical advantage because all machines must overcome friction.

Explanation:

Actual and ideal mechanical advantage, how to calculate them and the mechanical ... changes the input force when the machine is actually used in the real world. ... The ideal mechanical advantage is always greater than the actual mechanical advantage because all machines have to overcome friction.

because it says use -2,0,and 2 for x, we can plug those numbers into the equation. y/4=3/4(-2)+2   y/4= -1 1/2 +2 now to get x by itself, we can multiply each side by 4. y=-6+8 which equals y=2 when x=-2. now you can do the same thing with 0 and 2 as x. you get y=8 when x=0 and y=14 when x=2.

x   |   y

-2 |   2

0   |   8

2   |   14

because growing process had stoped after 4-5 year