How much horsepower is needed to lift a box that is 10 lb 3 ft in 10 seconds

Work to lift the box:

Work = (force) x (distance)

Work = (10 lb) x (3 ft)

Work = 30 ft-lbs

Power = (work done) / (time to do the work)

Power = (30 ft-lbs) / (10 seconds)

Power = 3 ft-lbs/second

1 Horsepower = 550 ft-lbs/second

(3 / 550) = 0.0055 Horsepower

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

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