2. how does changing the skater's mass affect the potential energy of the skater?

What is the slope of the line that contains the points (-2,1) and (0,-3)

If a 36 inch yardstick casts a 21 foot shadow, how tall is a building whose shadow is 168 feet? what is the scale factor

Tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. how long would it take for his friend to paint this fence alone?