* Which of the following statements describes mechanical advantage?
O a quantity that measures how much a machine multiplies velocity and mass.
O A quantity that measures how much a machine multiplies force or distance.
O a quantity that measures how much a machine multiplies mass.

Which of the following may one conclude from a map that shows the average ph value of rainfall in the u.s.? acid rain is a more serious problem on the east coast. acid rain falls equivalently across the continental u.s. there are more factories on the west coast. the midwest has fewer forests than the rest of the u.s.