Find the slope of the line that passes through each pair of points (2, 2), (3, 1)

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)

Arestaurant chef made 1 1/2 jars of pasta sauce. each serving of pasta requires 1/2 of a jar of sauce. how many servings of pasta will the chef be able to prepare using the sauce?

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?