Could someone plz help fast thanks

(note i put the graph in so plz )the graph shows the amount of water that remains in a barrel after it begins to leak. the variable x represents the number of days that have passed since the barrel was filled, and y represents the number of gallons of water that remain in the barrel. what is the slope of the line

Is every rectangle is a parallelogram? true false

The heaviest 16% of all men in weight weigh more than how many pounds ?