Question 7. Find M Please hurry :)

(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

100 points, hi, i’m not sure how to get the equation from the graph and table.

The tile along the edge of a triangular community pool needs to be replaced? ?