Answer:
B. Water is draining at a rate 720 gal/min
Step-by-step explanation:
We have the graph showing the relation between the number of gallons of water (y) and the number of hours (x).
Also, two co-ordinates expressing this relation are given by ( x,y ) = ( 0,10080 ) and ( 2,8640 ).
The rate of change of two co-ordinates and is .
So, using this formula, we will find the rate of change of the given relation.
i.e. Rate of change =
i.e. Rate of change =
i.e. Rate of change = -720
Thus, we see that the rate of change for this relation is -720.
Since, the rate of change is negative. This means that the water in the pool is decreasing at a rate of 720 gal/min.
Hence, we get that, 'Water is draining at a rate of 720 gal/min'.