When it has a slope of 3 it means y=3x+k Given the condition that f(-2)=0 So,replace the y with 0 and x with -2 0=3*-2+k 0=-6+k k=6 So the line is y=3x+6 when f(p)=3, 3x+6=3 3x=-3 X=-1 So, p=-1
Divide the volume of the tank (10,000 gallons) by the filling rate of 250 gallons/minute and you will Hours = hr x min x 3785 ml x 55 gal = 208175 = 115.6 hrs.
