1 yard = 3 feet
1 mile = 5,280 feet
So, 1 mile = 5,280/3 yards = 1760 yards
It would take the faucet 18 hours to fill the tank because 18/12=1.5. That means it will be 1.5 times slower to fill the tank up with the hose on. 1.5*12=18.
Same as any other midpoint of line segment or two points, it is the average of the two points x and y coordinates...
mp=((x1+x2)/2, (y1+y2)/2)
mp=((-6+16)/2, (-9+5)/2)
mp=(10/2, -4/2)
mp=(5, -2)
4(-9*x)
Multiply the two numbers
-36x
Final answer: -36x