It takes one valve 5 hours to fill the tank
it takes one valve 6 hours to fill the tank
it takes another valve 10 hours to drain the tank
if all 3 valves are open at the same time how long does it take to fill the tank?

y-y1=4(x-x1)

step-by-step explanation:

this is point-slope form since you only have 4 as the slope it goes in place of m

hope this : )

to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart

ratio is 2 : 9

the answer is three

13.5 : 3