Question 1171087
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The requested equation is


    V(t) = 180 - 25t  gallons,


where V(t) is the remained volume of water, t is the time in hours.


The formula says that the initial volume of water is 180 gallons (at t= 0)

and that 25 gallons is drained each hour.



To answer another question, make calculations ON YOUR OWN by substituting the value t= 4.5 hours to the formula.
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Happy calculations (!)