The function notation for expressing the number of liters in the tank V after t minutes will be [tex]\rm V(t)=500-20(t)[/tex].
Given,
The capacity of oil-tank is 500 litres.
The oil is drained at the constant rate of 20 liters per minute.
We have to express the number of liters in the tank V after t minutes.
Since the total capacity of tank is 500 litres, so we subtract number of litres drained from 500 litres.
Using function notation, after t minutes the volume remaining in the tank will be,
[tex]\rm V(t)=500-20(t)[/tex].
Thus the correct expression is [tex]\rm V(t)=500-20(t)[/tex].
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