Question 1196895
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(a)  To answer (a), substitute x= 30 into the given formula; then calculate.

     I sincerely hope that my help is not needed anymore in this step.



(b)  The inverse function is  y = {{{x/3.8}}},  converting liters x into gallons y.



(c)  To find the equivalent volume in gallons of 100-liter water, substitute x= 100 into my formula in (b);

     then calculate.
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Solved, &nbsp;explained, &nbsp;and you are fully instructed.