How to change feet to centimeters and feet centimeters to gallons

-- To change a length in feet to the same length in centimeters,
you can multiply the number by  30.48 .

-- There is no such unit as foot-centimeter, and if there were, I guess
it would have to be a unit of area, not volume, so there would be no way
to convert it to an equivalent number of gallons..

Letter c i’d say