If we want to compute
, we have to substitute every occurrence of
with
in the definition of the function:

Similarly, computing
means to substitute the input with 2:

So, we have

And finally

9 people because you subtract 50 from 100 then divide 50 divided bt 5.50. its not a flat out number so you have to round down to 9.
The answer is 45 because it has to be multipled etc
1 gallon of gas for William= 37.76 ÷ 16= 2.36 $
1 gallon of gas for Regina= 14.64 ÷ 6= 2.44 $
so william got a better deal per gallon.