37.5 gallons of milk, you welcome.
The one on the left is -5/6
The one on the right is 1/21
To evaluate a function at a given input, you have to substitute every occurrence of the variable with that particular value.
So, for the first function, you have

The name of the variable is obviously irrelelvant, so the same goes for the second function:

Divide 5 by 1.25. That equals 4. Multiply 4 by 20 and that equals 80. So its 80 miles between Longwood and Milltown.
The answer is 27.625 !
hope this helpss !!