Which rates are equivalent to 25 miles per gallon?

150 miles/ 6 gallons

50 miles/ 1.5 gallons

100 miles/ 3.8 gallons

75 miles/ 3 gallons

The first and last one are equivalent to 25 miles per gallon.
(150miles / 6gallons) / 6 = 25miles / 1gallon
(75miles / 3gallons) / 3 = 25miles / 1gallon

I'm not sure exactly but my best guess would be 1/4

1.17+3.99a. you combine the terms with a to create 3.99 and the 1.17 stays because it has no like terms or a variable