ADVANTE BEGINS TO EVALUATE THE EXPRESSION 3 1/3 X 5 1/4 USING THE STEPS BELOW. WHICH COULD BE HIS NEXT STEPS

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?

If f(x) = 6x – 4, what is f(x) when x = 8? a2 b16 c44 d52

Answer asap and if you do you will get brainliest. catherine buys a gallon of ice cream from the store. after taking it home, she eats a fifth of a gallon of ice cream. her sister eats some of the ice cream as well. if two-thirds of the original amount of ice cream is left, then what fraction of a gallon of ice cream did her sister eat?