Question

Help what’s the answer?

Answer 1

`1,4,5`

Explanation:

`\mathrm{The\ functions\ shown\ in\ options(1,4,5)\ have\ the\ whole\ number\ power\ to\ the}\\ \mathrm{ variable\ x.}\\\mathrm{While\ in\ option\ 3,\ the\ power\ of\ x\ in\ second\ term\ is\ -1,\ which\ is\ not\ a}\\\mathrm{whole\ number.\ And\ in\ option\ 2,\ the\ power\ of\ x\ in\ first\ term\ is\ (7)/(3),\ which}\\\mathrm{is\ also\ not\ a\ whole\ number.}`

If you are confused with 5th option, you may write f(x) = 7 as f(x)=7x^0 and 0 is the whole number.