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which expressions are monomials?
1. -4+6
2. b+2b+2
3. (x-2x)^2
4. rs/t
5. 36x^2yz^3
6. a^x
7. x^1/3

1, 4, 6 and 7. Mononomials are equations that only have one kind of number or value. Take number 2 for example. If you see b as a banana, and the number 2 as an apple, you can’t add the two together because they just don’t fit as equals. The answer to that equation gives you another polynomial (3b+2). Number 1 on the other hand, they’re both apples. Therefore you can add them together and get a sum of 2 apples (another mononomial)