Are -1 and 1 like terms?

yes, they are like terms

Step-by-step explanation:

This is since they do not have a variable. Examples: 7x and 2x are like terms because they are both "x". 3x2 and −2x2 are like terms because they are both "x2". But 7x and 7x2 are NOT like terms (the exponents are different), they are unlike terms.

Yes they are

c. 4 and 1/2 pounds is the answer! : )

i think this could be a possible answer (1 / 84) -1

good luck! : d