Find the surface area if the net 2.6m 3m 9m

Which choice represents the sample space ,s for this event

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9

In stepmber, daniel and justin opened a business. during their first three months of business, their average monthly profit was $51. if during their first month, they lost $29, and during their second month, they gained $115, what was their profit or loss for their third plzzz i will give you 299 points