Hey, I need help! Please?

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

The volume of a box varies directly with its length if a box in the group has a length of 30inches and k=24 what is its volume

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