Equivalent expressions for 7x+2x+6y

Trent wants to buy 2 packs of trading cards for 3 dollars each. the trading card packs that trent normally buys tend to come in packs of 6, 10, 12, or 15 cards. after selecting 2 packs, trent found that the first pack of cards cost 25 cents per card, and the second pack cost 30 cents per card. trent uses this information to write the equations below in order to compare c, the number of cards in each pack.

Mr.walker is looking at the fundraiser totals for the last five years , how does the mean of the totals compare to the median?

Using only odd number for numerators write two different subtraction problems that have a difference of 3/4