Evaluate S5 for 300 + 150 + 75 + … and select the correct answer below.

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.

Can someone check if i did this correct. it’s number 4 if you’re wondering.

The area of square garden is 300m squared. how long is the diagonal?