Which method can be used to find the area of the composite shape

What is the celsius temperature that is equal to 94 degrees fahrenheit using the formula f=9/5 c+32

I'll give brainliest if you answer right : )

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.