Help me with this! Solve for x

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

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.

Adiverr from the university of florida women’s swimming and diving team is competing in the ncaa zone b championships