EXTRA POINTS ASAP find the 10th term of the geometric sequence 3,15,75...
What is the equation for the sequence and what calculation was necessary to find the nth term indicated.

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.

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

Having a hard time understanding this question (see attachment).