The scale factor of two similar rectangular prisms is 3. The surface area of the smaller prism is 15 in?.
a. 100 in?
C. 75 in?
b. 135 in?
d. 90 in?

Pls! does anybody know a shortcut for answering these types of questions in the future?

Sarah took the advertising department from her company on a round trip to meet with a potential client. including sarah a total of 11 people took the trip. she was able to purchase coach tickets for $280 and first class tickets for $1280. she used her total budget for airfare for the trip, which was $6080. how many first class tickets did she buy? how many coach tickets did she buy?

Will mark brainliest! ( explain the answer too, it can be one sentence)