Jordan is starting to save $150 to buy a new phone. In December he saved $5. In January he plans on saving as twice as much as he did in December, for total savings, of $15 ($5+$10). If Jordan continues to save twice as much each month as he saved the previous month. In which month will his total savings be enough to buy the phone?

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?