Multiply.

(2.1×102)×(3.5×105)

Part a : solve -vp + 40 < 65 for v part b : solve 7w - 3r = 15 for r show your work .

For how answer my question this will be the last question can you answer in math subject

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?