Determine if the function f is an exponential function. If so, identify the base. If not, why not? F(x)=2^x+ 4

Solve 3x-18=2y and 5x-6y=6 by elimination show work

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?

What is the inverse of the function f(x) = 2x + 1?