The initial value of an exponential function is 1.8. The rate of growth is 4.2%. Which models the value of the function, y, over time t?​

Can someone me with my hwplz(only the circled ones)

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?

Let x = a + bi and y = c + di and z = f + gi. which statements are true?