3 to the power of -3 times 10 to the power of -3

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?

Ineed big ! the cost of a school banquet is $25 plus $15 for each person attending. create a table, sketch the graph, and write an equation in slope-intercept and point-slope form that gives total cost as a function of the number of people attending. what is the cost for 77 people?

Pls never taught i’m really confused and i rlly need