Ineed on this, i don't get it and i am confused, can someone me out with this question

Let f (x) = x e8x. find a formula for the nth derivative of f, where n is any positive integer. use x and n in your answer if needed. f (n)(x) =

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?

Ariel is working at a meat packing plant for 5 nights a week. her regular wage is $11 an hour. she earns tine and a half for any overtime hours. this week she worked 9 hours of over time .how much will ariel earn for overtime this week ?