How do u write an= 8+ (n - 1) (3) in function form

At 6 1/2 cents per pound of string beans how much does 7 pounds cost

22. catie is starting a babysitting business. she spent $26 to make signs to advertise. she charges an initial fee of $5 and then $3 for each hour of service. write and solve an inequality to find the number of hours she will have to babysit to make a profit. interpret the solution.!

Math i have no idea how to do a and b