This is the full problem

An item is priced at 0' dollars. Write an algebraic expression for each situation described. (a) the cost of five of the items '51? ' x dollars (b) the cost of n of the items ' ' dollars (c) the cost of two of the items, along with $18.99 worth of other items ' ' dollars (d) the reduced price if the item is sold at 40% off ' ' dollars (e) your change if you pay for the item with two $20 bills ' ' dollars (f) the amount of tax on the item if the sales tax rate is 7% ' ' dollars