During a clothing store's bargain days th eregular prise of a tshirt is discounted by $5 there is a state sales tax of 5% and the 5% sales tax is applied before the sale's tax is calculated
a: write an expression that shows the regular price of a t-shirt minus the $5 discount
b: write a rule for the function p(r) that expresses the final price p of a t-shirt with the discount applied and sales tax added
c: how much would you pay during bargain days for a shirt regularly at 15.50