I need help with unit rates

As a self-employed seamstress, you know that it takes 7 yards of material to make 3 jackets. you bought 15 yards of material to make 7 jackets. did you buy enough material? if not, how much were you over or under?

P= price tax is 4% added to the price. which expression shows the total price including tax?

What is the answer to question 11? richard simplified an expression in three steps,as shown taking 04.10 segment one exam part one (flvs)