Compare the weights of the backpacks for the students in these three classes.

A bookstore has marked down the price for all the books in a certain series by 15%.
How much is the discount on a book that normally costs $18.00? (Round to the nearest cent.)
A bookstore has marked down the price for all the books in a certain series by 15%.
How much is the discount on a book that normally costs $18.00? (Round to the nearest cent.)
A bookstore has marked down the price for all the books in a certain series by 15%.
A book normally costs $18.00.
After the discount, how much would the book cost?(Round to the nearest cent.)
Match each expression on the left with an equivalent expression from the right.
Angles C and D are complementary. The ratio of the measure of Angle C to the measure of Angle D is 2:3.
Find the measure of each angle.