Hasan plans to choose a book from a section of the store where everything is 25% off. he writes the expression d−0.25d to find the sale price of the book if the original price is d dollars. bella correctly writes another expression, 0.75d , that will also find the sale price of the book if the original price is d dollars. use the drop-down menus to explain what each part of hasan's and bella's expressions mean.