I need the answers to Numbers 1,2,3 and 4 please!!

Plz which expression is equivalent to the expression below?

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

Adam plans to choose a video game from the section of the store where everything is 75% off. he writes the expression d-0.75d to find the sale price of the game if the original price is d dollars. gena correctly writes another expression, 0.25d, that will also find the sale price of the game if the original price is d dollars. use the drop down menus to explain each part of adams and rena's expression