20 POINTS need help asap no links plz

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

For each proportion find the unknown number x 1/5/8=×/15

Ihave trouble finding the nth term of a linear sequence