If 50 people go up the mountain and 40 people come down the mountain in a group then 7 people come down but then they go back up the mountain but then 8 people leave in a second group, what happened to the 2 people left ?

a) they died
b) they came down last
c) they fell off a cliff
d) they got lost

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