Question

Adam plans to choose a video game from a section of the store where everything is 75%

75
%
off. He writes the expression −0.75
d
-
0
.
75
d
to find the sale price of the game if the original price is
d
dollars.

Rena correctly writes another expression, 0.25
0
.
25
d
, that will also find the sale price of the game if the original price is
d
dollars.

Use the drop-down menus to explain what each part of Adam's and Rena's expressions mean

Answer 1

Look below

Explanation:

In Adam's expression, d represents the original price of the game. 0.75d represents 75% of the original price; this is the amount of the discount, since everything is 75% off. Taking the difference of the original price and the discount, d-0.75d, gives us the total price of the game. In Rena's expression, 0.25 represents 25%. This is because taking 75% off of the price means we still pay 100-75 = 25% of the original price. Multiplying the original price, d, by the 0.25, gives us 25% of the original price; this is the total price.