The average of these numbers is nine tenths,

, or .9, however you would like to put it.
X=700R+85Y
R= Number of Refrigerators
Y= Number of Years
Download the app photomath it will help you
Given:
Amount spent on 2 DVDs = $41.75
Sales tax = $3.15
Coupon = $1.00 off
To find:
The cost of each DVD.
Solution:
Let x be the cost of each DVD.
Then, cost of two DVDs = 2x
Amount spent of 2 DVDs = Cost of 2 DVDs + Sales tax - Coupon discount




Divide both sides by 2.


Therefore, the cost of each DVD is $19.8.