The discount off is $10, so the price would be 30 dollars
<span>A
−10 + 16 = 6
........................................................</span>
The formula of a square area is A = L²
so if A = 4x2 + 28x + 49, so the other length is <span>A. (2x + 7) feet
proof
L=</span>(2x + 7), L²= (2x + 7)² =4x2 + 28x + 49,
Yesterday's price of notebook = $3.45
Today's price of notebook = $3.20
We have to determine the percentage decrease in the cost of notebook.
Percentage decrease = (Decrease
Old price) 
So, percentage decrease = 
=
= 7.246%
= 7.25%
Therefore, there is 7.25% of decrease in the cost of the notebook.
Plz help me I have save Q I put 30 years