Let's call he width of the notebook w and the length l
w*l=80
2(w+l)=36
w+l=18
w=18-l
(18-l)*l=80
-l^2+18*l-80=0
l=8 or 10
Therefore, the notebook is 8 by 10 inches
Answer:
The required equation in standard form is 
Step-by-step explanation:
The equation of a circle with center (h,k) an radius, r units is given by the formula;

The given circle has center (4,5) and the radius can be calculated from the given circumference, which is 


We substitute these values into the formula to obtain;

We simplify to get;

Answer:
8x - 1x
Step-by-step explanation:
Just do the stuff in the ()'s first, for this it's is 4x - 3x, then rewrite the problem and it is simplified