The number that missing is clearly 81
Answer:
Diameter=<em>22cm</em>
Then,
Radius=<em>22÷2=11cm</em>
Now,
Area of circle=<em>πr²</em>
Area =<em>3.14×11×11=</em><em><u>379.94sq.cm</u></em>
<em>hope</em><em> </em><em>helps~</em>
Well, it depends, due to significant number theorem - in addition - there is no need to round.
To find how much you save, you need to find out how much you pay for each tire. Your 2 equations are
2x=216 (x being the price of the tire, which you do not know)
x=108
4x=380
x=95
As you can see, the price of the tire from the manager's special is cheaper, but to find out by how much you subtract.
108-95=13
So you save $13 per tire.