Circle Area = PI * radius^2
radius = 2.1
Circle Area = 3.14 * 2.1^2
Circle Area =
<span>
<span>
<span>
13.8
</span></span></span>
Answer:

![\rule[225]{225}{2}](https://tex.z-dn.net/?f=%5Crule%5B225%5D%7B225%7D%7B2%7D)
Step-by-step explanation:
A pair of factors are two factors of a number, when multiplied, gives the number.


The pairs 3, 12 and 4, 9 are factor pairs of 36.
![\rule[225]{225}{2}](https://tex.z-dn.net/?f=%5Crule%5B225%5D%7B225%7D%7B2%7D)
31. I'm not positive but give it a shot if it is wrong message me back!