2479.6897
The best estimate is always the exact answer since it is always possible to improve upon any other estimate.
30.9655
31.8966
It is 3229.
What's "best" depends on what you are going to use this for. You can take a calculator and do the exact calculation. Or you can round the numbers in a way that makes it easy to do the calculations in your head.
20.3897
11.9%
1,040 as 29 + 11 = 40 then add 1,000
You need not estimate since all 4 sides of a square are congruent. The perimeter is 116 (or 29 * 4)
29 divided into 293.77 = 0.09871668311944719
4