We will use formula for circumference of circle:
lets name it as O
O = 2*r * pi
when we express r in this formula we get:
O = 2*2.2*pi
O = 4.4*pi
From this we can see that for given radius, answer is 4.4. The formula only depends on pi and that is what "in terms of pi" means.
For the first question, x = 4
Add them all together and divide by the number of variables here there are four and the answer is 1.25 or 5/4
4000.0093979 = 63.2456275
-15999998
= 8.7
Then you get 50
10 is a common factor of 50 30 and 100. So is 2