3.141 in expanded notation is 3 + 0.1 + 0.04 + 0.001
Hope that helps :)
It depends on what the question is
Answer:
x = 19.42
Step-by-step explanation:
8²+x²=21²
64+x²=441
-64 -64
x²=377
x=19.41648784
rounded is 19.42
The answer is C
By the way, that expression means "n choose k". Hope I helped!