A) (-2)2-21 B) 5-1+50-3-1 C) 3.10-2+5
\(A) \qquad (-2)^2 - 2^1=4-2=\boxed{2}\)
\(B) \qquad 5^{-1} + 5^0 - 3 - 1 = \frac{1}{5}+1-4=\boxed{-2.8}\)
\(C) \qquad (3.10)^{-2} + 5 = \frac{1}{(3.10)^2}+5 \approx \boxed{5.104}\)
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