Calcule as seguintes potências: (-2) elevado a -2...?

Quero ajuda no dever..

"Calcule as seguintes potências"

a) (-2) elevado a -2

b) - (1/2) elevado a -4

c) (-3) elevado a -2

d) (0,999...) elevado a -3

Me ajudem?? Obrigada!

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