3^-1 = 1 over (3 to the power of 1) = 1/3, one third.
a minus power is the same as a normal power but with a 1 above it.
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One third is three ninths. So one ninth minus three ninths is minus two nights.
minus three fifths
Three fourths minus five tenths is one fourth.
1.75 or one and three quarters
3.