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Review: Fractions, Decimals and Denominators
Explanation
To make sense of the denominator, we need either both
fractions or both decimals. Fractions will be faster. The number 2.5 is 
,
which is 
,
which is 
.
Therefore, we have
This last step is why it was easier to convert to
fractions: because we can flip it (aka. multiply both the top and bottom by the
inverse of the fraction) to get a proper fraction.
Our final fraction is equal to -0.8, so the correct answer
is (A).
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