Eighty-five percent of the students dressed up for spirit week. What fraction of the student body did NOT dress up for spirit we
ek?
2 answers:
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Notice that
so that
We have
so that
You might already know that
so from these formulas we get
If you don't know the formulas mentioned above:
- The first one should be obvious; if you add
copies of 1 together, you end up with
- The second one is easily derived: If
, then
, so that
or
.
- The third can be derived using a similar strategy to the one used here. Consider the expression
, and so on.