at the music store, the shelves hold bins of handbells. there are 7 shelves each shelf holds 3 bins each bin holds 5 handbells.
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Negative exponents work like this:
So, in order to evaluate a negative exponent, you simply have to invert the base, and then raise to the positive equivalent of the exponent.
As an example, here are the first three exercises:
You can work out the rest applying this logic.