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Answer: B 
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The rule being used here is
which is often used to simplify square roots.
Yes, they can Decimal places are the numbers after a decimal. So for instance: 3.28863, that would have more than one decimal place because .28863 is more than one decimal place.
I believe it is 3. since it touches the x-axis in three areas
We will have the following:
* If Kristin does not decrease the price of her cakes, her projected weekly revenue from cake sales will be $2500.
*If Kristin decreases the price of her cakes, her projected weekly revalue will be $2520.
*Kristin will obtain the same revenue if she sells the cakes for $24 or $21.