Explain why 90 is not a square number
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Answer:
Step-by-step explanation:
We have the following expression:
Which can be written as follows:
Multiplying the exponents:
Writing in radical form we finally have the result:
So the number of pencils bought can be represented by an equation: 
, where n is the number of notebooks bought. Since Helen bought 5 notebooks, simply plug 5 into n: 
. So Helen bought 12 pencils.