Question 1121034
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Side length increased by 10%  -->  side length multiplied by 1.10, or 1.1.  (1+10% = 1+.10 = 1.10)<br>
If the side length gets multiplied by 1.1, the area (side length squared) gets multiplied by (1.1)^2 = 1.21 = 1+.21  -->  area gets increased by .21, or 21%.<br>
Answer C