13.7cm
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since one inch approximately equals to 2.54cm, therefore 78cm is app. equal to 30.708 inches
When the sum of a number plus 3 is squared, it is 11 more than the sum of the number plus 2 when squared.
the sum of 70 + 30 = 100
the sum of -14 + 29 is 15
figure it out.