Answer:
<u>| </u><u>Music | World Language | Total </u><u> </u>
<u>8th grade</u><u> | 30 | 35 | 65 </u>
<u>7th grade</u><u> | 5 | 30 | 35 </u>
Total | 35 | 65 | 100
The answer is 5 planes - we count one for every side.
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I think it is 36^2+12ab+b^2
In order to get rid of the fractions, you need to multiply the equation by 12
