Area is base x height divide by 2
6x13=78
78 divide by 2 is 39
I'd say B. but that's only because I divided the number of times he flipped the coin by the number of sides it has, 2, and came up with 246. The closest number on here to that is 231 or B. I hope I helped.
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You can just do the inverse operation. 39 divied by 10 = 3.9
so 3.9 *10 =39
hope it helped
