Answer:
15
Step-by-step explanation:
15 is not a prime number, but it is composite.
<u><em>8</em></u>, <em><u>6</u></em>, and <em><u>4</u></em>.
Eight plus six equals: 14
Then add four, and your get eighteen
<em>~Hope this helped :)</em>
I think that it would be 8 inches because to find the area of a triangle is base times height divided by two. So I just doubled the area and divided by 6.
I'm sorry if this is incorrect!
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