Multiply the numbers outside the square root together and the two square roots together to get a single term and simplify
You do not have any point labeled "H" in your diagram.
What I can tell you is that point "G" (where all 3 medians meet) is called a centroid.
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Along </span>each<span> median:</span>
the distance from EACH vertex to the centroid (point G) is TWICE the distance from the centroid to the side.
<span>CG = 2*GE AG = 2*GD BG = 2*GF
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Child=x
Adult=y
y=3x
5.2x+9.9y=767.8
5.2x+9.9(3x)=767.8
5.2x+29.7x=767.8
34.9x=767.8
x=22
2/5=4/10=12/30 1/3=10/30 12/30+10/30=22/30 22/30=11/15