Plz do 19-28 questions plz, and inlarge pic

27 prime factors: 9*3   prime factors of 9: 3*3
117 prime factors: 39*3  prime factors of 39: 13*3

that would make 3 the greatest common factor.  for the other ones break down the numbers into the smallest amount and see which largest factor both numbers have in common.
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Find the perimeter of the figure shown above with a side length 5 units.(each figure is a square).a.10 unitsc.30 unitsb.20 unitsd.40 units select the best answer from the choices providedabcdmark this and return

now i kniw my abcs next time wont u sing with me