20 is the greatest common factor
Each group of 20 will have 1 brownie & 5 cookies
12/3=4
4*15=60
60*(9)=540
540+3=543
Your answer would be: -3x2 + 3x - 6.
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The vertical angles have equal measures.
Therefore, if ∠ a and ∠b are vertical angles, then m∠a = m∠b.
Answer: m∠b = 115°