exam Maths Puzzle Numerical Ability

A triangle has sides 3x + 7, 4x - 9, and 5x + 6. Find the polynomial that represents its perimeter.

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exam Other Question
Find a(1) in a geometric series for which S(n) =189, r=1/2, and a(n)=3.

Thank you what is the ratio of 4 to 5 if the sum is 45