exam Maths Puzzle Numerical Ability

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

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exam Other Question

How many liters of an 11% alcohol solution should be mixed with 60 liters of a 5% alcohol solution to obtain a mixture that is 7% alcohol? Factor completely:
3x2 + 2x - 8