exam Maths Puzzle Numerical Ability

can someone please help me with this!!

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

the number of gallons in q quarts? How would i write an expression for this? I need help with three problems. The first one is X+2Y=1 and -2X+Y=-4. I have to solve the linear equation systems by graphing. The second problem is 3/4X+1/4Y=13/2 and X-3/4Y=13/2