exam Maths Puzzle Numerical Ability

The width of a rectangular playground is 2x - 5 feet, and the length is 3x + 9 feet.Write a polynomial P(x) that represents the perimeter and then evaluate this perimeter polynomial if x is 4 feet.

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Please help me with this problem.

One third(1/3) of a stack of paper and a one (1) pound book will balance one fourth(1/4) of the stack of paper and 3 of the books - How much does half the stack of paper weigh?

Thanks for your help. problem is: solve for M if F= mv sq over r
I am unaware of how to go about solving this.