book Maths Puzzle Numerical Ability

A=1/2(B+b)h for b

P=3/4x-12

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book Other Question

If 3(4x+5(3.14))=P, then 6(8x+10(3.14))=

Please help me solve this problem. If you can, please show the work.
Thank You simplify the following equation
sqrt (x/3)^2 + (x/4)^2 =

Thanks Jay Dee