exam Maths Puzzle Numerical Ability

The length of a rectangular playing field is 5 meters less than twice its width. if 230 meters of fencing goes around the field, find the dimensions of the field.

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exam Other Question

find the first five terms of the sequence in which a1=4 and an+1=3an+5, n is grater than or equal to 1.
i hope you can help
thanks a bunch! Tutor my problem is to multiply (x+2y)^4 is this 3 to the 4th power making it 19*9?? Would it be 3x3x3x3?

Thank you