book Maths Puzzle Numerical Ability

3x to the 2 power plus 7 subtract 8 plus 4x to the power 2

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book Other Question

The diagnolas of a rhombus are 12 and 24. Find the radius of the circle inscribed in the rhombus. I am trying to find the value of x in the following equation:

(x-y)/x=.3

Thanks for any help you can give.

Kathy