book Maths Puzzle Numerical Ability

.1166meg ohms/ 1/.22meg ohms + 1/1meg ohms + 1/x
how do I solve for x?

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book Other Question

Im learning about factoring Trinomials by grouping and there is one problem I am having some trouble with. its 4r2(the 2 is the exponent) + 3r - 10 Suppose eight square have sides of length 1,1,2,3,4,5,6, and 9 inches. Is it possible to piece these tiles together to form a rectangle?