book Maths Puzzle Numerical Ability

Im need help for the Distributive Property!!! I need help despretely!!!
And...can u make it easy...my algebra teacher is not very bright!!!:)



Sincerely,

Im failing in A

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book Other Question

how much water must be added to 12 grams of 90% iodine solution to produce a 25% iodine solution? simplify the following equation
sqrt (x/3)^2 + (x/4)^2 =

Thanks Jay Dee