exam Maths Puzzle Numerical Ability

The ideal diameter of a steel reienforcement rod is 2.8 cm the actual diameter may vary from the ideal by at most 0.06 cm.Find the range of acceptable diameters for the rod.

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how do you solve using elimination and substitution..i have 29 problems to answer so this helps me umm here is the problem 2x-7y=8 and 3x-4y=-1 - How many months does it take for $1000 to grow to $1500 in an account paying 12% compounded monthly?