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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exam Other Question

Okay, the instructions say to Solve the Radical Equation...
6-√2x=-2
I know how to solve Radical Equations, but we were not told how to do ones that had a negative sign before the √. I really appreciate your help. Given: segment AB is congruent to segment CB
segment DA is congruent to segment EC
prove: triangle AFC is isoceles