exam Maths Puzzle Numerical Ability

Given: segment AB is congruent to segment CB
segment DA is congruent to segment EC
prove: triangle AFC is isoceles

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exam Other Question

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. Factor the following trinomial completely

x^2-11x-60

thank you for any help i can help