exam Maths Puzzle Numerical Ability

need steps and answer
Factor
x^2- 6x + 8

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exam Other Question

The combined resistance of two resistors R1 and R2 in a parallel circuit is given by the formula Rt = 1 over 1/R1 + 1/R2

simplify the formula.

Thanks! The planning department of Abstract Office Supplies has been asked to determine whether the company should introduce a new computer desk next year. The department estimates that $1