exam Maths Puzzle Numerical Ability

8 radical 3 - 2 radical 2 + 3 radical 2 + 5 radical 3

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find the slope of the line that passes through each pair of points.
(1/2,2/3),(5/6,1/4) John and Ingrid pay 30% and 40% tax annually, respectively. If John makes $56,000 and Ingrid makes $72,000, what is their combined tax-rate?