exam Maths Puzzle Numerical Ability

(5x+75)^2=250

7(x^2+1)^1/2+28(x^2+1)^-1/2

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exam Other Question

write an equationof a circlewith the givencenter and radius. center(1,-5), radius 2.5 Two lines have slopes 2k-4 and k+6. What value(s) of k will produce perpendicular lines? I think the answer is k=-4+or- sqrt66/2????????