- Find the arc length of the curve y=1/8(−x^2+8ln(x)) from x=2 to x=8?

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A pair of dice are tossed. What is the probability that doubles are rolled, given that the sum on the two dice is less than 8? Please help. 3x^3-x^2-5x+7=0(mod 11),
find all possible x.? Why is it that lightbulbs have to be replaced, but the light sources in televisions and laptop screens never need replacing? When was sound proof plastic material first made? I set higher goals than those with whom I work.?