- Do black holes have their mass at the event horizon?

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F(x)=((x+3)/(x-1)), evaluate (f(x)-f(1))/(x-1)? √17x+2 +√x+7 = 9 .....is there anyway to know how much solution will this equation have without solving it .options : -1/0/2/none sollution? How much empty space is there in a proton? What does engine light code po441 suggest? Find the sum of cos^2 x + cos^2 (x+1°) + cos^2 (x+2°) + ... + cos^2 (x+179°).?