- Can it be proven or disporven that the universe is in a black hole?

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Find the sum to n terms of the series, 2+4(1/5)+6(1/5)²...,and deduce the sum to infinity.? A set of values has a mean of 250 and a standard deviation of 50. What value has a z-score of -2.4? Please HELP!!!!!! Two-digit natural numbers are formed, with replacement, from the digits 0 through 9. How many numbers are greater than 57? Let f(x) be a function satisfying f'(X)=f(x) and f(0)=2 then ∫f(X)/3+4f(x) dx is? In dimensions, If a measurement is 5.25x5.5 would 5.25 be the width or the height?