There are cosmological models which see our universe as a 4-dimensional sphere which expands in space-time. Assume the volume V = 7?r4, where r is in billion light years, increases at a rate of the universe increasing when the radius is 47 billion light years? dV = 1007²r². At what rate is the radius of dt

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Q: hello, i need the answer for the second question as well. thank you

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Q: ignore the question above please just do #7

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