Assume a flat Friedmann-Robertson-Walker universe. Calculate the redshift z at which the temperature of the CMB was T = 10 T0, where T0 is the temperature of the CMB today. Assuming the universe was matter dominated throughout its evolution, calculate the

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Assume a flat Friedmann-Robertson-Walker universe.
Calculate the redshift z at which the temperature of the CMB was T = 10 T0, where T0 is the
temperature of the CMB today. Assuming the universe was matter dominated throughout its
evolution, calculate the time at which T = 10 T0 in Gigayears.

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