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## Homework Statement

The redshift of a galaxy is measured at the present epoch t0 and again at the infnitesimal future epoch t0 + δt0. Show that the rate of change of z with t0 is given by

[tex]\frac{dz}{dt_{o}}=(1+z)H_{o}-H(z)[/tex]

## Homework Equations

Hint - Start From:

[tex]\frac{\delta z}{\delta t_{o}}=\frac{\delta z}{\delta t_{o}}+\frac{\delta z}{\delta t}\frac{dt}{dt_{o}}[/tex]

## The Attempt at a Solution

Haven't a clue tbh. Don't even know where to begin :/