Answer
The distance between Venus and the sun is $ 0.7 $ astronomical unit.
Work Step by Step
The given formula is
$ d=\frac{3(2^{n-2})+4}{10} $
Where, $ d $ is measured in astronomical units and $ n $ is the number of planet from the sun.
Sustitute $ n=2 $ into the formula.
$ d=\frac{3(2^{2-2})+4}{10} $
$ d=\frac{3(2^{0})+4}{10} $
$ d=\frac{3 \cdot 1+4}{10} $
$ d=\frac{ 3+4}{10} $
$ d=\frac{ 7}{10} $
$ d=0.7 $.
