Please help, I have been stuck on this for 10 minutes.

Answer:
[tex]2.95 \times {10}^{6} \: sq \: miles = 2.15 \times {10}^{7} \: people \\ 1 \: sq \: mile = ( \frac{1}{2.95 \times {10}^{6} } \times 2.15 \times {10}^{7} ) \: people \\ = 7.288 \: people \\ = 7 \: people \: per \: sq \: mile[/tex]