Question

9x10^7 x 7x10^9

Answer 1

\[9 \times 10^7 \times 7 \times 10^9\]

Answer 2

I'll change the order,\[9 \times 7 \times 10^7 \times 10^9\]\[63 \times 10^7 \times 10^9\]
\[Let's~~~see:~~~~10^7 \times 10^9=10^{7+9}=10^{16}\]

\[63 \times 10^{13}\]GET YOUR CALCULATOR OUT.