Answer: [tex]46.44\times10^{11}[/tex]
Step-by-step explanation:
Given multiplication problem
[tex](6.45\times10^6)\cdot720,000[/tex]
Here, 720,000= [tex]7.2\times10^5[/tex]
Thus, the given problem becomes
[tex](6.45\times10^6)\cdot7.2\times10^5[/tex]
[tex]=6.45\times10^6\cdot7.2\times10^5\\=6.45\times7.2\times10^{6+5}..............[\text{by law of exponents }a^ma^n=a^{m+n}]\\=46.44\times10^{11}[/tex]
