Answer:
[tex]\large\boxed{2.128\times10^9}[/tex]
Step-by-step explanation:
The scientific notation:
[tex]a\cdot10^k\\\\1\leq a<10,\ k\in\mathbb{Z}[/tex]
We have:
[tex]21.8\times10^8[/tex]
21.8 >10
21.8 = 2.18 × 10
Thereofre:
[tex]21.8\times10^8=2.18\times10\times10^8[/tex]
Use
[tex]a^n\cdot a^m=a^{n+m}[/tex]
[tex]21.8\times10^8=2.18\times10^1\times10^8=2.18\times10^{1+8}=2.18\times10^9[/tex]
