Answer:
[tex]\huge\boxed{78,000,000,000=7.8\times10^{10}}[/tex]
Step-by-step explanation:
[tex]\text{The scientific notation:}\\\\a\times10^k\\\\\text{where}\ 1\leq a<10\ \text{and}\ k\in\mathbb{Z}\\\\=========================[/tex]
[tex]\text{We have:}\\\\78,000,000,000\Rightarrow7\underbrace{8,000,000,000}_{\leftarrow10}=7.8\times1\underbrace{0,000,000,000}_{10}=7.8\times10^{10}[/tex]
