Question

Simplify the expression write the answer in scientific notation (9×10^7)
(7×10^9)

Answer 1

`\text{The scientific notation}\ a\cdot10^k,\ \text{where}\ 1\leq a<10\ \text{and}\ k\in\mathbb{Z}.\\\\(9*10^7)(7*10^9)=(9*7)(10^7*10^9)=63*10^(7+9)=63*10^(16)\\\\=6.3*10*10^(16)=\boxed{6.3*10^(17)}\\\\\text{used}\ a^n\cdot a^m=a^(n+m)`