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-BARSIC- [3]
3 years ago
9

Find each sum difference or quotient express your answer in scientific notation

Mathematics
1 answer:
forsale [732]3 years ago
3 0
The\ scientific\ notation:a\cdot10^n\ where\ 1\leq a \ \textless \  10\ and\ n\in\mathbb{Z}\\\\8.\\3.4(10^{-4})+0.8(10^{-4})=(3.4+0.8)(10^{-4})=\boxed{4.2\cdot10^{-4}}\\\\9.\\8.7(10^{-2})-2.3(10^{-2})=(8.7-2.3)(10^{-2})=\boxed{6.4\cdot10^{-2}}\\\\10.\\6.3(10^5):1.5(10^{-3})=(6.3:1.5)(10^5:10^{-3})\\\\=4.2\cdot10^{5-(-3)}=\boxed{4.2\cdot10^8}
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