Express in scientific notation: 215,000,000

A. \(2.15 \times 10^8\)

B. \(21.5 \times 10^7\)

C. \(215 \times 10^6\)

D. \(215 \times 1,000,000\)

E. \(0.215 \times 10^9\)

2 ← 8 15 000 000 ​ ​ = 2.15000000 ⋅ 1 0 8 = 2.15 ⋅ 1 0 8 A n s w er : A
10\\\\C.\ 215\cdot10^6\to215 > 10\\\\D.\ 215\cdot1,000,000\to215 > 10\ and\ no\ 10^n\\\\E.\ 0.215\cdot10^9\to0.215 < 1"> sc i e n t i f i c n o t a t i o n : a ⋅ 1 0 n an d a ∈< 1 ; 10 ) ; n ∈ Z B . 21.5 ⋅ 1 0 7 → 21.5 > 10 C . 215 ⋅ 1 0 6 → 215 > 10 D . 215 ⋅ 1 , 000 , 000 → 215 > 10 an d n o 1 0 n E . 0.215 ⋅ 1 0 9 → 0.215 < 1

Answered by Anonymous | 2024-06-10

The number 215,000,000 in scientific notation is expressed as 2.15 × 1 0 8 . This form maintains the standard that the coefficient is between 1 and 10. Hence, the correct option is A.
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Answered by Anonymous | 2024-10-02