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What is the correct way to write [tex]$1,550,000,000$[/tex] in scientific notation?

A. [tex]$1.55 \times 10^9$[/tex]
B. [tex]$1.55 \times 10^{10}$[/tex]
C. [tex]$15.5 \times 10^8$[/tex]
D. [tex]$15.5 \times 10^9$[/tex]

Answer :

To write [tex]$1,550,000,000 in scientific notation, we want to express it as a product of a number between 1 and 10, and a power of 10.

1. Start with the given number: 1,550,000,000.
2. Identify where the decimal point would be in the number: it's at the end of the number initially because it's a whole number (i.e., 1,550,000,000.0).
3. Move the decimal point to the left until there is only one non-zero digit to the left of it.

For 1,550,000,000, move the decimal point 9 places to the left:
- This gives us 1.55 (since the number becomes 1.55 when you move the decimal point 9 places to the left).

4. Count how many places you moved the decimal point: 9 places.

5. The scientific notation is written as:
\[
1.55 \times 10^9
\]

Therefore, the correct way to write $[/tex]1,550,000,000$ in scientific notation is [tex]\(1.55 \times 10^9\)[/tex].

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