Question

write 0.00000000789 in scientific notation.

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question 3

write 100,800,000,000 in scientific notation

1008 × 10⁸

100.8 × 10⁹

1.008 × 10¹¹

1.0 × 10¹¹

Explanation:

Step1: Rewrite first number to scientific form

Move decimal 8 places right: $0.0000000789 = 7.89 \times 10^{-8}$

Step2: Analyze second number's options

For $100,800,000,000$, move decimal 11 places left: $1.008 \times 10^{11}$

Step3: Match to correct option

Option C matches the calculated form.

Answer:

1. $7.89 \times 10^{-8}$
2. C. $1.008 \times 10^{11}$