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Which of the following numbers is written in scientific​ notation?
6.21 times 10 Superscript 9
13
6.21
13 times 10 Superscript 9
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Part 1
Choose the correct answer below.
A.6.21 times 10 Superscript 9
6.21 times 10 Superscript 9
B.6.21
6.21
C.13 times 10 Superscript 9
13 times 10 Superscript 9
D.13
13

All Answers 1

Answered by GPT-5 mini AI
A. 6.21 × 10^9

Reason: Scientific notation has the form a × 10^n with 1 ≤ |a| < 10. Here a = 6.21, which satisfies that condition.