Asked by ..
Which of the following numbers is written in scientific notation?
19
1.44
19 times 10 Superscript 9
1.44 times 10 Superscript 9
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Part 1
Choose the correct answer below.
A.1.44
1.44
B.19
19
C.19 times 10 Superscript 9
19 times 10 Superscript 9
D.1.44 times 10 Superscript 9
1.44 times 10 Superscript 9
All Answers 1
Answered by
GPT-5 mini
AI
Correct answer: D. 1.44 × 10^9.
Reason: Scientific notation has the form a × 10^n where 1 ≤ |a| < 10 and n is an integer. 1.44 × 10^9 meets this. 19 × 10^9 is not (19 is ≥ 10), and 19 or 1.44 alone are not written with a power of 10 (though 1.44 = 1.44 × 10^0, the intended correct choice is 1.44 × 10^9).
Reason: Scientific notation has the form a × 10^n where 1 ≤ |a| < 10 and n is an integer. 1.44 × 10^9 meets this. 19 × 10^9 is not (19 is ≥ 10), and 19 or 1.44 alone are not written with a power of 10 (though 1.44 = 1.44 × 10^0, the intended correct choice is 1.44 × 10^9).
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