Answered

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[tex]2.1 \times 10^2[/tex] has how many significant digits?

A. 1
B. 2
C. 3
D. 4

Sagot :

GinnyAnswer
To determine the number of significant digits in the number [tex]\(2.1 \times 10^2\)[/tex], we follow these steps:

1. Identify the base part of the number: In scientific notation, such as [tex]\(2.1 \times 10^2\)[/tex], the base part is [tex]\(2.1\)[/tex].

2. Count the significant digits in the base: The number [tex]\(2.1\)[/tex] has two digits: '2' and '1'.

3. Ignore the power of ten: The exponent [tex]\(10^2\)[/tex] simply shifts the decimal place and does not affect the count of significant digits.

Therefore, the number [tex]\(2.1 \times 10^2\)[/tex] has 2 significant digits.
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