Question

round 9.9999 to 3 significant figures​

Answer 1

Step-by-step explanation:

as by taking 3 significant figure

that is 9.99

now by taking round off of this significant figure

the answer would be 10.0

Answer 2

Given :  9.9999

To Find : 9.9999 round off to 3 significant figure

Solution:

9.9999

Has 5 significant figures

number to be rounded to 3 significant figures

9.9999 rounded

10.000   has  5 significant figures

10.00  has  4 significant figures

10.0  has  3  significant figures

Hence correct answer  is  10.0

9.9999 round off to 3 significant figure is 10.0

Significant figures  

All non-zero digits are significant.

The leftmost nonzero digit is the first or most significant figure.

If there is a decimal point, the rightmost digit is the last or least significant figure

If there is no decimal point explicitly shown, the rightmost non-zero digit is the least significant figure

All digits between the most significant figure and the least significant figure are significant.

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