0.00684 has three significant figures
The product of 7.6 x 1.246321 has two significant figures.
28623 has five significant figures.
1.20000 x 10-19 has six significant figures. Trailing zeroes after a decimal point are considered significant. In scientific notation, only the numbers before the multiplication symbol are considered significant.
The answer is 6.060 mg
See below for a website on a sig fig calculator
Since you don't give the possible choices, I will give an example: 0.034 123 0.90 0.07003 The answer is 0.07003, which has 4 significant figures. 0.034 has 2. 123 has 3. 0.90 has 2.
The last one.
There are 3 significant figures in this number.
There are 6 significant figures in this number.
4.884 has four significant figures and 2.25 has three significant figures. 4.884 x 2.25 = 10.989 = 11.0 rounded to three significant figures. When multiplying or dividing, the result must have the same number of significant figures as the number in the problem with the fewest significant figures.
12.5912
There are 2 significant figures in this number.
1.200 has the greatest number of significant figures (four). 12000 has two significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.
That depends on how many significant figures you are talking about.If three significant figures then 700 is the largest that rounds to 700.If four significant figures are to be rounded to three significant figures then 700.4If five significant figures are to be rounded to three significant figures then 700.49If six significant figures are to be rounded to three significant figures then 700.499etc.
Three significant figures are in this number.
The number 805 has three significant figures.
If the conversion factor is exact, then the number of significant figures in the answer is the same as the number of significant figures in the original number.If the conversion factor is an approximation, then the number of significant figures in the result is the lesser of this number and the number of significant figures in the original number.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
There are six significant figures in this number (i.e. all the figures here are significant).
There are 3 significant figures in this number.
There are 4 significant figures in this number.
There are 4 significant figures in this number.
There are 3 significant figures in this number.
There are 2 significant figures in this number.