Answer
a) 6 significant figures is correct.
b) 6 significant figures is incorrect and it should be 3.
c) 5 significant figures is incorrect and it should be 7.
d) 4 significant figures is correct.
Work Step by Step
a) 895675 is a whole number and all digits are significant.
b) 0.000869 has only three significant figures because all of the zeros prior to the numbers are insignificant as there is no bar above the number to indicate significance.
c) 0.5672100 has 7 significant figures and not 5 because even the last two zeros which follow after the digits are significant as they are no before the digits.
d) $6.022 \times10^{23}$ has 4 significant figures as it's a decimal and the zero falls in between the other digits so all numbers are significant in this case.
