29. How many significant digits does 8400 mg
has?
a. 1
b. 2
C. 3
d. 4

30. Which of the following is NOT true in determining the number of significant digits?
a. All nonzero digits are significant
b. All zeros between two nonzero digits are not significant.
C. The ending zeros of a given measure are not significant.
d. All zeros to the right of a decimal point and to the left of the first nonzero digit
are not significant​