How many significant figures are in the measurement 0.023040 cm?

There are 5 significant figures in your measurement.
Significant digits are the digits following the two zeros at the start of your measurement.
- zeros in front of measurement don’t count as significant figures.
- however zeroes following real numbers count as significant digits.

23040 are significant.

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .