Which figures are not significant? * trailing zeros to the left of an invisible decimal point
leading zeros to the right of a decimal point
leading zeros to the left of a decimal point
all of the above
none of the above

leading zeroes to the left of a decimal point. and trailing zeros to the left of an invisible decimal point.

Explanation:

All nonzero digits are significant figures. Example: 713 has three significant figures. 18,991 has five significant figures.Zeros located between two nonzero digits are significant figures. Example: 505 has three significant figures. 17,009 has five significant figures.Zeros at the ends of numbers are only significant if there is a decimal point in the number. Example: 502.00 has five significant figures (5,0,2,0,0). 5020 has three significant figures (5,0,2) 100,000 has one significant figure (1)Zeros that come before the first nonzero digit are not significant. Example: 0.0007 has one significant figure (7). 0.0970 has three significant figures (9,7,0)