Answer
a. 1
b. 3
c. 2
d. 5
Work Step by Step
a. The only significant digit is 5 so there is only 1 significant digit.
b. The last three digits on the right are significant so there are 3 significant digits.
c. The 7.2 is significant so there are 2 significant digits.
d. All five digits are significant so there are 5 significant digits.
