Question

Question #0fc9d

Answer 1

a) 4 s.f.
b) 4 s.f.
c) 3 s.f.

Explanation:

The number of significant figures in each case are as follow:

a) `0.007160xx10^5` 4 significant figures.

three leading zeros don't count. one trailing zero in a number that has a decimal point counts. the `10^5` this is for scientific notation don't count.

b) `0.0004100xx10^7` 4 significant figures.

Same as aforementioned, however, here we have two trailing zeros that count.

c) `0.00900` 3 significant figures.

A screenshot taking from my teaching notes.