Question

measured value 28.7053 cm, which has six significant figures. round the measurement to five significant figures.
a 28.71 cm
b 28.7053 cm
c 28.700 cm
d 28.705 cm

Explanation:

Step1: Identify significant figures rule

When rounding to a certain number of significant figures, look at the digit after the last - significant - digit we want to keep.

Step2: Analyze the given number 28.7053

We want to round it to five significant figures. The fifth significant figure is 5 and the digit after it is 3. Since 3 < 5, we simply drop the 3.

Answer:

d. 28.705 cm