Find the value of the following addition with due consideration of signification figures 0.75 + 2.128 + 15.6 .

Explanation

As this is sum, we have to consider decimal places.
Here 15.6 has one decimal place.
Here 2.128 is to be rounded off to 1 + 1 = 2 decimal places and 0.75 should be left as it is `therefore 2.128 = 2.13`
`0.75 + 2.13 + 15.6 = 18.48`
This is to rounded off to one decimal place . The result is 18.5 .