If L = 2.06 cm pm 0.02 cm , B = 1.11 cm pm 0.03 cm . What are (L+B) and (L-B) equal to?

If L = 2.06 cm pm 0.02 cm , B = 1.11 cm pm 0.03 cm . What are (L+B) an

1.	If L = 2.06 cm pm 0.02 cm , B = 1.11 cm pm 0.03 cm . What are (L+B) and (L-B) equal to?
Answer» Solution :`L+B= 3.17cm +- 0.05cm` `L-B= 0.95 cm +- 0.05cm` Please NOTE that ACTUAL values i.e. 2.06 cm and 1.11 cm are ADDED in CASE of (L+B) and SUBTRACTED in case of (L-B), but absolute errors are added in both cases.