If L = 2.05 cm pm 0.02 cm B = 1.11 cm pm 0.03 cm What are (L + B) and (L - B) equal to ?

If L = 2.05 cm pm 0.02 cm B = 1.11 cm pm 0.03 cm What are (L + B) an

1.	If L = 2.05 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 = 3.17 cm pm 0.05 cm` `L-B = 0.95 cm pm -0.05 cm` 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.