Question

If A = (12.0+ 0.1) cm and B=(8.5+ 0.5) cm, find (1) A + B and (ii) A - B. [Delhi 04] [Ans. (i) 20.5+ 0.6 cm (ii) 3.5+ 0.6 cm]


kindly explain​

Answer 1

Answer:

whether in addition or substraction errors are always added

i) Z+ΔZ=A+B+(ΔA+ΔB)

A=(12+0.1)+(8.5+0.5)=20.5 +0.6

ii) Z+ΔZ=A-B+(ΔA+ΔB)

A=(12-0.1)+(8.5+0.5)=3.5 +0.6