Question

If A = ( 12 + or - 0.1 ) cm and B = ( 8.5 0.50cm) find (i) A + B (ii) A – B​

Answer 1

Given:

$A = 12 \pm 0.1 \: cm \: and$

$B = 8.5 \pm 0.5 \: cm$

To find:

• A + B
• A - B

Calculation:

• Errors always have to be added irrespective of the operation being done (whether + or -).

$A + B = (12 + 8.5) \pm (0.1 + 0.5)$

$\implies A + B =20.5 \pm 0.6 \: cm$

Now, second part:

$A - B = (12 - 8.5) \pm (0.1 + 0.5)$

$\implies A - B =3.5 \pm 0.6 \: cm$

Hope It Helps.