If A =12.0 cm `pm` 0.1 cm and B 8.5 cm `pm`0.5 cm, find A + B

Explanation

To solve the problem of finding A + B given the values A = 12.0 cm ± 0.1 cm and B = 8.5 cm ± 0.5 cm, we will follow these steps:

### Step 1: Write down the values of A and B
- A = 12.0 cm with an uncertainty of ± 0.1 cm
- B = 8.5 cm with an uncertainty of ± 0.5 cm

### Step 2: Calculate the sum of A and B
To find A + B, we simply add the two values:
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