Measurement of the length of something

A 3.6 cm long radio antenna is added to the front of an aeroplane 41 m long. What is the overall length?

Repeat this problem with an aeroplane length of 41.05 m.

The answer must be to the correct significant figures.

Full details are in the attachment below.

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...s on how many digits the measurement has been done to.

This problem requires an ...