Respuesta :

Step-by-step explanation:

b) sum: (614 m + 304 m) +- 1.0 m

= 918 m +- 1.0 m

difference = (614 m - 304 m) +- 1.0 m

= 310 m +- 1.0 m

c) sum = (1400 kg + 900 kg) +- 100 kg

= 2300 kg +- 100 kg

difference = (1400 kg - 900 kg) +- 100 kg

= 500 kg +- 100 kg

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