Respuesta :

Step-by-step explanation:

4.629+78.2=82.829

82.829-57=25.829

By considering the significant figures, we can see that the sum is equal to 26.492.

How to perform the sum?

Here we want to perform the sum:

4.629 + 78.2 - 57

If we assume that the numbers are exact, then we can complete the significant figures for the third and second numbers as:

4.692 + 78.200 - 57.000

Then the sum is just:

4.692 + 78.200 - 57.000 = (4 + 78 - 57) +  (0.692 + 0.800) = 56.492

If you want to learn more about significant figures:

https://brainly.com/question/24491627

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