Answer :
The mass of the cube, 51.7 g, also has 3 significant figures.
The number of significant figures in a measurement is the number of digits that are known to be accurate plus the first uncertain digit.
In the measurement of the cube's length, the first three digits, 2, 3, and 5, are known to be accurate. The fourth digit, 4, is uncertain. So, the measurement has 3 significant figures.
About Significant figures
Significant figures are the digits in a number that are known with certainty plus any zeros between them.Significant figures are important for accuracy in measurements and calculations. When you are working with measurements, it is important to keep track of the significant figures so that you do not give a false sense of precision.
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