Answer: 6, 7 and 6 significant figures, respectively.
Step-by-step explanation:
A. 67.20 x 8.02 = 538.944, has 6 significant figures .
B. 486.02 x 0.056 = 27.21712, has 7 significant figures .
C. 11.264 + 245.3 = 256.564 = 6 significant figures.
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