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Remember, the number of grains of sand on all the world's beaches is approximately
7,500,000,000,000,000,000 How many significant figures does this number have?

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If the number of grains of sand on all the world's beaches is approximately 7,500,000,000,000,000,000, then, the number of significant figures in the number would be 19.  

The answer was derived according to these rules of significant figures:

  • All non-zero digits are significant. There are 2 non-zero digits in the number of sand above.
  • All zeros are significant except those before the first significant digit in a number. For example 0.005 only have 1 significant digit, but 1.005 have 4 significant digits.

Following these rules, it means all the zeros in the number of sand on all the world's beaches are significant and they amount to 17. Adding the first 2 significant digits to 17 would amount to 19.

More on significant digits can be found here: https://brainly.com/question/17396594

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