How many significant figures are in the value 10.00?

Answer 1

Only 1, that would be the first one. If it were 10.01 it would be 4 but as it is effectively 1 followed by 0's It will only be 1 Because 10.00 is the same as 10 and the same as 10.000000, the 1 Is the significant number

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I disagree. Unless the trailing 0s are there for decorative purposes, they are there for a reason and that reason is to indicate the degree of precision. Consequently there are 4 significant figures.