Here is a site to help you with significant figures. http://www.chemteam.info/SigFigs/SigFigs.html
1. How many mols do you need? That's mols = M x L = ?
Then mols NaI = grams NaI/molar mass NaI. You know molar mass and mols, solve for grams.
2. mols c6H12 = grams/molar mass
Then M = mols/L solution.
3. See #1. mols needed = M x L = ?
Round each answer following the rules in the site I gave you.
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