I think your question is asking how you would round 17.521 to the nearest number with 1 significant figure...if that's the case, it would round to 10.
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It has 1 significant figure.
1150 to 1 significant figure is 1000
9753261 to 1 significant figure is 10,000,000
4252 to 1 significant figure is 4000.
0.019 to 1 significant figure is 0.02 (significant figure is counted from the left with 1st significant being the first non-zero from the left)