For each of the mathematical expressions given:

1. Tell the correct number of significant figures for the answer.
2. Evaluate the mathematical expression using correct significant figures in the result.

Number of Significant Figures Result
2.46 × 2
47.826 - 9.4
3.984 × 2.16
29.3 ÷ (284 × 4.2)
714.3 - 18.56
15.467 - 9.23