Answer:

Performing the indicated operations and expressing the answers with the correct number of significant figures:

1. 293 + 1,482 = 1,775 (four significant figures)

2. 4,962 + 2,318 = 7,280 (four significant figures)

3. 5,129 - 792 = 4,337 (four significant figures)

4. 621 x 243 = 150,843 (five significant figures)