To determine which values have 2 significant figures, let's examine each of the given values and identify those that have exactly 2 significant figures.
1. 180:
- This number has 3 significant figures. The digits '1', '8', and '0' all count as significant figures.
2. 90:
- This number has 2 significant figures. The digits '9' and '0' both count as significant figures.
3. 22.5:
- This number has 3 significant figures. The digits '2', '2', and '5' all count as significant figures.
4. 45:
- This number has 2 significant figures. The digits '4' and '5' both count as significant figures.
Based on this evaluation, the values that have exactly 2 significant figures are 90 and 45.
Therefore, the correct values to check are:
- ☐ B. 90
- N/A D. 45
