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Which of the following values have 2 significant figures? Check all that apply.

A. 180
☐ B. 90
C. 22.5
D. 45

Sagot :

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