To determine the appropriate length board in inches that Mia should use for the length of the shelter, we first need to convert 3.25 feet into inches.
1 foot is equal to 12 inches. Therefore:
3.25 feet = 3.25 × 12 inches = 39 inches.
Now, let's look at the options provided:
- 48 inch board
- 42 inch board
- 39 inch board
- 36 inch board
The correct choice for the length of the shelter is the 39 inch board.