Answer:
2.3ft
Explanation:
3 shelves = 3.85, 2.35, 1.50.
add all together = 7.70
subtract the sum of all three shelves together from the length of the board
10ft - 7.70ft
The answer is...
2,3. 2,3 is the length of the fourth shelf.
3.5m questions
4.4m answers