Answer:

1. Board foot = depth × width × length / 144

5 × 8 × 36 / 144 = 0.75 ft^3 (12" x 12" x 1")

So the answer is: (5 × 8 × 36) / 144 = 0.75 ft^3

2. Board foot = depth × width × length / 144

5 × 3.433 × 8 / 144 = 0.5901 ft^3

So the answer is: 0.6 ft^3

Therefore, the total number of board feet for the given dimensions is 0.75 + 0.6 = 1.35 ft^3