Answer:
79.95 yards.
Explanation:
Each board is 16 feet long and there are 3 feet in 1 yard. So, each board is 16/3 = 5.33 yards long (rounded to two decimal places).
If Steven has 15 yards of these boards, the combined length of the boards in yards is 15 times the length of each board, which is 15 x 5.33 = 79.95 yards (rounded to two decimal places).
Therefore, the combined length of the boards in yards is approximately 79.95 yards.