Answer:
Jacob uses 5 and 2/3 yards of fabric for the cape.
To solve this, you need to multiply the total amount of fabric Jacob has (17 yards) by the fraction of the fabric he uses to make the cape (1/3):
17 yards x 1/3 = 5 and 2/3 yards.
Therefore, Jacob uses 5 and 2/3 yards of fabric for the cape.
Hope it helps :)