15 inches of ribbon is needed.
Explanation:
To find how much ribbon is needed to go around the edge of the card, find the perimeter. The perimeter is the length around the card.
Perimeter is found by P = 2l + 2w where w=3.5 and l=4.
P = 2(4) + 2(3.5)
P = 8 + 7
P = 15 inches
15 inches of ribbon is needed.