y=19!! hope this helps :)
How many cubic feet are in a carton measuring 6 feet, 8 inches by 3 yards by 4.5 inches?
Make two shapes out of it.
The bottom is a rectangle 14 x 5 = 70 square cm
The top is a triangle 1/2 x 12 x 5 = 30 square cm
Total area = 70 + 30 = 100 square cm
Answer: 15309
hope this helps, the nth term calulation is (7/3) times 3^n
