Not addition, since

and 0 doesn't belong to the set.
Not subtraction, since

.
It is closed under multiplication. The set appears to contain all non-zero multiples of 3.
Not division, since dividing some of the numbers results in rationals which do not belong to the set.
What other operations are you supposed to consider?
I don’t see a picture of the problem
4/8 is the same as 1/2, so half. If you only have 4/8, then half of eight is 4. 4 servings.
Answer:
11
Step-by-step explanation: 11 times 11 equals 121
Answer:
15 ft
Step-by-step explanation:
I'm not sure but I think u add them together to get ur answer
hope it helps