Since 12.3 is kind of a margin that you have to fit by, the total weight of the golf clubs must be lesser than or equal to 12.3. So, that's your expression:

x represents the number of golf clubs you have.
If this doesn't make sense, feel free tell me!
Answer:
{2,4,6}
Step-by-step explanation:
Hope it helps you
Yes, in a function you cannot have two different images for the same x.
Because if an x has more than one image, you couldn't tell what is the value of the image given that x.
Answer: I think it’s 4032
Step-by-step explanation: