Not sure if there’s more but if there is could you tell me which ones?

Answer:
3(8+2a)
Step-by-step explanation:
You just want to simplify the equations to see if they equal 6a+24, which in this case 3(8+2a) does. The other two equal something else, hopefully this helps :)
Answer:
a
Step-by-step explanation:
3x8 is 24 and 3x2a is 6a
I think it's just a and c