Answer:
1
Step-by-step explanation:

Answer:
280
Step-by-step explanation:
7*5*4*2=280
20*6=120seconds +3600second in an hour so 3600*4=14400
1210+14400=14520
14520 is the answer I hope this helps!
The set X = { x , {x} } would, I think, fit the Bill
So its 2 elements