3. A, (first choice)
4. C (Third choice from top)
I am assuming that user_val is an inputted variable and a whole number (int)...
user_val = int(input("Enter a number: "))
if user_val < 0:
print("negative")
else:
print("non-negative")
* Main Electron a component- vacuum tube.
* Main memory- Magnetic drums and magnetic tapes.
* Programming language- Machine language.
* Power- Consume a lot of electricity and generate a lot of heat.
* were expensive to operate