Answer:
Numbers 4, 6, & 7 are correct
Explanation:
4- this allows the op amp to have zero voltage so that maximum voltage is transferred to output load.
6- this ensures that op amp doesn't cause loading in the original circuit, high input impedance would not deter the circuit from pulling current from it.
7- high difference between upper and lower frequencies.
The ratio between a and b is 1/3
Answer:
Both come from the sun
Both are reusable sources
and both don't cause pollution
Explanation:
Compound machine is the answer
