Answer:
1) To increase money supply by open market operations, Fed should buy $7 billion of government securities.
2) To increase money supply by adjusting reserve ratio, Fed should decrease the required reserves ratio.
Explanation:
The Money multiplier = 1 / Required reserves ratio = 1 / 0.25 = 4
1) To increase money supply by open market operations, Fed should Sell $7 billion of government securities.
( money supply increase by $4. So, to increase money supply by $35 billion, government securities to be sold to the amount of $18 billion / 4 = $4,5 billion)
(2) To increase money supply by adjusting reserve ratio, Fed should decrease the required reserves ratio.