Suppose that the reserve ratio is 10% when the Fed buys $100,000 of U. S. Treasury bills from the banking system. If the banking system does NOT want to hold any excess reserves, will be added to the money supply.

When a company produces and sells x thousand units per week, its total weekly profit is p thousand dollars, where upper p equals startfraction 800 x over 100 plus x squared endfraction . the production level at t weeks from the present is x equals 4 plus 2 t. find the marginal profit, startfraction dp over dx endfraction and the time rate of change of profit, startfraction dp over dt endfraction . how fast (with respect of time) are profits changing when tequals8?