please can you solve these three THANK YOU IN ADVANNCE

Which one of the following describes a short position? Multiple Choice Purchasing a security on margin Selling a security that you do not own Loaning a security to your broker to cover a margin call Having less equity than required in your margin account Selling a security that you originally purchased on margin Sam is purchasing 800 shares of RPT, Inc., stock at a price per share of $24.50. What is the minimum amount the Federal Reserve will require Sam to pay in cash for this purchase? Multiple Choice $9,800 $6,200 $10.968 $11,960 $4,488 Donna recently purchased 600 shares of Deltona stock for $37 a share. Her broker required a cash payment of $16,650, plus trading costs, for the purchase. What is the initial margin requirement on this stock? Multiple Choice 90% 75% 60% 80% 65%