Please help investments 3 :(

Table 2.3 Treasury Bond Date Mature Coupon Bid Asked Chg Ask Yield 11/03/2018 (t=0) 5/15/39 4.25 115.0772 115.4589 -0.21 3.26 2/6/2019 (t=n) 5/15/39 4.25 114.5978 114.7764 0.12 3.95 Table 2.2 AutoZone Dividend Date of Record (DOR) 11/25/18 Dividend Payment Date (DPD) 1/3/19 Dividend Amount Calculate Margin Requirements Long Initial Margin 55% Short Initial Margin 58% Long Maintenance Margin 49% Short Maintenance Margin 52% Table 2.1 AutoZone Stock Quotations Date Sym Open High Low Close Nt Chg. Vol 52 Week | 52 Week High Low Div Yield PE 11/03/2018 (t=0) ZO 665.32 672.75 567.73 566.22 1.67 2,342,780 698.42 486.23 2.36% 28.69 2/6/2019 (t=n) AZO 642.67 642.67 629.15 631.02 2.71 2,178,917 698.42 486.23 2.13% 30.09