Cite the phases that are present and the phase compositions for the following alloys: (a) 90 wt% zn—lo wt% cu at 400°c (750°f)(b) 75 wt% sn-25 wt% pb at 175°c (345°f)(c) 55 wt% ag-45 wt% cu at 900°c (1650°f)(d) 30 wt% pb-70 wt% mg at 425°c (795°f)(e) 2.12 kg zn and 1.88 kg cu at 500°c (930°f)(f) 37 lbm pb and 6.5 lbm mg at 400°c (750°f)(9) 8.2 mol ni and 4.3 mol cu at 1250°c (2280°f)(h) 4.5 mol sn and 0.45 mol pb at 200°c (390°f)