Swiss Cottage WA2 (2021+2022) Revision Paper.Ans

2021 and 2022 Edited Revision Paper Marking Scheme1(i)Let and then YaXb11200047500ln11ln7533601 (5 s.f)33600 (3 s.f)aSubstitute ln11X and 112 000Y,112 00033601ln11192 570 (5 s.f)193 000 (3 s.f)bbb(ii)33601ln193570PmWhen 90 000P,102 57033 60190 00033 601lnm+193 27033 601lnm=103 570102 570ln33 601e21.2 months (3 s.f)mmm

74

2(i)6.3258.94410.95412.64914.142 2(ii)When , . From the graph the vertical intercept is .Answer 74 kg/acre2(iii)From the graph12910213.46.84.09 (3 s.f)a2(iv)When , . From graph, kg/acre.3) fx2334234xx323342xfx123334422x12934934xx4)4(23)(3)yxxdydx34234332xxx34423323xxx3232233xxx323463xxx32353xx5)y2343xx212343xx

dydx1 122 2212143323434243xxxxx1122264364343xxxxx126434343xxxxx126433343xxxx3218143xxx318143xxx