2019 A2 Maths Paper 1 marking scheme

1i(a) Area(R)i1i×0.5i×i1i+i2(e0.05i+ie0.2i+ie0.45i)i+ie0.8i 2   B1 1.1b M1 1.1b =i1i×10....i=2....i=2.73i(2dp)  4    A1 1.1b (3) (b)(i) 2 ∣∫4i+ie1ix2iiiiiidx∣i=4(2)i+"2.73"i=10.73i(2dp)   5iiiii ∣iii0 ∣ B1ft 2.2a (b)(ii) 3 ∣ 1i(ix-i1)2 ∣ ∫e5 dxi="2.73"i(2idp) ∣iii1 ∣ B1ft 2.2a (2) (5imarks) Questioni1iNotes: (a)iB1: M1: A1: (b)(i)iB1ft: (b)(ii)iB1ft: Outsideibracketsi1i×0.5iori0.5iori0.25iori1 2 2 4 Foristructureiofitrapeziumirulei[ ]i. Noierrorsiareiallowed,missioniofiaiy-ordinateiorianiextraiy-ordinateioriairepeated y-ordinate Correctimethodileadingitoiaicorrectianswerionlyiofi2.73 10.73ioriaivalueiwhichiisi8i+itheiriansweritoiparti(a) Note:iDoinotiallowianiansweriofi10.6900…iwhichiisifoundidirectlyifromiintegration 2.73ioriaivalueiwhichiisitheisameiasitheiriansweritoiparti(a) Note:iDoinotiallowianiansweriofi2.6900…iori2.69iwhichiisifoundidirectlyifromiintegration