C4Lmarks

# C4Lmarks - FOR EDEXCEL GCE Examinations Advanced Subsidiary...

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F OR E DEXCEL GCE Examinations Advanced Subsidiary Core Mathematics C4 Paper L MARKING GUIDE This guide is intended to be as helpful as possible to teachers by providing concise solutions and indicating how marks could be awarded. There are obviously alternative methods that would also gain full marks. Method marks (M) are awarded for knowing and using a method. Accuracy marks (A) can only be awarded when a correct method has been used. (B) marks are independent of method marks. Written by Shaun Armstrong Solomon Press These sheets may be copied for use solely by the purchaser’s institute.

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Solomon Press C4 L MARKS page 2 C4 Paper L – Marking Guide 1. (a) d d n t = 0 e 0.5 t = 5 M 1 t = 2 ln 5 = 3.219 mins = 3 mins 13 secs M1 A1 (b) d n = (e 0.5 t 5) d t n = 2e 0.5 t 5 t + c M 1 A 1 t = 0, n = 20 20 = 2 + c , c = 1 8 M 1 n = 2e 0.5 t 5 t + 1 8 A 1 (c) as t increases, n rapidly becomes very large not realistic B1 (8) 2. 6 x + y + x d d y x 4 y d d y x = 0 M 1 A 2 (1, 4) 6 + 4 + d d y x 16 d d y x = 0, d d y x = 2 3 M 1 A 1
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## This note was uploaded on 06/04/2010 for the course MATH c3 taught by Professor N/a during the Spring '10 term at Cambridge College.

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C4Lmarks - FOR EDEXCEL GCE Examinations Advanced Subsidiary...

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