Moderate -0.5 This is a straightforward algebraic manipulation question requiring cross-multiplication and rearranging to isolate C. While it involves a fraction and collecting terms, it's a standard technique taught early in C1 with no conceptual difficulty, making it slightly easier than average.
Question 10:
10 | 4P −4P
[C =] or o.e.
1−P P−1 | 44 | M1for PC + 4P = C
M1 for 4P = C − PC or ft
M1 for 4P = C (1 − P) or ft
4
B3 for [C =] oo.
1
−1
P
unsimplified | 4