Date | May 2019 | Marks available | 2 | Reference code | 19M.1.SL.TZ2.T_15 |
Level | Standard Level | Paper | Paper 1 (with calculator from previous syllabus) | Time zone | Time zone 2 |
Command term | Differentiate | Question number | T_15 | Adapted from | N/A |
Question
A potter sells vases per month.
His monthly profit in Australian dollars (AUD) can be modelled by
Find the value of if no vases are sold.
Differentiate .
Hence, find the number of vases that will maximize the profit.
Markscheme
* This question is from an exam for a previous syllabus, and may contain minor differences in marking or structure.
−120 (AUD) (A1) (C1)
[1 mark]
(A1)(A1) (C2)
Note: Award (A1) for each correct term. Award at most (A1)(A0) for extra terms seen.
[2 marks]
(M1)
Note: Award (M1) for equating their derivative to zero.
OR
sketch of their derivative (approximately correct shape) with -intercept seen (M1)
(A1)(ft)
Note: Award (C2) for seen without working.
23 (A1)(ft) (C3)
Note: Follow through from part (b).
[3 marks]