Intermediate November 2017 Unit 1 Q5
5.
(a) Write down the next two numbers in the following sequence. [2]
22 21 18 13 ……… ………
(b) Expand \(5(3x - 2)\). [1]
(c) Solve \(9x + 3 = 4x + 5\). [3]
| Scheme | Marks | Comments |
|---|---|---|
| 6 and −3 | B2 | B1 for each. Allow F.T. for 2nd number if ‘9 less than previous number’ AND negative. |
| Scheme | Marks | Comments |
|---|---|---|
| 15x – 10 | B1 | Must be an expression. Mark final answer. |
| Scheme | Marks | Comments |
|---|---|---|
| 9x – 4x = 5 – 3 | B1 | F.T. until 2nd error. |
| 5x = 2 OR −2 = −5x | B1 | |
| x = \(\dfrac{2}{5}\) or equivalent. | B1 | Mark final answer. Do not allow x = −2/−5. A final answer of ‘2 ÷ 5’ is B1B1B0. |