Question
Multiply: $\frac{9}{-7}\ \text{by}\ \frac{36}{-11}$
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| Months | Number of watches sold |
| July | 1000 |
| August | 1500 |
| September | 1500 |
| October | 2000 |
| November | 2500 |
| December | 1500 |
| x | 6 | 10 | 14 | 18 | 22 | 26 | 30 |
| y | 4 | 8 | 12 | 16 | 20 | 24 | 28 |