4400 Higher November 2004 Paper 4 Q21
21 Correct to 1 significant figure, \(x = 7\) and \(y = 9\)
(a) Calculate the lower bound for the value of \(xy\) (2)
(b) Calculate the upper bound for the value of \(\dfrac{x}{y}\) (3)
| Scheme | Marks |
|---|---|
| \(6.5 \times 8.5\) Answer: 55.25 | B2 |
| (2) |
Notes
B2: for 55.25
(B1 for 6.5 or 8.5 seen)
| Scheme | Marks |
|---|---|
| \(\dfrac{7.5}{8.5}\) | B1 B1 |
| 0.882… | B1 |
| (3) | |
| (5 marks) |
Notes
B1: for numerator 7.5
B1: for denominator 8.5
B1: for 0.88 or better (0.8823529…) Accept 0.9 if 7.5 and 8.5 seen