4MA0 Higher June 2012 Paper 3 Q20
20 Correct to 2 decimal places, the volume of a solid cube is 42.88 cm\(^3\)
Calculate the lower bound for the surface area of the cube.
(4)
| Scheme | Marks |
|---|---|
| 42.875 seen | B1 |
| \(\sqrt[3]{42.875}\) | B1 |
| \(6 \times 3.5^2\) | M1 |
| 73.5 | A1 |
| (Total 4 marks) |
Notes
B1: Also accept \(42.874\dot{9}\), 42.87499... throughout
B1: Also award for 3.5 if first B1 scored ie if 42.875 seen
M1: dep on both B1s
A1: cao Award 4 marks if answer is correct and both B marks scored