4MA0 Higher June 2017 Paper 4R Q18
18 \(A\) is directly proportional to \(x^2\)
\(A = 480\) when \(x = 5\)
Find the value of \(A\) when \(x = 1.5\)
(3)
| Scheme | Marks |
|---|---|
\(480 = k \times 5^2\) or \(480 \propto k \times 5^2\) oe or or (\(k =\)) \(\dfrac{480}{5^2}\) or (\(k =\)) 19.2 oe \(k \propto \dfrac{480}{5^2}\) or \(k \propto 19.2\) oe | M1 |
| “19.2” × 1.5\(^2\) | M1 |
| 43.2 | A1 |
| (3) | |
| (3 marks) |
Notes
M1: Dep on M1
or for \(A = 19.2x^2\) oe
A1: oe