Higher November 2021 Paper 1 Q22
22 Work out the value of \(\quad \left(\dfrac{5}{7}\right)^{-2}\)
Give your answer as a mixed number. [3 marks]
| Answer | Mark | Comments |
|---|---|---|
| \(1\dfrac{24}{25}\) | B3 | oe mixed number B2 \(\dfrac{49}{25}\) B1 \(\left(\dfrac{7}{5}\right)^2\) or \(\dfrac{1}{\left(\frac{5}{7}\right)^2}\) or \(\left(\dfrac{1}{5/7}\right)^2\) or \(\dfrac{1}{25/49}\) or \(\left(\dfrac{25}{49}\right)^{-1}\) or \(\dfrac{1}{5^2} \div \dfrac{1}{7^2}\) |
Additional guidance
| For B2 or B1 allow equivalent fractions or decimals eg 1.96 for \(\dfrac{49}{25}\) | B2 |