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Cambridge Mathematics 9: Formulae

10 questions with solutions on the Cambridge Mathematics 9 topic: substituting into formulae, changing the subject, writing a formula.

Type the number or choose the right answer. When you finish, click Check answers and see the solutions.

1. v = u + at. Find v when u = 5, a = 2 and t = 3.

2. A = ½bh. Find A when b = 8 and h = 5.

3. F = 9C/5 + 32. How many °F is 25 °C?

4. P = 2(l + w). Find P when l = 7 and w = 4.

5. Make x the subject of y = 3x + 6.

6. Make r the subject of C = 2πr.

7. v² = u² + 2as. Find the positive v when u = 3, a = 2 and s = 4.

8. A taxi charges 50 denars to start plus 30 denars per km. The formula for the cost C for k km?

9. Using the same formula, how many denars does an 8 km ride cost?

10. s = d/t. What is the speed in km/h when d = 150 km and t = 3 h?