Math 8 · Unit 2: Expressions, formulae and equations · Cambridge Lower Secondary Maths Stage 8

Questions

1. 1. If a = 3 and b = −2, what is 2a + b²?

   • 8
   • 2
   • 4
   • 10
   Check

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

   • 21
   • 11
   • 10
   • 30
   Check

3. 3. If x = 4, what is 3x²?

   • 36
   • 48
   • 24
   • 144
   Check

4. 4. Make x the subject: y = x + 7.

   • x = 7y
   • x = y − 7
   • x = 7 − y
   • x = y + 7
   Check

5. 5. Make r the subject: C = 2r.

   • r = 2/C
   • r = C − 2
   • r = 2C
   • r = C/2
   Check

6. 6. If p = −3, what is 5 − 2p?

   • −1
   • 11
   • −11
   • 1
   Check

7. 7. Area A = ½bh. Find A when b = 10, h = 7.

   • 8.5
   • 35
   • 17
   • 70
   Check

8. 8. If m = 2 and n = 5, what is (m + n)²?

   • 14
   • 29
   • 27
   • 49
   Check

9. 9. Make t the subject: d = st.

   • t = s/d
   • t = ds
   • t = d/s
   • t = d − s
   Check

10. 10. F = 1.8C + 32. Find F when C = 100.

    • 212
    • 180
    • 1832
    • 133.8
    Check

11. 11. If x = −1, what is x² + x?

    • 1
    • 0
    • 2
    • −2
    Check

12. 12. Make a the subject: P = 4a.

    • a = 4P
    • a = 4/P
    • a = P/4
    • a = P − 4
    Check

13. 13. If a = 6, what is a/3 + 2?

    • 1.2
    • ⅔
    • 8
    • 4
    Check

14. 14. Make x the subject: y = 3x − 4.

    • x = (y + 4)/3
    • x = 3y + 4
    • x = y/3 + 4
    • x = (y − 4)/3
    Check

15. 15. Cost C = 20 + 5n for n hours. What is C for 6 hours?

    • 31
    • 50
    • 150
    • 125
    Check