**Q4: **

Find the possible values of which satisfy the equation .

- A15
- B15 or 21
- C21
- D15 or 6
- E6

**Q5: **

Using the equations and to find the values of and , evaluate the expression .

**Q6: **

Find the value of given that .

**Q7: **

Write in the form .

- A
- B
- C
- D

**Q8: **

By applying the relation , deduce the value of .

**Q9: **

Given that , determine the value of .

**Q10: **

Evaluate .

**Q11: **

Evaluate .

- A
- B
- C
- D5
- E7

**Q12: **

If and , find and .

- A ,
- B ,
- C ,
- D ,

**Q13: **

Find all of the possible values of , given that .

- A8
- B13, 11
- C9
- D9, 8

**Q14: **

Given that and , find .

**Q15: **

If , find .

**Q16: **

If , determine .

- A10, 21
- B8, 2
- C9, 1
- D10, 7

**Q17: **

Find the value of such that .

**Q18: **

Given that , determine all the possible values of .

- A6
- B6 or 29
- C7
- D6 or 7
- E29

**Q19: **

Find the value of , given that and .

**Q20: **

Given that , determine and .

- A ,
- B ,
- C ,
- D ,
- E ,

**Q21: **

Find and , such that and .

- A ,
- B ,
- C ,
- D ,
- E ,

**Q22: **

Using the equation , evaluate the expression .

- A
- B
- C
- D

**Q23: **

Which of the following is equal to ?

- A
- B
- C
- D

**Q24: **

If , determine .

**Q25: **

Evaluate .

- A
- B
- C480
- D
- E