If log x - log (2x - 1) = 1, the value of x is :

1. $\dfrac{19}{10}$

2. 19 × 10

3. $\dfrac{10}{19}$

4. $\dfrac{1}{19 \times 10}$

If x = log $\dfrac{3}{5}, \text{ y = log } \dfrac{5}{4}\text{ and z = 2 log } \dfrac{\sqrt{3}}{2}$, the value of x + y - z is :

1. 1

2. -1

3. 2

4. 0

If log y + 2 log x = 2, the value of y in terms of x is :

1. x² ÷ 100

2. 100 ÷ x²

3. x ÷ 10

4. 10 ÷ x

If log₁₀ 8 = 0.90; find the value of :

(i) log₁₀ 4

(ii) log $\sqrt{32}$

(iii) log 0.125