If x = log , the value of x + y - z is : 1. 1 2. -1 3. 2 4. 0

Solving, Hence, Option 4 is the correct option.

If log (5x - 4) - log (x + 1) = log 4, the value of x is :
6
8
4
12

If log y + 2 log x = 2, the value of y in terms of x is :
x² ÷ 100
100 ÷ x²
x ÷ 10
10 ÷ x