If x = log 0.6; y = log 1.25 and z = log 3 - 2 log 2, find the values of :

(i) x + y - z

(ii) 5^{x + y - z}

If a² = log x, b³ = log y and 3a² - 2b³ = 6 log z, express y in terms of x and z.

If m = log 20 and n = log 25, find the value of x, so that : 2 log (x - 4) = 2m - n