If log 2 = 0.3010 and log 3 = 0.4771; find the value of log 15.

If log 2 = 0.3010 and log 3 = 0.4771; find the value of log 25.

Given 2 log₁₀ x + 1 = log₁₀ 250, find :

(i) x

(ii) log₁₀ 2x