If log₁₀ 2=0.3010 and log₁₀ 7=0.8451, then the value of log₁₀ 2.8 is

(13)³+7³/(13)²+7²-? =20

If a^x - b, b^y – c and c^z – a, then the value of xyz is:

2^x x 8^1/5 = 2^1/5, then x is equal to: