How can i simplify the following algebraic expressions and logarithm

This is basic stuff. Have you even tried?

Yes, i only need help on logarithm. The first lot of algebraic expressions i have already done.

[EDIT] - I need help on the logarithm questions only.

a^x = b implies loga(b) = x where loga is "log base a"

For problems like this, you can take the log of both sides. In the first problem, you get...
log (8.79^x) = log 67.65
x log 8.79 = log 67.65
x = log 67.65 / log 8.79

Use the same technique to solve for the second problem