Evaluate log base10 raise to the power of 350+log base10 raise to the power of 105-log base10 raise to the power of 84

Answer 1

again, this makes no sense.

Answer 2

I agree with bobpursley that your wording makes no sense.

Did you simply mean:
log₁₀ 350 + log₁₀ 105 - log₁₀ 84 ??
That would become
log₁₀ (350*105/84)
= log₁₀ 437.5
or simply log 437.5

btw, if the base of the log is 10, it does not have to be stated, so
if I say log₁₀ 56, I could just say log 56.