Question 85509
Comment: Remeber, log is just another word for exponent.
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1. Evaluate log3 (3^8)
You want the exponent of 3 that gives you 3^8
The answer is "8".
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2. Find value of x: log3(81) =x 
You are told that x is exponent of 3 that gives you 81
3^x=81
x=4
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3. Write equation (1/3)^-6 = 729 in logarithic form
The exponent is -6.
So write log(base 1/3) 729 = -6
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4. Assume x is positive number and use logarithm expression
log (x + 3) - logx
=log[(x+3)/x]

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Cheers,
San H.