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4 Answers
- 6 years ago
The other answers fail to take into account the common logarithm in the equation.
- Subtracting 8 from each side gives log z = 7.
- Taking the inverse of common log (log base 10) gives z = 10^7.
- This cannot be simplified further, thus z = 10^7, or 10 million.
Source(s): http://www.rapidtables.com/math/algebra/Logarithm.... Look at "Logarithm as Inverse Function of Exponential Function" - Anonymous6 years ago
The answer is 7. You first do the inverse operation so you subtract 8 from +8 and 15. Then you will get 7 on the side with 15 and you'll be left with z on the other side since you subtracted eight from eight. Z=7. I hope I helped!