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Answer:

Step-by-step explanation:
using the properties of logarithms, the log of a product gives the addition of logs, and the log of a quotient gives the subtraction of logs;

"tens" can be represented in numbers as "10"
15 tens means that you will multiply 15 by the tens (multiply 15 by 10).
Based on this:
15 tens = 15 x 10 = 150
Therefore:
15 tens is equivalent to 150
The answer is -1/15 or 0.66666 well i think im not that good at math soooo sorry if its wrong