We have to use the following log rules here

So for the given question , that is
![18log \sqrt x +9 log \sqrt [3]{x}-log 10 = log(x^{18/2}) + log(x^{9/3})-log 10](https://tex.z-dn.net/?f=%2018log%20%5Csqrt%20x%20%2B9%20log%20%5Csqrt%20%5B3%5D%7Bx%7D-log%2010%20%3D%20log%28x%5E%7B18%2F2%7D%29%20%2B%20log%28x%5E%7B9%2F3%7D%29-log%2010%20)


Answer:
look below
Step-by-step explanation:
Product of odd number of negative terms is negative.
Hence, I have given all the 8 possibilities.
Please refer to the table attached.
Answer:
Don't subtract exactly or it will be incorrect, you'll have to add the years, and differentiate the leap years
Step-by-step explanation:
30 yrs old
sorry I dont have a shorter method