Answer:

Step-by-step explanation:
By definition, we can write ln instead of log. WHEN??
Whenever the base of the logarithm is the number "e".
Hence, when we have:

We can write it in shortcut as:

Hence, ln x can also be written as 
Fourth answer choice is right.
Answer:
8×
Step-by-step explanation:
you just add 7×+1 and the answer will be 8×
Answer:
45 inch
Step-by-step explanation:
its just my guess don't take it serious