what does in() stand for?

Question

anonymous · Answer

in  
/in/
Preposition
Expressing the situation of something that is or appears to be enclosed or surrounded by something else: "living in Deep River".
Adverb
Expressing movement with the result that someone or something becomes enclosed or surrounded by something else: "come in"; "bring it in".
Adjective
(of a person) Present at one's home or office: "we knocked but there was no one in".
Noun
A position of influence: "an in with the nominee".
Synonyms
preposition.  	at - on - into - to - by - for - within - with - over
adverb.  	inside - within - indoors - inwardly
adjective.  	inner - inward

anonymous · Answer

it is in the equation: y =2 In(x+3).

stamp · Answer

ln(x) is the natural logarithm function. Natural log is $$log_{e}$$

anonymous · Answer

so it could be writen 2* log_x+3

anonymous · Answer

https://www.khanacademy.org/math/algebra/logarithms-tutorial