In order to invert a function, switch y and x in the definition, and solve for y again:

Solving for y, we have

The factors of 15 are 1, 3, 5 and 15. Now, as 1 is neither prime and nor a composite number (1 is not Prime because for a number to be a prime, it should have exact 2 factors i.e. 1 and itself, but 1 has only one factor. Therefore 1 is not prime.)
So the smallest prime factor of 15 is 3.
Hope this helped! :)
I don’t know the answer to that sorry.
Complete Question
Refer to attachment
Answer:
Option C
Step-by-step explanation:
From the question we are told that:

Generally the angle of inclination is 


Generally the equation for x is mathematically given by


Since x exists in the second quadrant
Therefore the value of x in simplest form is

Option C