Alright, lets get started.
The given function is :

When we find the domain of any function, we consider the domian is set of input values for which function should remain real and defined.
In this given function , we have not given any points where function seems going undefined.
Hence the domain is : (-∞, +∞) : Answer
Hope it will help :)
If it’s a negative slope A, if it’s a positive slope B
The answer is 30%) because all the angles of a triangle needs to add up to 180 so 180-75-75= 30