Pleas help me its A TIMED TEST

−12+(−5)

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?

In a column proof the right column states your reasons