You play a game where you score -6 points on the first turn and on each of the next 3 turns. What is your score after those 4 turns?

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?

Measures of the angle of r, 31 s (x+4) t (3x+9)

Which letters from the table represent like terms? a and b b and c a and d b and d