Four graphs are shown below: which graph represents a positive linear association between x and y?
graph a
graph b
graph c
graph d

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?

Write an equation of a line in slope intercept form that is perpendicular to the line 2x -3y = 12 and passes through the point (2, 6).

What is this inequality notation? t is less then or equal to 2