Which of the following does not represent a function?

graph of an absolute value function
graph of a negative parabola oriented about the y axis with y intercept at positive 6
graph of an ellipse with y intercepts negative 7 and positive 7
graph of a line with a positive slope and y intercept of negative 6

41/2 - 1 1/3 what is the answer as a fraction?

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.

If sin(x) = 0 and cos(x) = 1, what is tan(x)?