A. Plot the point in Cartesian Plane and determine what quadrant it belongs.
1. (3, -8)
2. (5, 4)
3. (-2, 1)
4.(-7, -6)
5. (0, 3)
6. (9, 0)

B. Write the piece-wise function that describes the given problem. A Zumba instructor charges according to the number of participants. If there are 15 participants or below, the instructor charges P500.00 for each participant per month. If the number of participants is between 15 and 30, he charges P400.00 for each participant per month. If there are 30 participants or more, he charges P350.00 for each participant per month.

C. Answer briefly.
1. How do we determine if the given graph represents a one-to-one function?

2. The set = {(4,6), (8,6), (12,6)} has three pairs with the same second coordinate. Does this mean that is not a function? Why? ​