A school campus is imagined to be placed on a coordinate grid where the origin represents the main gate. Using this reference, answer the following:
(a) The library is 4 units to the right of the y-axis and 2 units below the x-axis. Write its coordinates.
(b) The sports ground entrance is 3 units to the left of the y-axis and lies exactly on the x-axis. Find its coordinates.
(c) A notice board is fixed 6 units above the x-axis and is in the same vertical line as the library. Determine its coordinates.
(d) State the quadrants (or axis) in which each of the three locations obtained in parts (a), (b) and (c) lie.