Tomas starts at the first guide booth at point (3, 0). He then places additional pins by moving 1 unit east and 3 units north for each subsequent booth.
Let's list the coordinates of the guide booths step-by-step:
- First guide booth: (3, 0)
- Second guide booth: Moves to (3 + 1, 0 + 3) = (4, 3)
- Third guide booth: Moves to (4 + 1, 3 + 3) = (5, 6)
- Fourth guide booth: Moves to (5 + 1, 6 + 3) = (6, 9)
- Fifth guide booth: Moves to (6 + 1, 9 + 3) = (7, 12)
Therefore, the fifth guide booth is located at (7, 12).
The correct answer is (7,12).