a)
Step 1: Determine the coordinates of town T from John's initial position.
Let John's initial position be the origin O(0,0). John travels 40 km on a bearing of 210∘.
To convert a bearing to a standard angle θ (measured counter-clockwise from the positive x-axis), we use θ=90∘−bearing.
For a bearing of 210∘:
θT=90∘−210∘=−120∘.
The coordinates of T are (xT,yT):