Given that Y is 20 m on a bearing of 300° from X, how far south of Y is X?

Find the mean deviation of 20, 30, 25, 40, 35, 50, 45, 40, 20 and 45.

The equation of the line through the points $(4,2)$ and $(-8,-2)$ is $3y=px+q$, where $p$ and $q$ are constants. Find the value of $p$.

A fence 2.4 m tall, is 10 m away from a tree of height 16 m. Calculate the angle of elevation from the top of the tree from the top of the fence.