We can't answer the first question, because we know nothing about the spinner (looks like some information is missing).
As for the second question, the coordinates of the midpoint are simply the average of the coordinates of the endpoint, so if we let [tex]M[/tex] be the midpoint of [tex]A[/tex] and [tex]B[/tex], we have
[tex]M=\left(\dfrac{A_x+B_x}{2},\dfrac{A_y+B_y}{2}\right)[/tex]
Plugging in the numbers, we have
[tex]M=\left(\dfrac{2+8}{2},\dfrac{12+2}{2}\right)=(5, 7)[/tex]
