$(5$pts$)$ Mohr's circle for a $2D$ state of plane stress is shown. Assume values are in MPa. Give answers to the nearest $\frac{+}{-}1$MPa.

From the plot, what are the values of $x,y,xy?$

What are the principal stresses oa and ob$?$

What is the magnitude of the maximum in$-$plane shear stress t$?$