3 or 4 point bend

Hey Maths forum!

I got another mechanics question I hope you are able to help.

For the diagram attached below,

1) what is the shear stress for the cross section perpendicular to the length of the beam
2) assuming a right-handed axis system with +x to the right and +y up. determine the stress x on the section titled as shown.
3) assuming a right-handed axis system with +x to the right and +y up. determine the stress y on the section titled as show
4) assuming a right-handed axis system with +x to the right and +y up. determine the shear stress xy on the section titled as show

kind regards,

dadon