Used Tractor Values

I have a lake thats the distance described above that I want to use my tractor to water my property with. Maybe run three large sprinklers or even a couple of small ones,

Two tractors are used to drag a large boulder across a field. The larger tractor exerts a force of 3200 N toward [120º].The smaller tractor pulls with a force of 2500 N toward [65º]
[a] Determine the resultant force on the boulder
[b] Determine the equilibrant force