Can someone plz help me ASAP!

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

Apiling for a high-rise building is pushed by two bulldozers at exactly the same time. one bulldozer exerts a force of 1250 pounds in a westerly direction. the other bulldozer pushes the piling with a force of 2650 pounds in a northerly direction. what is the direction of the resulting force upon the piling, to the nearest degree? a. 65 n of w b. 25 n of w c. 45 n of w d. 35 n of w

2x minus y equals 6, x plus y equals negative 3