Please help me this.NO NEED SOLUTIONS. PHYSICS SUBJECT.ASAP THANKS

Four objects are situated along the y axis as follows: a 2.00kg object is at 3.00 m, a 3.00kg object is at 20.50 m, a 2.50-kg object is at the origin, and a 4.00-kg object is at 10.500 m. Where is the center of mass of these objects? *