physic problem solve step by step please

1-A box of mass 1.0 kg sits atop a frictionless surface inclined at 30 degree above the horizontal.  It is connected on its left side by a massless cord to a box of mass 3.0 kg on a horizontal frictionless surface through a massless and frictionless pulley.  A horizontal force of 2.3 N is applied to the 3.0 kg box in the positive direction.

What is the tension of the cord?