The surface of an air hockey table has a perimeter of 28 feet and an area of 40 square feet. What are the dimensions of the air hockey table?

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

The areas of two similar triangles are 72dm2 and 50dm2. the sum of their perimeters is 226dm. what is the perimeter of each of these triangles?

Jared had 3/7 of the minutes on a family phone plan remaining for the month. the plan is shared by 2 people. if divided equally what portion of the minutes remaining on the phone plan would be avalible for each person