The owners of an amusement park want to add more rides and an arcade in an open field. Beloe is a sketch of their plan. the owners do not know all of the measurements of the field

Step-by-step explanation:

Formula to get the area of a rectangle,

Area = Length × Width

Area of rides area = 30 × n

                              = 30n yds²

Area of the arcade = 30 × 40 yds²

Area of the whole field = Area of rides + Area of Arcade

                            Area  = [30n + 30(40)] square yards

Length of whole field = (n + 40) yds

Width of whole field = 30 yds

Area of the whole field = 30(n + 40) square yards