Which explicit formula describes the sequence {87, 83.4, 79.8, 76.2, …}?

Apath 3 m wide runs around the inside of a square park inside 60 m. find the area of the path. pls

Iq scores for adults age 20 to 34 years are normally distributed according to n(120, 20). in what range does the middle 68% of people in this group score on the test?

Find the actual dimensions of the box. the side length are in meters and integers. the surface area of the box is 104 m2 and volume of the box is 60 m3.