Which of these data sets is symmetrical?

a. 1, 6, 11, 11, 16, 16, 16, 21, 21, 26, 31

b. 1, 1, 11, 11, 16, 16, 16, 21, 21, 26, 31

c. 1, 6, 11, 16, 16, 16, 21, 21, 21, 26, 31

d. 1, 6, 11, 11, 11, 16, 16, 16, 21, 26, 31

Each of the walls of a room with square dimensions has been built with two pieces of sheetrock, a smaller one and a larger one. the length of all the smaller ones is the same and is stored in the variable small. similarly, the length of all the larger ones is the same and is stored in the variable large. write a single expression whose value is the total area of this room. do not use any method invocations.

Jackie purchased 3 bottles of water and 2 cups of coffee for a family for $7.35. brian bought 4 bottles of water and 1 cup of coffee for his family for $7.15. how much does each bottle of water cost? how much does each cup of coffee cost? i need this done

Find the measure of the interior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.