Is one side of a rectangular fish tank best represented by a point, line, plane, or ray?

When you are making a circle graph by hand, how do you convert a number for a part into its corresponding angle measure in the circle graph? when you are making a circle graph by hand, what should you do if one of your angle measures is greater than 180°?

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Acyclist bike x distance at 10 miles per hour .and returns over the same path at 8 miles per hour.what is the cyclist average rate for the round trip in miles per hour ?