Recently, the fish population has been going down because of an oil spill in the ocean. To monitor the current population in a certain region, Danielle collects 84 fish, tags them, and releases them. Later, she collects 480 fish and finds that 16 of them are tagged.

In the diagram below what is the approximate length of the minor arc ab

The length of a rectangular board is 3 feet less than twice its width. a second rectangular board is such that each of its dimensions is the reciprocal of the corresponding dimensions of the first rectangular board. if the perimeter of the second board is one-fifth the perimeter of the first, what is the perimeter of the first rectangular board?

If the square of a positive integer is added to 2 times the integer the result is 48. find the integer.