Ten people go to a party. how many dierent ways can they be seated at a round table?

David must install fencing around a lot that is shaped like a right angle.the side of lot that runs east-west is 200 ft long.the side of the lot runs north-south is 125 ft long.calculate how many feet of fencing he will need to surround the entire lot.

Nine more than four times a number is the same as one less than twice the number. find the number?

To determine the number of deer in a forest a forest ranger tags 280 and releases them back