In a round-robin tournament with n teams, the number of games that must be played is (n^2-n) / 2. How many teams are in a round-robin tournament in which 55 games are played?

A circle has its center at (1, 4) and a radius of 2 units. What is the equation of the circle? (x - 1) 2 + (y - 4) 2 = 4 (x + 2) 2 + (y + 4) 2 = 2 (x + 1) 2 + (y - 4) 2 = 4 (x - 1) 2 + (y - 4) 2 = 2 Last one or something else?

You hike uphill of 200 feet per minute. Your friend hikes a downhill on the same trail at a rate of 250 feet per minute. How long will it be until you meet?

A salad recipe calls for 1 3/4 cups of chopped tomatoes. The recipe calls for 4 1/7 times as many cups of lettuce as tomatoes. How many cups of lettuce do you need for this recipe? 4 1/7 cups 4 3/28 cups 7 1/4 cups 7 1/7 cups

Donna, Neil, and Frank are siblings. Donna is the oldest. Frank's age is 1/4 of Donna's age. Right in equation to represent Frank's age F if Diana's age is D years.

Which number added to - 162gives the sum of + 162

Matthew wants to shoot up the school he has 3 guns he only has 4 magazines for each gun he wants to have 4 more mags with 9-11 bullets

Use prime factorization to find the gcf of 24,48

Find the median of 3,7,2,9,4,7,3,7,5,2

4x-4=4x + what equals no values of x

Rena spent 6 days reading her book completing the same fraction of the book each day, she read a total of 8/9 of her book what fraction of her book did she complete in 6 days?