Agroup of 67 friends meets for lunch. they greet each other by exchanging fist bumps. how many fist bumps are exchanged if each friend must bump with each of the 66 others?

Asap! i'm not good math and i'm lost.

Question 5 of 10 2 points if a population is a sample of the population could be a. registered voters; all citizens o o b. baptists; all religious people o c. people who purchased shoes; all customers o d. the entire school faculty; math teachers

You buy a veido game for $60 and the sales tax is 8% what is the total cost for the game including the sales tax