In a chess tournament, each player is in one game with every other player. how many games will be played if there are 7 players

i need work

Charlie tosses five coins.what is the probability that all five coins will land tails up.

Match each set of points with the quadratic function whose graph passes through those points

Megan is making bracelets to sell to earn money for the local animal shelter. it takes her 1/4 hour to pick out all the beads and 1/10 hour to string them.this week, she only has 5 1/4 hours to make bracelets. how many bracelets will megan be able to make?