In a huge chess tournament, 45 matches were played. find out how many people were involved if it is known that each participant played one game with every other participant in the tournament.

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Agarden consists of an apple tree, a pear tree, cauliflowers, and heads of cabbage. there are 40 vegetables in the garden. 24 of them are cauliflowers. what is the ratio of the number of cauliflowers to the number of heads of cabbage?

In the diagram of circle o, what is the measure of zabc?