Which of these groups of relative frequencies will be best represented by pie chart

X+ y = 5 ; x - y =3 solve using linear combination

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?

Which of the following is an example of a rational number? a. π b. √ 9 c. √ 8 d. 3.8362319