Which one doesn't belong 3500 km 3.5m 350 cm 3500 mm

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?

What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83

The measures of ? 1, ? 2, and ? 3 are 40%, 12.5%, and 25% of the sum of the angle measures of the quadrilateral. find the value of x.