Suppose you have three concentric circles and are looking at the arc lengths of a 20° angle of each. If the radii of the circles have a ratio of 2:3:9, what is the ratio of the arc lengths? The ratio of the arc lengths will be 2:__:__
(use ascending order. Type integers or simplified fractions.) ​

Jeffery conducted a survey in his school and found that 30 of the 50 eighth grade students' favorite subject is mathematics. based on the results, jeffery concluded that out of the 200 students in his school, 120 students' favorite subject is mathematics. select the statement that is true about jeffery's conclusion. a. jeffery's conclusion is not valid because the sample was biased since only 200 students were surveyed. b. jeffery's conclusion is valid because the sample was random since all of the students were eighth grade students. c. jeffery's conclusion is valid because the sample was random. d. jeffery's conclusion is not valid because the sample was biased since all of the students were eighth grade students.

Aline has a slope of and a y-intercept of –2. what is the x-intercept of the line?

Oliver had $50 on the day before his birthday. after he recived some money for his birthday , he had $75. write and solve eqaution to find how much money oliver received for his birthday. x+50=75