The number of roses purchased is proportional to the total cost as modeled in the graph shown. Four roses cost 55 as represented by Point R. Total Cost of Roses 25 20 15 Total Cost (dollars) 10 R. an 0 0 4 8 12 16 Number Purchased What is the cost of one rose? O $1.25 O $2.50 ​

Determine whether the samples are independent or dependent. upper a data set includes the morning and evening temperature for the lasta data set includes the morning and evening temperature for the last 90 days.90 days.

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.

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are: