The revenue from a bicycle company’s factory in San Diego, CA is given by
4b2-20b+14, where b represents the number of bicycles produced in the factory. The cost in dollars of producing bicycles is given by b2+18b+30. Write and simplify a polynomial expression for the profit from making and selling b bicycles.

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.

Need on this one asap im almost done with this subject

What is the correlation coefficient between the variables? round to three decimal places. enter your answer in the box