The radius, r , of a sphere is 4 . 3m Calculate the sphere's volume, v . Use the value 3.14 for sqaure, and round your answer to the nearest tenth. (Do not round any intermediate computations.)

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.

Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income

Precalculus question, image attached.