4.A machine that originally had an estimated useful life of 10 years, but after 4 completed years, management decided that the original estimate of useful life should have been 6 years. At that point the remaining cost to be depreciated should be allocated over the remaining: A. 2 years B. 5 years C. 7 years D. 12 years E. 10 years

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.

Somone me i want to know what 18 hours out of 24 hours in a fraction

Iwill give you ! what is the measure of ∠v ?