Two pipes are connected to the same tank. when working together, they can fill the tank in 16 hrs. the larger pipe, working alone, can fill the tank in 24 hrs less time than the smaller one. how long would the smaller one take, working alone, to fill the tank

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.

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28

The value of cos 30° is the same as which of the following?