At her health club, elke likes to use exercise bikes and weights. she spent 3/4 hour on the bikes and 1/5 hour less than that on the weights. how much time does she spend on the weights? simplify answer if possible

If 90° < θ < 180° and cotθ = -1/3, then cscθ =

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.

What is the y intercept of f(x)=(1/2)^x?