A school culture task force with seven members from grade 12 and six members from grade 11 is to elect a spokesperson, secretary and representative. What is the probability that grade 11 students will be elected for
all three positions, assuming that all club members have an equal chance of being elected? Give your answer
as a percent, rounded to one decimal place.

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.

Solve the system of equations. y= 2x y= x^2 - 15

Stephen thublin invests $1,000,000 in a 45-day certificate of deposit with 6.55% interest. what is the total interest income from the investment?