Write a real-world problem that can be represented by the equation 224=3.5r

Create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1.

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?

Which of the following vectors are orthogonal to (2,1)? check all that apply