Find the mean and range,
18 23 10 39 22 17
16
15
mean = 20; range = 29
mean = 20; range = 32
mean = 18.1; range = 28
mean = 21.9; range = 29

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Line u passes through points (-52, -18) and (-29, 53). line v passes through points (90, 33) and (19, 56). are line u and line v parallel or perpendicular?