A sample of seventh and eighth grade students were asked how many minutes they spent online last night. The results were recorded in the box-and-whisker plots shown. What can you conclude?

A.

Eighth grade students have more variation in the amount of time spent online last night.

B.

Seventh grade students have more variation in the amount of time spent online last night.

C.

The sample size of seventh grade students is less than the sample size of eighth grade students.

D.

The sample sizes are equal.

The linear combination method is applied to a system of equations as shown. 4(.25x + .5y = 3.75) → x + 2y = 15 (4x – 8y = 12) → x – 2y = 3 2x = 18 what is the solution of the system of equations? (1,2) (3,9) (5,5) (9,3)

Astudy was interested in determining if eating milk chocolate lowered someone's cholesterol levels.ten people's cholesterol was measured. then, each of these individuals were told to eat 100g of milk chocolate every day and to eat as they normally did. after two weeks, their cholesterol levels were measured again. is there evidence to support that their cholesterol levels went down? how should we write the alternative hypothesis? (mud = the population mean difference= before - after)a. ha: mud = 0b. ha: mud > 0c. ha: mud < 0d. ha: mud does not equal 0

I’ve been trying all day to figure this puzzle out. i need the work for it aswell. it is a factoring polynomials tarsia. the image is below.