Which data set has the widest spread?

data set a: 1, 1, 2, 1, 2, 1
data set b: 2, 2, 4, 4, 3, 3
data set c: 1, 1, 2, 2, 1, 5
data set d: 3, 5, 5, 5, 5, 4

The length of a rectangle plus its width is 25 cm. the area is 156 square cm. what are the length and width of the rectangle? separate the answers with a comma.

Daniel expanded the expression as shown below -2(-8x-4y+3/4)=-10x-8y-11/4 what errors did he make? check all that apply

Which of the following contains a variable?