The dot plot shows the number of hours, to the nearest hour, that a sample of 5th- and 7th-grade students spend watching television each week. How do the medians compare? The 5th-grade range is . The 7th-grade range is . The ratio of variation of 5th grade to 7th grade is .

addition

step-by-step explanation:

to complete this square you have to rotate about the origin 270 degrees clockwise.

your answer is  

a.

5

step-by-step explanation:

there is only one way to arrange all the eight relative to each other because they are not distinct. we have

now there are nine places to place an (and not more than one in one place).   because we have four symbols, we need to choose four of these nine places to insert an . order does not matter because the are not distinct.

thus there are 1 · c(9,4) ways, or, if we calculate it,

thus there are 126 ways to form such "words."