A computer user has downloaded 19 songs using an online file-sharing program and wants to create a CD-R with 9 songs to use in his portable CD player. If the order that the songs are placed on the CD-R is not
important to him, how many different CD-Rs could he make from the 19 songs available to him?
There are
possible CD-R's.

Which inequality statement describes the two numbers on a number line? "? 7 and a number 5 units to the right of ? 7"

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z

Plz : denver is about 5,200 feet above sea level. which number line best represents this integer?