A computer user has downloaded 25 songs using an online file sharing program and wants to create a CD-R with 11 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 25 songs available to him?

3-12. write each answer with a reasonable number of figures. find the absolute uncertainty and percent relative uncertainty for each answer. (a) [12.41 (±0.09) + 4.16 (±0.01)] x 7.068 2 (±0.000 4) =? (b) [3.26 (±0.10) x 8.47 (±0.05)] - 0.18 (±0.06) =? (c) 6.843 (±0.008) x 104 + [2.09 (±0.04)- 1.63 (±0.01)] =?

Labc is reflected across x = 1 and y = -3. what are the coordinates of the reflection image of a after both reflections?

Which ordered pair is a solution of the equation? 2x+3y=10