Find the number of ways to listen to 4 different cds from a selection of 15 cds?
a. 1355

b. 2730

c. 360,360

d. 32,760

And explain how you got it so i can understand future problems : 3

The heaviest 16% of all men in weight weigh more than how many pounds ?

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126