Peter R. answered 09/06/23
Experienced Instructor in Prealgebra, Algebra I and II, SAT/ACT Math.
If n is the number of songs, then n x $1.39 would be the download cost for n songs.
If the limit is $15.00, then the equation for the number. of songs she can download would be 15 = 1.39n, solve for n.
You asked for an equation, but it could also be written as an inequality: 15 ≥ 1.39n, where n is positive value..