Liam spends $0.25 for every song he downloads to his cell phone. which of the following represents the number of songs he can download if he has at least $3?

First, we would need to create an equation for this problem. Let x represent the number of songs he can download. 
$0.25x = $3
Or 
$3 = $0.25x

Now, all you would need to do is isolate the x (get it alone). To do this, you would need to divide both sides of the equal sign by $0.25. 
$3 = $0.25x
12 = x

x = 12

Liam could download 12 songs with $3 dollars. 

I hope this helps!