Mult. all 3 terms by 5: x + 45 = 20.
Subtr. 45 from boths ides: x = -25 (answer)
Answer:
D. 16
Step-by-step explanation:
Average rate of change: 
Simply plug in 6 for <em>a</em> and 2 for <em>b</em>
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Hi ;-)
10 minutes for 2 songs = 5 minutes per song
10 : 2 = 5