Answer:
17a+10b
Step-by-step explanation:
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c. 19,712
2,816 * 7 = 19,712
4 W = n of songs on her playlist
On Friday because if she danced 11 - negative 4 = 15. and 19 - negative 8=27. the closest would be Friday because on that day she danced for 2.6 hours.
Hope it helps.