The answer is in the photo below
3a-5=-14
+5 +5
3a=-9
/3 /3
a=-3
Matt paid $70 for mp3 player.
Step-by-step explanation:
Given,
Cost of mp3 player = $149.99
Discount = 20%
Amount of discount = 20% of 149.99
Amount of discount = 
Amount of discount = 0.2*149.99
Amount of discount = $29.99
Sale price = Cost of mp3 - Amount of discount
Sale price = 
Rebate = $50
Amount paid by Matt = sale price - rebate
Amount paid by Matt = 120-50 =$70
Matt paid $70 for mp3 player.
Keywords: subtraction, percentage
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X = 10 because if you multiply everything by 2 you get x + 2 = 12. X = 12- 2 which is 10
The percentage of tax is 6%