Answer
$7.80
Explanation
He bought 4 for $5.20. Divide 5.20 by 4 to get the price for one pack. Then multiply $1.30 by 6 to find the price of 6 packages.
Answer:

Step-by-step explanation:
All work is shown above.
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Answer:
(r^9-s^10) (r^18+r^9 s^10 + s^20)
Step-by-step explanation:
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