800 because 20*4*10=800 which means he works 80 weeks a month for 10 months
[ Answer ]

[ Explanation ]
- Factor:
(a - 3) + q(a - 3)
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- Expand
: 

: 

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Answer:
1
Step-by-step explanation:
Answer: x=55
Step-by-step explanation: 35+35=70. 180-70=110. 110/2=55.