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Sorry I only have 3, today is not my creativity day XD
Answer:
73.4
Step-by-step explanation: Multiply you celsius by 9. Then take that number then by 9. then add by 32
Answer:
None
Step-by-step explanation:
There is no integer equivalent to 91/2, integers can't have a decimal.
However, I assume you would like me to answer 9.5, even though it isn't an integer.
Answer: 
Step by step:

(Used a table of common angles)
Answer:
The son is 20 and the father is 80.
Step-by-step explanation: