Answer:
Third option is the right choice.
Step-by-step explanation:
Manipulate the right hand side.

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9 chairs because 2 to 4 is equal to 1/2 and half of 18 chairs is 9
Answer:
23.6 or 1 4 × π × 8 = 2 π if its not right let me know
Step-by-step explanation:
The age of the person is 36 :) hoped this helped