Given:
Let the cost of chocolate bar be 'x'.
Cost of chocolate bar is $0.55
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They are all perfect squares
(9x+2)(9x+20
(9x+2)^2
240÷15=16 seats at each table
Since there were 15 tables and 240 in total you have to divide to find the number of seats at a table
The 3 are both negative and the 4 are high positive