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11.25, the length is 11.25

Step-by-step explanation:

The dimensions are 4 2/3, 6 2/3 and ? if you multiply them, they equal 350

let ? = x

4 2/3 * 6 2/3 * x = 350

Multiply 4 2/3 and 6 2/3

31 1/9 * x = 350

divide both sides by 31 and 1/9

x = 11.25

to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart