The expression is
(2+4)-9
You are going to want to cross multiply this, so 5/9 would multiply with 1 and 2/3 would be multiplied by x. Now you have 5/9 = 2/3x. You would divide 2/3 on both sides and get 5/6. 5/6 is your answer.
C = 18n + 45
441 = 18n + 45
441 - 44 = 18n + 45 - 45
396 = 18n
396/18 = 18n/18
22 = n
Therefore, 22 ft of cabinet is made when the cost is $441
It is a pentagon. good day