Originally Posted by

**softballchick** A rectangular storage container with an open top is to have a volume of 30 cubic meters. The length of its base is twice the width. Material for the base costs 13 dollars per square meter. Material for the sides costs 9 dollars per square meter. Find the cost of materials for the cheapest such container.

Total cost = ________________dollars

i got about $234.

i am pretty sure I did all the steps right.

First I got the equation which is C=13Lw+6LW+6WH

got it to one variable

26w^2 + 18w(30/2w^2)

derived and set equal to zero

Found W

and then plugged it in.

Did I do something wrong?