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adrimare

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## Homework Statement

Two related type of questions:

1) A rectangular prismic net enclosure for practising golf shots is open at one end. Find the dimensions that will minimize the amount of netting needed and give a volume of 144 m

^{3}. Netting is only required on the sides, top, and the far end. Height is x, width is also x, and length is y.

2) A rectangular piece of land is to be fenced using two kinds of fencing. Two opposite sides will be fenced using $6/m fencing, while the other two sided will require $9/m fencing. What are the dimensions of the rectangular lot of greatest area that can be fenced for a cost of $9000?

## Homework Equations

A'(x) = 0 for max/min

## The Attempt at a Solution

In both questions, I don't know what to do with the 144m

^{3}or the $9000.

What equations am I supposed to use? I could also use tips on how to make equations for these types of questions.