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okay :/ how do i solve it?

Where did the answer come from? If that is your answer, then you have already solved it.

got it from the lecturer. but i have no idea how to solve it.

okay. go on.

so the top of the rectangle doesnt count?

okay i understand. so then we find dA/dh? and the x remains? after that what?

I am kind of rusty here on implicit differentiation, hopefully you are current.

*h=3

I come up with -3.666 not the approved answer. I will try with the lid!

thank you so much! appreciate your help :)

With the lid I get -5.55 somewhere I've erred, suggest going over it or did you get the -4.4

no i didnt get it :/