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100?

no - what is the area of a square if its side length is equal to x?

I don't get it

|dw:1350248149705:dw|

Oh, A=x^2

:)

Derivative, right?

yes

dA/dt=2x(dx/dt)

perfect!
almost there now...

now, when the area is 150 cm^2, then what would the side length of the square equal?

i.e. what is the length of the side of a square if its area is 150 cm^2?

sq rt of 150?

yes

So you would plug in x and dx/dt to get dA/dt?

yes - you have it now - well done! :)

Yay, thank you! :)

yw :)

I would ask for more help, but it's okay.

?

I don't really understand related rates.

Okay, thanks again :D