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May 2010 TZ 2 Paper 2 Question

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I've attached a picture of the problem. I have figured out (a) and (b) and I understand WHAT to do to get to the answer for © with the inequalities. And then I graphed the derivative on my nspire. I just can't figure out how to set the y-value to 10 000 to find the x-value. I tried putting a point on the graph and then typing 10000 into the y-coordinate but it wasn't working..

 

If anyone could help ASAP, I would be very grateful. Thank you!

 

 

Edit: I figured it out, but thank you regardless :)

post-132379-0-18270800-1431458309_thumb.

Edited by IbTrojan

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