Answered
I've been trying to fix an issue with this activity... when you click on the click box "Show signed area", vertical lines appear at the ends of the interval. Can I get rid of these?
Here's the applet:
https://www.geogebra.org/m/kwaegjvp
I've also attached the ggb file.
Thanks,
Chip
Files:
Calculus - FTC.ggb
The same question 
You can set the line thickness of the inequality to zero to make the lines invisible.
chris
Excellent! Thanks!
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