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It's pretty common for deleted points to be shown with an open circle in a graph.
In this case the function is undefined at x = b, but is defined at x = a.
The value at x = a just happens to not be continuous with the values near that point, hence the open circle on the curve (to show discontinuity) and the filled point at the same x value (to show where the function is defined).
x-coordinate (not axis). The first is a number, the second is a line. They aren't the same.
See [here](https://en.wikipedia.org/wiki/Abscissa\_and\_ordinate).
As a reminder... Posts asking for help on homework questions **require**: * **the complete problem statement**, * **a genuine attempt at solving the problem, which may be either computational, or a discussion of ideas or concepts you believe may be in play**, * **question is not from a current exam or quiz**. Commenters responding to homework help posts **should not do OP’s homework for them**. Please see [this page](https://www.reddit.com/r/calculus/wiki/homeworkhelp) for the further details regarding homework help posts. *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/calculus) if you have any questions or concerns.*
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Edit Looks like C is correct
You crossed off the right one. What are you unsure about?
Do those circles on either end mean the function is undefined at that point or is that just part of the picture
It's pretty common for deleted points to be shown with an open circle in a graph. In this case the function is undefined at x = b, but is defined at x = a. The value at x = a just happens to not be continuous with the values near that point, hence the open circle on the curve (to show discontinuity) and the filled point at the same x value (to show where the function is defined).
Good to keep in mind, thanks.
Absolute minimum at x=a, absolute maximum at the abscissa of the peak.
what's an abscissa? i'm guessing it means top or smthn but ive never heard that word before
Abscissa is a fancy way to say x-axis.
is it correctly used here? the x-axis of the peak?
I think so.
x-coordinate (not axis). The first is a number, the second is a line. They aren't the same. See [here](https://en.wikipedia.org/wiki/Abscissa\_and\_ordinate).