Graph and functions

[echo otter]

I'm struggling getting the right answer with B, the answer is 1/3 but I'm not getting that answer

[manic cradle]

1. Do not ping the Moderators, unless someone is breaking the rules.
2. Do not ping the Helper Moderators, unless there is a conflict between helpers.
3. Do not ping other members randomly for help.
4. Ask your question and show the work you've done so far. If you've posted a screenshot of a question, specify which part you need help with.
5. Wait patiently for a helper to come along.
6. If the Helper has answered your question, remember to thank them with the Mathematics Ranks bot and close the thread with:

+close
Feel free to nominate the person for helper of the week in #helper-nominations
If you're happy with the help you got here, and the server overall, you can contribute financially as well:

[echo otter]

And here's my work

[old nymph]

f'(4) = -2/3

[echo otter]

You just solved all of my problems.....

[echo otter]

+close

[little sierra]

Please thank your Helpers before closing!

Please thank the helpers who assisted you by clicking the buttons below. You can thank each helper only once. Once you're done, click "Close Post" to close this thread.

[little sierra]

Thank you for your feedback! Omegabet_ has been awarded 1 . They now have 850 . They have 3 daily left for today.

[little sierra]

@echo otter

<:HelpIcon:1304095958283321385>| Help Reminder

Hello salteabun, this is a friendly reminder that your help request has been inactive for more than 24 hours. If you no longer need assistance, please consider closing the thread using the +close command. This thread will be automatically closed in 3 days if it remains inactive.