Question: Finding values in a differential equation

I will include the work i did, also near the end of the worksheet, there are word descriptions of the questions i did.

Im stuck on the last 3 questions: question 14, 15 and 16. I cant seem to find the values i need for my Ce^-kx

I tried diff it but my syntax is preventing me from going farther.


All help will be appreciated! i will include the original lab for more clarification!



Thank you!

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