Confidence interval and test statistic hw help

[SqueakyDoors]

Hey all, I'm having trouble with two homework problems on confidence interval and test statistic/ p-value.
I have attached two images showing the question of the problem and my work.

 

[stapel]

I'm seeing four exercises and some scribbling. Please reply with specifics, such as the exercise numbers (and then I guess we'll have to type things out for you) and a clear statement of your work so far. Thank you.

 

[SqueakyDoors]

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Sorry, I forgot to put down which questions

It's questions 17 and 67

 

[SqueakyDoors]

As for the work, I pretty much plugged in the numbers into the formula shown.