-To show the narrator’s sense of adventure
<span>to edit your writing for grammar and punctuation</span>
I believe the colons should be placed as follows:
1. One thought kept crossing Jen's mind as Friday approached:
2. included the following: life, liberty, and the pursuit of happiness
3. cultures:
on the first sentence you are separating her thought from the statement
on the second, you are separating a list from the statement
on the third, you are separating the two different types of cultures from the statement.
I really hope these are correct for you :) good luck!
Yields strength is defined as the stress in psi (pounds per square inch) at which a fastener assumes a specified limited permanent set.