As for Question 1f, I assume I have a running pattern of being completely wrong, but here is the FIG 2 I failed to initially post.1a. Looks OK to me.
1b. Wrong units for strain. Strain is dimensionless (and in this case negative).
1c. Be careful with signs and units. 0.002121 is not equal to -2.121 x 10-3. And -2.121 x 10-3 what? You are mixing units too much, and getting confused. I would convert everything into m (and Pa etc.)
1d. Change in length is not 7.75. What length is being referred to? (Why don't you just do it like 1e?)
1e. OK, but what are the units of the answer?
1f. As there is no Fig 2, this is impossible.
And my Answer?