I'll solve problem 3 (I think it's what you're asking)
All the ones you answered on problem 3 are correct.
I'll solve the rest
c) KM = 26
The diagonals of a rectangle are congruent.
If the measure of one diagonal is 26 (which is 13 + 13), the other one is 26.
d) m∠KLM = 90
It's a rectangle! It's supposed to have 4 corners with right angles.
∠KLM is a corner of the rectangle
f) m∠LJM = 22
Subtract 68 from 90 since you know ∠LJK = 68
90 - 68 = 22
Question 1, 2, and 4 is a bit hard to see.
Have an awesome day! :)