Question 2:
The first reason would be given because the information is already given to you.
The second statement would be that angle JKL=90° because that is the definition of a right angle.
Reason 4 would be substitution because you are substituting 90° for angle JKL.
I'm not sure about the last one but I believe it is
measure of angle 1 + measure of angle 2 = 90°
Question 3:
The first statement would be AB is congruent to BC. BC is congruent to DE. This is because this is the information given to you.
The reason for number 3 would be the Transitive property because in the transitive property, it states that "If a=b and b=c, then a=c" which is essentially AB=BC and BC=DE, therefore AB=DE.