The first one is the right answer
An iterated integral is the outcome of taking integrals toward a function of more than one variable in such a way that part of the variables is treated as constants for each of the integrals.
From the given parameters, we are to write out five iterations for a triple integral;

where;
- the region is bounded by 0 ≤ z ≤ y, 0 ≤ y ≤ x², 0 ≤ x ≤ 8.
Thus, since x, y, z are functions of at least one variable, we can have the following iterations:
Learn more about iterated integrals here:
brainly.com/question/7009095
From the second:
2x-y=4
x=(4+y)/2 and applying this to first:
4+y+3y=12
4y+4=12
4y=8
y=2 and since x=(4+y)/2, x=3 so
x+y=2+3=5
Just factor 48 factors. It has many.
2 * 2 * 12
3 * 2 * 8
4 * 4 * 3
1 * 2 * 24
And the factors given above can have the height and the smallest of the other factors interchanged.
So 3 * 8 * 2 is not the same thing as 3 * 2 * 8 although your teacher may argue that they are the same. All you have to do is put a different face on the bottom to make the height and width different.
Other teachers would say they were different. I have given you what you requested, so I think you are done with this question.