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8-28.

Regarding horizontal or vertical rectangles... Is there a top function and a bottom function?
Or, is there a left-most function and a right-most function?
If it's the former, use vertical rectangles (and keep the equations written in y = ______________ form).
If it's the later, use horizontal rectangles (and keep the equations written as x = __________________ form).

Regarding the graph of x = − y² + 4...
In order to visualize this graph, you should not have to rewrite the equation in y = ___________________ form.
You should know that it will look like a sleeping (sideways) parabola with vertex at x = 4.
The negative indicates that the parabola opens to the left.

Might as well be consistent and write the first function as x = ______________ as well.
Regarding horizontal or vertical rectangles...
Refer to the hint in part (a).