Is there a way to figure it with just a cm 5 calculator? Thanks for the advice

There is no reason your CM5 will not work for these calculations. When you solve for the Rafter Lengths, it gets a little involved. Take notes!

24" (Rise)/8 (Pitch w/lower height) = 3, Adjusted Span is 3' less from lower plate, 8 Pitch side.

59' 2" - 3' = 56' 2" (Span @ Equal Plate Height)

56' 2" - 1-1/2" (Ridge Thickness (?)) = 56' 0-1/2" (Effective Span)

56' 0-1/2" / 17 (Sum of Pitches) = 3' 3-9/16"

((3' 3-9/16" x 9) (= 29' 8") + 3') = 32' 8" (Effective Run, 8 Pitch side) Rafter Length = 39' 3-1/8"

(3' 3-9/16" x 8) = 26' 4-1/2" (Effective Run, 9 Pitch side) Rafter Length = 32' 11-5/8"

*Assuming Ridge is 1-1/2" thick and HAPs are equal. (Rafters are of equal width ?)

I believe that Nick's dimensions (posted above) taken from his SU drawing are correct and the Ridge Line is where he says it is. However it should not be referred to as a Center Line, it is just the Ridge Line as this is where the planes will meet, and it is not centered, and nothing is centered on it either, for instance, "the ridge thickness" is not divide by 2. It too, is divide by 17 (The sum of the Pitches) and multiplied by each pitch tell you how much each pitch occupies of that space. Removing it from the equation will automatically place the Ridge in its proper place w/o having to bevel the ridge to make it plane at its equally divided Center Line.