My spelling should be corrected now. (bangs head against the table - LOL).

This is an attempt to redo the design based on the 30b calculator (still no programming - yet):
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ES RPN 10-Solver (Edition 2)

XROOT x^2 Phi^-1 >HMS >Polar FUNC
**y^x Sqrt Phi >H >Rect APPS**

ASIN ACOS ATAN 10^x e^x 1/x
**SIN COS TAN LOG LN Pi**
(A) (B) (C) (D) (E) (F)

Last X R-Up Mode Spec Clr Reg
**ENTER R-Down x<>y EEX < --**

Sigma+ COMB PERM x! ClStat
**STO 7 8 9 ÷**

Sigma- % i/Ang Base RAN#
**RCL 4 5 6 x**

Sums Regr r PRED
**Shift 1 2 3 -**

OFF Mean SDev PDev a/b
**ON/C 0 . +/- +**

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In menus, scroll with Roll Down and Roll Up. Use ENTER to choose an option.

FUNC: Enters a function f(x), use the registers as variables - up to 10 equations (0-9), 100 steps each

APPS = cycle through the steps
FUNC = when you are complete

APPS:
1. 2 x 2 or 3 x 3 Simultaneous Equations - prompted
2. Quadratic Equation - prompted
3. Cubic Equation - prompted
4. Evaluate Function X, variables are prompted
5. Root of Function X for Register #
6. Integral of Function X in terms of Register #
7. Derivative of Function X in terms of Register #
8. Sum of Function (Sigma) of Function X in terms of Register #
9. Turn TVM Solver On/Off
0. Solver for TVM variable:

R0 = P/Y (not solvable)
R1 = N
R2 = I/YR%
R3 = PV
R4 = PMT
R5 = FV

Mode:
1. DEG (moved into this menu)
2. RAD (moved into this menu)
3. GRAD
4. ALL
5. FIX
6. ENG
7. SCI
8. Fraction Mark: Decimal or Comma
9. Complex Display Mode: Rectangular or Polar

Base:
1. DEC Mode
2. BIN Mode
3. OCT Mode
4. HEX Mode
5. AND
6. OR
7. NOT
8. XOR
9. 1's Complement
0. 2's Complement

A-F has been moved to the second row as Walter suggested.

Regression:
1. Linear (y = a*x + b)
2. Power (y = b * x^a)
3. Logarithmic (y = a ln x + b)
4. Exponential (y = b * e^(a*x))
5. Inverse (y = a/x + b)

Sums: (Sigma(vars))
1. x
2. y
3. x^2
4. y^2
5. x*y
6. x^2*y
7. x^3
8. x^4

a/b returns a on the x stack, b on the y stack

PRED returns x-hat on the x stack, y-hat on the y stack

Spec (Special):
(I moved the complex number i/angle to the shifted funtion of the 5 key)
1. %CHG
2. ABS
3. ARG
4. REAL
5. IMAG
6. DATE+
7. DAYS