Any help on these questions will be greatly appreciated

Transposition

e/f=1+r^(2)/1-r^(2) for r

Simultaneous Equations

y=5x-4-2x^(2) and y=6x-7

Indicial Equation

39=fe^(2x)+6e^(5x)/e^(3x)

As I said above any solutions/help with these equations would be greatly apreciated

Thankyou