\ Need help with finding the formulas to input for the givens (r per sep, t per step, e^r, u, d, etc.) as well as the formulas that will allow me to

Need help with finding the formulas to input for the givens (r per sep, t per step, e^r, u, d, etc.) as well as the formulas that will allow me to work backwards and fill out the binomial tree (CANNOT HAVE HARD INPUTTED NUMBERS)