I would like some assistance with the following public finance economics question

NB. To differentiate equation 4 , take the log of both sides of the equation

Consider the concave utility possibilities frontier corresponding to: 1/2 U(Norman) + U2 (Edna) = 16 (eq 1) Associated with the Social Welfare Function of the form: U = U(Norman) * U(Edna) Given the utility functions of Norman and Edna as follows: ( Norman) = 19chips + 19 coke (eq 2) U(Edna) = qchips 1/4 * q coke 1/4 (eq3)