Use matlab only, show all the steps

4. (25 Points) The activity (r) is a function of the fraction composition (x) for a binary mixture. Estimate the parameters (A and B) using the following activity model and experimental data In(r) = (1 x)? [A + 2(B A) x]. The initial values for A and B in the nonlinear fitting are both 1.0 In( r ) = 0.1686 0.4531 0.3039 0.2770 0.2172 0.3681 . 0.6044 0.0482 0.7255 0.0212 0.0126 0.7776