How do I solve thisProblem $2.$ GLLS Curve Fit

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Three disease$-$carrying organisms decay exponentially in seawater according to the following model:

$p(t)=A{e}^{-1\mathrm{.}5t}+B{e}^{-0\mathrm{.}3t}+C{e}^{-0\mathrm{.}05t}$

Write a MATLAB function that uses general linear least$-$squares to estimate the initial concentration of each organism $,$ and $C)$ with the given dataset and calculate the statisitical measures to quanitfy the quality of the curve fit.

Your function should receive a single input:

A two$-$column matrix with time $t$ in the first column and concentration $p(t)$ in the second column

and it should have the following output:

A $13$ row vector of the fit coefficients $A,B,$ and $C$

The coefficient of determination $("$r$-$squared value"$)$ for the curve fit $($scalar value$)$

The standard error for the fit, ${}_{\frac{p}{t}}($scalar value$)$

Function $*$

function $[$coeff$,$ r$\_$sq$,$ s$\_$yx$]=$P$2\_$concentration$($data$)$

$2\%$write your codes below, do not change the name of the function$\%$

Code to call your function $?$

load P$2\_$data.dat

$[$abc$,$ rSquared, standardError$]=$P$2\_$concentration$($P$2\_$data$)$