A nonprofit analyst seeks to determine which variables should be used to predict nonprofit charitable commitment, a nonprofit organization commitment to its charitable purpose. Two independent variables under consideration are Revenue, a measurement of total revenue, in billions of dollars, as a measure of nonprofit size $x_1$ and Efficiency, a measurement of the percent of private donations remaining after fundraising expenses as a measure of nonprofit fundraising efficiency $x_2.$ The dependent variable $Y$ is Commitment, a measurement of the percent of total expenses that are allocated directly to charitable services. Both variables $x_2$ and $Y$ are encoded as percents. Data are collected from a random sample of $95$ nonprofit organizations, with the results provided in the accompanying table. Complete parts $($a$)$ through $($c$)$ below.

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a$.$ State the multiple regression equation.

$($:hat$(Y{)}_i=+()x_{1i}+1$