Consider the following data for a dependent variable $y$ and two independent variables, $x_1$ and $x_2.$

Round your all answers to two decimal places. Enter negative values as negative numbers, if necessary.

a$.$ Develop an estimated regression equation relating $y$ to $x_1.$

hat$(y)=,+,x_1$

Predict $y$ if $x_1=45.$

hat$(y)=$

b$.$ Develop an estimated regression equation relating $y$ to $x_2.$

hat$(y)=,x_2$

Predict $y$ if $x_2=25.$

hat$(y)=$

c$.$ Develop an estimated regression equation relating $y$ to $x_1$ and $x_2.$

hat$(y)=,+,x_1+,x_2$

Predict $y$ if $x_1=45$ and $x_2=25.$

hat$(y)=$