Suppose we fit a curve with basis functions:

$[$ b$\_1($X$)=($X$+3)$ I$($X$<0)+($X$-3)$ I$($X $>=0)$; b$\_2($X$)=$X$^2$ I$(0<=$ X $<=5)+$I$(3<=$ X $<=5)]$

We fit the linear regression model Y$=\backslash$beta $\_0+\backslash$beta $\_1$ b$\_1($X$)+\backslash$beta $\_2$ b$\_2($X$)+\backslash$epsi a

$[\backslash$beta $\_0=1$; $\backslash$beta $\_1=1$; $\backslash$beta $\_2=1]$

What is the value of Y when X$=4?$