Question: need explanation thx Fill in each column with the value of the vari- able after each line of code has run. If the vari- able

need explanation thx Fill in each column with the value of theneed explanation thx

Fill in each column with the value of the vari- able after each line of code has run. If the vari- able has not been declared, write ?. If the vari- able has been declared but not initialized, write *. let x: number = 15; let y: number; x = x + 8; let z: number = 9; y = x + z

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