its delta math please help

[tex]\huge\textsf{Hey there!}[/tex]
[tex]\huge\textsf{10y - 3z}[/tex]
[tex]\huge\textsf{= 10(8) - 3(8)}[/tex]
[tex]\huge\textsf{= 80 - 24}[/tex]
[tex]\huge\textsf{= 56}[/tex]
[tex]\huge\textsf{Therefore, your answer is: 56}[/tex]
[tex]\huge\textsf{Good luck on your assignment \& enjoy your day!}[/tex]