[tex]\huge\text{Hey there!}[/tex]
[tex]\mathsf{\dfrac{h}{2} + 21 - k\ if\ h=20\ and\ k=89}[/tex]
[tex]\textsf{If h = 20 and k = 89, the SUBSTITUTE it for where they are in the equation}[/tex]
[tex]\mathsf{\dfrac{10}{2}+21 - 89}[/tex]
[tex]\mathsf{\dfrac{20}{2}= \bf 10}[/tex]
[tex]\mathsf{\bold{10}+21 - 89}[/tex]
[tex]\mathsf{10+21=\bf 31}[/tex]
[tex]\mathsf{\bold{31}-89= \underline{ANSWER}}[/tex]
[tex]\mathsf{= \bf -58}[/tex]
[tex]\boxed{\boxed{\large\text{Answer: \huge \bf -58}}}\huge\checkmark[/tex]
[tex]\text{Good luck on your assignment and enjoy your day!}[/tex]
~[tex]\frak{Amphitrite1040:)}[/tex]