First, we have to round the number to the nearest whole number, so:
[tex]\begin{gathered} 9\frac{3}{4}\approx10 \\ 8\frac{1}{4}\approx8 \end{gathered}[/tex]Second, we have to sum the numbers, so:
[tex]9\frac{3}{4}+8\frac{1}{4}\approx10+8=18[/tex]The result is 18.