Answer:
The answer is "15%".
Step-by-step explanation:
[tex]x = 26 \pm 6\% \\\\ y = 29 \pm 9\%\\\\z=x \times y \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ Z=(x \pm &x \%)\times (y\pm &y \%)[/tex]
[tex]= 26 \pm 6\% \times 29 \pm 9\%\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ Z=xy \pm (&x+ &y)\%[/tex]
[tex]=754 \pm 15\%\\\\[/tex]
[tex]15 \% \ \ error[/tex]
