Answer:
[tex]2\frac{4}{5}\ \ or \ 2.8 \ \ cups[/tex]
Step-by-step explanation:
-The total portion fed to the dog is 7/10 cup
-One week has 7 days. we multiply the dry portion per day by the number of days in a week.
[tex]Dry= Total -Canned\\\\=\frac{7}{10}-\frac{3}{10}\\\\=0.40 \ cup\\\\Dry \ per \ Week= Dry/ day\times days\\\\=0.40\times 7\\\\=2\frac{4}{5}\ or\ 2.8 \ cups[/tex]
Hence, Erin feed her dog 2 4/5 0r 2.8 cups of dry food