Answer: They spend 5.368 × 10⁹ all together on ice cream and baby food between 2008 and 2009.
Explanation:
Since we have given that
Amount spent on baby food between 2008 and 2009 =

Amount spent on ice cream between 2008 and 2009 =

We need to find the total amount spend all together on ice cream and baby food.
Total amount would be

Hence, they spend 5.368 × 10⁹ all together on ice cream and baby food between 2008 and 2009.