Final answer:
The relationship between smoothie size and its price is not proportional because the unit price for each smoothie option is different: $0.75 per oz for the 8 oz smoothie and $0.67 per oz for the 12 oz smoothie.
Step-by-step explanation:
The question is asking whether the relationship between the size of the smoothie and its price is proportional. A proportional relationship means that the ratio between two quantities remains constant. To determine if there is a proportional relationship between smoothie size and price here, you can calculate the unit price for each option and compare them.
For the 8 oz smoothie costing $6, the unit price is $6 ÷ 8 oz = $0.75 per oz.
For the 12 oz smoothie costing $8, the unit price is $8 ÷ 12 oz = $0.67 per oz.
Since the unit prices are not equal ($0.75 per oz vs. $0.67 per oz), the relationship between smoothie size and price is not proportional.