A+b is less than or equal to 50
There is 21 possible toppings for 3 hamburgers
Answer:

Step-by-step explanation:
Given:

Let us assume that this equation is equal to 0.
Hence 
Now Solving the above equation we get,

Hence by solving the equation we get 
The average income for the household that is surveyed should represent the sample data is not relevant.
The information that should be considered as follows:
- The level of the income of the household represents the parameter of the population.
- The total income for the household that is surveyed represents the statistics of the sample.
- The household i.e. surveyed is relevant for the sample of the total population that lives in the zip code.
Therefore we can conclude that the average income for the household that is surveyed should represent the sample data is not relevant.
Learn more about the income here: brainly.com/question/14732695