The answer is a population.
Answer:
In this, the controlled variables are stirring and type of sugar. As more stirring might elevate the amount of sugar that dissolves, and different kind of sugars might dissolve in distinct concentrations. So, in order to make sure a fair test, there is a need to keep these variables similar for each cup of water.
Explanation:
The warm water sinks and travels to areas where the water is cold then rises again. The cycle repeats.
Y+13=-3(x-1) is the answer
