A paint manufacturer knows that ultraviolet light can degrade many types of paint. It wants to know which paint composition has the least amount of degradation under ultraviolet light. Three different paint compositions were tested. A wall in a windowed hallway of a paint manufacturing plant was divided into 18 sections, and each of the sections was randomly assigned to one of the three paint compositions. The wall sections were painted and then left to be exposed to sunlight. After 18 months of sunlight exposure, the walls were analyzed to determine the degree of change in pigment of the paint, and the results were compared between paint compositions. What are the individuals in this experiment?

This question uses the experimental study concept.

Doing this, we have that the walls analyzed are the individuals.

First, the concept of experimental study is presented:

In this question:

There is an intervention in the walls, they are painted, using three different paint compositions, and then they are exposed to sunlight, and after that the walls were analyzed, to study the degree of change in pigment of the paint, being compared between different paint compositions.

Thus, since the intervention was in the walls, they are the individuals in this experiment.

A similar question is found at

the functions have the same rate of change i think. i narrowed it down to this answer and "the rate of change of tour 1 is greater" but i got it wrong using that answer so im assuming its the answer above. (this is a question i also answered from the iready site if anyone needs a reference)

it is 28 degrees colder in detroit than philadelphia.

step-by-step explanation:

what number adds to 21

-7 + ? = 21

-7 + 28 = 21

hope it