A detergent company is trying to find a new stain remover ingredient to put in its detergent. Company managers know that baking soda or bleach will be used. They also know that water temperature, cold and warm, affects the stain removal process. An experiment will compare all combinations of these choices. Four types of stains on the same fabric will be subjected to each treatment and scored for stain removal quality. Required:
What is the experimental unit?

4

Step-by-step explanation:

In this experiment, there will be a total of four experimental units. This is because there will be two options either baking soda or bleach and each one of these will have two experimental units when combined with either cold or warm water. Therefore, we can create the following units as such...

Baking Soda + Cold Water

Baking Soda + Warm Water

Bleach + Cold Water

Bleach + Warm Water

These would be the 4 total experimental units in this experiment.

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step-by-step explanation:

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".