A biology student wanted to determine if using fertilizer would promote plant growth. The student randomly selected 20 plants and randomly assigned 10 of them to a large square container and the other 10 to a different large square container. Both containers had the same amount of soil and received the same amount of water and light. One container also received fertilizer and the other container did not. Is this a valid experimental design?

Yes, each plant was randomly assigned to the large containers.
Yes, the variables not being measured—soil, water, and light—were controlled.
No, both containers did not receive the fertilizer.
No, the experiment did not use replication of the experimental units.

ok

Step-by-step explanation:

Le m thin abou iLO

-14 is the answer

hope this : ))

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".