carlo123

20.01.2021 • 

Mathematics

A biology student wanted to determine if using fertilizer would promote plant growth. One hundred plants were randomly assigned to one of two groups: one that used the fertilizer, and one that did not use a fertilizer. Each plant was planted in the same amount of soil and given the same amount of water and light. Which of the following describes the benefit of using control in this experiment?

By controlling the amount of soil, water, and light in the experiment, we eliminate the need to have a control group.
By controlling the amount of soil, water, and light that may influence the response variable, we reduce variability in the response variable.
By controlling the amount of soil, water, and light that may influence the response variable, we eliminate variability in the response variable.
By controlling the amount of soil, water, and light, the differences observed in the response variable can be attributed to those variables that were controlled.

Ответ:

agm0102

30.06.2021

Mathematics

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This is an arithmetic sequence because there is a common difference between terms, a constant found when subtracting the preceding term from any term in the sequence.  In this case the common difference is 7.

Any arithmetic sequence can be expressed as:

a(n)=a+d(n-1), a=initial value, d=common difference, n=term number

Here we have a=44 and d=7 so

a(n)=44+7(n-1)

a(n)=44+7n-7

a(n)=7n+37, so the 39th term is:

a(37)=7(37)+7

a(37)=266

I am assuming that 44 is the first term, not the 5th term...if 44 was the fifth term let me know and I will edit to reflect that...

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