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Musya8 [376]
3 years ago
11

An experiment was conducted to determine how thick a concrete wall needs to be to block out the sound of highway traffic. Which

of the following variables must be controlled (held constant) in the experiment to get the best results
Biology
2 answers:
BartSMP [9]3 years ago
4 0
The material will need to be held constant because the experiment was to determine the necessary thickness of a CONCRETE wall. The height will also be a controlled variable, as will the sound. In short, the only variable that will change is the thickness of the wall. 
andre [41]3 years ago
3 0
Only one sound blocking material should tested at once and the sound will vary on how much and what kind of materail you use.
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Time is scare is the economic concept this dilemma demonstrate.

<h3>Why Time is scare?</h3>

The time is scare because there is an over lap between the team sport or doing the music instruction. This demonstrates that there is not enough time to meet demand.

Two of the tasks require more time than is available. Both team sports and music courses cannot be played because of the lack of time.

Although there is a strong need for time, two things cannot happen at once. The need for time is great, but there is nothing one can do about it; she must choose between the two options presented.

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Hope this helps.

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