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2 years ago

What are the levels of ecology

Advanced Placement (AP)

1 answer:

Kay [80]2 years ago

8 0

Answer:

Within the discipline of ecology, researchers work at five broad levels, sometimes discretely and sometimes with overlap

Explanation:

organism, population, community, ecosystem, and biosphere.

Hope it's helps you

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In his research, Dr. Caulfield wants to compare levels of test anxiety among high school students in grades 10 and 12. His hypot

Nina [5.8K]

I think it operational

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3 years ago

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Surface Area of a can is 517.8 cm^2. Maximize the volume of this can using the measured surface area.

mafiozo [28]

Answer:

$r = 5.24$ --- Radius

$h = 10.48$ --- Height

Explanation:

Given

Object: Can (Cylinder)

$Surface\ Area = 517.8cm^2$

Required

Maximize the volume

The surface area is:

$S.A = 2\pi r^2 + 2\pi rh$

Substitute 517.8 for S.A

$517.8 = 2\pi r^2 + 2\pi rh$

Divide through by 2

$258.9 = \pi r^2 + \pi rh$

Factorize:

$258.9 = \pi r(r + h)$

Divide through by $\pi r$

$\frac{258.9}{\pi r} = r + h$

Make h the subject

$h = \frac{258.9}{\pi r} - r$ --- (1)

Volume (V) is calculated as:

$V = \pi r^2h$

Substitute (1) for h

$V = \pi r^2(\frac{258.9}{\pi r} - r)$

Open Bracket

$V = 258.9r - \pi r^3$

Differentiate V

$V' = 258.9 - 3\pi r^2$

Set V' to 0

$0 = 258.9 - 3\pi r^2$

Collect Like Terms

$3\pi r^2 = 258.9$

Divide through by 3

$\pi r^2 = 86.3$

Divide through by $\pi$

$r^2 = \frac{86.3}{\pi}$

$r^2 = \frac{86.3*7}{22}$

$r^2 = \frac{604.1}{22}$

Take square root of both sides

$r = \sqrt{\frac{604.1}{22}$

$r = 5.24$

Recall that:

$h = \frac{258.9}{\pi r} - r$

Substitute 5.24 for r

$h = \frac{258.9}{\pi * 5.24} - 5.24$

$h = \frac{258.9*7}{22 * 5.24} - 5.24$

$h = \frac{1812.3}{115.28} - 5.24$

$h = 15.72 - 5.24$

$h = 10.48$

Hence, the dimension that maximize the volume is:

$r = 5.24$ --- Radius

$h = 10.48$ --- Height

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3 years ago

How was the contemporary legislative branch responded to factions? Note both positive and negative examples please

patriot [66]

They pass laws and stuff thats there main job they work for the people

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3 years ago

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Zach works at the Verizon store and wonders if iPhones last longer if the screen brightness is

algol [13]

Explanation:(a) Was this an observational study or an experiment? Explain your reasoning. Experiment, because certain variables were controlled (he sets the screen brightness to low and then starts a movie) to determine if iPhones last longer if the screen brightness is set to low, and it proves the cause and effect relationship.

(b) What is the explanatory variable and the response variable? Response Variable- To determine if iPhones last longer if the screen brightness is set to low Explanatory variable- he sets the screen brightness of 10 of the iPhones to high and starts a movie, then the other 10 to low and starts a movie.

(c) Was a random sample used to collect the data? Yes- “he selects a random sample of 20 brand new iPhones”

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Write a paragraph (three to five sentences) to explain how your allocation of Marc and Julian's portfolio matches their investme

Murrr4er [49]

If a person has an investment goal of putting in $4000 in a business, then:

He would have to make a good budget and not to engage in actions that would sabotage this goal.

<h3>What is an Investment Goal?</h3>

This refers to the plans and objectives of a person as he is making investments of his capital or any other factor of production in a given venture.

With this in mind, we can see that if a person makes an investment plan, then it is only wise and practical that his spendings and allocation of resources is consistent with this investment plan.

Please note that your question is incomplete so I gave you a general overview to help you get a better understanding of the concept.

Read more about investment goals here:
brainly.com/question/2801397

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