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Recently Posted Questions

Posted in Geography

Describe how the Hawaiian Islands were formed and how they are evidence for mantle plumes.

 Hawaiian Islands are volcanic islands so they were created by underwater volcanoes and as they erupted, the land was created.

Posted in Social studies

What is the historical significance of a republic

Republic comes from the Latin word "respublĭca" which means; "Thing publishes" or "I publish it".

In its initial consideration, the republic was considered as a form of government in which the country is conceived as something of "public" character, that is, the governors cannot establish the privatization of the country's assets. Also, the main powers within the republic could not be inherited as it happened in the monarchy, on the contrary, they should be chosen by the people.

I hope this information can help you.

Posted in Biology

How do plant populations in a community change over time?

Plant populations in a community can change over time. This is also known as Evolution or Succession. Communities of plants are established and then change over time as the external environment in which they live changes. The external environment can change in the following ways: 1.    Climate changes: e.g. drought conditions, floods and global warming. 2.    Increase or decrease in animal and human population e.g. some plants are eaten by herbivorous animals and people. 3.    Ecological Disasters affect the growth of plants in a community. For example, the Wild Flower population in the Western Cape region of South Africa regenerates itself through fire. If wildfires do not occur, the wildflower population dies out. On the other hand fire also destroys large forested areas and the plants take a while to regrow, if ever. This is just a small sample of how plant populations change over time. 

Posted in Mathematics

6 divded by 2/3 = what

You keep the first number the way it is, and multiply by the reciprocal of the second number so:

6/1 * 3/2

6*3=18
1*2=2

So then you have 18/2 which is 9

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Posted in Chemistry

What are three physical properties of aluminum foil

Aluminum foil is a metal so it has the typycal properties of metals. These are the three most representative properties of metals that aluminum foil exhibit:


1) It is good conductor of electricity: this property is consequence of the metallic bond, which permits that the outermost electrons of each atom can flow through the entire network of atoms conducting the electricity.


2) Is is good conductor of heat: this other property of metals is due to transmission of vibration that is carried out between neighboring atoms.


3) it is ductile: this property means that the metals can be formed into foils.


Other properties that can be mentioned are: solid at room temperature and mallealble (can form wires)

Posted in Chemistry

What are 3 physical properties of aluminum foil

Solid, ductile (can conduct heat), malleable (can be shaped differently).

Posted in Mathematics

A grade has 81 girls and 72 boys. The grade is spilt into groups that have the same ratio of boys to girls as the whole grade. How many girls are in a group that has 16 boys?

There are 81 girls to every 72 boys in total, which can be represented by 81/72, which put into decimal form, is 1.125. If you then take the number of boys in the group, 16, and multiply it by this number (because the problem states that the ratio is constant) you can find the number of girls in the group.

16*1.125=18

So there are 18 girls in a group with 16 boys.

Posted in Mathematics

what is 7/5 as a decimal number

To convert a fraction to decimal simply divide the top number by the bottom number. This would give you 1.4. Hope this helped!

Posted in Chemistry

Why does land heat up more faster than water?

 if you go to a desert and your in the middle of nowhere you get thirsty and have no water and need to find water to drink so the sun is the reason it heats faster than water in the desert


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Posted in Mathematics

How does 4/15=14/n? What does n equal?

4/15 = 14/n

4 * n = 14 * 15

4n = 210 / : 4

n = 52,5

Posted in Mathematics

C(squared)L(squared) + 100v(squared) = 100c(squared)I have to solve for L

First subtract 100v² from both sides to get:

C²L²=100c²-100v²

Then divide both sides by C²:

L²=(100c²-100v²)/C²

Then take the square root of both sides:

L=+ or - the square root of (100c²-100v²)/C²

Posted in Mathematics

Search results for "A shipment of 18 cars, some weighing 3,000 pounds, and the others weighing 5,000 pounds each. Together the shipment has a total weight of 30 tons. (60,000 lbs). Find the number of each kind of car."

The best way to solve a problem like this is to set up two equations. First assign a variable to each thing you are trying to find. In this case, it's two different kinds of cars. Let's call the cars that weigh 3,000 pounds x, and the ones that weigh 5,000 y. The two equations you should write are:

 x+y=18 (because the problem tells you there were 18 cars in total)
3000x+5000y=60000 (because that is the total weight in the problem)

Next, you need to solve for one of the variables. I will solve for x first by subtracting y from both sides of the first equation.

x=18-y

Then you have to plug that into the other equation to get:

3000(18-y)+5000y=60000

Simplify and solve for y:

54000-3000y+5000y=60000
54000+2000y=60000
2000y=6000
y=3

Now that you know what y equals, you can put it into the equation we solved for x:

x=18-3
x=15

So there are 15 cars that weigh 3000 pounds and 3 that weigh 5000.

Posted in Chemistry

What kind of particles make up compound


compounds are composed of elements

elements are composed of sub atomic particles such as electrons and proton

Posted in Mathematics

What is the quotient of -1 4/5 and 2 1/4?

- 1 4/5 : 2 1/4 =

= - 9/5 : 9/4 =

= - 9/5 * 4/9 =

= - 1/5 * 4/1 =

= - 4/5

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Posted in Chemistry

Explain fajan's rule

Fajans' Rules are used to predict whether a chemical bond will be covalent or ionic. 
This depends on: 
- the charge on the cation 
- the size of the cation 
- the size of the anion 


Posted in Mathematics

what is the side length of the smallest square plate on which a 24-cm chopstick can fit along a diagonal without any overhang???!!!!!!!

A square is basically two triangles put together and since a square has four right angles you can use the Pythagorean Theorem to do this.

A squared +b squared <24
5 squared x 5 squared = 25

Sooooooo...... ;)
Get it?

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Posted in Mathematics

Two numbers are in the ratio 3:2. If the smaller number is 24, find the larger number

3:2
3x - first number
2x - second number

2x = 24 / : 2
x = 12

3*12 = 36

answer: the larger number is 36.

Posted in Mathematics

what is: x + 3 - 2x -1 = 4 5 3

(x + 3)/5 - (2x - 1)/3 = 4 / * 15

3(x + 3) - 5(2x - 1) = 15 * 4

3x + 9 - 10x + 5 = 60

7x = 60 - 9 - 5

7x = 46 / : 7

x = 6 4/7

Posted in Geography

The contour interval is a measurement of ????

Contours are what tell you how steep a hill/mountain is. The closer the lines are together, the steeper the gradient; the farther apart, the less the gradient.

Posted in Mathematics

How do you convert a negative fraction into a decimal

Just divide the top number of the fraction by the lower number and put a negative symbol in front of the decimal figure.

Example:

-1/4 =. 1divided by 4 = .25 = -.25

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