Homework Help v1.3

[Denny Crane]

^instead of q, put in 4 instead
so it comes out to 3d(3- [3x4])

[Tammy]

Originally Posted by aka fuku

hello can someone help me with these types of math questions

This is an example

If q=4, what is 3d(4-3q) in terms of d

The book says the answer is -24d but i don't understand how it came to that can someone please tell me how do you work it out i'm really hopeless in math ^-^

=3d(4-3q)
=3d(4-3(4))
=3d(4-12)
=3d(-8)
=-24d


theres the step by step jes incase you're really having problems >.> prob only thing i can do

[illusionist]

aka fuku,
You should be able to look over Tammy's step by step process and understand where he/she got the answer of -24, which is the correct answer.

[aka fuku]

thanks for the help useful ^-^

[Banana_Alchemist]

Help please...

How does the statement " all for one and one for all" apply to large multicelled orgamisms?

[sadated_peon]

Originally Posted by Banana_Alchemist

Help please...

How does the statement " all for one and one for all" apply to large multicelled orgamisms?

do you mean in terms of body dynamics of the large multi-celled organism or social interaction of multiple large multi-celled organisms?

[Entenex]

Originally Posted by Banana_Alchemist

Help please...

How does the statement " all for one and one for all" apply to large multicelled orgamisms?

i think it means that all the cells interact and are dependent on each other. if one were to fail, the whole organism would die.

[Denny Crane]

All cells play a roll in keeping an organism alive.

[Banana_Alchemist]

thanks guys

[Bara]

It can also be used to describe the ecosystem. If there is a break by one organism being taken out, the rest are effected.

[sadated_peon]

Originally Posted by Kazman

All cells play a roll in keeping an organism alive.

no they don’t.

I am sorry but if they were trying to say that a multicelluar orgaism is “all for one, one for all” then it is wrong.

It is definitely not all for one.

Take for example the newt, it can easily loose limbs without any problem to the organism. It will just grow it back. No way is the rest of the body going to sacrafice for this one limb.

Cells in the body work in a hierarchy. Where important cells like the brain/heart/lungs take priority over all others. In fact all will sacrifice themselves to support these higher cells, but in NO WAY will the brain sacrifice itself for a toe.

The body works as a whole, and what is best for the whole is what is done. If you are vital, such as the brain you are given priority, because it contributes to the whole the most.

It is more like one for all, sucks to be you if your not vital.

[Denny Crane]

Originally Posted by sadated_peon

no they don’t.

I am sorry but if they were trying to say that a multicelluar orgaism is “all for one, one for all” then it is wrong.

It is definitely not all for one.

Take for example the newt, it can easily loose limbs without any problem to the organism. It will just grow it back. No way is the rest of the body going to sacrafice for this one limb.


Cells in the body work in a hierarchy. Where important cells like the brain/heart/lungs take priority over all others. In fact all will sacrifice themselves to support these higher cells, but in NO WAY will the brain sacrifice itself for a toe.

The body works as a whole, and what is best for the whole is what is done. If you are vital, such as the brain you are given priority, because it contributes to the whole the most.

It is more like one for all, sucks to be you if your not vital.

the tail is lost for the suvival of the rest of the animal
there is a heirachy, but the cells all work for the survival of the organism to some degree.

[pedrol]

Agreed. Besides, your own cells die all the time. I think the assignment itself is flawed. No multicelular being depends on 1 single cell, or it would die. Cells have a very short life span and are continually replaced.

Edit* Agreed to Sadated P

[sadated_peon]

Originally Posted by kazman3

the tail is lost for the suvival of the rest of the animal
there is a heirachy, but the cells all work for the survival of the organism to some degree.

and when is the brain lost for the survival of the animal?

every cell has some sort of function, but that in no way means that it is all for one.

[smellyfeet]

An Heirachy it is indeed.
The lower, less complicated cells (like the skin) protect the higher, more on the inside of your body, more complex, and more important cells, like the brain, heart, etc.

The more complicated cells are harder to divide and important so the less complex, more easy to regenerate cells take bullets for the more complex cells. Cells that are complictaed take longer to divide, that's why you don't want to get hit on your noggin. You lose brain cells, and they take too long to regenerate and divide.

[Entenex]

i think its more of a ... how hte skin protects the organs and then those organs can work and also provide more skin.

[Banana_Alchemist]

Need help again....

Compare an open and a closed circulatory system.Which one do you think is most efficient? give your reasons


definition on both systems:

Open circulatory system

An open circulatory system is an arrangement of internal transport present in some invertebrates like mollusks and arthropods in which circulatory fluid in a cavity called the hemocoel bathes the organs directly and there is no distinction between blood and interstitial fluid; this combined fluid is called hemolymph (also spelled haemolymph). Muscular movements by the animal during locomotion can facilitate hemolymph movement, but diverting flow from one area to another is limited. When the heart relaxes, blood is drawn back toward the heart through open-ended pores.

'Hemolymph fills all of the interior (hemocoel) of the body and surrounds all cells.

Hemolymph is composed of water, inorganic salts (mostly Na+, Cl-, K+, Mg2+, and Ca2+), and organic compounds (mostly carbohydrates, proteins, and lipids). The primary oxygen transporter molecule is hemocyanin.

There are free-floating cells, the hemocytes, within the hemolymph. They play a role in the arthropod immune system.
[edit]

Closed circulatory system

The circulatory systems of all vertebrates, as well as of annelids (for example, earthworms) and cephalopods (squids and octopuses) are closed, meaning that the blood never leaves the system of blood vessels consisting of arteries, capillaries and veins.

The systems of fish, amphibians, reptiles, birds and mammals show various stages of evolution.

In fish, the system has only one circuit, with the blood being pumped through the capillaries of the gills and on to the capillaries of the body tissues. This is known as single circulation. The heart of fish is therefore only a single pump (consisting of two chambers).

In amphibians and reptiles, a double circulation is used, but the heart is not always completely separated into two pumps. Amphibians have a three-chambered heart.

Birds and mammals show complete separation of the heart into two pumps, for a total of four heart chambers; it is thought that the four-chambered heart of birds evolved independently of that of mammals.

[jinjokitsu]

^lol... it looks like you've pretty much got all the info you need to answer your question there. To answer the efficiency question I think you need to take into account the type of organism. More simple organisms and smaller ones would benefit from having an open circulatory system because the exchange of substances necessary would be occuring over a relatively small area. In larger organisms a closed system is vital because it would be extremely inefficient for an open system to attempt to deal with substance exchange for large organs and large areas of muscle tissue.

any chemists out there who could please help me with this...
Use the data below to explain whether a reaction will occur between the following pairs of chemicals.
a. Fe2+ and Br- b. Fe2+ and (Cr2O7)2- c. Br- and (Cr2O7)2-

(Cr2O7)2- + 14H+ + 6e- > (2Cr)3+ + 7H2O E = 1.36V
Br2 + 2e- > 2Br- E = 1.07V
(Fe)3+ + e- > (Fe)2+ E = 0.77V

> is an arrow for a reversible reaction... i didn't know how to do that on my computer.
the 2+ and 2-, +, - are all ion charges.

[Denny Crane]

they look right
i'm not sure about the E value since i never did that
but the reactions look fine

[action=kazman3]remembers back in the days doing redox crap hated them did i[/action]
i remember the first one all too well
as well as the permangenate one

[canza]

can someone help me factor x^4+8x^2-9