Monday

December 22, 2014

December 22, 2014

Total # Posts: 2,500

**science**

Although most salamanders have four legs, the aquatic salamander shown below resembles an eel. It lacks hind limbs and has very tiny forelimbs. Propose a hypothesis to explain how limbless salamanders evolved according to Darwin's theory of natural selection.
*August 22, 2009*

**Economics**

V pays 20 cents V sells to W for 35 cents W sells to X for 55 cents X sells to Y for 80 cents Y sells to Z for $1.00 Contribution to GDP: (a) 20 cents (b) $1.00 (c) $1.90 (d) $2.90
*July 4, 2009*

**history**

What was the role of the Mayflower Compact in creating the New Plymouth society?
*June 21, 2009*

**math...2 word problems**

36?
*June 17, 2009*

**help me please. easy**

After forty years of intensive research, on school learning in the United States as well as abroad, my major conclusion is: What any person in the world can learn, almost all persons can learn, if they are provided with the appropriate prior and current conditions of learning...
*June 9, 2009*

**maths**

How would you know that the hypotenuse is length 5? Does it have something to do with the ratio?
*June 9, 2009*

**Science Gr 8**

What are two ways in which trees are apart of the water cycle?
*June 4, 2009*

**chemistry need help**

kelvin so c
*June 3, 2009*

**chemistry need help**

i was thinking of b
*June 3, 2009*

**chemistry need help**

In general, which reaction(forward, reverse, or neither) is favored if the value of K at a specified temperature is a. equal to 1? b. very small c. very large
*June 3, 2009*

**chemistry**

sorry i mixed the post with another student but i figure you can help me with one like this
*May 28, 2009*

**chemistry**

would the compound BaSO4 soluble in water as well
*May 28, 2009*

**chemistry**

6.08 moles of HCL
*May 28, 2009*

**chemistry**

is this the correct answer 6.27 g HCl
*May 28, 2009*

**chemistry**

What mass of HCL is contained in 645 mL of 0.266 M solution?
*May 28, 2009*

**physics torque and shelf**

Here's a diagram scriblink (com)/index.jsp?act=phome&roomid=4431&KEY=6AA34A2C2179E9CC6FDC240F66D3F371
*May 22, 2009*

**physics torque and shelf**

Here's a diagram scriblink (com)/index.jsp?act=phome&roomid=4431&KEY=6AA34A2C2179E9CC6FDC240F66D3F371
*May 22, 2009*

**chemistry**

If 20 g KCl is dissolved in 100g of water at 20 degrees C, is the solution unsaturated, saturated, or supersaturated?
*May 20, 2009*

**history**

Did all Southerners fight to protect slavery?
*May 20, 2009*

**history**

i have another question
*May 20, 2009*

**history**

so General George Mead
*May 20, 2009*

**history**

General Joseph Hooker, with General George Mead
*May 20, 2009*

**history**

General George E. Lee
*May 20, 2009*

**history**

Who led the Union troops at Gettysburg?
*May 20, 2009*

**waves and sound**

12
*May 17, 2009*

**physics**

The Weistin Stamford Hotel in Detroit is 228 m tall. Suppose a piece of ice which initially has a temperature of o degrees celcius falls from the hotel roof and crashes to the ground. Assuming that 50% of the ices mechanical energy during the fall and collision is absorbed by ...
*May 17, 2009*

**critical thinking**

does it actually say "crime rates" or "violent crime rates" and are these numbers for the USA only?
*May 13, 2009*

**math**

140*p = 28 p = 28/140
*May 7, 2009*

**Pre-Algebra [repost]**

y=4/3x-2 m=4/3=slope (0,-2) up 4 over 3 = (3,2) (3,2) up 4 over 3 = (6,6) (6,6) up 4 over 3 = (9,10)
*May 7, 2009*

**math**

Does 17*5=85? If so, the answer is a. If not, the answer is b.
*May 4, 2009*

**Physics**

(1) 45 micro coulombs of charge is passed through a wire in 35 seconds. How many electrons does this represent? What is the current in the wire? (2) A piece of copper wire has a resistance of 5 Ohms at 20 degrees celsius. If another piece of copper wire at 0 degrees celsius is...
*May 4, 2009*

**Math**

go hereswagbucks /?cmd=sb-register&rb=208582
*April 30, 2009*

**6th grade**

There are four possible outcomes: HH HT TH TT 1 out of those four outcomes is the case where both coins land heads up. Therefore, p=1/4=25%
*April 30, 2009*

**Algebra**

The only thing that can be factored out is 3x because that's what all of the terms have in common - they're multiples of 3x. So the answer is: 3x(5x^3 - 6x^2 + 7x - 3)
*April 30, 2009*

**math 117**

0.40x
*April 30, 2009*

**Boiling point (DrBob)**

delta T = Kim delta T = the change in boiling (or freezing) point (in degrees Celsius) K= boiling point elevation (or depression) constant for the solvent i = number of ions into which the solute dissociates m = molality (moles solute / kg solvent)
*April 29, 2009*

**Science**

Fly swatters
*April 29, 2009*

**Science**

Rabbits, gophers, mice, prairie dogs, rats, squirrels, antelope, goats, sheep, dead cattle, dead deer, and elk.
*April 29, 2009*

**Science**

Coyote food
*April 29, 2009*

**math pre algebra**

The slope of y=5x-6 is 5 because y goes up by 5 when x goes up by 1. The slope of y=7/2x+5 is 7/2 because y goes up by 7/2 (or 3.5) when x goes up by 1.
*April 29, 2009*

**would richard nixon be the best president**

would richard nixon be the best president if it weren't for the watergate scandal?
*April 16, 2009*

**unit rate**

88students for 4 classes find the unit rate
*April 14, 2009*

**Math**

u cant answer this ? because u dont hav enough info u need to no the total time u were driving ps did u write the ? down correctly
*April 14, 2009*

**Business stats**

I have just started business school and am struggling with this HW problem. any help would be great!!...A certain type of new business succeeds 60% of the time. Suppose that 3 such businesses open (where they do not compete so its reasonable to believe that their relative ...
*April 14, 2009*

**Accounting**

How would the 5-question method in accounting ethics be useful?
*April 9, 2009*

**Buffer Solutions**

A buffered solution is made by adding 75.0g sodium acetate to 500.0 mL of a .64 M solution of acetic acid. What is the pH of the final solution? (Ka for acetic acid, CH3COOH, is 1.8 x 10^-5)
*April 6, 2009*

**computers**

SAM Training 2003. We have this program at school and I wanted to reatke the exam. I can log in but not access the actual training. Is there any way of going around it?
*April 6, 2009*

**Math - Trig**

I need to find the solutions in the interval [0, 2pi for: 2sinx + cosx = 0 Im trying to get it where I can split two things up and set them equal to zero but that can only be done when they are being multiplied to each other, but as you can see they are being added, so they ...
*April 5, 2009*

**Edit**

The Directions should be: "Find a power SERIES whose sum is:"
*April 3, 2009*

**Pre-Cal**

FIND A POWER WHOSE SUM IS: (a) 5 / (1-3x) (b) 9 / (1-4x) (c) 6 / (2-4x)
*April 3, 2009*

**Algebra**

-(3x^2-5y) / (x(x+y))
*April 3, 2009*

**chemistry 106**

a roll of aluminum has a mass of 1.08kg. what is its mass in pounds? (1 lb= 435.6g)
*April 2, 2009*

**calc**

Find x. Supplementary angles with measures 10x+7 and 7x+3. Complementary angles with measures 3x-5 and 6x-40.
*March 31, 2009*

**Math**

How many corners are there on a solid pyramid?
*March 31, 2009*

**social studies**

louisiana purchase
*March 30, 2009*

**algebra**

Y = 19/28
*March 28, 2009*

**algebra**

{2y =8x+6 9x+3y=21
*March 28, 2009*

**Algebra**

non of these are right
*March 24, 2009*

**Physics**

A 2 cm object is placed 42 cm from a screen. Where should a converging lens of focal length 7 cm be placed between them to form a clear image on the screen? What two possible magnifications could the image have? ------------------------------------------------------------ 1/do...
*March 22, 2009*

**Any**

Make a list of your interests and pick which one is your main interest. This will make the research more enjoyable and make it much easier to write a long paper about it.
*March 22, 2009*

**Economics**

If utility is U(x,y) = xy + y, what is the indirect utility function and expenditure function?
*March 19, 2009*

**math**

Why couldn't the two elephants go swimming together?
*March 17, 2009*

**Chemistry**

A .405 g sample of gas contains .0050 moles. What is the molar mass of this gas? Please round your answer to the tenths place. I am confused by this. Molar mass = mass of sample/moles of sample The answer is either: molar mass = .405g/.0050 = 81 g/mol (I dividing mass by moles...
*March 17, 2009*

**Chemistry**

A 0.1300 g iron ore sample was dissolved in hydrochloric acid and the iron was obtained as Fe2+(aq). The iron solution was titrated with Ce4+ solution according to the balanced chemical reaction shown below. After calculation, it was found that 0.0259 g of iron from the ore ...
*March 13, 2009*

**math**

5/6=30/x You can see that 5 was multiplied by 6 to get 30. In order to keep the fraction the same, you'll also have to multiply the 6 in the denominator by 6 to get 36 as your value for x, which in this case represents the height of the tree in feet.
*March 13, 2009*

**chem**

Why do we use excess reactants in a chemical reaction? Why are percent yields usually less than 100%? Is it because we want to maximize the amount of products produced, and reactions usually end up in a loss of reactants to the air, etc?
*March 13, 2009*

**Math**

(2/9)(4/8)=1/9 ( Remember that when you take a marble out, the total goes from 9 to 8 )
*March 11, 2009*

**math**

You open the book to page 24 and 25. (They have to be consecutive integers like the pages in a book). 24*25=600.
*March 11, 2009*

**Chemistry**

An iron ore sample was dissolved in hydrochloric acid and the iron was obtained as Fe2+(aq). The iron solution was titrated with 38.54 mL of 0.471 M Ce4+ solution according to the balanced chemical equation below. Ce4+(aq) + Fe2+(aq) -> Ce3+(aq) + Fe3+(aq). Calculate the ...
*March 11, 2009*

**math6**

how do you know????????????????
*March 9, 2009*

**math6**

whats between 2 1/2 & 3 next questioned whats beetween 3 1/2 & 4
*March 9, 2009*

**math6**

whats between 2 & 2 1/2
*March 9, 2009*

**Math**

asdfghjkllqwertyuiopzxcvbnm
*March 9, 2009*

**physics**

55555577657374383284894270000000 N
*March 9, 2009*

**Chem**

Determine the number of moles of N atoms in 43.5 g of Mg(NO3)2. Textbook answer: 1.43 mol N My answer: 43.5 g Mg(NO3)x x (1 mol Mg(NO3)2/148.313 g Mg(NO3)2) x (2 mol N/1 mol Mg(NO3)2) = .293 Can tell me where i went wrong?
*March 8, 2009*

**Another Chem Problem**

Alright, now I am starting to understand. Thanks!
*March 8, 2009*

**Another Chem Problem**

Calculate the total number of F (Fluorine) atoms in 12.15 mol C2HBrClF3. The answer is 2.195 x 10^25 atoms, but I am not sure how they got there. Can anyone give me a hint how to get started? If needed (i'm not sure), the moleculatr mass of C2HBrClF3 is 197.381.
*March 8, 2009*

**Chemistry**

Calculate the total number of atoms in 0.00102 mol CH3(CH2)4CH2OH The answer in the back of my book says 1.29 x 10^22 but i do not understand how they got to that answer. Will someone please show me how they would set up the problem. I though all you had to do was calculate 0....
*March 8, 2009*

**Math pizzazz worksheet answers**

0mmmmmmmmmmmm
*March 8, 2009*

**Operations Management**

The maintenance department of a hospital uses 816 cases of liquid cleanser annually. Ordering costs are $12, carrying costs are $4 per case a year, and the new price schedule indicates that orders of less than 50 cases will cost $20 per case, 50 to 79 cases will cost $18 per ...
*March 7, 2009*

**Math/ Algebra**

That is the Pythagorean theorem, which states that: in any right triangle, the area of the square whose side is the hypotenuse is equal to the sum of the areas of the squares whose sides are the two legs.
*March 7, 2009*

**Math/ Algebra**

Then that should be your answer
*March 7, 2009*

**Math/ Algebra**

Are you solving for anything? You can rewrite that as: b^2/[(6a^5)(c^3)]
*March 7, 2009*

**math**

Is the second part of that 3^(-2c) or 3^(-2)c?
*March 7, 2009*

**6th grade Math**

Thanks Ms. Sue, you help everyone on everything, your a big help!
*March 2, 2009*

**6th grade Math**

I don't get this question, can someone please explain it, thanks. Heres the question: A lighthouse beacon can be seen 24 mi in all directions. What is the area over which the beacon can be seen? - I think it's circumfrence, but I don't really know what to do. ...
*March 2, 2009*

**physics**

A flight attendent pulls her 78.6 N flight bag a distance of 344 m along a level airport floor at a constant velocity. The force she exerts is 44.8 N at an angle of 64.2 degrees above the horizontal. Find the coefficient of kinetic friction between the flight bag and the floor...
*March 1, 2009*

**math ws**

Hey
*March 1, 2009*

**Chemistry: Molarity**

4.82 mL of a 0.262 M NaOH solution reacts completly with 4.79 mL of HCl solution according to the balanced chemical reaction shown below: HCl (aq) + NaOH (aq) -> NaCl*aq) + H2O (I) What is the molarity of the HCl solution? 4.82 x (1L/1000 mL) = .00482L 4.79 x (1L/1000 mL...
*March 1, 2009*

**Chemistry**

Alright, I see my error. I appreciate the help :)
*February 28, 2009*

**Chemistry**

Aren't you looking for the molarity in this equation. If so, the molarity equation is M = moles of solute / Liters of Solution
*February 28, 2009*

**Chemistry**

Use the dilution relationship (Mi x Vi = Mf x Vf) to calculate the volume of 0.500 M NaOH needed to prepare 500 mL of .250 M NaOH. This is my work ? L Solution = 500mL x (1L/1000mL) = .500L ? mol NaOH = .500 L Solution x (0.250 M NaOH/1 L Solution) = .125 mol NaOH ? L solution...
*February 28, 2009*

**3rd grade math**

the greens family they had 8 people plus 2 they r going to disenyland they have $3.40 and each person cost 38 cents will they hav enough money to go to thier destionation please explain
*February 27, 2009*

**physics**

A mass of .50 kg attached to a vertical spring stretches the spring 37 cm from its original position. The accel of gravity is 9.81 m/s2. What is the spring constant?? Answer in units of N/m
*February 25, 2009*

**biology**

a fatty acids is most closely associated with what?
*February 25, 2009*

**6th grade Social Studies**

Thanks.
*February 24, 2009*

**6th grade Social Studies**

Well, This is my box's [ ] [O] [ ] [ ] [S] [ ] I don't think its frozen. ~Thanks
*February 24, 2009*

**6th grade Social Studies**

Crossword- 3 DOWN The most common type of land in Russia. 6 (Six) boxs.
*February 24, 2009*

**Physics**

You dip your finger into a pan of water twice each second, producing waves with crests that are separated by 0.15 m. a) determine frequency of these water waves in units of Hz?? b) determine the period of these water waves in units of s. ?? c) determine the speed of these ...
*February 24, 2009*

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