Friday

January 30, 2015

January 30, 2015

Total # Posts: 3,335

**chemistry **

I have to calculate the vapor pressure of water at 25.0 degrees celicus. The heat of vaporization of water is 40.65 kj/mol and the vapor pressure of water is 92.7 Torr at 50 degrees celcius. I know I should use log10 P=A- B/C+T but I don't know how to work it out.
*January 30, 2015*

**combination probability**

Thank you!
*January 24, 2015*

**combination probability**

I am looking for the number of ways you can draw 4 marbles to have an equal number of red and white marbles after the draw. I was using combination probability set up as 6C2*7C2 = 315 but this doesn't include the probability of the 5 blue marbles. I'm not sure how to ...
*January 24, 2015*

**combination probability**

A bag contains 6 red, 7 white and 5 blue marbles, how many ways can four marbles be picked where there are an equal number of red and white marbles? Is it 315 ways?
*January 24, 2015*

**math**

if I save 3200 for 40 years with 9% interest rate how much will I have saved
*January 24, 2015*

**English Riddle**

THANK YOU!!
*January 20, 2015*

**English Riddle**

my hands constitute my career. when i was young, i practiced for hours to master the great composers. I decided long ago that "tickling the ivories" would be the key to my success. Who am I? Please help! I came up with "piano" but im not sure...
*January 20, 2015*

**SCIENCE**

IF THERE WAS A ZERO CHANGE IN EARTHS ECCENTRICTY, HOW MIGHT THAT AFFECT THE POSSIBILTY OF AN ICE AGE/
*January 20, 2015*

**math **

the average annual rainfall for a town is 43.2 inches. I know the monthly rainfall has to be 3.6 inches. the difference of a given month's rainfall from the average monthly rainfall is called the deviation. what is the deviation for each month shown? may 2 3/5 inches, june...
*January 17, 2015*

**math**

earned $296.00 and worked for $8.00 per hour. how many hours did she work?
*January 12, 2015*

**History**

Legacies (Short and long term impacts/consequences) in history regarding Nelson Mandela
*January 11, 2015*

**History**

How Nelson Mandela showed leadership through his actions & events of apartheid
*January 11, 2015*

**History**

Leadership Actions/Events in history regarding to Nelson Mandela
*January 11, 2015*

**Math**

Amelia's soccer team won 3/4 of outgrew its games.The team won 18 games.How many games did the team play? Equation:3/4g=18 ,g is the total number of games. Possible solution: g=18×4/3,g is 24?
*January 9, 2015*

**CAL-Help on dr/dt**

A circular oil slick of uniform thickness is caused by a spill of 1 cubic meter of oil. The thickness of the oil is decreasing at the rate of 0.1 cm/hr as the slick spreads. (Note: 1 cm = 0.01 m.) At what rate is the radius of the slick increasing when the radius is 8 meters...
*December 29, 2014*

**Physics~**

No wait I got it!! thankssss
*December 21, 2014*

**Physics~**

what?
*December 21, 2014*

**Physics~**

The moon's gravity is one-sixth that of the earth. What is the period of a 0.25 m long pendulum on the moon?
*December 21, 2014*

**chemistry**

Household bleach is 5.25% NaOCl. What mass of NaOCl would be found in a .5 kg sample of bleach?
*December 17, 2014*

**math**

Arlene has a piece of cloth that is 7 1/8 yards long. She cuts a piece that is 4 3/4 yards long to make a skirt. How much cloth is left?
*December 16, 2014*

**language arts**

I'm In connections academy too (:
*December 9, 2014*

**Interdependence**

How would a world with less interdependence affect my life. I don't really understand how it would affect me directly. Is it like the things we import, would have to made in the U.S so then it would be more expensive?
*December 7, 2014*

**Involving global - ms.Sue?**

Can you help
*December 6, 2014*

**Involving global exchange**

How a world with less interdependence would affect my life.
*December 6, 2014*

**social studies**

How did the Aryans influence the culture of South Asia? Please help.
*December 3, 2014*

**CALCULUS - PLEASE HELP!**

It is known that homing pigeons tend to avoid flying over the water in the daytime, perhaps because the downdrafts of air over water make flying difficult. Suppose a homing pigeon is released on an island at point C , which is 3 km directly out in the water from a point B ...
*December 2, 2014*

**Chemistry**

26.98 grams of Al and 35.45 grams of Cl2 are reacted according to the equation 2Al + 3Cl2 → 2AlCl3 How many grams of AlCl3 will be formed assuming 100% yield? it says the answer is supposed to be 26.98g but cannot seem to reach that. I just want to know how to get there.
*December 2, 2014*

**integrated math**

A 150 yard pipe is cut to provide drainage for two fiekds. If the length of one piece us 3 yards less than twice the length of the second piece, what are the lengths of the two pieces?
*November 25, 2014*

**physics**

An astronaut (mass of 100 kg, with equipment) is headed back to her space station at a speed of 0.750 m/s but at the wrong angle. To correct her direction, she fires rockets from her backpack at right angles to her motion for a brief time. These directional rockets exert a ...
*November 19, 2014*

**English 10**

hey ms.sue i think the answer is b is im right
*November 18, 2014*

**CAL**

Hmmm you know what, I think this problem is an error. Maybe thats why I could not figure it outt?
*November 16, 2014*

**CAL**

The slope of the tangent line to the graph y= x^3/x -x at the point (1, -2/3) I keep getting undefined as a answer but.. I feel like I might be doing something wrong because I feel like that is not the answer, can you help me please?
*November 16, 2014*

**economics**

Assume a firm is a monopsonist that can hire its first worker for $6 but must increase the wage rate by $3 to attract each successive worker (so that the second worker must be paid $9, the third $12, and so on). The marginal revenue product of labor is given in the table below.
*November 16, 2014*

**Calculus - PLEASE HELP!!**

Ok. Thanks. The answer key said -1 though. So I thought I might have done something wrong.
*November 12, 2014*

**Calculus - PLEASE HELP!!**

Use L'Hospital's Rule to solve: lim u --> 1 of (u-1)^3/ ((1/u) - u^2 + (3/u) - 3) Ok, so what I thought was that it is type 0/0 so taking the derivatives of the top and bottom 3(u-1)^2 /(-u^-2 -2u - 3u^-3) and subbing in u = 1 = 0/-6 = 0
*November 12, 2014*

**Math**

Estimate the product by finding two answers the exact answer is between 7x 3,289
*November 11, 2014*

**science**

If you had 50 atoms of hydrogen, how many atoms each of oxygen, carbon, and nitrogen would you need to have the elements in the same proportion as they are in your body?
*November 10, 2014*

**science**

A certain mass of water gains 1,673 J of thermal energy when it's temperature increases by 2.0 degrees Celsius. What is the mass of the water?
*November 10, 2014*

**science**

How does the temperature of 33.0 g of graphite change when it absorbs 350 J of thermal energy?
*November 10, 2014*

**science**

How much thermal energy is needed to raise the temperature of 4.0 kg of water from 25 degrees Celsius to 75 degrees Celsius?
*November 10, 2014*

**science**

On a hot day a friend suggest that you can make your kitchen cooler by leaving the refrigerator door open. Explain whether leaving the refrigerator door open would cause the air temperature in the kitchen to decrease.
*November 10, 2014*

**science**

Which has the greater amount of thermal energy, one liter of water at 50 degrees Celsius or two liters of water at 50 degrees Celsius?
*November 10, 2014*

**Math - Word problem**

Hi Reiny - I looked at the picture and redrew my walls, but it still doesn't come out for walls that are 10' in each direction. I noticed that the ceiling and floor in the picture had a longer dimension than the side heights, so I took ceiling and floor and extended ...
*November 9, 2014*

**Math - Word problem**

I posted this earlier and received a reply - but the reply doesn't make sense. I drew up a picture of what was posted, but the figure comes out to finding the hypotenuse of a triangle that is 16x14 - not 16x10. What am I not seeing? Original problem: There is a room 10 ...
*November 9, 2014*

**Math -word problem**

I made your configuration with sheets of paper 10" x 10". I got the 16" leg, but I don't get the 10 foot height. I have the walls/ceiling in position similar to a backwards z. But from one foot over to the right from F, if I go straight up to form one of the...
*November 9, 2014*

**Math -word problem**

There is a room 10 feet high by 10 feet wide by 10 feet in length. On one wall, there is an electrical outlet 1 foot from the floor and centered five feet from each side of the wall. On the opposite wall, one foot from the ceiling and centered five feet from each side of the ...
*November 9, 2014*

**Early Childhood Education**

Studies show that early readers: A. watched educational television more than two hours a day. B. had access to a variety of reading material and watched educational television. C. knew all of the letters and sounds by age 2. D. were read fiction and non-fiction books during ...
*November 7, 2014*

**math**

what does rose mean/fell
*November 5, 2014*

**math**

How to find the area of a regular hexagon with a perimeter of 78 inches and a perpendicular distance of 11 inches from side to center
*November 4, 2014*

**Chemistry**

If a calorimeter has a mass of 6.0 g, a specific heat of 2.0 J/(g*C), and it and its contents undergo a temperature increase of 5.5 *C, how much heat is gained by the calorimeter?
*November 1, 2014*

**ratios**

simplify the rate 35 cups to 84 people
*October 31, 2014*

**math**

Karen collects 6/7 quart of rainwater. She uses ½ of the water to clean her bicycle and uses the remaining water equally for 3 houseplants. What volume of water does she use for each houseplant?
*October 30, 2014*

**Chemistry**

A student weights 1.700 g of succinic acid and dissolves it in water in a 250.0 mL volumetric flask. A 25.00 mL sample of this solution is withdrawn and placed in a 125 mL Erlenmeyer flask, to which 5 drops of the acid-base indicator phenolphthalein is added. This solution is ...
*October 26, 2014*

**math**

your recipe calls for 300 grams of chocolate .you have 200 grams .what fraction of chocolate do you have?
*October 26, 2014*

**intermidiate algebra**

Best Rentals charges a daily fee plus a mileage fee for renting its cars. Barney was charged $111.00 for 3 days and 300 miles, while Mary was charged $198.00 for 5 days and 600 miles. What does Best Rentals charge per day and per mile?
*October 25, 2014*

**Maty**

Best Rentals charges a daily fee plus a mileage fee for renting its cars. Barney was charged $111.00 for 3 days and 300 miles, while Mary was charged $198.00 for 5 days and 600 miles. What does Best Rentals charge per day and per mile?
*October 25, 2014*

**science**

Due to friction with the Earth's atmosphere, a large static electric charge could build up on our plummeting asteroid fragment. Would you expect our fragment to generate a magnetic field? Explain why or why not
*October 24, 2014*

**Math**

How do you divide 3/4 by 2/3?
*October 23, 2014*

**Math HELP!**

No, the answer is 14 in.
*October 22, 2014*

**algebra**

3/5-i
*October 19, 2014*

**Help- Calulus**

Yeah, its on my AP Calculus homework actually, in reality its just a small part of a very very long question, I just wanted to make sure I did my work right because the first step is the most important in this problem because if I get part A wrong then I will end up getting ...
*October 17, 2014*

**Help- Calulus**

A. If the focal length of the convex lens is supposed to be 5 cm, and if the image is formed 7 cm from the lens, find the distance, p, from the lens to the object. (It’s not necessary to simplify your answer.) Equation: 1/p + 1/q = 1/f
*October 17, 2014*

**Calculus**

Ohhhhhhhhhhhhhhhhhhhhh, Thanks!
*October 17, 2014*

**Calculus **

Suppose a ball is thrown straight up into the air, and the height of the ball above the ground is given by the function h(t) = 6 + 37t – 16t2, where h is in feet and t is in seconds. At what time t does the ball stop going up and start returning to earth?
*October 17, 2014*

**Calculus **

The population of a colony of bacteria is modeled by the function p(x)=50(e^-x - e^-x^2)+10 ,for 0 ≤ x, where population P is in thousands, x is in hours, and x = 0 corresponds to the moment of introduction of a certain chemical into the colony's environment. At ...
*October 16, 2014*

**Calculus **

The population of a colony of bacteria is modeled by the function p(x)=50(e^-x - e^-x^2)+10 , for 0 ≤ x, where population P is in thousands, x is in hours, and x = 0 corresponds to the moment of introduction of a certain chemical into the colony's environment. At ...
*October 16, 2014*

**Calculus..**

Thanks :)
*October 16, 2014*

**Calculus..**

Two particles are moving in straight lines. The displacement (meters) of particle 1 is given by the function s(t)= cos(4x), where t is in seconds. The displacement (meters) of particle 2 is given by the function s(t)= t^3/3-t^2/2 +2(t) , where t is in seconds. Find the first ...
*October 16, 2014*

**Physics**

I don't know that's why I'm here
*October 15, 2014*

**Chemistry**

Do you expect CaCl(s) to be stable if the 1st ionization energy of Calcium is approx. 590 kj/mol, the Lattice Energy is approx 700 kj/mol and the total change in enthalpy is -36? Why?
*October 14, 2014*

**physics**

Thank you!
*October 8, 2014*

**physics**

In a traction setup for a broken bone, with pulleys and rope available, how might we be able to increase the force along the femur using the same weight?
*October 8, 2014*

**General Psychology **

Which of the following is a stimulant? Alcohol LSD Heroin Mescaline Nicotine
*October 8, 2014*

**physics**

A 35.9 kg child starting from rest slides down a water slide with a vertical height of 20.3 m. (Neglect friction.)What is the child speed half way down
*October 7, 2014*

**College Alg**

The revenue and cost equations for a product are R=x (50-0.002x) and C= 12x+ 150000. Where R and C are measured in dollars and x represents the number of units sold. How many units must be sold to get a profit of at least 1,650,000
*October 1, 2014*

**Fluid Mechanics**

Oil (sp. gr.= 0.8) flows smoothly through the circular reducing section shown at 3 ft^3/s. If the entering and leaving velocity profiles are uniform, estimate the force which must be applied to the reducer to hold it in place. When Fluid is entering the pipe: P= 50 psig ...
*September 30, 2014*

**math**

ann takes a taxi at 2.10 per mile and she gives the driver a 5.00 tip she spend a total of 49.10 write an equation to represent total cost in terms of distance
*September 22, 2014*

**health care administration**

I need to write a weekly overview for my class. I have tried to Google but I keep asking it wrong. Any ideas on how to see an example of a overview of the class? Thank you Mary
*September 19, 2014*

**physical science**

Two 3.4 kg physical science textbooks on a bookshelf are 0.25 m apart. What is the magnitude of the gravitational attraction between the books?
*September 19, 2014*

**math**

Estimate 540943 + 382093= 923036
*September 19, 2014*

**math 4th grade**

Find two numbers the exact answer is between 3x567
*September 18, 2014*

**Physics**

Eileen, Jackie, and Kathryn needed to find the difference between two angles A1 and A2, that they had drawn on a diagram: B = A1+A2 They then had to find the cosine of B. Jackie measured A1 to be 50° and A2 to be 3°. But their pencil was kind of dull, so the lines they...
*September 17, 2014*

**algebra**

the water ina beaker has of18g electeicity is passed thought the water for two hours afterward the water has a mass of only 16g what happen to the missing mass?
*September 17, 2014*

**health care administration**

I need some advice on what are some health care products. The only thing I come up with is Q-tips and liquid bandage. Any ideas? The assignment is how the four P's influences the success of the product. I know how to do this.
*September 16, 2014*

**Chemistry please help**

thank you so much, yes the site is helpful
*September 11, 2014*

**Chemistry please help **

Complete each calculation. Express your answer to the correct number of significant digits. a)4.02mL + 3.76mL +0.95mL b)(2.7 x 10^2m) x (4.23 x 10^2m) c)5092kg divided by 23L d) 2-6.3 + 6-7 e)(6.853 x 10^3L) + (5.40 x 10^3mL) f)(572.3g + 794.1g) divided (24mL + 52mL) My ...
*September 11, 2014*

**Physics**

Two cars, A and B, travel in a straight line. The distance of A from the starting point is given as a function of time by xA(t)=αt+βt^2, with α=2.60m/s and β=1.20m/s^2. The distance of B from the starting point is xB(t)=γt^2−δt^3, with γ...
*September 7, 2014*

**stats**

what are the mean and standard error when using central limit theorem for dichotomous variable
*August 28, 2014*

**Math**

Suppose that y varies inversely as t he cube of x. If y is 1/2 when x is 2 , find the constant of variation and variation equation
*August 28, 2014*

**Th**

the area of a regular polygon varies jointly as its apothem and its perimeter. express the area in terms pf apothem a and the perimeter p
*August 28, 2014*

**math**

I have a nickel. dime and a quarter, the dime is in the middle, how do I move the dime from center wihtout touching it. I would simply slide the nickel to the back
*August 26, 2014*

**math**

I agree
*August 26, 2014*

**math**

The cost for class trip is $5 per student plus$100 for the bus. Input(x) rule output(x) 18 22 24 30
*August 26, 2014*

**math**

How many possible license plates can be made with 4 letters followed by 4 numbers and must start with the letter C
*August 26, 2014*

**business**

Wallace Inc., a developer of radiology equipment, has stock outstanding as follows: 30,000 shares of cumulative preferred 2% stock, $90 par and 125,000 shares of $10 par common. During its first four years of operations, the following amounts were distributed as dividends: ...
*August 25, 2014*

**math**

50 in 100 and 30 in 90
*August 18, 2014*

**psychology**

1 what does peter singer say about history liberation movements? 2 The philosopher,John Stuart mill recognized the follow as a potential problem for utilitarianism what is peter point about performing vivisection on mentally health disabled human infants?
*August 16, 2014*

**Math**

Adrienne had a party at a local bowling alley. She spent seventy-five dollars for the lane and five dollars per person for shoes. Let c be the total cost of the lane and shoes, and let f be the number of friends at her party. Write an equation to represent the problem. Which ...
*August 12, 2014*

**math**

For the car loan described, give the following information. A newspaper advertisement offers a $4,500 used car for nothing down and 36 easy monthly payments of $157.62. (a) amount to be paid
*August 5, 2014*

**Public Health**

The assignment What is a public health agency that affects your workplace or your health care provider. My question: Where can I find some names to do my work? I know about the FDA and CDC and the Department of disabilities. Thank You Mary
*August 1, 2014*

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