Sunday

August 30, 2015
Total # Posts: 1,227

**college chemistry**

Calcium oxide (CaO), an important ingredient in cement, is produced by decomposing calcium carbonate (CaCO3) at high temperature: CaCO3(s) → CaO(s) + CO2(g) In one particular reaction, 40 g of CaCO3 is heated at 750°C in a 5.0 L vessel. The pressure of CO2 is 0.12 ...
*February 8, 2011*

**chemistry**

Internal energy = heat + work heat = -196 kJ work = 4200 kJ Internal energy = -196 kJ + 4200 kJ
*February 8, 2011*

**Math**

Is (0,2) a orderd pair a solution of 4x - 3y = 6? Explain.
*February 7, 2011*

**science**

ethanol, C2H5OH, is responsible for the effts of intoxication felt after drinking alcoholic beverages. When ethanol burns in oxygen, carbon dioxide and water are produced. IF you have 256g of ethanol and 100 grams O2, calculate the amount product produced. You need to write ...
*February 6, 2011*

**Chemistry**

Aluminum has a density of 2.99 grams per cubic cm. and a specific heat of 0.22 calories per gram degree Celsius. A cube of aluminum is sitting out in the sun where it absorbs 16.2 calories of heat and warms from 62*F to 149*F How many inches wide are the sides of the cube?
*February 2, 2011*

**Chemistry**

Aluminum has a density of 2.99 grams per cubic cm. and a specific heat of 0.22 calories per gram degree Celsius. A cube of aluminum is sitting out in the sun where it absorbs 16.2 calories of heat and warms from 62*F to 149*F How many inches wide are the sides of the cube?
*February 2, 2011*

**History**

I'm not sure about general but I think welfare is the state of doing well in like happiness and good fourtune
*January 31, 2011*

**History**

What is general welfare?
*January 31, 2011*

**History**

Descirbe "To provide common defense"
*January 31, 2011*

**math**

Minimize c = x + y subject to x + 5y ≥ 6 5x + y ≥ 6 x ≥ 0, y ≥ 0.
*January 29, 2011*

**math**

Maximize and minimize p = x + 2y subject to x + y ≥ 8 x + y ≤ 10 x − y ≤ 8 x − y ≥ −8. Minimum: p = 1 x = 2 y = 3 Maximum: p = 4 x = 5 y = 6
*January 28, 2011*

**math**

You are thinking of making your mansion more energy efficient by replacing some of the light bulbs with compact fluorescent bulbs, and insulating part or all of your exterior walls. Each compact fluorescent light bulb costs $4 and saves you an average of $2 per year in energy ...
*January 28, 2011*

**MATH**

noo
*January 28, 2011*

**MATH**

I had these as the equations but how do u set them up to find how many of each to maximise profit
*January 28, 2011*

**MATH**

The Megabuck Hospital Corp. is to build a state-subsidized nursing home catering to homeless patients as well as high-income patients. State regulations require that every subsidized nursing home must house a minimum of 770 homeless patients and no more than 900 high-income ...
*January 28, 2011*

**History**

What are two executive powers of the president of the united states?
*January 25, 2011*

**geometry**

find all points of form (x,-1) 4 units from point (3,2)
*January 23, 2011*

**computers**

these are the synonyms for spiral : circling, circular, circumvoluted, cochlear, coiled, corkscrew, curled, helical, helicoid, radial, rolled, screw-shaped, scrolled, tendrillar, tortile, voluted, whorled, wound
*January 19, 2011*

**computers**

any other websites, Ms Sue?
*January 19, 2011*

**computers**

What are the best websites to find facts on inventions such as the spiral notebook?
*January 19, 2011*

**histoy**

i don't have a hole punch but thanks for your help.
*January 19, 2011*

**histoy**

what about shoelace?
*January 19, 2011*

**histoy**

it's just that i don't have much at home.The ribbon,well,let's just say I've never seen one in my life and I can't find my pipe cleaners!What do I do?! :(
*January 19, 2011*

**histoy**

what other material could i use? I'm sorry to keep bothering you but i have a report on this due TOMORROW!!!
*January 19, 2011*

**histoy**

what about pipe cleaners? I want to be creative.also, I don't have metal.
*January 19, 2011*

**histoy**

how would you make a spiral notebook with yarn,paper, and a pre-hole punched folder?
*January 19, 2011*

**histoy**

What are some interesting facts on the spiral notebook?
*January 19, 2011*

**history**

But when was the spiral notebook made?
*January 19, 2011*

**Eng Literature**

Describe the Genre between Hamlet and Midsummer Night's Dream
*January 18, 2011*

**math**

52,39 56,42 60,45 64,48
*January 13, 2011*

**history**

W. Walter Grumbacher invented it, apperently
*January 13, 2011*

**history**

Who made the spiral notebook and when?
*January 13, 2011*

**math**

I am a five-digit whole number.My digits decrease by 2 from the ten-thousands place to the ones place. Each of my digits is an even number.What number am i ?
*January 12, 2011*

**science**

what is hubble telescope, moon, saturn, sun, pleiades stars, whirlpool deep field in order to smallest to largest?
*January 12, 2011*

**Calculus **

Find dy/dx y = (x+y)/(x√2) I know that you can simplify the problem by arranging it to: y = (x)/(x√2) + (y)/(x√2) but I don't know where to go from here
*December 28, 2010*

**Medical Information management and office practice**

In what type of hmo doe the physician treat only hmo subscribers? a. group medical b. independent practice c. staff model d. Preferred provider organization
*December 21, 2010*

**Chem**

So I found the Ka for HPO4^2- which is 2.2x10^-13 Then i found HPO42- on right side of the table and found the ka value which is 6.2x10^-8. Then, I used kb=kw/ka to and got 1.61x10^-7 Since kb>ka the reaction: HPO4^2- + H2O <--> H2PO4- + OH- would be the one most ...
*December 15, 2010*

**Chem**

I don't really understand what k2 and k3 means.. To find the predominant reaction, could I compare the ka and kb values for HPO4^2-?
*December 15, 2010*

**Chem**

I answered that, but the teacher marked me wrong.. so I don't understand why? The predominant reaction should be HPO4^2- acting as an acid right?
*December 15, 2010*

**Chem**

What is the equilibrium constant expression for the predominant equilibrium in HPO4^2- (aq)?
*December 15, 2010*

**Chem**

Nevermind, I think I understand it now. Thanks.
*December 15, 2010*

**Chem**

c) Ca (s) reacts and produces Co2(g) Can you explain to me why it's b please?
*December 15, 2010*

**Chem**

which of the following occurs when a sample of 0.1M HNO3 is tested? a) phenolphthalein turns pink b) bromthymol blue turns yellow c) Ca9s) reacts and produces CO2 (g) d) Na (s) reacts and rpoduces NO2 (g)
*December 15, 2010*

**12th Grade Calculus **

Find d^2y/dx^2 by implicit differentiation. x^(1/3) + y^(1/3) = 4 I know that first you must find the 1st derivative & for y prime I got 1/3x^(-2/3) + 1/3y^(-2/3) dy/dx = 0 Then for dy/dx I got dy/dx = [-1/3x^(-2/3)] / [1/3y^(-2/3)] I think that from here I would use the ...
*December 14, 2010*

**english**

The high rate of eating disorders in the United States is mainly attributed to social factors such as media, cultural influences, and family factors. My questions is should it be, The high rate of eating disorders in the United States IS/ARE mainly attributed?
*December 10, 2010*

**math**

Suppose two dice (one red, one green) are rolled. Consider the following events. A: the red die shows 5. B: the numbers add to 4. C: at least one of the numbers is 3. D: the numbers do not add to 10. Express the event "The numbers do not add to 4." in symbols. 1 B D ...
*December 5, 2010*

**Probability**

f two indistinguishable dice are rolled, what is the probability of the event {(3, 3), (2, 3), (5, 3)}? 1 What is the corresponding event for a pair of distinguishable dice? 2 {(3, 3), (2, 3), (5, 3)} {(3, 3), (2, 3), (5, 3), (3, 5), (3, 2)} {(3, 3), (2, 2), (5, 5), (3, 5), (3...
*December 5, 2010*

**math probabilty**

Find the (theoretical) probability of the given event, assuming that the coins are distinguishable and fair, and that what is observed are the faces uppermost. Six coins are tossed; the result is at most one head.
*December 5, 2010*

**math**

Complete the following probability distribution table and then calculate the stated probabilities. Outcome a b c d e Probability 0.1 1Your answer is correct. 0.43 0.1 0.27 (a) P({a, c, e}). 2Your answer is correct. (b) P(E ∪ F), where E = {a, c, e} and F = {b, c, e}, P(E...
*December 4, 2010*

**Math Probability**

Find the (theoretical) probability of a given event, assuming that the dice are distinguishable and fair, and that what is observed are numbers uppermost. Two dice are rolled; the numbers add to 7. 1
*December 3, 2010*

**chemistry**

A 1-L flask is filled with 1.45 g of argon at 25 degrees C. A sample of ethane vapor is added to the same flask until the total pressure is 1.35 atm. What is the partial pressure of argon in the flask?
*December 2, 2010*

**math**

3y=4/5
*November 29, 2010*

**english**

which of the following genres is defined by form rather than theme: tragedy, sonnet, comedy, satire, or drama.
*November 23, 2010*

**geometry**

what is the answer to this; Alvan said that if 2 triangles are not congruent, then at least one of the 3 sides of one triangle is not congruent to the corresponding side of the other triangle. do you agree with alvan? justify your answer.
*November 21, 2010*

**PSY/202**

The issue that discusses whether development is more a function of biology or more a function of the environment is the ______________ controversy.
*November 14, 2010*

**chemistry**

I'm thinking Gd (element 64).
*November 9, 2010*

**math**

A poker hand consists of five cards from a standard deck of 52. Find the number of different poker hands of three of a kind (three of one denomination, one of another denomination, and one of a third). 1
*November 7, 2010*

**math**

A bag contains 3 red marbles, 2 green ones, 1 lavender one, 2 yellows, and 4 orange marbles. How many sets of four marbles include all the red ones? 1Your answer is incorrect.
*November 7, 2010*

**english**

help me find subjects and verbs in college sentences
*November 6, 2010*

**chemistry**

Find velocity of electron emitted by metal whose threshold frequency is 2.1*10^14 and when exposed to visible light wavelength of 5.09*10^-7
*November 3, 2010*

**physics**

Funny, I just got to this problem in my physics homework. Use the Conservation of angular momentum idea, L=Iw. You can find this with your given initial values. Then, you use that L in a new equation, except with the I final and w final (which you want to ultimately find). Use...
*October 29, 2010*

**math**

Alohaaaaaa
*October 27, 2010*

**bus math**

Meg's pension plan is an annuity with a guaranteed return of 7% interest per year (compounded monthly). She would like to retire with a pension of $20000 per month for 20 years. If she works 28 years before retiring, how much money must she and her employer deposit per ...
*October 27, 2010*

**bus math**

Determine the selling price of a 15-year, 4.725% bond, with $1000 maturity value, with a yield of 4.735%. (Assume twice-yearly interest payments. Round your answer to the nearest cent.)
*October 27, 2010*

**psy**

Cathy owes six overdue movies to her local video store. Since each of Cathy’s overdue videos is a comedy, only comedies are currently overdue at Cathy’s local video store. Which one of the following premises, if added to the statements above, would allow the ...
*October 25, 2010*

**physics**

where does the 4.9 come from?
*October 24, 2010*

**Math Approximation fractions**

I really don't understand how to determine which number is greater and which one is smaller can anyone help auorlda ?
*October 23, 2010*

**PHYSICS ---HELP!**

A laser beam is directed at the Moon, 380,000 km from Earth. The beam diverges at an angle of 6.2×10−5 rad. What diameter spot will it make on the Moon? Express your answer using two significant figures.
*October 18, 2010*

**math**

Urban Community College is planning to offer courses in Finite Math, Applied Calculus, and Computer Methods. Each section of Finite Math has 40 students and earns the college $40,000 in revenue. Each section of Applied Calculus has 40 students and earns the college $60,000, ...
*October 16, 2010*

**math**

Find the intersection of the line through (0, 1) and (4.4, 2) and the line through (1.9, 3) and (5.3, 0). (Round your answers to the nearest tenth.) (x, y) =
*October 16, 2010*

**math**

You operate a gaming Web site, where users must pay a small fee to log on. When you charged $4 the demand was 510 log-ons per month. When you lowered the price to $3.50, the demand increased to 765 log-ons per month. (a) Construct a linear demand function for your web site and...
*October 16, 2010*

**physics**

A horizontal force of 20 N acted on a 10 kg mass at rest. The force accelerated the mass over a rough surface so that the mass had a speed of 6.0 m/s after 5.0 seconds. How much friction was acting on the mass?
*October 15, 2010*

**precalculus**

Find the dimensions of a square cardboard box (open top) that holds 100 cubic inches and is 4 inches deep?
*October 14, 2010*

**college pre-calc**

how do you know if there are holes in a rational function?
*October 13, 2010*

**Physics Help!!**

Three identical masses of 500 kg each are placed on the x axis. One mass is at x_1 = -11.0 cm, one is at the origin, and one is at x_2 = 37.0 cm. What is the magnitude of the net gravitational force F_grav on the mass at the origin due to the other two masses? Take the ...
*October 11, 2010*

**physics**

a patrol of timing paths each vehicle needs to travel the first half of the distance at a speed of 140 km / h. if the speed limit is 80km / h. which should be the highest average speed of the car in the second half of the section, to avoid being fined?
*October 10, 2010*

**physics**

a car crosses the street ABC. the segment AB = average speed of 60km / h for 2 hours, the length BC = average speed of 90km / h for 1 h. the average speed of car travel in AC is? the route is a straight line
*October 10, 2010*

**business math**

How long, to the nearest year, will it take an investment to triple if it is continuously compounded at 16% per year?
*October 9, 2010*

**math**

After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 2 hours.
*October 9, 2010*

**math**

A bacteria culture starts with 1,000 bacteria and doubles in size every 2 hours. Find an exponential model for the size of the culture as a function of time t in hours. f(t) = 1
*October 9, 2010*

**Physics Help!!**

Suppose the kinetic energy of an object moving is 15 J and the potential energy is 25 J at some point in time. Then I measure the potential energy some time later and find it to be 10 J. What is the new kinetic energy?
*October 8, 2010*

**chemistry**

I think I'm doing the same lab as you. So what I did was find the new concentration of nitric acid in the solution (because by adding it to water, you've just diluted ur concentration). I got .167. Since nitric acid is a strong acid, it dissociates completely, right? ...
*October 8, 2010*

**college**

f(x) = 4 e**(5 x); f(x)=A b**x
*October 8, 2010*

**math**

After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 2 hours.
*October 8, 2010*

**math**

After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 2 hours.
*October 7, 2010*

**math**

if AX= kX k belongs to real numbers A=|4 -2| X=|x| |-2 4| |y| and x is not equal to cero, and cero is not equal to y, find k
*October 7, 2010*

**physics**

if AX = kX, k belongs to reals where A=|4 -2| <-(is a matrix) X=|x|<-(matrix) |-2 4| |y| and x is not equal to cero, cero is not equal to y, find k
*October 7, 2010*

**math**

Use exponential regression to model the price P(t) as a function of time t since 1994. Include a sketch of the points and the regression curve. (Round the coefficients to 3 decimal places.)
*October 7, 2010*

**math**

After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 2 hours.
*October 7, 2010*

**physics**

for example of the stone dropped from a ballon and striking the ground and taking into account air resistance sketch a) a distance-time graph b) a velocity-time graph c)an acceleration-time graph
*October 7, 2010*

**math**

Find equations for exponential functions that pass through the given pair of points. (Round all coefficients to 4 decimal places if necessary.) (-2, 3) and (3, 4)
*October 7, 2010*

**math**

After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 2 hours.
*October 7, 2010*

**math**

A bacteria culture starts with 1,000 bacteria and doubles in size every 2 hours. Find an exponential model for the size of the culture as a function of time t in hours.
*October 7, 2010*

**math**

Obtain exponential functions in the form f(t) = Aert, if f(t) is the value after t years of a $9,000 investment depreciating continuously at an annual rate of 8.5%. f(t) = 1
*October 7, 2010*

**physics! center of mass**

a long non uniform board of length 8 m and mass m = 12 kg is suspended by two ropes if the tensions in the ropes are mg/3 (on left) and 2mg/3 (on right) what is the location of the board's center of mass thank you!
*October 7, 2010*

**physics! center of mass**

a long non uniform board of length 8 m and mass m = 12 kg is suspended by two ropes if the tensions in the ropes are mg/3 (on left) and 2mg/3 (on right) what is the location of the board's center of mass thank you!
*October 7, 2010*

**langauge arts**

PASSAGE: How did one village bring disaster on itself? On a morning in early spring, 1873, the people of Oberfest left their houses and took refuge in the town hall. No one knows why precisely. A number of rumors had raced through the town during recent weeks, were passed on ...
*October 4, 2010*

**chemistry(FSU)**

3 is right! Thank you!! But how'd you get the answer?
*October 2, 2010*

**Math**

Im still confused. Wouldnt each side just be 0.33 m then?
*September 20, 2010*

**Math**

How would i determine that with only one value?
*September 20, 2010*