Sunday

December 21, 2014

December 21, 2014

Total # Posts: 199

**chemistry**

a balloon is filled with 15 L of an ideal gas of 20C. at this temperature the pressure of the gas is 1520 mm Hg. Suppose that the volume of the gas is reduced to 5 L at 290 K. what is the new pressure of the gas in atmospheres?
*December 4, 2014*

**physics**

The system in the Figure is in equilibrium. A mass M1 = 226.0 kg hangs from the end of a uniform strut which is held at an angle è = 41.0° with respect to the horizontal. The cable supporting the strut is at angle á = 27.4° with respect to the horizontal...
*October 14, 2014*

**Physics**

You are the juror of a case involving a drunken driver whose 972 kg sports car ran into a stationary 2094 kg station wagon stopped at a red traffic light. The cars stuck together and slid with locked wheels for 11.0 m before coming to rest. The coefficient of sliding friction ...
*October 7, 2014*

**statistics**

I need help to understand formula
*July 27, 2014*

**statistics**

A student of the author surveyed her friends and found that among 20 males, 4 smoke and among 30 female friends, 6 smoke. Give two reasons why these results should not be used for a hypothesis test of the claim that the proportions of male smokers and female smokers are equal...
*July 27, 2014*

**Sociology **

In the U.S., which social class has benefitted the most from the tax breaks?
*July 19, 2014*

**Bio**

A biologist measured the amount of DNA in several single diploid cells taken from a culture. He knew that these cells could divide mitotically, but not meiotically. His data is shown below: Cell Number and DNA content in micrograms: Cell 1 (11.1 micrograms) Cell 2 (5.4 ...
*March 6, 2014*

**culturally diverse**

D - In many Native American cultures, language occurs primarily within the context of work and learning important crafts.
*December 29, 2013*

**culturally diverse**

Young children's functional use of language within a work context is often observed in... a. mainstream industrialized societies b. triadic interactions in Mexico-American group c. rural Appalachian Black communities d, Native American cultures
*December 29, 2013*

**math**

Fantasia Florist Shop purchases an order of imported roses with a list price of $2,375 less trade discounts of 15/20/20. What is the dollar amount of the trade discount? (Points : 2.5)
*November 27, 2013*

**math**

What is the force exerted by a catcher's glove on a 0.15-kg baseball moving at 35 m/s that is stopped in 0.02 s?
*November 11, 2013*

**math**

What is the force exerted by a catcher's glove on a 0.15-kg baseball moving at 35 m/s that is stopped in 0.02 s?
*November 11, 2013*

**Physics**

A man is pulling on a rope with a force of 86 N directed at an angle of 64◦ to the horizontal. What is the x-component of this force? Answer in units of N What is the y-component of this force? Answer in units of N
*November 2, 2013*

**Physics**

Sue and Jenny kick a soccer ball at exactly the same time. Sue’s foot exerts a force of 49.9 N to the north. Jenny’s foot exerts a force of 119.7 N to the east. a) What is the magnitude of the resultant force on the ball? Answer in units of N b) What is the direction...
*November 2, 2013*

**ALGEBRA HELP**

bobpursely can u help me with a question?
*October 21, 2013*

**algebra 2**

thank you so much Reiny your a life saver ;)
*October 21, 2013*

**algebra 2 help **

can you please help me with this
*October 21, 2013*

**algebra 2**

how do i work it out i dont know how to do it though
*October 21, 2013*

**algebra 2**

simplify the expression -5+i/2i
*October 21, 2013*

**ece**

A preschool child can be designated a reader when he or she: a. writes words b. sounds out a word and is almost correct c. has both phonemic and phonological awareness d. understands and/or acts appropriately when looking at a written word
*October 14, 2013*

**Literature**

ok, thx for the help
*May 31, 2013*

**Chemistry**

Do you think this answer is correct? The nucleus subatomic structure is held together by a strong force. While, it holds three quarks together to make a nucleon it also holds the nucleons together which forms the nucleus. A nucleon could be either a proton or neutron. The ...
*May 31, 2013*

**Science**

What does this word spell in plate tectonics rorpsfgnloadeeasi
*February 1, 2013*

**math**

To find the perimeter, you just have add the length+width+length+width. In this case, the answer will be: 1 250m 80 80 45 + 45 ________ 250
*December 18, 2012*

**physics**

why and how does the blowing snow charge the fences?
*November 8, 2012*

**math**

how do I use multiplication and the Distributive property to find the quotient of 108/6
*October 9, 2012*

**math**

dave delivered 52 newspapers in all.saturday and sunday.he delivered 8 more newspapers on sunday than on saturday.how many newspapers did dave deliver on sunday.
*August 30, 2012*

**Mathhhhhhhhh**

1.Describe the effects on the graphs y = sin k0(0 is theta) and y = cos k(0 is theta) as the value of k vaires.
*May 2, 2012*

**6th grade history**

thank you.really appreciate it :D
*March 29, 2012*

**6th grade history**

how did athens become rich?
*March 29, 2012*

**math**

The equation y = 400(1.03)x is an example of
*March 1, 2012*

**math**

In a particular small town, the population in 1995 was 1200. Ever since then the population has grown by 4% every year. If conditions stay the same, what is the approximate expected population in the year 2000?
*March 1, 2012*

**math**

Rewrite using only positive exponents: x−5y3 how do you rewrite without negative exponents?
*March 1, 2012*

**chemistry**

I need help in learning to find the correct information. I tend to spend hours and I still get frustrated. Maybe some helpful websites. Thank you
*January 22, 2012*

**chemistry**

Week 5, Day 4, respond to the problem statement assigned to you for this week. At a prominent state hospital, a 45-year-old woman is receiving a ‘combined modality' treatment for the initial stage of breast cancer. State the two aspects included in this treatment. ...
*January 22, 2012*

**algebra**

Rewrite with positive exponents. Assume that even roots are of nonnegative quantities and that all denominators are nonzero. (2x^2y-^1)^-6
*December 20, 2011*

**english**

Corrections: Cancer is known as the unbiased killer; it does not discriminate in the race, age, or sex of it victims. Lung cancer is the number one cause of cancer deaths for United States men and women. Lung Cancer takes millions of lives each year, sometimes without the ...
*December 17, 2011*

**statistics**

From the Arizona Department of Weights and Measures: Among 31 inspections sat a NAPA Auto Parts store, 88% failed. X= ?
*December 4, 2011*

**physics**

A six kilogram object undergoes an acceleration of 2.0 meters per second squared. Part a. What is magnitude of the net force acting on the object? Part B. If the same force is applied to a 4 kilogram object what acceleration is produced?
*October 19, 2011*

**Calc**

If a rock is thrown upward on the planet Mars with a velocity of 17 m/s, its height (in meters) after t seconds is given by H = 17t − 1.86t^2. (a) Find the velocity of the rock after one second. (b) Find the velocity of the rock when t = a. (c) When will the rock hit the...
*October 17, 2011*

**math**

(7+9)+3= 1+(9+5)=
*October 6, 2011*

**Math**

Find the cost function if the marginal cost function is dC/dx=2x-15 and fixed costs are $75.
*August 26, 2011*

**Calculus**

Find all points at which the graph of f (x) = x^3 −3x has horizontal tangent lines.
*August 23, 2011*

**Chemistry**

I need help writting a formula for: AgNO3(l) + PbNO3(l) + HgNO3(l) + HCl (l)
*July 5, 2011*

**Chemistry**

A liquid hydrocarbon (Cx Hy) is found to be 16.37% H by mass. A 1.158-g vaporized sample of the hydrocarbon has a 358 mL volume at 71.0 C and 749 mmHg. what is the molecular formula for this hydrocarbon?
*June 21, 2011*

**Chemistry**

3. A liquid hydrocarbon (Cx Hy) is found to be 16.37% H by mass. A 1.158-g vaporized sample of the hydrocarbon has a 358 mL volume at 71.0 C and 749 mmHg. what is the molecular formula for this hydrocarbon? 4. A 1.00 g Sample of C7H603 (s), us completely burned in a bomb ...
*June 21, 2011*

**precalculus**

Find an angle between o and 2pi that is coterminal with the given angle -8pi/3: 71pi/2: 11pi/7:
*May 4, 2011*

**precalculus**

Write and simplify the difference quotient for the function b(t)= 3t^2-4t+5 over the interval [7,7+h]
*April 13, 2011*

**Calculus (pleas help I really need to check this)**

Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...
*April 11, 2011*

**Calculus (please help I really need to check this)**

Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...
*April 11, 2011*

**science**

The resulting solution is saturated because 86 is what equals both of the grams of salt added to the water at degrees C. 15 g + 50 g = 86 grams
*April 11, 2011*

**Calculus (pleas help I really need help with this)**

The cross-sectional area is jus the rectangle...
*April 10, 2011*

**Calculus (pleas help I really need help with this)**

I tried that... it's not it... apparently there must be something wrong with the arythmetic but I can't find what it is...
*April 10, 2011*

**Calculus (pleas help I really need help with this)**

Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...
*April 10, 2011*

**Calculus (please help!!!!)**

Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...
*April 10, 2011*

**Calculus (please help!!!)**

Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...
*April 10, 2011*

**Calculus**

Hi, I wasn't posting under different names, I have just used my name and I was just posting the explanation I received from other tutor, I didn't understand some of it so I posted it again because right now it must be on page 5 or something like that... I'm not ...
*April 10, 2011*

**Calculus**

In a chemical reaction, substance A combines with substance B to form subtance Y. At the start of the reaction, the quantity of A present is a grams, and the quantity of B present is b grams. Assume a is less than b. At time t seconds after the start of the reaction, the ...
*April 10, 2011*

**Calculus please help!!**

Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...
*April 10, 2011*

**Calculus**

In a chemical reaction, substance A combines with substance B to form subtance Y. At the start of the reaction, the quantity of A present is a grams, and the quantity of B present is b grams. Assume a is less than b. At time t seconds after the start of the reaction, the ...
*April 10, 2011*

**Calculus (please help!!!)**

Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...
*April 10, 2011*

**Calculus**

In a chemical reaction, substance A combines with substance B to form subtance Y. At the start of the reaction, the quantity of A present is a grams, and the quantity of B present is b grams. Assume a is less than b. At time t seconds after the start of the reaction, the ...
*April 10, 2011*

**Calculus**

HI, Thanks for the explanation, that makes a lot of sense, I don't know why it didn't occur to me that mass can't be negative... but I typed those answers and I still get them both wrong... I don't know why...
*April 10, 2011*

**Calculus**

In a chemical reaction, substance A combines with substance B to form subtance Y. At the start of the reaction, the quantity of A present is a grams, and the quantity of B present is b grams. Assume a is less than b. At time t seconds after the start of the reaction, the ...
*April 10, 2011*

**precalculus**

For the Function, y= x(x-4)(x+8) Y-intercept is: X-intercept is:
*April 4, 2011*

**Chemistry**

Calculate the pH after 0.13 mol of NaOH is added to 1.00 L of the solution that is 0.57 M HF and 1.13 M KF. I got the answer of 3.66 to 3 sig figs, but it's wrong. Can you please tell me what I did wrong? -Thanks
*March 27, 2011*

**precalculus**

Twenty percent of a radioactive substance decays in ten years. By what percent does the substance decay each year?
*March 3, 2011*

**precalculas**

The doubling period of a baterial population is 20 minutes. At time t=100 minutes, the baterial population was 80000. What was the initial population at time t=0? Find the size of the baterial population after 4 hours.
*March 1, 2011*

**precalculas**

the amount of bacteria in a petri dish increased by a percent change of 12% each hour over a period of 15 hours. a. find the growth factor for 1 hour? b. by what total percent did the bacteria change during this 15- hour time period.? c. how long will it take for the bacteria ...
*March 1, 2011*

**precalculas**

Given the function f(x)= 4+4x^2, calculate the following values: [f(a+h)-f(a)]/h
*February 26, 2011*

**precalculas**

i tried like 7 times stil getting it wrong.
*February 25, 2011*

**precalculas**

Let f(x) be the function 8x^2-5x+2 . Then the quotient [f(5+h)-(5)]/h can be simplified to ah+b for: a= b=
*February 25, 2011*

**precalculas**

Let f(x) be the function 1/[x+12] . Then the quotient [f(4+h)-f(4)]/h can be simplified to for: -1/[ah+b] a= b=
*February 25, 2011*

**Chemistry**

I did those steps and got .869 for CH2Cl2 and .130 CH2Br2 (assuming that both is in the correct number of sigfigs), but they don't seem to be right. I just want to know what I am doing wrong, or is this also the answer you got.
*February 20, 2011*

**Chemistry**

A solution is prepared by mixing 0.0400 mol CH2Cl2 and 0.0700 mol of CH2Br2 at 25°C. Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25°C. At 25°C, the vapor pressures of pure CH2Cl2 and pure CH2Br2 are 133 and...
*February 20, 2011*

**precalculas**

f(x)=2-9x find f^-1(6)
*February 13, 2011*

**Chemistry**

A 13.0-g sample of ice at -13.0°C is mixed with 112.0 g of water at 80.0°C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capacities of H2O(s) and H2O(l) are 2.08 and 4.18 J/g · °C, respectively, and the ...
*February 13, 2011*

**math**

f(x)=2-9x find f^-1(6)
*February 11, 2011*

**psychology**

you are conducting research on sex differencesin emails .Your hypothesis is that the men use more declarative statements and women use more questions.what might be the advantages of using the archival method
*February 4, 2011*

**math**

Plot the points A(2,2), B(4,6),C(10,-2)Notice that these points are vertices of a right triangle (the angle is 90 degrees). Find the area of the triangle ABC:
*February 3, 2011*

**math**

Find the point (o,b) on the y-axis on the y-axis that is equidistant from the points (1,1) and (2,-1)
*February 3, 2011*

**calculus**

suppose the endpoints of one side of a rotated square are (-5,-5) and (1,-1). Find the dimensions and area of the square
*February 3, 2011*

**personal planning**

what types of diseases can you get if you are unhealthy?
*January 26, 2011*

**humanistic theory**

People often make career changes in their lives. How would the humanistic theory of behavior explain this phenomenon?
*December 3, 2010*

**math**

He becomes an electrician
*November 30, 2010*

**poetry**

What is the meaning of the phrase "steal the secret of the sun"
*November 15, 2010*

**math**

If 3 men who are yhe same in size need to drink 12 glasses of milk in a certain time, how many glasses of milk will 7 men who are the same size as them need in the same time frame they needed 12 glasses?
*November 11, 2010*

**math**

Estimate to the nearest 100 if you have: a) 56 293 b) 6 521 308
*November 11, 2010*

**math**

a) how many tens are in 1000? b) how many hundreds are in 6000? c) how many thousands are in 2 000 000?
*November 11, 2010*

**Science**

Human caused chemical changes would be I think greenhouse gases,and water pollution.
*November 10, 2010*

**Bassick High School**

this is the work on how to do it Vf = Vi+at Vf = 1.3+0.09*10 = 2.2 m/s b. jogging
*September 7, 2010*

**Bassick High School**

the speed after 10.0s is 2.2 m/s she is jogging
*September 7, 2010*

**Algebra**

Solve the system by either elimation or substitution: x+8y=18 y=-2/7x-18/7
*August 2, 2010*

**math**

1/2a-5=1/3a-1 please show me how to set this problem up and solve it
*July 19, 2010*

**macroeconomics**

Cyclical unemployment arises in part from a desire by workers to move from low-paying,low-productivity jobs to higher-paying, higher productivity jobs.
*June 9, 2010*

**college:Macroeconomics**

Which of the following is not economic investment? (a). The purchase of 100 shares of AT&T by a retired business executive. (b). The purchase of a drill press by the Ajax Manufacturing company. (c). Construction of a suburban housing project. (d). The piling up of inventories ...
*June 5, 2010*

**college: ECON**

Are you still looking for the answer.
*June 5, 2010*

**college: ECON**

The answer is true or false.
*June 5, 2010*

**Math**

A hat contains 20 names, 9 of which are females. If 8 names are randomly drawn from the hat, what is the probability that at least 6 male names are drawn??????
*June 1, 2010*

**french**

im begging you! somebody pleaaaaaase help me on this! i have about 5 hours before its due!!
*May 26, 2010*