Saturday
June 25, 2016

Posts by Student

Total # Posts: 799

Algebra
Find K given y=200 when x=300
June 13, 2016

Algebra
Write the equation of the line in slope intercept form; passing through (3,11) with slope 7/3
June 9, 2016

Algebra
A is the point (4,-3) and b is (-1,1). Find the gradient of a line perpendicular to AB. Plz help!!!!
May 24, 2016

Algebra
Thank you John
May 24, 2016

Algebra
Write the gradient of the line perpendicular to the line with gradient. (a) 5 , (b) 7 , (c) -4 , (d) -9 , (e) 1/2 , (f) -3/4 , (g) 3/8 , (h) -2/3
May 24, 2016

Chemistry
How to convert 4.6-10.5 micrograms/dL to nmol/L? The answer is 59-135 nmol/L, but I have no idea how to set it up to get that answer.
May 22, 2016

Math
Match the math sentences that count up and back by tens. 47+40=88 57+30=87 46+10=56 56-10=46 87-40=47 87-30=57 Write the matching math sentences.
May 18, 2016

Math
Match/Choose the math sentences that count up and back by tens. 47+40=88 57+30=87 46+10=56 56-10=46 87-40=47 87-30=57 Write the matching math sentences.
May 18, 2016

science
How does the law of conservation of matter apply to mixtures? The law of conservation of matter is a law that states matter cannot be created or destroyed. But how does that affect mixtures HELPPPPP
May 3, 2016

English
What are the elements of the literary genres of suspense and horror? How is foreshadowing used to create suspense? What is an unreliable narrator? What are the characteristics of a stock character? What is the purpose of poetic devices such as assonance, consonance, and ...
April 14, 2016

LOGARITHM
Ln(2x-1)^2=7 solve for x. Please check my answer!!! =17.0577259793 Is this number too big?
April 9, 2016

Logarithm
Please check!!! =17.0577259793 Is this number too big?
April 9, 2016

Logarithm
Ln(2x-1)^2=7 solve for x. Really confused
April 9, 2016

Logarithm
Solve for x
April 9, 2016

Logarithm
Ln2+Lnx=1
April 9, 2016

Math
Thank you
April 9, 2016

Math
2e^3x=16 Solve for x. So far I changed this to 2ln3x=16 then ln3x=8 then...
April 9, 2016

Math, science
in 2009 an earthquake of magnitude 6.7 shook the kermadec islands off the coast of new zealand. also in 2009 an earthquake of magnitude 5.1 occured in the alaska peninsula. How many times stronger was the kermadec earthquake. Use formula log (I1/I2)=m1-m2 A.39.811 B.20.593 C.5...
April 9, 2016

Algebra 2
Thanks
April 9, 2016

Algebra 2
I am confused about his question. I 3000 times.04 times 10 and added that to 3000 to get 4200 but its not an option QUESTION::suppose you deposit $3000 in a savings account that pays interest in a a rate of 4%. if no money is added or withdrawn from the account, how much will ...
April 9, 2016

Art
The right answer is The figures of various community members :(
March 30, 2016

maths,agricultur;life science,business
Why are you asking this? Only you know what Sciences interest you; not us...
March 16, 2016

Chemistry-DrBob222
A 1.0 L ball containing Ar at 5 atm is connected to a 10.0 L ball containing N2 at 2atm. A)Calculate the partial pressures and mole fractions of Ar and N2 after the valve is opened and the gases are allowed to mix (they fill the balls on both sides). My answers: P argon = 0....
March 11, 2016

Chemistry-DrBob222
I know I pored this already, but I for it to mention the assumption. See below. A calorimeter contains 30.0 mL of water at 15.0 C. When 1.50 g of X (a substance with a molar mas of 46.0g/ mol is added, it dissolves via the reaction X (s) + H2O (l) ----> X (aq) and the ...
March 11, 2016

Art Please Ms.Sue
Which two cultures use creatures to protect or transport humans after death? America (bald eagle) and Spain (bull) Egypt (the animal-headed sons of Horus) and China (the dragon)***** Egypt (the jackal) and China (the lion) Mayans (the crow) and Greeks (the raven) What symbol ...
March 11, 2016

Chemistry
Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 9 psi (vs. 14.7 psi at sea level). Under those conditions and assuming T = ...
March 11, 2016

Art Please Ms.Sue Help
Thank you your awesome. Ms.sue
March 11, 2016

Art Please Ms.Sue Help
1.How do landscape paintings convey the values and ideas of Chinese culture? A.Landscape paintings show chaotic, unhappy culture. B.Landscape paintings reveal the importance of natural history to the Chinese. C.Landscape paintings show that Chinese desire to live in simple ...
March 11, 2016

Chemistry
A calorimeter contains 30.0 mL of water at 15.0 C. When 1.50 g of X (a substance with a molar mas of 46.0g/ mol is added, it dissolves via the reaction X (s) + H2O (l) ----> X (aq) and the temperature of the solution increases to 26.5 C. Calculate the enthalpy change for ...
March 11, 2016

Chemistry- DrBob222
Please check. Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 9 psi (vs. 14.7 psi at sea level). Under those conditions and ...
March 11, 2016

Chemistry
1. Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 9 psi (vs. 14.7 psi at sea level). Under those conditions and assuming T...
March 10, 2016

Chemistry
If I was designing an experiment where hydrogen gas was collected over a 0.1 M aqueous HCl solution from the reaction with zinc metal and I assume complete, rapid reaction, what mass of zinc would be used to collect between 50 and 100 mL of the gas? Note: I calculated using ...
March 9, 2016

Chemistry
What is the equilibrium constant for a weak acid HA that dissociates 1% at an initial concentration of 0.05 M according to the following balanced chemical equation? HA <----> H+ + A-
March 8, 2016

Chemistry-DrBob222
A 10.00 mL aliquot of 0.100 M NaOH is added to 15.00 mL of 0.100M HCl in a coffee cup calorimeter. The initial temperature of the two dilute liquids were both 25.0 degrees C and the final temperature of the mixture was found to be 37.8 degrees C. What is the (molar) heat of ...
March 8, 2016

Chemistry-DrBob222
A piece of solid magnesium is reacted with hydrochloric acid to form hydrogen gas: Mg (s) + 2HCl (aq) ---> MgCl2 (aq) + H2 (g) What volume of hydrogen gas (in mL) is collected over water at 25 degrees Celsius by reaction of 0.450 g of Mg (AW= 24.3 g/mol) with 50.0 mL of 1.0...
March 8, 2016

Chemistry
Two gases are mixed in a 10.0L fixed volume flask: 8.0 L of O2 at 2.00 atm and 2.0 L of N2 at 3.00 atm. A) Calculate the partial pressure for each gas and the total pressure. I got ... PO2 = 1.60 atm PN2= 0.600 atm B) How much (volume in liters) argon at 5.0 atm must be added ...
March 8, 2016

Chemistry
Two gases are mixed in a 10.0L fixed volume flask: 8.0 L of O2 at 2.00 atm and 2.0 L of N2 at 3.00 atm. A) Calculate the partial pressure for each gas and the total pressure. I got ... PO2 = 1.60 atm PN2= 0.600 atm B) How much (volume in liters) argon at 5.0 atm must be added ...
March 8, 2016

Chemistry
A piece of solid magnesium is reacted with hydrochloric acid to form hydrogen gas: Mg (s) + 2HCl (aq) ---> MgCl2 (aq) + H2 (g) What volume of hydrogen gas (in mL) is collected over water at 25 degrees Celsius by reaction of 0.450 g of Mg (AW= 24.3 g/mol) with 50.0 mL of 1.0...
March 8, 2016

Chemsistry
Write a balanced chemical equation for this: The RXN of hydronium ion with solid calcium carbonate to form calcium and bicarbonate (HCO3-) ions.
March 7, 2016

Chemistry
Write a balanced chemical equation for this: The RXN of hydronium ion with solid calcium carbonate to form calcium and bicarbonate (HCO3-) ions.
March 7, 2016

8th grade language arts
Has anyone deemed these answers correct? Found them useful?
March 5, 2016

8th grade language arts
Has anyone deemed these answers correct? Found them useful?
March 5, 2016

Chemistry- Dr.Bob
What is the final temperature and physical state of water when 250 grams of water at 85 degrees C is added to 80.0 grams of ice at -15 degree C? Is the physical state of water liquid? The explanation from bobpursly was this The sum of heats gained =0 80(cice)(0+15)+80Hf+80cw(...
March 1, 2016

Chemistry-Dr.Bob 222
What is the final temperature and physical state of water when 250 grams of water at 85 degrees C is added to 80.0 grams of ice at -15 degree C? Is the physical state of water liquid? I still don't understand how to do this.
March 1, 2016

Chemistry
What is the final temperature and physical state of water when 250 grams of water at 85 degrees C is added to 80.0 grams of ice at -15 degree C? Is the physical state of water liquid? I don't understand the set up. The setup is like this (answered by bobpursly): The sum of...
February 29, 2016

Chemistry
CH4 (g)+ H2O (g) --->/<---- 3H2 + CO Use Le Chateliers Principle to explain what will happen to the number of moles of hydrogen at equilibrium when a) CO is removed b) Water Vapor is removed c) Methane is added d) CO is added e) Pressure is increased by adding argon gas...
February 29, 2016

Chemistry
CH4 (g)+ H2O (g) --->/<---- 3H2 + CO Use Le Chateliers Principle to explain what will happen to the number of moles of hydrogen at equilibrium when a) CO is removed b) Water Vapor is removed c) Methane is added d) CO is added e) Pressure is increased by adding argon gas...
February 29, 2016

Chemistry
What is the final temperature and physical state of water when 250 grams of water at 85 degrees C is added to 80.0 grams of ice at -15 degree C? Is the physical state of water liquid? I don't understand the set up that I have to set the equation equal to 0 ...
February 29, 2016

Chemistry
I got 1.11 x 10^-6 for K. Here is my work: x= 0.004 -2x= -0.008 (change for CH4) Equilibrium for CH4 is 0.087 - 0.008= 0.079 Change in eq for C2H2 is 0.004 and eq is 0.004 (=x) Change in eq for H2 is 0.012 Eq for H2 is 0.012 K= [C2H2][H2]^3/[CH4]^2 K= (0.004)(0.012)^3/(0.079)^...
February 29, 2016

Chemistry
The reaction of CH4 in 2CH4(g) ---->/<---- C2H2(g) + 3 H2 (g) is carried out at a different temperature with an initial concentration of [CH4]=0.087M. At equilibrium, the concentration of H2 is 0.012 M. Find the equilibrium constant at this temperature.
February 28, 2016

Chemistry
how does one go about finding the Tf of this equation 100Hf+100cw(Tf-0) + 300w(Tf-25) =0 and can you also explain what cw and Hf mean? i have no idea.
February 24, 2016

Chemistry
What is the final temperature and physical state of water when 250 grams of water at 85 degrees C is added to 80.0 grams of ice at -15 degree C? Is Tf= 109 C? Is it in the steam phase?
February 24, 2016

Chemistry
A 1.1% (w/w) solution of cocaine hydrochloride (molar mass 339.81 g/mol) in water. Calculate the molal concentration. Is it 0.0297 mol/kg?
February 22, 2016

Math
Please explain and show your work 2 3 -+- 3 4
February 22, 2016

Chemistry-Dr.Bob 222
1. The rate constant for a second order reaction has units of L mol^-1 s^-1. What are the units of the frequency factor, A, for a second order reaction?
February 19, 2016

Chemistry
Calculate the molal concentration. A 1% (w/w) solution of cocaine hydrochloride ( molar mass 339.81 g/mol) in water.
February 18, 2016

Chemistry
On a clear day at sea level, the partial pressure of N2 in air is 0.78 atm at 25 degres C. Under these conditions, the concentration of N2 in water is 5.3 x 10^-4 M. What is the partial pressure of N2 when the concentration in water is 3.5 x10^-4 M?
February 17, 2016

Student
On a clear day at sea level, the partial pressure of N2 in air is 0.78 atm at 25 degres C. Under these conditions, the concentration of N2 in water is 5.3 x 10^-4 M. What is the partial pressure of N2 when the concentration in water is 3.5 x10^-4 M?
February 17, 2016

Economy
Can anyone compare and contrast N. korea and S. Korea economic provisions on private property ? Then compare to the U.S. Economic provisions on private property ? I'm really confused and I don't know much of the subject. This was a Classwork qtn. Thanks.
February 16, 2016

Economics
4. Deregulation and the Cost of Trucking. Suppose the government initially limits the number of trucking firms that can haul freight. The market for truck freight is served by a single firm that produces five million ton-miles of service per year, where one ton-mile is the ...
February 14, 2016

Chemistry
A solution containing equal masses of glycerol, C3H8O3, and water has a density of 1.10 g/mL. Calculate the molality of glycerol. I got 11.9 m.
February 14, 2016

Chemistry
A first-order reaction has a half-life of 26.4 seconds. How long does it take for the concentration of the reactant in the reaction to fall to one-eighth of its initial value?
February 14, 2016

Chemistry
1. As the intermolecular forces between molecules increase in magnitude, do you expect each of the following to increase, decrease or remain the same? My answers: Viscosity: increase Boiling point: increase Vapor pressure: decrease Surface tension: increase Heat of ...
February 14, 2016

Chemistry
A solution containing equal masses of glycerol, C3H8O3, and water has a density of 1.10 g/mL. Calculate the molality of glycerol. I got 11.9 m.
February 14, 2016

Chemistry
1. As the intermolecular forces between molecules increase in magnitude, do you expect each of the following to increase, decrease or remain the same? My answers: Viscosity: increase Boiling point: increase Vapor pressure: decrease Surface tension: increase Heat of ...
February 13, 2016

Chemistry-Dr.Bob
The solubility of CO2 in water at 25 degrees Celsius and P CO2= 1 atm is 0.034 mol/L. What is its water solubility under normal atmospheric conditions (in air, carbon dioxide is about 380 ppmv assuming that CO2 obeys Henry's Law?
February 13, 2016

Math
The volume of a rectangular prism is 6x^3 -x^2 -2x. Which model could represent the rectangular prism? A. Height: 3x-2 Length: 2x+1 Width: x B. Height: 3x+2 Length: 2x-1 Width: x C. Height: 3x-2 Length: 2x-1 Width: x D. Height: 2x-2 Length: 3x+1 Width: x I don't understand...
January 29, 2016

Math, pre-algebra
The volume of a rectangular prism is 6x^3 -x^2 -2x. Which model could represent the rectangular prism? A. Height: 3x-2 Length: 2x+1 Width: x B. Height: 3x+2 Length: 2x-1 Width: x C. Height: 3x-2 Length: 2x-1 Width: x D. Height: 2x-2 Length: 3x+1 Width: x I don't understand...
January 29, 2016

Connexus Help me!!
Congratulations, Shantee!! When is your baby due? Is it a boy or a girl? Good for you!
January 27, 2016

Math
Our difference is 6. We have a sum of 14. What numbers are we? We know number 10. How did you find 4? Please describe and solve the riddle.Write the number sentence.
January 26, 2016

Math
F(x) = square root of x-6 -5
January 22, 2016

Algebra
Find the perimeter of the triangle whose vertices are the following specified points in the plane (-2,-7) (1,-6) and (-7,7)
January 13, 2016

Algebra
Find the perimeter of the triangle whose certified are the following specified points in the plane (5,-1) (-9,3) and (0,1
January 12, 2016

U.S History
Ms. Sue please help I really need it!!!
January 5, 2016

U.S History
Which of these describes the location of the Gulf of Mexico? (5 points) South of West Florida East of East Florida*** West of New Orleans South of Great Britain 4. © 2012 The Exploration Company What can you infer about what Lewis and Clark saw as they moved west from the...
January 5, 2016

U.S History
Ms. Sue please help!!!!
January 5, 2016

U.S History
Which of these describes the location of the Gulf of Mexico? A. South of West Florida B. East of East Florida C. West of New Orleans D. South of Great Britain I think its A.
January 5, 2016

Algebra
The perimeter of a square must be greater than 40 inches but less than 94 inches. Find the range of possible side lengths yay satisfy these conditions.
January 5, 2016

Algebra
8w less than or equal to 9w - 5 or 1-4w > 25. Enter the solution using interval notation?
January 5, 2016

Algebra
Among all rectangles that have a perimeter of 184, find the dimensions of one whose area is largest. Write your answers as fractions reduced to lowest terms.
January 4, 2016

Math
Find the standard form for the equation for the circle center (-4,7/4) and tangent to the y axis
January 4, 2016

Algebra
Compare the graph of a compound inequality involving and with the graph of a compound inequality involving or.
December 21, 2015

Algebra
What compound inequality represents the phrase "all real numbers that are greater than or equal to 0 and less than 8"
December 21, 2015

Algebra
Write an inequality for Six times a number increased by 38 is no more than the number decreased by 14
December 20, 2015

Algebra
Whats an inequality for negative three sevenths of a number is at least 102.
December 20, 2015

Phyical Science
I already got the answer
December 14, 2015

Phyical Science
Which is more expensive to create wind power or natural gas?
December 14, 2015

Inequalities
Write two different inequalities that you can solve by adding 5 and multiplying by -3.
December 13, 2015

Math
A system of equations is shown below: x + y = 3 2x − y = 6 The x-coordinate of the solution to this system of equations is _____. I'm thinking it could be X=3
December 11, 2015

Math
Steve, what is dr/dt? how did you get 1/8pi?
November 30, 2015

Health ( ANSWER ASAP)
what are the answers?
November 30, 2015

Math
Thx so much
November 11, 2015

Math
hello what is b + 6 1/8= 5 3/4
November 11, 2015

Algebra Math
Thank you!!
November 11, 2015

math
These were the multiple choice answers given to me for this problem which don't seem to make sense because I keep getting $4200 A. $3122.18 B. $4994.50 C. $4440.73 D. $86776.40
November 9, 2015

Physics
If a ball has a weight of 6.8N what is the centripetal force of the string
October 21, 2015

Math
ok thanks again.
October 19, 2015

Math
ok thank u
October 19, 2015

Math
the end without the tip
October 19, 2015

Math
what is the measurement of the end of a crayon in cm
October 19, 2015

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