1. Chemistry Urgent

    1) 30cm3 of methane and ethane mixed with 100cm3 of O2 at RTP. Explosion occurs, on cooling 61.5cm3 remained. Find the percentage by volume of each gas in the mixture 2)32cm3 of a mix of CO2, CH4 and H2 mix with 50cm3 of O2 and exploded after cooling to

    asked by Ava on February 10, 2014
  2. English

    I forgot to include these very last sentences. Thank you very much! 1) From 1982 to 2005 (two thousand and five/twenty oh five) he worked hard and appeared in 29 films. How long did he work hard? From when to when did he work hard? How many films did he

    asked by Franco on January 7, 2011
  3. math

    This was the question : Explain why the formula for determining slope using the coordinates of two points does not apply to vertical lines. This is my answer:The formula for determining a slope using two points does not apply to vertical lines simply

    asked by Liza on November 18, 2009
  4. HARD CHEM QUESTION- any help appreciated

    Phosgene (COCl2) is a poisonous gas that dissociates at high temperature into two other poisonous gases, carbon monoxide and chlorine with equilibrium constant Kp = 0.0041 at 600 K. Find the equilibrium composition of the system after 0.124 atm of COCl2 is

    asked by scilover on May 13, 2013
  5. physics

    A 0.50 kg mass at the end of a spring vibrates 6.0 times per second with an amplitude of 0.18 m. (a) Determine the velocity when it passes the equilibrium point. 1Your answer is incorrect. m/s (b) Determine the velocity when it is 0.02 m from equilibrium.

    asked by sway on April 21, 2010
  6. science

    A light inelastic string connects two objects of mass 6kg and 3kg respectively. They are pulled up an inclined plane that makes an angle of 30 degrees with the horizontal,with a force of magnitude F. Ignore the mass of the string. Calculate the tension in

    asked by zama on February 14, 2016
  7. physic

    A 1019kg shark is supported by an 85kg rope attached to a 4.00-m rod that can pivot at the base. (a) Calculate the tension in the cable between the rod and the wall, assuming that the cable is holding the system in the position shown in Figure below. Find

    asked by miran on June 11, 2015
  8. chem

    Predict the direction of the net reaction in each of the following system, as a result of increasing the temperature. Delta H is an indicator or whether the reaction releases heat delta H(-), or heat is absorb delta H(+). Write where the direction shifts.

    asked by Angel Locsin on November 28, 2012
  9. physics

    A solid, horizontal cylinder of mass 8.0 kg and radius 1.30 m rotates with an angular speed of 5.50 rad/s about a fixed vertical axis through its center. A 0.250 kg piece of putty is dropped vertically onto the cylinder at a point 0.900 m from the center

    asked by Dani on May 3, 2011
  10. Chemistry

    My question is why is benzene less reactive than 1,3,5-cyclohexatriene? I know that benzene does not undergo addition reactions and is extremely stable to oxidizing reagents. C atoms in benzene are connected by delocalized double bonds which make them

    asked by Megan on February 10, 2008
  11. Health

    You're an inpatient coder in a hospital. You've just coded a Medicare Part A record with a diagnosis-related group reimbursement of 12,000. You notice in the hospital's computer billing system that the patient's charges are 19,500. That's 7,500 more than

    asked by Anonymous on September 30, 2008
  12. Health

    You're an inpatient coder in a hospital. You've just coded a Medicare Part A record with a diagnosis-related group reimbursement of 12,000. You notice in the hospital's computer billing system that the patient's charges are 19,500. That's 7,500 more than

    asked by Anonymous on September 29, 2008
  13. Anthropology

    If a friend were to say, “ He’s the president of the college” the term “president” would refer to an: a)status b)role c)social situation d)social relationship e)social interaction a group ranked in a system of social stratification into which

    asked by TAYLOR M B on December 15, 2011
  14. Chemistry

    My question is why is benzene less reactive than 1,3,5-cyclohexatriene? I know that benzene does not undergo addition reactions and is extremely stable to oxidizing reagents. C atoms in benzene are connected by delocalized double bonds which make them

    asked by Megan on February 10, 2008
  15. science

    input and output are good words to use when discussing systems because.. Two in puts, two outputs, and two side effects of the health care system are... The inputs to a garden that occur naturally are.. THe inputs that are provided by humans are.. Systems

    asked by beeca on February 8, 2009
  16. History

    Hey, everyone! Do you mind helping me check my history questions for accuracy? Thanks! 1. "Living by Faith" by Charles G. Finny is representative of which of the following movements? a. Revivalism b. Transcendentalism c. Nativism d. Deism My Answer: A 2.

    asked by Elizabeth on October 29, 2017
  17. Physics 141

    A mine car (mass mcar = 444 kg) rolls at a speed of vcar = 0.52 m/s on a horizontal track, as the drawing shows. An mcoal = 141 kg chunk of coal has a speed of vcoal = 0.79 m/s when it leaves the chute. Determine the speed of the car-coal system after the

    asked by dakota22 on March 11, 2014
  18. Physics

    A string going over a massless frictionless pulley connects two blocks of masses 6.4 kg and 13 kg. As shown on the picture below, the 6.4 kg block lies on a 32◦ incline; the coefficient of kinetic friction between the block and the incline is μ= 0.3.

    asked by mallak on February 21, 2014
  19. S.S

    of the following statements which of the following best represents the role of the judicial branch of the government a. the judicial branch tries employees that are accused of committing a crime b. the judicial branch has the ability to declare a law

    asked by REED OR MS.SUE on September 28, 2017
  20. Physics

    A string going over a massless frictionless pulley connects two blocks of masses 6.4 kg and 13 kg. As shown on the picture below, the 6.4 kg block lies on a 32◦ incline; the coefficient of kinetic friction between the block and the incline is μ= 0.3.

    asked by Emeera on March 6, 2014
  21. US History

    of the following statements which of the following best represents the role of the judicial branch of the government a. the judicial branch tries employees that are accused of committing a crime b. the judicial branch has the ability to declare a law

    asked by Ibra on September 19, 2017
  22. math /algebra

    This was the : Explain why the formula for determining slope using the coordinates of two points does not apply to vertical lines. This is my answer:The formula for determining a slope using two points does not apply to vertical lines simply because

    asked by Liza on November 18, 2009
  23. Science

    I really need help! Can someone tell me if my answer is correct? Question; Explain the difference between carbon-14 reading for the human skull and brown rock. Why is there such a difference? What does this tell you about dating extremely old objects? My

    asked by Sage on December 17, 2015
  24. AIU

    You are the lead human–computer interaction (HCI) engineer on a major defense project supporting the government and its integration of a new system and application design for use by federal investigators. Part of your job is to elicit and define the user

    asked by ronald on March 25, 2012
  25. Physics

    A sample of 60 grams of water at 56°C is mixed in a styrofoam container with 89 grams of water at 30°C. What is the final temperature of the water? Assume the styrofoam container is a closed system. 48°C 40°C 38°C 51°C

    asked by weedle on May 23, 2018
  26. ENGLISH

    Hello! I coreccted my homework and tomorrow I have to give a homework wich is written in a perfectenglish Please correct my mistakes. I don't have to do mistakes because when I will go to N-y I will be ridiulous President Obama had a controversial first

    asked by Marie on January 18, 2010
  27. Stats

    Sooo I'm a little confused on these 2 questions: 1. Sample: a. method of collecting, presenting, and describing sample data b. a numerical value summarizing all the data of an entire population c. a collection, or set, of individuals, objects, or event

    asked by mysterychicken on June 11, 2013
  28. economics

    Kimberly works for a well known financial company as a sales representative. She earns a small base salary but receives commission off every product she sells. Kimberly has basic living expenses in addition to a student loan. She wants to start adding to

    asked by john on January 16, 2013
  29. chem12

    2HI(g)--H2(g) + I2(g) k eq= 8.0 2.0 mol of HI are placed in a 4.0L container, and the system is allowed to reach equilibrium. Calculate the equilibrium concentration of all three gases Initial 2HI=0.5 mol/L H2= 0 I2=0 change 2HI= -2x H2= x I2=x equilibrium

    asked by George on March 13, 2016
  30. Science

    An electric eel can generate a voltage of 600V across its body. The eel does this via a system of up to 6000 “electroplaques” inside its body. What is the average strength of the electric field in V/m inside the body of a 10cm wide eel?

    asked by Khizar on February 21, 2014
  31. Physics

    block a 10 kg is connected to block b 20 kg by a mass less string on a horizontal surface (coefficient of kinetic friction 0.1). block b is connected by another string to a hanging mass M through a mass less pulley. what is the minimun value of M that will

    asked by Anthony on August 15, 2013
  32. Chemistry

    Calculate the DELTA H(rxn), DELTA S(rxn), DELTA S(universe), DELTA G(rxn). For each system below indicate whether DELTA S and DELTA H are positive or negative. Then indicate if the reaction is entropy driven, enthalpy driven or neither. C3H8(g) + 2O2(g) =>

    asked by Zach on September 19, 2008
  33. chem12

    2HI(g)--H2(g) + I2(g) k eq= 8.0 2.0 mol of HI are placed in a 4.0L container, and the system is allowed to reach equilibrium. Calculate the equilibrium concentration of all three gases Initial 2HI=0.5 mol/L H2= 0 I2=0 change 2HI= -2x H2= x I2=x equilibrium

    asked by George on March 14, 2016
  34. Chem

    To prepare 20 mL of 15 mM NaCl, how much NaCl would you need to weigh? 2. To prepare 5 mL of 1 mM glucose, how much glucose would you need to weigh? How do you prepare 1 mL of 1 mM NaCl using the NaCl solution you prepared in (1)? 3. How do you prepare 1

    asked by Ethan on September 30, 2018
  35. Physics

    Physics Report! What should i write..please help me need ideas !best answer!? Well First my report should be focused on Circular Motion OR Energy and momentum All the report says is to spend a day or two analysing the world around you in terms of Linear

    asked by Rodney on April 13, 2012
  36. chemistry

    Consider the reaction 2 Al2O3(s) → 4 Al(s) + 3 O2(g). ∆H = +3339.6 kJ/mol What is the change in heat when 0.455 L of a 3.60 M Al solution reacts with excess O2 ? 1. -21,962 kJ 2. -2735 kJ 3. -1368 kJ 4. -26,521 kJ 5. -685 kJ 6. -5477 kJ 7. -424 kJ 8.

    asked by Anonymous on October 15, 2017
  37. chemistry concentrations

    You have combined the following: 7.92mL of 1.122M Fe(NO3)3(aq), 5.02mL of 1.849M NaCl(aq), and 7.09mL of water. What is the concentration of chloride ions in the resulting solution? Assume liquid volumes are additive

    asked by Jaden on February 20, 2013
  38. Chemistry

    You dissolve 6g of Co(ClO4)2 (molar mass: 257.83) in 1 liter of water. Assuming the entire sample dissolves, how many individual perchlorate ions are present in this solution? I'm so lost where to start.

    asked by Nikela on March 23, 2016
  39. math

    Mary Fairfax Somervilee was a nineteenth century mathematician in England. To discover the year in which she was awarded a silver medal for her solution to the Diophantine equation, find the value of the following expression: 3(1 + 3 + 5 + ... + 51) - 221

    asked by Jas on March 18, 2008
  40. Biochemistry

    What volume (in milliliters) of 0.180 M NaOH should be added to a 0.135 L solution of 0.0230 M glycine hydrochloride (pKa1 = 2.350, pKa2 = 9.778) to adjust the pH to 2.73? Plz help, I'm not sure how to answer the question! Thank you!!

    asked by Deena12 on January 22, 2018
  41. chem

    Suppose you are given a sample of a homogeneous liquid, consisting of a non-volatile solute and a suitable solvent. What would you do to determine whether it is a solution, colloid, suspension or a pure substance? Cite reasons for your answer..

    asked by Anonymous on August 8, 2010
  42. chemistry

    Calculate the amount (volume) of 6.25% (wt./vol.) NaOCl solution (commercial bleach) required to oxidize 150 mg of 9-fluorenol to 9-fluorenone. Whenever appropriate, use balanced chemical equations as a part of your calculation

    asked by Fann on January 31, 2010
  43. AP Chem

    Consider the reaction 2 Al2O3(s) -> 4 Al(s) + 3 O2(g) . H = +3339.6 kJ/mol What is the change in heat when 0.455 L of a 3.60 M Al solution reacts with excess O2 ? 1. -685 kJ 2. -21,962 kJ 3. -1368 kJ 4. -2738 kJ 5. -5477 kJ 6. -26,521 kJ 7. -424 kJ 8.

    asked by Beth on November 7, 2010
  44. AP Chemistry

    We drop 30 grams of magnesium into 770 mL of a 4 M HCl solution. What is the maximum volume of dry hydrogen that could be produced by this reaction at STP? Mg(s) + 2HCl(aq)→MgCl2(aq) + H2(g) Answer in units of liters

    asked by Gabriella on February 16, 2014
  45. chemistry

    A buffer with a pH of 4.30 contains 0.25 M of sodium benzoate and 0.20 M of benzoic acid. What is the concentration of [H ] in the solution after the addition of 0.052 mol of HCl to a final volume of 1.5 L? I know that Ka = 6.3x10-5 do I need to use an ice

    asked by noel on April 11, 2015
  46. Science

    A student mistakenly used an ethanol solution containing an unknown ionic compound in part C of the experiment. How would this affect the Van't Hoff factor determined experimentally? Justify your answer with an explanation.

    asked by Lisa on September 16, 2015
  47. Chemistry

    A buffer is prepared by mixng 150.0 mL of 0.500 M ammonia, 250.0 mL of 0.200 M ammonium chloride and 600.0 mL of water. To this solution is added 50.0 mL of 0400 M hydrochloric acid. What is the final pH?

    asked by Cathy on December 9, 2009
  48. Chemistry

    Use two concentration tables to calculate the concentrations of the species present in a 0.0400 M solution of CsBrO. a.[HBrO] b.[BrO-] = 0.0400M c. [H3O+] d.[OH-] hi. how would I attempt this problem. can you walk me through it or give me a hint.

    asked by J on November 14, 2016
  49. chemistry

    Consider the reaction 2 Al2O3(s) → 4 Al(s) + 3 O2(g). ∆H = +3339.6 kJ/mol What is the change in heat when 0.455 L of a 3.60 M Al solution reacts with excess O2 ? 1. -21,962 kJ 2. -2735 kJ 3. -1368 kJ 4. -26,521 kJ 5. -685 kJ 6. -5477 kJ 7.

    asked by abdullah on October 15, 2017
  50. chemistry

    What is the hydrogen ion concentration, in mol dm−3, when 2.00 g of sulfuric acid is dissolved in water to give 0.400 dm3 of solution? could you explain in a simple and clear way please because im not very good at chemistry. thanks in advance

    asked by becky on May 19, 2013
  51. Chemistry

    Calculate the amount (volume) of 6.25% (wt./vol.) NaOCl solution (commercial bleach) required to oxidize 150 mg of 9-fluorenol to 9-fluorenone. Whenever appropriate, use balanced chemical equations as a part of your calculation.

    asked by Shannon on February 1, 2011
  52. chemistry

    Calculate the amount (volume) of 5.25% (wt./vol.) NaOCl solution (commercial bleach) required to oxidize 100mg of 9-fluorenol to 9-fluorenone. Whenever appropriate, use balanced chemical equations as a part of your calculation.

    asked by Jane on February 2, 2009
  53. Science

    I would recommend to check out a website called physmatixsolve They helped me with a tough question i got in my Physics homework, classical mechanics. The amazing thing is that they really sent me the solution in less than 24 hours, which is pretty neat.

    asked by Dan on April 25, 2011
  54. Chemistry

    I need help with this problem: 50.0 mL of 4.4 g/L AgNO3 is added to a coffee-cup calorimeter containing 50.0 mL of 4.4 g/L NaI, with both solutions at 25°C. a).What is ΔTsoln (assume the volumes are additive and the solution has the density and

    asked by CJ on October 13, 2008
  55. Biochemistry

    What volume (in milliliters) of 0.180 M NaOH should be added to a 0.135 L solution of 0.0230 M glycine hydrochloride (pKa1 = 2.350, pKa2 = 9.778) to adjust the pH to 2.73? Plz help, I'm not sure how to answer the question! Thank you!!

    asked by Deena12 on January 21, 2018
  56. Chemistry

    How do I calcuate this? How much heat is gained (in Joules) by the water (qwater) when a chemical reaction takes place in 100.0 mL aqueous solution and has a temperature increase of 13.26 °C? (Remember cwater = 4.180 J/°Cg)

    asked by Mary on June 29, 2013
  57. chemistry

    Calcultate the volume (in mL)of 0.250M silver nitrate solution required to react completely with a 5.00g piece of copper wire. (Assume the reaction runs at 100% yield.)

    asked by Tinkerbell on April 13, 2011
  58. ochem

    Calculate the amount (volume) of 5.25% (wt./vol.) NaOCl solution (commercial bleach) required to oxidize 100 mg of 9-fluorenol to 9-fluorenone. Whenever appropriate, use balanced chemical equations as a part of your calculation.

    asked by steve on January 29, 2009
  59. Chemistry

    I have to write a paper and bring in examples of each type of mixture for a class feast(so it needs to be edible). I want to know if i'm correct on the two that i have and i need an example of another and why it is it. I have Kool-Aid for a solution, jello

    asked by Anthony on April 13, 2008
  60. Chemistry

    how can i know if a solution is aqueous or solid? i have a test tomorrow and don't know how to do this PLEASE HELP!!! i have this question on my homework...Will precipitation occur when the following solutions are mixed? 1. Na2Co3 and AgNO3 2. NaNO3 and

    asked by nina on October 4, 2009
  61. ap chemistry

    We drop 37.4 grams of magnesium into 461 mL of a 3 M HCl solution. What is the maximum volume of dry hydrogen that could be produced by this reaction at STP? Mg(s) + 2HCl(aq) ! MgCl2(aq) + H2(g) Answer in units of liters

    asked by cheri on February 10, 2013
  62. chem101

    Which of the following solutes in aqueous solution would be expected to exhibit the LARGEST freezing-point lowering (assuming ideal behavior)? A. 0.1 m NaCl B. 0.2 m CH3COOH C. 0.1 m MgCl2 D. 0.05 m Al2(SO4)3 E. 0.25 m NH3

    asked by joan on June 20, 2010
  63. Chemistry

    Calcultate the volume (in mL)of 0.250M silver nitrate solution required to react completely with a 5.00g piece of copper wire. (Assume the reaction runs at 100% yield.)

    asked by Tinkerbell* on April 15, 2011
  64. Analytical Chemistry

    I need to prepare a standard iron solution by dissolving an appropriate mass of solid Fe(NH4)2(SO4)2*6H2O in water in a 1L volumetric flask containing 1 ml of 96 wt% H2SO4. The final concentration should be ~40mg/L. How would I calculate the this?

    asked by Ryan on April 19, 2011
  65. chemistry grade 11

    ferrous sulfate was prepared by dissolution of x grams p feso4.7H20 crystals in 500 ml water. 20 ml of this solution necessities 5 ml of 0.1mol/l kmn04 for the pink color to persist. find x

    asked by lana on January 4, 2017
  66. Organic Chemistry 51B

    calculate the amount (volume) of 6.25% (wt./vol.) NaOCl solution (commercial bleach) required to oxidize 150 mg of 9-fluorenol to 9-fluorenone. Whenever appropriate, use balanced chemical equations as a part of your calculation.

    asked by Anonymous on February 1, 2010
  67. chemistry

    Calculate [acetate] of 0.057 mol/L solution of acetic acid of Ka = 1.76x10^-5 i know to find Ka it's: Ka= products/reactants so i tried doing an ICE table with the equation to be: CH3CO2 + H2O CH3COOH + H am i on the right track? if not...help please!

    asked by Kat on July 28, 2010
  68. Psychology

    Is society adequately preparing for the physical and mental wellness of the elderly? Does the concept of an integrated approach to health care for the growing older adult population appear to be a viable solution?

    asked by Regina on September 27, 2018
  69. Chemistry

    In terms of a buffer solution, can one exist with a strong acid and of weak base in equal volumes but different molarities? e.g. 0.1 HCl and 0.2 NH3? I found this to be the case but still can't find a logical reasoning behind it.

    asked by Vic on September 3, 2007
  70. Chemistry

    how do you calculate the mass of sodium ions in a 500ml bag of saline solution concentration 20.0 mmol l-1. A 100ml aliquot is analysed using silver nitrate, the precipitate weighs 0.2866g

    asked by Honey on June 4, 2012
  71. AP Chemistry

    Consider the reaction 2 Al2O3(s) ! 4 Al(s) + 3 O2(g) . H = +3339.6 kJ/mol What is the change in heat when 0.455 L of a 3.60 M Al solution reacts with excess O2 ? 1. -424 kJ 2. -2735 kJ 3. -1695 kJ 4. -1368 kJ 5. -26,521 kJ 6. -21,962 kJ 7. -685 kJ 8.

    asked by Anonymous on September 29, 2013
  72. English-Literature

    In the poem Catching up with Flanner O'Connor, in line 1 the use of the word "squalled" helps to? A. Illuminate a solution B. Describe crying C. Characterize a relationship D. Predict an event E. Forshawdow the weather

    asked by Victoria on July 27, 2010
  73. Physics

    Pls help with a solution.....a boy of mass 8kg falls from rest from a height of 100m neglecing air resistance calculate his total energy after fallin down a distance of 40m

    asked by Mozes dixon on January 19, 2012
  74. Advance Finance

    The Howland Carpet Company has grown rapidly during the past 5 years. Recently, its commercial bank urged the company to consider increasing its permanent financing. Its bank loan under a line of credit has risen to $250,000, carrying an 8 percent interest

    asked by Kim on March 6, 2011
  75. physics

    A 1.79 kg block slides across a horizontal surface directly toward a massless spring with spring constant 5,300 N/m. The surface is frictionless except for a rough patch of length 0.45 m that has coefficient of kinetic friction 0.28. The initial velocity

    asked by Mike on July 24, 2012
  76. Physics

    Three objects are connected on an inclined table as shown in the diagram below. The objects have masses 8.0 kg, 4.0 kg and 2.0 kg as shown, and the pulleys are frictionless. The tabletop is rough, with a coefficient of kinetic friction of 0.47, and makes

    asked by Joeline on May 18, 2013
  77. Calculus

    The seesaw principle: As you probably know, any two persons can balance each other when sitting on opposite sides of a seesaw, regardless of their weights. It is only necessary that each person contribute the same moment — calculated by multiplying

    asked by chamy on April 8, 2012
  78. History

    Question 1 In 1907, in order to balance the Triple Alliance, the Triple Entente was formed by Answer (A)Italy, France, and Britain. (B)France, Russia, and Britain. (c) France, Russia, and Germany. (D)Russia, Britain, and the United States. (E)Britain, the

    asked by Adesuwa on August 25, 2010
  79. Physics

    A 50 kg box rests on a smooth frictionless table. Connected to the box is a light string passing through a pulley at the end of the table. Suspended on rhe other end of the string is a 20 kg box. Find a) acceleration of the system, b) the tension in the

    asked by JOSH on August 19, 2014
  80. physics

    Two pucks moving on a friction less air table are about to collide. The 1.5 kg puck is moving directly east at 2 m/s. the 4 kg puck is moving directly north at 1 m/s. What is the total kinetic energy of the two-puck system before the collision? a) sqrt(13)

    asked by me on December 28, 2006
  81. Physics

    A 90 kg person stands on the ground before jumping vertically upward. If momentum is truly conserved in all closed isolated systems, then the Earth-person system should conserve momentum. If the person jumps with a speed of 3.5 m/s, what is resulting speed

    asked by JuJu on December 4, 2011
  82. Banking & Money

    A couple True/False questions I'm stumped on. True or False: Most social security analysts now agree that a pure PAYG (pay as you go) system is not sustainable. True or False: Only 10 countries in the world have social security systems with funded

    asked by Bobby on November 2, 2009
  83. ALGEBRA

    Bill is solving the equation 26x−21(6x+51)=40(11x+139). The following shows the steps he has used so far to solve the equation. Step1:26x−21(6x)−21(51)=40(11x)+40(139) Step2:26x−126x−1071=440x+5560 Which statement describes a possible next step

    asked by c2v5 on November 13, 2013
  84. English

    I would like to see what other modifications (what should I include, remove, make more presentable, recommend a particular font style, etc) I need to make on my resume per your opinions. Any help is greatly appreciated. I removed my personal information

    asked by Manny on January 14, 2008
  85. Algebra

    plane ascends at a 40° angle. When it reaches an altitude of one hundred feet, how much ground distance has it covered? To solve, use the trigonometric chart. Round the answer to the nearest tenth.

    asked by Pedro on October 9, 2009
  86. maths

    1a) Solve each of these questions by factorising the left hand side into a product of linear factors: (i) x^2 - 6x - 40 = 0 (ii) 3x^2 + 20x - 7 = 0 For each question in part (a), check your solutions by substituting them back in to the equation.

    asked by Steve on October 24, 2016
  87. math

    how do i solve for this question? Mr. Smith wants to save for his son's college education. If he deposits $300 each month at 10% compounded monthly, how much (to the nearest penny) will he have in the account after 14 years? Answer =

    asked by amanda on September 17, 2010
  88. Physics - Doppler Effect

    How fast is a car moving and in what direction if the frequency of the horn drops from 900 Hz to 875 Hz, as heard by a stationary listener? The air temperature is 0oC. How to solve? I have no idea...

    asked by lost in life on June 2, 2016
  89. Math help

    Mt. Everest is more than 8000 m high. How fast would an object be moving if it could free fall to sea level after being released from an 4750-m elevation? (Ignore air resistance) How would I solve this?

    asked by Hanna on September 30, 2015
  90. maths

    Solve each of these questions by factorising the left hand side into a product of linear factors: (i) x^2 - 6x - 40 = 0 (ii) 3x^2 + 20x - 7 = 0 For each question in part (a), check your solutions by substituting them back in to the equation.

    asked by Saphina AlMatary on October 24, 2016
  91. physics

    What is the required resistance of an immersion heater that will increase the temperature of 1.5kg of water from 10*C to 50*C in 10 min while opperating at 120V? The answer is 24.2 ohms. I don't know what equation to use to solve this question. Please help

    asked by Anonymous on February 23, 2008
  92. Algebra 1

    Find the roots of each quadratic polynomial. 1. 16x + 40 + 2x^2 A: No real solutions? Solve. Round to the nearest hundredth. 2. 12 = 5x^2 A: 12 = 5x^2 12 / 5 = 5x / 5 12/5 = x^2 ±2√3/5 = ±√4x3/5 = ±√12/5 = x x = ? (Supposedly, the answer to this

    asked by Victoria on May 9, 2014
  93. pH- from saturday

    i posted this question previously and got help however im still having some confusion. can u clarify ? what's the pH of the acid HC2H3O2 with concentration of .15? Bob Pursley worked that problem for you and gave it as [x^2/0.15] = Ka. What is it you don't

    asked by Christine on April 15, 2007
  94. maths

    1a) Solve each of these questions by factorising the left hand side into a product of linear factors: (i) x^2 - 6x - 40 = 0 (ii) 3x^2 + 20x - 7 = 0 For each question in part (a), check your solutions by substituting them back in to the equation.

    asked by Saphina AlMatary on October 24, 2016
  95. Chemistry

    Need guidance on how to solve this one How many liters of water vapor can be produced if 108 grams of methane gas are conbusted at 312K and 98 atm. CH4 + 202 = C02 + 2H20

    asked by Anonymous on July 24, 2011
  96. Math

    An average song is 5,000 bytes (5B). ow many songs can an 4 gigabyte mp3 player store? I'm not looking for an answer, but please explain how to solve this problem? I'm confused. There are many other problems like this on my homework and I don't know what

    asked by Anonymous on January 1, 2012
  97. Trigonometry

    Solve 2cos^2θ/2 = cos2θ for 0º≤θ≤360º. (Hint: Graph each side of the equation and find the points of intersection.) A) ≈73.8º; 260.4º B) ≈141.3º; 218.7º C) ≈225.7º; 315.8º D) ≈51.7º; 138.2º

    asked by TeeKay on October 21, 2014
  98. Calcalus

    Solve the equations below exactly Give your answers in radians, and find all possible values for t If there is more than one answer, enter your solutions in a comma separated list (a) sin(t)= sqroot(2)/2 when t= (b) cos(t)=1/2 when t= (c) tan(t)=-1 when t=

    asked by Bob on April 9, 2017
  99. College Algebra

    I have a few more questions that I'm not understanding. Its multiple choice however I would appreciate a breakdown on how to solve. 1.Evaluate without a calculator, using the order of operations. -2^2+20-|8-20|-squareroot of 64 a. -36 b. 4 c. 28 d. -4

    asked by Krissy on January 15, 2013
  100. trig

    A plane ascends at a 40° angle. When it reaches an altitude of one hundred feet, how much ground distance has it covered? To solve, use the trigonometric chart. Round the answer to the nearest tenth.

    asked by Anonymous on February 3, 2010

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