Questions Asked on
April 16, 2011

  1. algebra

    The Length of time (T) in seconds it takes the pendulum of a clock to swint through one complete cycle is given by the formula T=2pie square root of 7 divided by 32 where L is the length in feet, of the pendulum, and pie is approximately 22 divided by 7.

    asked by Carolyn
  2. chemistry

    Explain why methanol spontaneously evaporates in open air at 25.0 . I know that a negative delta G means a spontanious reaction, but I don't think this is an adequate response to this question. I need a little more clarity about this. thanks

    asked by redgy
  3. chem

    please help me? :) topic: standard enthalpies of formation "Calculate ΔHf° of octane, C8H18(l), given the entalpy of combustion of octane to CO2(g) and H2O(l) is -5471kJ/mol. The standard enthalpies of formation ofCO2 and H2O are given:

    asked by marie
  4. physics

    Challenger Deep in the Marianas Trench of the Pacific Ocean is the deepest known spot in the Earth's oceans, at 10.922 km below sea level. Taking density of seawater at atmospheric pressure (p0 = 101.3 kPa) to be 1024 kg/m3 and its bulk modulus to be B(p)

    asked by Anonymous
  5. PRECALCULUS HELP PLEASE!

    convert the polar equation to rectangular form. 1.) r sec(theta) = 3 2.) r = 4 cos(theta) - 4 sin(theta) convert from rectangular equation to polar form. 1.) x^2 + (y-1)^2 = 1 2.) (x-1)^2 + (y+4)^2 = 17

    asked by YOSHI
  6. Math

    A rooming house has three rooms that contains four beds, three beds and two beds respectively. In how many ways can nine quests be assigned to these rooms? The book says it is 1260. I have no idea how they got this. I know it requires combinations. Could

    asked by David
  7. physics

    A particular tower clock similar to Big Ben has an hour hand 2.70 m long with a mass of 62.0 kg, and a minute hand 4.80 m long with a mass of 100 kg. Calculate the total rotational kinetic energy of the two hands about the axis of rotation. (You may model

    asked by mary
  8. math help!

    A lottery game asks you to pick 5 numbers from the set 1, 2, 3, ... , 29, 30. How many ways are there to play this lottery game? (Assume that this is a game where the order of your picks does NOT matter.) A) 27,405 B) 84,825 C) 593,775 D) 142,506

    asked by BreAnna
  9. Math

    The length of time (T) in seconds it takes the pendulum of a clock to swing through one complete cycle is givenby the formula T=2pi square root of L divided by 32 where L is the length in feet, of the pendulum, and pi is approximately 22 divided by 7. How

    asked by Carolyn
  10. chem

    Hydrogen and carbon dioxide react at a high temperature to give water and carbon monoxide. H2(g) + CO2(g) --> H2O(g) + CO(g) (a) Laboratory measurements at 986°C show that there are 0.11 mol each of CO and H2O vapor and 0.087 mol each of H2 and CO2 at

    asked by Rachel
  11. physics

    Challenger Deep in the Marianas Trench of the Pacific Ocean is the deepest known spot in the Earth's oceans, at 10.922 km below sea level. Taking density of seawater at atmospheric pressure (p0 = 101.3 kPa) to be 1024 kg/m3 and its bulk modulus to be B(p)

    asked by HELP!!!!
  12. Physics

    A 1200 wrecking ball hangs from a 20 -long cable. The ball is pulled back until the cable makes an angle of 30.0 with the vertical.By how much has the gravitational potential energy of the ball changed?

    asked by Mike aloe
  13. chemistry

    How much hydrogen gas (H2) forms when 54 g of aluminum reacts with excess HCI ?

    asked by Ed
  14. english

    The following phrases are bullet points in a letter. Which one is not in parallel form? A. Increase sales support staff B. Run market test with Group A C. Decrease overhead D. Don't forget marketing plan

    asked by Anonymous
  15. Chemistry

    An equilibrium mixture of SO2, O2, and SO3 at 1000 K contains the gases at the following concentrations: [SO2] = 3.77 10-3 mol/L, [O2] = 4.30 10-3 mol/L, and [SO3] = 4.13 10-3 mol/L. Calculate the equilibrium constant, K, for the following reaction. 2

    asked by Rachel
  16. Geometry

    A cube has edge lengths of 6 inches. What is the approximate length of a diagonal "d" of the cube? A)6 in. B)8.4 in. C)10.4 in. D)12 in.

    asked by Sergio
  17. Chemistry

    Acetylene (C2H2) and hydrogen fluoride (HF) react to give difluoroethane: C2H2+2HF->C2H4F2 When 2.3 mol of C2H2 and 12 mol HF are reacted in a 15.4 L flask, what will be the pressure in the flask at 13°C when the reaction is complete? I know I'm supposed

    asked by Dewey
  18. physics

    A 15-kg chandelier is suspended from the ceiling by four vertical steel wires. Each wire has an unloaded length of 5 m and a diameter of 6 mm, and each bears an equal load. When the chandelier is hung, how far do the wires stretch? (The Young's modulus for

    asked by Anonymous
  19. trig

    Peter (P) and Jamie(J) have computer factories that are 132 miles apart. They both ship their completed parts to Diane (D). Diane is 72 miles from Peter and 84 miles from Jamie. Using the points D,J,and P to form a triangle, find m

    asked by John
  20. American Lit project help (Literature needed)

    So for my amer lit class I am doing a project on American foods in the 1950s and I need a piece of literature to write my essay on. It has to be a short peice not a novel. I really wanted for my literature to be a magazine from the 1950s. Like better homes

    asked by Sarah
  21. PHYSICS thankyou in advance...

    A cake of soap placed in a bathtub of water sinks. The buoyant force on the soap is: a- Zero b- Less than its weight c- Equal to its weight d- More than its weight I believe is D for if the cake of soap sinks, it means that the specific gravity is more

    asked by DMITRIC
  22. Math 123

    Gail received a 7% raise last year. If her salery is now $27,285 what was her salery last year?

    asked by Yenny
  23. math help pls!

    A lottery is set up in which players pick six numbers from the set 1, 2, 3, ... , 39, 40. How many different ways are there to play this lottery? (In this game the order in which the numbers are picked does NOT matter.)

    asked by BreAnna
  24. Economic Equity/ Economic Security

    Could you please explain to me what these terms mean in simplified terms. I already searched them up on net, and their definitions are complicated for me to understand.

    asked by Anonymous
  25. PRECALCULUS

    convert the polar equation to rectangular form. 1.) r sec(theta) = 3 2.) r = 4 cos(theta) - 4 sin(theta) convert from rectangular equation to polar form. 1.) x^2 + (y-1)^2 = 1 2.) (x-1)^2 + (y+4)^2 = 17

    asked by YOSHI
  26. calculus

    The length of a rectangle is decreasing at the rate of 2 cm/sec, while the width w is increasing at the rate of 3 cm/sec. At what rate are the lengths of the diagonals changing at the instant that l=15 cm and w= 8 cm? Are the diagonals increasing or

    asked by Janet
  27. Chemistry

    Using standard reduction potentials, calculate the standard E¡Æcell, emf, for each of the following reactions. State if each reaction is spontaneous or nonspontaneous. (Use the below reactions AS WRITTEN, DO NOT REARRANGE ANY REACTIONS.) You must show

    asked by Anna
  28. Chemistry

    How do I calculate the solubility of a compound in grams of solute per 100 grams of solution?

    asked by Matt
  29. chem

    An equilibrium mixture of the following reaction was found to have [COF2] = 0.255 M and [CF4] = 0.118 M at 1000°C. What is the concentration of CO2? 2 COF2(g) CO2(g) + CF4(g) Keq = 2.00 at 1000°C Thanks:)

    asked by Rebekah
  30. chem- acids and bases

    sorry to take up your time again, acids and bases just really confuse me, i'd really appreciate your help again. "What is the pH at the end point for the titration of 0.20M HNO2 by 0.20M NaOH? Ka nitrous acid= 4.5 x 10^-4." this is what i do know: - end

    asked by marie
  31. english

    fill in the blanks with appropriate (suitable)determiners 1.he did seem to have read----scriptures.

    asked by mayank
  32. physics

    A fountain sends water to a height of 116 m. What is the difference between the pressure of the water just before it is released upward and the atmospheric pressure? (The density of water is 1000 kg/m2.)

    asked by HELP!!!!
  33. Statistics

    Tuyns et al. (1977) carried out a case-control study of esophageal cancer in the region known as Ille-et-Vilaine in Brittany, France. The referring data set is oesoph_new.dta, and use logistic regression models to answer each of the following questions.

    asked by Lyn
  34. physics

    Three objects -- two of mass m and one of mass M -- are located at three corners of a square of edge length l. Find the gravitational field g at the fourth corner due to these objects. (Express your answers in terms of the edge length l, the masses m and

    asked by mary
  35. Chemistry Please help!!

    An electrochemical cell that uses the reaction Ti^3+ + 2Cr^2+ -> Ti^1+ + 2Cr^3+ Has a standard cell potential of E¢ªcell = +1.19V a. Write the two half-cell reactions. b. Determine the E¢ªred(reduction).

    asked by Anna
  36. chemistry

    A helium atom weighs 6.65 X 10 to the negative 24 grams. How many helium atoms are contained in a 1.0 g sample?

    asked by Lindsey
  37. English

    1. I think watching TV is bad because we cannot study effectively. 2. I think watching TV is bad because we can become violent as we watch violence movies. 3. I think watching TV is not so good because we have many things to do. We should not waste time

    asked by rfvv
  38. science

    A heavy particle is placed at the top of a vertical hoop.Calculate the reaction of the hoop on the particle and the height at which the particle falls off.

    asked by dharm
  39. L.A.

    Im doing a biography on Rick Riordan but I can't find some of his family information. Does Rick Riordan have any siblings? If so, what are their names? Also, what are Riordan's parents' names?

    asked by volleyball_lovr
  40. math algebra 2

    polynomial complete the table for -7x^4+8x^3-3x^2+5x-9 not sure if this is correct sorry I did not post my answer to check to see if they were correct. term -7x^4 8x^3 3x^2 5x -9 coefficient -4 8 3 5 8 degree of term 4 3 2 1 0 degree of polynomial 7? -7x^4

    asked by Anonymous
  41. chem

    what is the pH change after the addition of 10mL of 1.0M sodium hydroxide to 90mL of a 1.0M NH3/1.0M NH4^+ buffer? Kb ammonia= 1.8 x 10^-5 i found the pH for the original buffer to be 9.255, but i'm not sure how to go about the rest of the question,

    asked by marie
  42. Math, statistics, Linear Programming

    just looking for the constraints and variables. The Nestle’ Purina PetCare Company of St. Louis, Missouri, manufactures a gourmet cat food under the Fancy Feast brand. The brand includes a number of options for choices of meats, fish, and poultry in

    asked by ralph
  43. algebra

    how do you find the square root of any number with long division and not a calculator? I don't like calculator readings. They are not always easy to figure out, plus math principles can't be learned with a calculator.

    asked by Aria
  44. physics

    a satellite makes 10 revolutions per day around the earth.find its distance from the surface of the earth.

    asked by Sayali
  45. Chemistry

    If 237 mL of O2, measured at STP, are obtained by the decomposition of the KClO3 in a 5.44 g mixture of KCl and KClO3, 2KClO3(s)-->2KCl(s)+3O2(g) what is the percent by mass of KClO3 in the mixture?

    asked by Sam
  46. Math

    Three blue and five red balloons are each tied to a string and the strings are held together. If one of the strings is selected at random, determine the odds in favor of the balloon being red.

    asked by Valerie
  47. Chemistry

    Metal cations can act as lewis acids in water to produce an acidic solution even though the metal ion contains no hydrogen. Water hydrates the ions in solution and partial loss of electrons from water allows hydrogen ion to be lost What is the pH of a

    asked by Jude
  48. Chemistry

    A buffer was made by mixing 0.1522 moles of HCO2H with 0.1832 moles LiHCO2- and diluting to exactly 1L. What will be the pH after addition of 10ml of 0.3657M NaOH to 50mL of the buffer. Ka(HCO2H) = 1.8*10-4

    asked by Jude
  49. English

    1. See the X on the map? 2. Do you se the X on the map? (Does #1 mean #2?) 3. Is anyone in your family a caregiver to sick people? (Is this a correct sentence?) 4. The girl is well grounded in French. (Is this correct? Would you paraphrase this one with

    asked by rfvv
  50. geometry

    Using the following values, calculate the amount accumulated (future value): Initial Principal = $9000 Interest Rate = 8% Number of years = 9 Monthly Compounding

    asked by mike...
  51. English

    I forgot to add the following sentences. Thank you very much for the cooperation. 1) They can remember details such as the criminal's hairstyle, tattoos or scars. 2) The best method to catch a criminal is the DNA identification. Robots can provide

    asked by Mike1
  52. Physics (please help!!!!)

    A box with a volume V = 0.04 m3 lies at the bottom of a lake whose water has a density of 103 kg/m3. (a) How much force is required to lift the box, if the mass of the box is 1050 kg? (b) How much force is required to lift the box, if the mass of the box

    asked by Anonymous
  53. Chemistry- Please help!!

    Using standard reduction potentials, calculate the standard E¡Æcell, emf, for each of the following reactions. State if each reaction is spontaneous or nonspontaneous. (Use the below reactions AS WRITTEN, DO NOT REARRANGE ANY REACTIONS.) You must show

    asked by Anna
  54. physics

    I have a couple physics questions I need help with please! If you could show me step-by-step directions, I'd really appreciate it! A boat with a horizontal tow rope pulls a water skier. She skis off to the side, so the rope makes an angle of 15.0 degrees

    asked by physicsclass
  55. algebra

    A Science instrutor assigns his student one second of home work..the first week of school,two seconds. the second week four seconds, the third.if the student asked whether he would agree to this weekly homework doubling for the duration of the 36-week

    asked by MIKE11
  56. physics

    A tank of height H is filled with water and sits on the ground, as shown in the figure. Water squirts from a hole at a height y above the ground and has a range R. For two y values, 0 and H, R is zero. Determine the value of y for which the range will be a

    asked by HELP!!!!HELP!!!!
  57. english

    Education in financial planning had opened (past perfect tense) my eyes to better money management. Financial planning education will be teaching (future progressive tense) me better money saving strategies. The role of education will play (simple future

    asked by Com 155
  58. GMAT Essay- Analysis of issue

    Please grade my essay on 6 Topic “Parents should not shoulder the full burden of their children’s college tuition. If university students are required to pay for at least a portion of their education, they will take their studies more seriously and,

    asked by Steven
  59. English

    This morning, Jinsu sent a text message to some of his friends. It said Park Jisung is coming to our school. The news became widespread, so many students gathered on the playground to see Park Jisung, the famous soccer player. They were excited to see him.

    asked by rfvv
  60. PHYSICS

    The input piston of a hydraulic press is 20mm in diameter, and the output piston is 10mm in diameter. an input force of 1.0N will produce an output force of: a- 0.25N b- 0.50N c- 2.0N D- 4.0N

    asked by DMITRIC
  61. math!

    1) A lottery is set up in which players pick six numbers from the set 1, 2, 3, ... , 39, 40. How many different ways are there to play this lottery? (In this game the order in which the numbers are picked does NOT matter.) 2) A club of 15 students will

    asked by BreAnna
  62. english

    Hi, I am writing 6 pages about these questions please me help to understand them so that I can start writing them, thanks! 1)What is political racism, What is institutional racism? Why is Reverse Racism in the U.S. a myth, How does racialisation work? How

    asked by Lisa
  63. math

    How high is a flagpole that casts a 42-ft at the same time that 5 1/2- ft women casts a 7 ft shadow

    asked by briana
  64. Math 123

    carolyn borowed $125 if the interest rate is 1.5% per month on the unpaid balance and she does not pay this debt for 1yr how much interest will she owe at the end of the year

    asked by Yenny
  65. PHYSICS

    The input piston of a hydraulic press is 20mm in diameter, and the output piston is 10mm in diameter. an input force of 1.0N will produce an output force of: a- 0.25N b- 0.50N c- 2.0N D- 4.0N

    asked by DMITRIC
  66. physics

    A racquetball with a diameter of 5.6 cm and a mass of 42 g is cut in half to make a boat for American pennies made after 1982. The mass and volume of an American penny made after 1982 are 2.5 g and 0.36 cm3. How many pennies can be placed in the

    asked by HELP!!!!
  67. Chemistry

    A 69.4 L cylinder containing C2H6 at a pressure of 570 torr is connected by a valve to 105 L cylinder containing C6H6 at 0.350 atm pressure. Calculate the partial pressure (atm) of C6H6 when the valve is opened.

    asked by itsliferight
  68. algebra

    1.Graph the function f(x) = (x + 3)3 by hand and describe the end behavior

    asked by Anonymous
  69. human resources

    Castle’s Family Restaurant has eight restaurants in the Northern California area with approximately 300-340 employees. Most of the employees work part time, with approximately 40% full time. The operations manager, Jay Morgan, also acts as the HR manager

    asked by Rich
  70. physics

    A ball of circumference 74.2 cm and mass 605 g is forced to the bottom of a swimming pool and then released. After initially accelerating upward, it rises at a constant velocity. (The density of water is 103 kg/m3.) (a) Calculate the buoyant force on the

    asked by HELP!!!!
  71. Chemistry-Plz see this DrBob

    I am sorry I do not know what happens the symbolism, so I just deleted the symbols. Is it works for you that deleted the symbols? Using standard reduction potentials, calculate the standard Ecell, emf, for each of the following reactions. State if each

    asked by Anna
  72. Chemistry

    How many moles of NaOBr- must be mixed with 0.1788 mole of HOBr and diluted to 1L to prepare a solution having a pH of 8.7043. Ka of HOBr = 2.0 * 10-9

    asked by Jude
  73. Chemistry

    Calculate the[OH-] of a solution of 0.1861M CH3CH2CH2NH3CL if Kb= 5.1*10-4 for CH3CH2CH2NH2

    asked by Jude
  74. geometry

    A Science instrutor assigns his student one second of home work..the first week of school,two seconds. the second week four seconds, the third.if the student asked whether he would agree to this weekly homework doubling for the duration of the 36-week

    asked by MIKE11
  75. math

    Annual profit in thousands of dollars is given by the function, P(x) = -.01x2 + 50x + 30,000, where x is the number of items sold, x ¡Ý 0. 1.describe the meaning of the number -.01 in the formula

    asked by bobby
  76. MAth

    50=3(s = 16)- 2(s - 2) I tried 3s+2s - 48-4 = 50 5s - 44 -44 = 50 - 44 am I on the right track ???

    asked by Caroline
  77. MAth

    5(2x - 10)/2 + 14 = 19 Tried working this, need help-please 5x-50/2 or 10x - 50/2

    asked by Caroline
  78. statistics

    A researcher theorized that people can hear better when they have just eaten a large meal. Six individuals were randomly assigned to eat either a large meal or a small meal. After eating the meal, their hearing was tested. The hearing ability scores (high

    asked by unk
  79. Discrete Math

    Let A={0,1,2,3,4}. Define a function f from A to A by f(n)=2n mod 5. a/ Is f one-to-one? b/ Is f onto? Could you show me how to solve this problem, please? I have no idea what this function is. Your help is greatly appreciated.

    asked by yengiang
  80. Economics

    Gear strategy has managed to improve the livelihood of the poor in south africa

    asked by Kagiso
  81. Math

    An empty sandbox has a length of 6 feet width of 4 feet and a depth of 2 feet. If the sandbox is filled with 8 bags of sand and each bag contains 4.5 cubic feet of sand, what fraction of the sandbox is still empty?

    asked by Helpplz
  82. english

    fill in the blanks with appropriate (suitable)determiners 1.he did seem to have read----scriptures. 2.as----youth i had to work harder.

    asked by mayank
  83. science

    i don't know how to solve this. looked through all my note but i'm not sure what kind of formula i am to use or if i even need one! please help me to understand this: "calculate the work need to make room for the products in the combustion of S8(s) to

    asked by marie
  84. statistics

    a simple random sample will be obtained from a normally distributed population. find the minimum sample size needed to be 95% confident that the sample standard deviation (s) is within 10% of sigma. please help!

    asked by lucy
  85. roll dice

    Event A you roll the die and it's even Event B you roll the die and it's less than 5 Roll the die once. What is the probability that Event A will occur given that Event B has alrady occured? would it be 3/4 = .75 or 75% not sure need help and, Roll the die

    asked by sonney32
  86. math

    Exactly how many cubic inches of air can a fully inflated basketball hold if its radius is 4.2 inches?

    asked by a hall
  87. finance

    Shamroll inc. is a household products frim that is considering developing a new detergent. In evaluationg whether to go ahead with the new detergent project, which of the following statements is most correct? A) The company will produce the detergent in a

    asked by savin1
  88. chem

    topic: thermochemistry i'm not really sure how to go about his question. i'm not sure with formula to use. (perhaps Cspht= q/(m x deltaT)?)can you please help me step by step or give me a hint and i'll post my answer, pretty please? "250g of hot coffee at

    asked by marie
  89. physics

    A supertanker filled with oil has a total mass of 1.09 109 kg. If the dimensions of the ship are those of a rectangular box 260 m long, 78 m wide, and 78 m high, determine how far the bottom of the ship is below sea level (ρsea = 1020 kg/m3).

    asked by Anonymous
  90. Physics (please help!!!!)

    Blood pressure is usually reported in millimeters of mercury (mmHg) or the height of a column of mercury producing the same pressure value. Typical values for an adult human are 130/80; the first value is the systolic pressure, during the contraction of

    asked by Anonymous
  91. Social Studies

    I have to conduct an interview with Samuel F. B. Morse and I need help.

    asked by Marduida
  92. architecture

    the best way to describe classical Greek art would (paragraph) example would include the statue

    asked by david
  93. physics

    A square pool with 100-m-long sides is created in a concrete parking lot. The walls are concrete 87 cm thick and have a density of 2.5 g/cm3. The coefficient of static friction between the walls and the parking lot is 0.42. What is the maximum possible

    asked by please help!!!!
  94. Physics

    Suppose that you are standing on a cardboard carton that just barely supports you.What would happen to it if you jumped up into the air? It would spring upward a bit. It would move sideways. It would be unaffected. It would collapse.

    asked by Emma
  95. Math

    Simplify I came up with 5.5 (15x^5-21x^4+21x^2)/(3x^2 ) not sure if I did this the correct way it just doesn't seem right at all.

    asked by please help me
  96. Chemistry

    Find the mass of oxygen gas needed to react with 0.2 moles magnesium and the mass of the product? Working out please

    asked by Babiinoob
  97. Analysis of Argument

    Question: “According to a recent study, professional bodybuilders who used Train & Gain, a new protein supplement, over the course of three months experienced an increase in measured strength of up to 20%. Since Train & Gain is now available without

    asked by Steven
  98. algebra

    what is the easiest way to solve a square root equation without a calculator? I have looked online and found a few, but to get the lengthy decimals or irrational numbers seems awfully confusing.

    asked by aria
  99. Statistics

    Decide whether the experiment is a binomial, Poisson, or neither based on the information given. Each week a man plays a game in which he has a 21% chance of winning the random variable is the number of times he wins in 64 weeks.

    asked by glo
  100. Health

    What is the Drug Classification of Anabolic Steroids?

    asked by Mike
  101. English

    There are a few sentences I can't make sense of. Can you please help me. Thank you very much in advance. 1) Together with interviewing witnesses their job (the job of forensic artists) shouldn't be so long and the criminal could be discovered fast. 2) This

    asked by Mike1
  102. chemistry

    What is the molarity (mol/L) of sodium (Na) in a solution containing 0.4 mole ofNa + cation in 400 mL of an aqueous (water) solution?

    asked by Ed
  103. Philosophy and Religion

    I need to write a 700 word summary about any Hinduism god?

    asked by Tara Brown
  104. math algebra 2

    polynomial complete the table for -7x^4+8x^3-3x^2+5x-9 some please help me complete this table I beg of you

    asked by Anonymous
  105. math

    if V = (10x-10y)i + 30k find pressure change between points (0,0,0) and (3,1,0)

    asked by Anonymous
  106. physics

    if V = (10x-10y)i + 30k find pressure change between points (0,0,0) and (3,1,0)

    asked by Anonymous
  107. physics

    A child loses his balloon, which rises slowly into the sky. If the balloon is 17 cm in diameter when the child loses it, what is its diameter at the following altitudes? Assume that the balloon is very flexible and so surface tension can be neglected. (a)

    asked by Anonymous
  108. Physics (please help!!!!)

    A man of mass 80 kg and density 970 kg/m3 stands in a shallow pool with 31% of the volume of his body below water. Calculate the normal force the bottom of the pool exerts on his feet. (Take the positive direction to be up. Indicate the direction with the

    asked by HELP!!!!
  109. Instrumental Chem Lab

    I am working on a HPLC lab where we are to determine the concentration of caffeine in two energy drinks. I am trying to figure out the concentrations but don't think I am doing it right. Below is the info from our chromatograms: Standard Caffeine peak area

    asked by Wheaties
  110. geometry

    an isosceles trapesiod has legs that measure 24 units each. If the perimeter of the trapeziod is 150 units, what is the legth of its median?.

    asked by natalie
  111. English

    Can you please check these sentences? I'm still doubtful about the use of prepositions. Thank you very much. 1) I was last ashamed of myself when I lost all the matches in a tennis tournment (The last time I've been ashamed of myself is wrong?) 2) I've

    asked by Mike1
  112. physics

    A square pool with 100-m-long sides is created in a concrete parking lot. The walls are concrete 87 cm thick and have a density of 2.5 g/cm3. The coefficient of static friction between the walls and the parking lot is 0.42. What is the maximum possible

    asked by please help!!!!
  113. English

    I forgot to include these last sentences. Thank you very much for the help. 1) I’m ashamed of myself when my teacher reprimands my in the class register. (writes me a reprimand?). I felt ashamed of myself when I first talked to my girlfriend because I

    asked by Mike1
  114. Math

    How many pounds of pressure does a 25 pound baby weigh in a head on collision when the car is traveling at 25 miles per hour. (and hits a stationary object) The assignment is to research car crash scenarios but I don't know a formula to figure this out.

    asked by Ann
  115. scienceeeeeeeeeeeeeeeeeeeeeeeeeeeee

    why the skin cells of an adult must divide? is it because they are in the direct contact with the things from the outside world. they have to replace the new skin cell from the dead cell

    asked by kim
  116. physics

    Three objects -- two of mass m and one of mass M -- are located at three corners of a square of edge length l. Find the gravitational field g at the fourth corner due to these objects. (Express your answers in terms of the edge length l, the masses m and

    asked by mary
  117. College Help

    I am a Sophomore in High School. I have a GPA of 3.3 currently, (it's very bad) with no AP classes taken until Junior and Senior year. What are my chances of getting into UC Irvine? That's the school I really want to get into!

    asked by William
  118. chem

    i don't know how to solve this. looked through all my note but i'm not sure what kind of formula i am to use or if i even need one! please help me to understand this: "calculate the work need to make room for the products in the combustion of S8(s) to

    asked by marie
  119. Japanese

    I am trying to describe my cat, but what does zurukashiroi mean?

    asked by Caity
  120. Social Studies

    I have to do an assignment for SOSE. I have to do a Medieval Webquest on Medieval women. But I have no idea how to do it, I have a sheet but I don't understand it. Please help me. Thanx, Caity.

    asked by Caity
  121. scientist

    what is ensebles?

    asked by dharm
  122. Language Arts

    ....Poets, whoknow how to express so many beautiful things, are some of the most miserable people on the planet... Why is this Ironic?

    asked by Stacey
  123. physic

    I have a number of questions. please answer as many possible according your expertise. 1. i have seen for sale fossils of ginger and garlic in an antiquity shop. they look like ginger/garlic but is rock hard. the price is about $8 each, which seems like to

    asked by ain
  124. Science

    true or false ___ fluids exert pressure in all directions. ___ the faster fluids move, the more pressure they exert.

    asked by Roy S.
  125. science

    an ionic compound that attracts atmospheric water that a hydrate is found is said to be non-volatile . is this statement is correct or not???

    asked by shipra
  126. science

    why do doctors advice gargles by saline water in case of throat infection???

    asked by shipra
  127. math help pls!

    16! _____ 5!* 11!

    asked by BreAnna
  128. math

    P(8, 5) =

    asked by BreAnna
  129. English

    Thank you very much. Here are some more sentences I'm not sure of. 1) DNA can’t be changed since each (every also possible) person/each of us/ has a different DNA (?). 2) Using (by using) this method forensic artists can convict thousands of criminals

    asked by Mike1
  130. L.o

    10 to 15 lines

    asked by Zandile
  131. statistics

    On a standard 52 card deck, calculate the probability. that on card is either a queen or a heart draw one card, what is the probability that it is a king, given that it is a club? Thanks

    asked by sonney32
  132. Sociology

    How can I explain the different choices males and females make when they get their tattoos and body piercings?

    asked by Alex L.
  133. maths

    5/6 of number is 42. what is the number?

    asked by Anonymous
  134. math

    2. For which value(s) of a does the system of equations (a-3)x+y=0 x+(a-3)y=0 have non-trivial solutions

    asked by muna
  135. PSYCH

    Analytical Psychological Theory Assumptions, Reliability,Validity,and Application

    asked by SINBAD
  136. human sevices

    proposal for presentation on a technique for creating behavior change

    asked by wendy
  137. math

    Show that 1/ρ D_ρ/D_t = □(→┬∇ ) . □(→┬V )

    asked by Anonymous
  138. chem

    what will the pH at the end point of 0.0812M Ba(OH)2 be when titrated with HCl? a) 9.0 b) 8.0 c) 12.2 d) 7.0 e) 6.0 for this question, can i just assume the pH will be 7 since it's s titration with a strong base and a strong acid? (or do i have to do

    asked by marie
  139. English

    Thank you very much for your help. I have some more sentences I'm not sure of. 1) I've been proud of myself when I won the regional competition of judo. I’ve been proud on 24 July when I passed my driving test. Can you say “when I got the highest grade

    asked by Mike1
  140. week 7 math 116 checkpoint

    totally lost need help

    asked by Gracie
  141. biology

    In every energy transactions, some of the energy is also lost as heat.

    asked by clarissa
  142. Economics - Cost benefit analysis

    Imagine that there are two cohorts of 100 patients each. One group got the flu vaccine and other group did not. Outcomes Vaccine Group Outcomes = 90 patients without the flu No-Vaccine Group Outcomes = 50 without the flu Costs Vaccine Group Costs = $100

    asked by Hung
  143. geometry

    a point is placed on a two dimensional grid at some distance away from another point. The newly addes point is 95 degrees away from the original point. now describe the location

    asked by Teresa
  144. english

    Education in financial planning teaches (simple present tense) me how to save money for my children’s college education. Could someone tell me if this is correct?

    asked by Help
  145. Language Arts

    Skiing was canceled on account of snow. Why is this Ironic?

    asked by Stacey
  146. physic

    I have a number of questions. please answer as many possible according your expertise. 1. i have seen for sale fossils of ginger and garlic in an antiquity shop. they look like ginger/garlic but is rock hard. the price is about $8 each, which seems like to

    asked by ain
  147. Science

    fluids are substances that can flow, include ________ and ________ and will flow from areas of low pressure to high pressure.

    asked by Roy S.
  148. science

    what are some positve things about cane toads

    asked by pete
  149. English

    Can you please help me check these sentences. Thank you for your help 1)Robotic planes are useful because they can fit in small places where humans cannot enter and scan areas to find possible survivors. 2) They are quick and small so they can manage to

    asked by Mike1
  150. science

    What is another word for exothermic?

    asked by Michelle
  151. English

    1. He took a flight to his hometown. (What does 'flight' mean here? Does 'flight' mean 'airplane'?) 2. Your childish games don't amuse me one bit. (What other expressions can we use instead of 'one bit'?) 3. Jane can dance with skill. 4. Jane can dance

    asked by rfvv
  152. organic chemistry

    plz tell me about natureof bonding and forces ,heat of hydrogen,anti bandister bonding electrons.primary bond,secondary bond and tertiary bond

    asked by naila
  153. history

    how did john adams feel about the behaviors of son of liberty?

    asked by vivian
  154. Algebra needs help

    1/2^(-x)=3 then how is 4^(x+2)?

    asked by lisa
  155. Business Management

    I need help with a paper on Functions of management. describing the FOUR FUNTIONS OF MANAGEMENT, DESCRIBING MY MANUFACTURING OPTIONS.

    asked by Simona
  156. american history

    i need to come up with a dialogue using 5 slang words from the 1920s

    asked by shybruney all