1. Calculus

    A popular search engine is targeting European countries where the number of online households is expected to grow at a steady rate. Data was taken over time, and it was found that the number of online houses (in millions) projected can be modeled by the

    asked by Wiz on April 17, 2013
  2. Calculus

    A popular search engine is targeting European countries where the number of online households is expected to grow at a steady rate. Data was taken over time, and it was found that the number of online houses (in millions) projected can be modeled by the

    asked by Deeno on April 17, 2013
  3. physics

    Derive a general equation for the time of flight of the banana en route to the monkey in terms of only the velocity, distance, and height hint: if you are doing everything right, there should be a lot of cancellations resulting in a relatively simple

    asked by Spice on October 25, 2015
  4. Calculus

    A popular search engine is targeting European countries where the number of online households is expected to grow at a steady rate. Data was taken over time, and it was found that the number of online houses (in millions) projected can be modeled by the

    asked by Wiz on April 16, 2013
  5. Math

    48000 people voted in the last election in the town of Southboro. If only 55% of the registered voters voted in the last election, how many people are registered to vote? I got 87,273 Nik put $264 in a savings account that pays 3% annual interest. How much

    asked by Mary on February 25, 2013
  6. Math

    48000 people voted in the last election in the town of Southboro. If only 55% of the registered voters voted in the last election, how many people are registered to vote? I got 87,273 Nik put $264 in a savings account that pays 3% annual interest. How much

    asked by Mary on February 25, 2013
  7. Heath

    1. Which digestive organ is the last organ food passes through before reaching your stomach? (1 point) pharynx epiglottis esophagus mouth 2. Starches and sugars belong to which class of nutrients? (1 point) carbohydrates fats proteins enzymes 3. A method

    asked by Help on November 11, 2016
  8. Math

    Problem: Tad draws three cards at random, without replacement, from a deck of ten cards numbered 1 through 10. What is the probability that no two of the cards drawn have numbers that differ by 1? Express your answer as a common fraction. Scott's solution:

    asked by Nikhil on February 20, 2017
  9. psy- please revise

    Biomedical and psychotherapy are two basic approaches to treating psychological disorders. A number of approaches fall under the category of psychotherapy, but they all include the following four essential characteristics: 1. systematic interaction between

    asked by rose - Ms. Sue on May 29, 2008
  10. Chemistry

    What will be the vapor pressure at 25 degree C of a 30.0% (by mass) solution of glucose, C6H12O6 (a non-electrolyte-molar mass = 180 g/mol), in water? The vapor pressure of water at 25 degree C is 23.8 mm Hg. Psolvent = XsolventPosolvent. You will need to

    asked by AndrewN. on January 31, 2007
  11. Chemistry

    1.) Hydrogen fluoride (HF) is a weak acid, which when dissolved in water reacts slightly by the equation: HF(g) + H2O(l) = H3O^+(aq) + F^-(aq). Predict the direction of shift of the equilibrium that occurs if some NaOH is added to the solution. Explain -My

    asked by Amy on November 12, 2012
  12. Physics

    A 1900kg car starts from rest and drives around a flat 56-m-diameter circular track. The forward force provided by the car's drive wheels is a constant 1000N. a. What is the magnitude of the car's acceleration at t=13s? b. What is the direction of the

    asked by Kay on March 9, 2010
  13. English

    Thank you. I really need you to check this paragraph I prepared for a listening. 1) Bamboo fibre has a round surface which makes it soft and smooth. In contrast, petrol-based synthetic fibres cause skin irritation and in some cases a rash. 2) Another

    asked by Henry2 on October 12, 2011
  14. math-volume

    I'm confused with how to solve this problem, so help would be great! The volume of any spherical balloon can be found by using the formula V= 4/3 pi r^3. Write an equation for r in terms of V and pi All this is asking you to do is get r=something. First, I

    asked by julie on January 21, 2007
  15. algebra

    1)Solve by factoring:5x^2=4-19x answer=-4,1/5 2)Which quadratic equation has roots 7 and -2/3? answer=A A.2x^2-11x-21=0 B.3x^2-19x-14=0 C.3x^2+23x+14=0 D.2x^2+11x-21=0 3)To solve 4x^2-28x+49=25 by using the square root property,you would first rewrite the

    asked by Marissa on August 14, 2007
  16. Physics

    A circuit employs a silicon solar cell to detect flashes of light lasting 0.25 s. The smallest current the circuit can detect reliably is 0.32 μA . Assuming that all photons reaching the solar cell give their energy to a charge carrier, what is the

    asked by Joshua on May 6, 2016
  17. English

    I need to rephrase (using indirect speech) what 4 people said is important when preparing to go for an interview. Could you please help me? 1)Speaker 1 recommends one should make a short list of the job’s requirement (or requirement for/in the job

    asked by Henry2 on February 10, 2012
  18. chemistry

    *This is part of an exam. so please don't give full solution* just trying to bump ahead of a block. The decomposition of NO2 at room temperature exhibits the following variation in concentration with time: The concentration of NO2 is expressed in

    asked by 3.091x on July 26, 2014
  19. RE: phhysics

    Posted by Charlene on Friday, March 23, 2007 at 3:00am. picture in your mind a block that slides without friction down a ramp that is inclined at an angle (q) above the horizontal. Initially the block is at rest a distance (s) in meters (measured along the

    asked by Charlene on March 23, 2007
  20. Chemistry

    The freezing point of benzene is 5.5°C. What is the freezing point of a solution of 8.50 g of naphthalene (C10H8) in 425 g of benzene (Kf of benzene = 4.90°C/m)? I worked this problem for someone just a couple of days ago. delta T = kf m kf = 4.90 m =

    asked by Kelly on January 24, 2007
  21. science

    why do rabbits keep turning thier ig,sound-collecting ears? compare and contrast the information of an evaporite rock to one of detrital origin. The change in loudness with the rotation can serve to locate the direction of the source of the sound. I hope

    asked by sam on June 5, 2007
  22. Calculus

    My teacher wants me to use this formula for half life question C(t) = Ce^-kt but i used a different formula plz help. the question is: A radioactive isotope has a half life of 30 years. If we started off with 10 mg of this isotope 12 years ago: a) Find and

    asked by max on July 26, 2015
  23. Science

    Which solution will best allow the movers to achieve their goal? A) Change the width of the ramp from 4 meters to 3 meters. B) Change the length of the ramp from 4 meters to 5 meters. C) Change the height of the ramp from 3 meters to 4 meters. D) Change

    asked by Marc on March 3, 2016
  24. programming logic

    The Banking e-Teller system allows bank customers to perform ATM transactions from their cell or smart phones. BET will allow customers to check balances, make remote photo capture check deposits, and perform balance transfers to their checking or savings

    asked by david on January 22, 2013
  25. Chem

    A dilute aqueous solution of Na2SO4 is electrolyzed between Pt electrodes for 3.70 h with a current of 2.77 A . Part A What volume of gas, saturated with water vapor at 25∘C and at a total pressure of 742 mmHg , would be collected at the anode? The vapor

    asked by A on March 31, 2018
  26. Physics

    A rubber ball (mass 0.30 kg) is dropped from a height of 2.0 m onto the floor. Just after bouncing from the floor, the ball has a speed of 3.9 m/s. (a) What is the magnitude and direction of the impulse imparted by the floor to the ball? MAGNITUDE: 3.05 kg

    asked by Audrey on November 7, 2012
  27. English

    1. Read the following passage from "The Cabuliwallah." I took them and was going to pay him, but he caught my hand and said: "you are very kind, sir! Keep me in your recollection; do not offer me money! You have a little girl; I too have one like her in my

    asked by JayStudy on May 12, 2017
  28. chemistry

    a 1.009g mixture of the solid salts Na2SO4 and forms an aqueous solution with the precipitation of PbSO4. The precipitate was filtered and dried and its mass was determined to be .471 g. the limiting reactant was determined to be Na2SO4. Write the

    asked by Ann on March 23, 2010
  29. Math

    What is 0.68 written as a simplified fraction? My answer is 17/25. What makes the statement true? 7^-2= My answer is 14. What is 308,745,538 is scientific notation? My answer is 3.1 x 10^8. What is the solution to (3 x 10^2) x (5 x 10^5)written in

    asked by El on October 13, 2015
  30. chemistry

    Hy Dr Bob222 this will be the last time I will bother you about this type of question. Can you please tell what I am doing wrong? This is the best answer I could come up with: Question: Strychnine, C21H22N2O2(aq) is a weak base but a powerful poison.

    asked by Kelsy on April 8, 2008
  31. Algebra

    What is 0.68 written as a simplified fraction? My answer is 17/25. What makes the statement true? 7^-2= My answer is 14. What is 308,745,538 is scientific notation? My answer is 3.1 x 10^8. What is the solution to (3 x 10^2) x (5 x 10^5)written in

    asked by Essie on October 13, 2015
  32. Chemistry check and help

    so for all the chemical formulas if there is no subscript (for the valency of the element) does it mean it is a one or do i have to find the valency on the periodic table of elements? ex. P02 the P for Phosphorus doesn't have a number does it mean it is a

    asked by Sam on February 16, 2014
  33. Math (Calculus II) (Volume Revolution Setup)

    Consider the graph of y^2 = x(4-x)^2 (see link). Find the volumes of the solids that are generated when the loop of this graph is revolved about (a) the x-axis, (b) the y-axis, and (c) the line x = 4. goo.gl/photos/v5qJLDztqsZpHR9d7 I'm just having trouble

    asked by Ray on April 28, 2017
  34. 9 word sentence, please help!!

    aamaesneadsiainnacedgthteohkhmecy * it's 9 words long * it has to do with sports * it rhymes those are my clues....please help.. Try these: http://www.ssynth.co.uk/~gay/anagram.html http://wordsmith.org/anagram/ http://www.unscramble.net =) Thank you for

    asked by megz on April 14, 2007
  35. chemistry help!

    I have a chemistry test tomorrow and I'm trying to study but none of these questions in the book make sense to me:( Help! 1. Commericially available concentrated sulfuric acid is 95% H2SO4 by mass and has a density of 1.84g/mL. How many milliliters of this

    asked by Maycee on October 18, 2009
  36. orgoo

    calculate how to make 10 mL of 15:85 ethyl acetate:hexane solution from 2 mL of 5:95 ethyl acetate:hexane, using pure hexane and pure ethyl acetate.

    asked by Jess on October 13, 2012
  37. college orgo

    calculate how to make 10 mL of 15:85 ethyl acetate:hexane solution from 2 mL of 5:95 ethyl acetate:hexane, using pure hexane and pure ethyl acetate.

    asked by sara on October 15, 2012
  38. chem

    calculate how to make 10 mL of 15:85 ethyl acetate:hexane solution from 2 mL of 5:95 ethyl acetate:hexane, using pure hexane and pure ethyl acetate.

    asked by Julie on October 14, 2012
  39. Game Theory

    Policy makers in Washington, D.C., face a dilemma. On the one hand they can try to pressure the Iraqi government into trying to disarm the militias. If the effort to disarm the militias succeeds, this might put an end to the sectarian violence and bring

    asked by Daniel on December 3, 2008
  40. Chemistry

    Need Help with these two problems 1.One piece of copper jewelry at 111°C has exactly twice the mass of another piece, which is at 36.0°C. Both pieces are placed inside a calorimeter whose heat capacity is negligible. What is the final temperature inside

    asked by Jamie on October 12, 2008
  41. osmotic pressure chemistry.

    I have a question about osmotic pressure. I took a test in chemistry and this was a multiple choice question. It said given the molar mass of each solution, which one had the high osmotic pressure. So a high osmotic pressure, means a high molar mass or a

    asked by Anonymous on February 14, 2009
  42. Vectors Math

    I was given this info r=1.5 m d=3 m F= 50 N angle= 110 degrees 1. What torque is APPLIED ? T=Fsin T= (1.5)(50)sin(110) T=70 N m 2. At what angle would enough force be applied to achieve maximum toque? T=Fsin T= (1.5)(50)sin(10) T=13.0 N m 3. If someone

    asked by Jamie on February 28, 2015
  43. math

    In English Class, after studying a book called \The Lord of the Flies" by William Golding, students are split into 6 groups and each group is required to make a fi lm based on one of the 8 important scenes in the novel. Each group can choose which scene

    asked by Aditya on April 2, 2014
  44. math

    Jeremy enlarged a picture.The length of the original picture is 8cm and the width is 5cm.The length of the enlarged picture is 10cm and the width is 7cm. A.What percent is the 10cm length of the 8cm length? B.What is the area of each picture?By what

    asked by Dj on September 28, 2015
  45. Flame Colors - Chemistry

    I've searched the internet but I can't find out what color flame a Nickel (or even better NiSO_4) solution will produce when burned. As well, does Aluminum (Al(SO_4)_3 ) have a flame color from the flame test? Don't know sorry!Wih I could help!Can you help

    asked by J.M. on November 6, 2006
  46. Physical science

    A silver Christmas tree can be made by placing copper wire,shaped in the form of a tree,into a silver nitrate solution.The unbalanced equation for the reaction is:Cu+AgNO3=Cu(NO3)2+Age 9.1 define the term oxidation in terms of oxidation numbers (9.2) write

    asked by Thulani on September 3, 2018
  47. BIOLOGY

    Consider the following 45 base-pair (bp) DNA sequence: 1 10 20 30 40 | . | . | . | . | . 5’-CGCACCTGTGTTGATCACCTAGCCGATCCACGGTGGATCCAAGGC-3’ ||||||||||||||||||||||||||||||||||||||||||||| 3’-GCGTGGACACAACTAGTGGATCGGCTAGGTGCCACCTAGGTTCCG-5’ You also

    asked by Bidex on November 8, 2013
  48. biology

    Consider the following 45 base-pair (bp) DNA sequence: 1 10 20 30 40 | . | . | . | . | . 5’-CGCACCTGTGTTGATCACCTAGCCGATCCACGGTGGATCCAAGGC-3’ ||||||||||||||||||||||||||||||||||||||||||||| 3’-GCGTGGACACAACTAGTGGATCGGCTAGGTGCCACCTAGGTTCCG-5’ You also

    asked by Anonymous on May 2, 2013
  49. history

    Discuss how the rise of capitalism led to the development of communism. I put: • Capitalism was where individuals and business firms would carry out all factors of production and trade. The owners would control the prices of their products. When

    asked by Anonymous on April 14, 2011
  50. Math Please Check My Answer

    A box contains 95 pink rubber bands and 90 brown rubber bands. You select a rubber band at random from the box. Find each probability. Write the probability as a fraction in simplest form. a. Find the theoretical probability of selecting a pink rubber

    asked by OceanBreeze on May 7, 2015
  51. Chemistry

    Which of the following is NOT true about the thermodynamic standard state? A. A solid is in its standard state when the atmospheric pressure is 1.00 atm and the temperature is 25C. B. A pure liquid is in its standard state at 25C and a vapor pressure of

    asked by Tom on May 17, 2008
  52. Math

    What is 0.68 written as a simplified fraction? My answer is 17/25. What makes the statement true? 7^-2= My answer is 14. What is 308,745,538 is scientific notation? My answer is 3.1 x 10^8. What is the solution to (3 x 10^2) x (5 x 10^5)written in

    asked by Essie on October 13, 2015
  53. English (please check someone)

    Please check this. Thanks! 1. Which of the following should be put in italics to correct the following sentence? Other famous vehicles that suffered a tragic end include the zeppelin Hindenburg and the ocean liner Lusitania. (1 point) Hindenburg and

    asked by Mame on May 6, 2016
  54. Math

    As a restaurant owner there are many decisions that you need to make on a daily basis, such as where to keep inventory levels. You wish to replenish your stock of dishes by purchasing 250 sets for your restaurant. You have two dish design from which to

    asked by Mary Troy on November 6, 2010
  55. science

    what are 4 differences between ionic and covalent bonding? plz help thanks!! http://antoine.frostburg.edu/chem/senese/101/compounds/faq/properties-ionic-vs-covalent.shtml i clicked on the link but it doesnt tell me anything See if it works (Broken Link

    asked by hannah on March 19, 2007
  56. Chicago Manual (CM) and Council of Science Editors

    Question 1 5 points Save Which of the following fields uses Chicago Manual of Style (CM) documentation? psychology history education biology Question 2 What information goes in the parentheses when using CM style numbered notes? the publishing information

    asked by christopher on May 2, 2010
  57. Algebra

    when writing linear equations, how do you determine which form of a line to use? choose 1 set of points from the choices below. then, solve the problem and post your solution, showing your steps. write an equation in point-slope form for the line that

    asked by Faith on December 9, 2014
  58. AP CHEM FULL ?

    This is part of a marathon problem, we have to identify the five compunds of H, N, and O described below. For each compound, I have to write a Lewis structure that is consistent with the information given. a.) All the compunds are electrolytes, although

    asked by Sam on December 2, 2006
  59. french- subjontif

    ok! i have a huge french test comming up in 2 days and i need help with memorizing the subjontif and imparitif of a verb as well as infinatif. (sorry, i cant spell!) Thank you for using the Jiskha Homework Help Forum. To memorize, you need to analyze what

    asked by Leah on January 16, 2007
  60. Chemistry (Urgent)

    Ksp of PbI2 at 25 degrees celcius and 15 degrees celcius is 7.5×10^-8 and 7.5×10^-9 respectively. (Pb=207 I=127) 1) write an expression for the equilibrium of PbI2 2)write an equation for the Ksp of PbI2 3)calculate the solubility of PbI2 at 25 degrees

    asked by Isura on February 28, 2017
  61. Science

    Some areas of an ocean are known as dead zones. These zones form when algae decomposes after an algae bloom. The increased number of decomposing algae use up oxygen from the water. Which human activity is most affected by the increasing number of dead

    asked by lilkakes on January 8, 2019
  62. chemistry

    If the stockroom fails to dry the KHP to remove the waters of hydration, the student's calculated concentration for the standardized base will be (low, high, or unaffected) A drop of NaOH is hanging from the buret tip before the titration of KHP. Once the

    asked by help on April 18, 2010
  63. chemistry HELP PLEASE !

    A solution consisting of isobutyl bromide and isobutyl chloride is found to have a refractive index of 1.3931 at 20oC. The refractive indices at 20oC of isobutyl bromide and isobutyl chloride are 1.4368 and 1.3785, respectively. Determine the molar

    asked by Blair on November 5, 2008
  64. Chemistry

    Exhibit 8-1 For the following questions, consider the equation below. Zinc will react with a solution of hydrochloric acid to produce hydrogen gas: Zn(s) + 2 HCl(aq) ® ZnCl2(s) + H2(g) Refer to Exhibit 8-1. How many moles of hydrochloric acid react with

    asked by nan on December 14, 2011
  65. chemistry

    If the stockroom fails to dry the KHP to remove the waters of hydration, the student's calculated concentration for the standardized base will be (low, high, or unaffected) A drop of NaOH is hanging from the buret tip before the titration of KHP. Once the

    asked by Confused on April 1, 2008
  66. physics

    A red train traveling at 72 km/h and a green train traveling at 144 km/h are headed toward one another along a straight, level track. When they are 950m apart, each engineer sees the other’s train and applies the brakes. The brakes decelerate each train

    asked by ben on September 17, 2006
  67. english can someone check my answers

    Sonny and _me___ have been inducted into the National Honor Society I Me The guide showed the other tourists and __them____ where in the palace the Treaty of Versailles had been signed. They Them The experimental vaccine against the malaria parasites

    asked by lauren on January 8, 2011
  68. chem

    Some sulfuric acid is spilled on a lab bench. It can be neutralized by sprinkling sodium bicarbonate on it and then mopping up the resultant solution. The sodium bicarbonate reacts with sulfuric acid as follows. 2 NaHCO3(s) + H2SO4(aq) --> Na2SO4(aq) + 2

    asked by hannah on December 11, 2010
  69. PreCalculus

    The question is: -5e^(-4x+2) +3= 1/2log(1+x^2) Solve with a calculator for the smallest possible solution, with steps. So this hasn't really been covered in my schoolwork so I'm trying to work off what I have learned. I started with the change of base

    asked by ConfusedWithMath on November 15, 2017
  70. University of Botswana

    What is the relevance of the academic study of the Bible today,especially in African context. One of the controversies concerns the actual location of the kingdom of Sheba; some scholars say it was in Ethiopia (Africa) and others claim it was in Yemen

    asked by Simon on August 15, 2007
  71. French Accent Marks

    I have to write a lot of french essays for my class and I usually need to type them. I was wondering of anyone could tell me how to put the accent marks over the a, e and stuff. Can anyone help? The following will work if you type your papers in a word

    asked by Tiffanie on December 19, 2006
  72. Microeconomics help please!

    If someone colud help with these questions I would be very greatful, Ive been trying for awhile now and Im at my ropes end. 1)The perfectly competitive ice cream industry is assumed to be in long-run equilibrium. Suppose there is an increase in the market

    asked by crstudent on July 15, 2005
  73. chemistry

    Which weak acid would be best to use when preparing a buffer solution with a pH of 8.50? 1) an acid with Ka=3.3x10^-9 2) an acid with Ka=5.0x10^-4 3) an acid with KA=6.3x10^-6 4) an acid with Ka=5.0x10^-7 5) an acid with Ka=4.0x10^-5 6) an acid with

    asked by Anonymous on April 8, 2013
  74. Math

    Can you please check my answers, thank you #2. 5/y+4 + 11/y^2=y-12 = 7/y-3 Answer -2 #4 The length of a rectangle is 2 cm more than twice its width. If the perimeter of the rectangle is 40 cm, find the length of the rectangle. A. 6 cm B. 9 cm C. 11 cm D.

    asked by Ron on August 26, 2012
  75. linear equations

    Given: square root of 5 minus x is equals to x plus 1. Show that the solution to the above equation lies in the interval of negative 1less than or equals to x less than or equals to 5. Solve the equation. Solve the equation negative square root of 5 minus

    asked by Andiswa on March 6, 2016
  76. chemistry

    Molarity is to moles of solute over liters of solution as molality is to A. molar concentration over molal concentration. B. moles of solute over kilograms of solvent. C. molal concentration over molar concentration. D. moles of solute over moles of

    asked by arthur on July 26, 2013
  77. Physics Class

    A 0.140-kg baseball is pitched horizontally at 36.7 m/s. When a player hits the ball, it moves at the same speed, but in the opposite direction. If the bat and the ball are in contact for 0.450 ms, calculate the average force the bat exerts on the ball.

    asked by JLW Physics on January 16, 2015
  78. Biology

    The metabolic pathways of organism living today evolved over a long period of time- undoubtedly in a step wise fashion because of their complexity. Considering everything you have learned to date about the evolution of life on Earth, put the following in

    asked by Trinh on March 23, 2015
  79. Chemistry

    Under standard conditions, the Gibbs free energy of the reactants G,std(reactants) in a redox reaction in aqueous solution is 360.65 kJ and the Gibbs free energy of the products G,std(products) is 158.14 kJ. The number of moles, n, of electrons transferred

    asked by Daphne on March 16, 2016
  80. Physics

    An object is released from rest at height h above the surface of the Earth, where h is much smaller than the radius of the Earth. It takes t seconds to fall to the ground. At what height should this object be released from rest in order to take 2t seconds

    asked by Liza on June 23, 2012
  81. Literature

    When you finish Antigone , you’ll write an essay analyzing the causes and/or effects of an issue, situation, or event in your journal. Your textbook explains the assignment this way: “…you’ll help readers understand an event or situation by

    asked by Petisa on April 16, 2012
  82. Chemistry

    Thank you for being helpful in the past. Could you check my interpretation of the three chemical word problems below,and,let me know if I'm on the right track? 1.Determine the mass of water vapor formed when 1.00g of Butane (C4H10)is burned in a

    asked by Cliff on November 3, 2010
  83. Math

    An open box contains 80cm^3 and is made from a square piece of tinplate with 3cm squares cut from each of its four corners. Find the dimensions of the original piece of tinplate. A=80 A=(length)(width)(height) since length and width are the same, and when

    asked by Anonymous on October 7, 2010
  84. ''To Kill a Mockingbird" by Harper Lee?

    Jem and Scout's respect for their father is greatly increased when he: a. Collects a large fee from a client. b. Argues with Mrs. Dubose. c. Shoots a mad dog. d. Stops a burglar. Atticus receives payment from Mr. Cunningham as: a. Hickory nuts and stove

    asked by Ernest on August 10, 2009
  85. physics

    An object of mass 2.0 kg starts from rest at the top of a frictionless curved ramp. At the bottom, it collides with and sticks to another 2.0-kg mass object. Together the objects then cross a small rough section where there is friction before leaving the

    asked by Anonymous on December 3, 2014
  86. Business law

    Would you be able to check my 5 answers: 1. The continued possession by a minor of a good after reaching the age of majority will be treated as an implied ratification of the contract by which the minor acquired that good Answer True 2. If a contract is

    asked by Mike on February 29, 2008
  87. Chemistry help needed

    How do I prepare 90% formic acid from conc. formic acid (98%-100% of density 1.22g/ml)? Please help me check if my calculations are correct. Assuming conc. formic acid is 99%, 0.99 X 1.22 = 1.2078 Add 1.2078 / 9 = 0.1342ml H2O to 1ml of conc. acid to have

    asked by tricia on December 17, 2008
  88. math

    I have to find an exact solutions on the interval [0,pi) for both of these problems-- 1) 2sin2x = sqrtx and 2) 1-2sqrt2 sinxcosx = 0 I know this much: 1) sin2x = (sqrt x)/2 = 2sinxcosx = (sqrt x)/2 What do I need to do next? 2) 1/(2 sqrt2) = sinxcosx =

    asked by kristie on August 1, 2006
  89. chemistry

    In quality control of raw materials for pharmaceutical production often used foul reactions to prove that raw materials in salt form containing the appropriate salt. Hydrochloride (eg. Amitriptyline hydrochloride) can be detected for example by

    asked by Maria on September 9, 2016
  90. shortest fence

    this is my last question from applications of derivatives! A 216m^2 rectangular pea patch is to be enclosed by a fence and divided into two equal parts by another fence parallel to one of the sides. What dimensions for the outer rectangle will require the

    asked by Jen on November 18, 2006
  91. Chemistry

    PartA: What volume of 10.0M NaOH is needed to prepare a buffer with a pH of 7.79 using 31.52 g of TrisHCl? TrisHCl is a weak base and the molecular weight is 157.67 g/mol. I found the solution, it is 6.67 milliliters. Part B: "The buffer from Part A is

    asked by Linda on April 24, 2009
  92. Check!!

    Can someone check whether I put the effects into the right category? Consequences of marijuana use. Physical: rapid heartbeat dry mouth and throat bloodshot eyes Reduced ability to perform tasks requiring concentration and coordination such as driving a

    asked by John on October 12, 2009
  93. chemistry- lab

    i need help locating a lab for regents chemistry. i have the data sheet but misplaced the rest of the lab. i know it's online somewhere, but i'm not sure which lab it is.. (what it is called). The data sheet has 3 charts on it, 1 titled 'solubility'. it

    asked by Anonymous on March 15, 2009
  94. chemistry lab repost

    i need help locating a lab for regents chemistry. i have the data sheet but misplaced the rest of the lab. i know it's online somewhere, but i'm not sure which lab it is.. (what it is called). The data sheet has 3 charts on it, 1 titled 'solubility'. it

    asked by please help! on March 15, 2009
  95. Chemistry

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    Hi I think how plants reproduce is a very complicated process and the structure of the plant ,, can anyone please give me a help and show me how plants reproduce cause my sats are coming and I'm in Grade 9 Thanks and I will be grateful to you You are

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  97. Math

    For the following equation, state the value of the discriminant and then describe the nature of the solutions. -9x^2+6x-2=0 what is the value of the discriminant? Which one of the statements below is correct? A) the equation has two imaginary solutions. B)

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  98. math Lsson:11 unit 3

    1. estimate the circumference of the circle. use 3.14 as pi . round the nearest unit. The circle says 24. A. 27 b. 79 c.1,809 d. 151**** 2. Estimate the radius of a circle with the circumference of 272.2 inches. Use 3.14 for pi. Round to the nearest tenth.

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    Raul did an inventory of all the books in collection by subject. He displayed his results in the table below . Use the table to solve to solve each problem. Raul's book Collectio Subject of book. Number of books History. 72 Art 81 Science. 54 Travel. 63

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  100. chemistry

    What is the molar solubility of silver carbonate Ag2CO3 at 25 C if it is dissolved in a 0.15M solution of silver nitrate, AgNO3? Solubility constant: silver carbonate = 8.1 *10^(-12) Answer: 3.6 *10^(-10) So... not sure exactly what to do here. AgCO3 +

    asked by molar solubility on July 30, 2011