Popular questions and responses by jake

    A Statistics teacher has the following test scores : 93, 72, 80, 95, 90, 70, 91, 85, 86, 100 What is the median test score of these grades ?

    asked on June 3, 2010

    There are 10 colored balls in a box ( 5 red, 3 blue, 2 green ). What is the probability of picking out a red ball and then a blue ball ( If I do not replace the red ball

    asked on June 2, 2010
  3. english

    1. Write a composition using one of the topics listed below. Your composition should be three to five paragraphs long. It should contain an introduction, a body, and a conclusion. c. Compare and contrast driving in the winter and driving in the summer. 2.

    asked on January 10, 2012

    What type of distribution is described by the following information? Mean = 56 Median = 58.1 Mode = 63

    asked on June 2, 2010
  5. Physics

    If you shine an ultraviolet light on the metal ball of a negatively charged electroscope, it will discharge. But if the electroscope is positivelely charged, it won't discharge. Why?

    asked on April 2, 2008
  6. Algebra

    Find all values of t such that [t] =2t+3. If you find more than one value, then list the values you find in increasing order, separated by commas. The brackets represent the floor sign function.

    asked on December 13, 2014
  7. Chemistry

    If you wanted to create a equimolar buffer using 1.0 mol of NaHS in 1.0L of water what acid would you need to add? how many moles of that acid do you need to add?

    asked on February 11, 2017
  8. math

    Suppose that the height (in centimeters) of a candle is a linear function of the amount of time (in hours) it has been burning. After 11 hours of burning, a candle has a height of 16.5 centimeters. After 30 hours of burning, its height is 7 centimeters.

    asked on August 4, 2020
  9. Calculus

    A man of height 1.7 meters walks away from a 5-meter lamppost at a speed of 1.6 m/s. Find the rate at which his shadow is increasing in length. (Round your answer to three decimal places.) This problem is absolutely killing me I see a lot of examples like

    asked on October 7, 2015
  10. Chemistry

    Which pair of ions will be most likely to react at standard state conditions? 1. a) MnO4- and Sn2+ 2. b) Zn2+ and Cl- 3. c) I- and Cu 4. d) Fe3+ and Cu2+

    asked on May 15, 2012
  11. chemistry

    What is the net ionic equation for the reaction of formic acid, HCOOH, with NH3? A. H+(aq) + NH3(aq) → NH4+(aq) B. H+(aq) + OH–(aq) → H2O(l) C. HCOOH(aq) + NH3(aq) → NH4+(aq) + HCOO–(aq) D. HCOO–(aq) + H+(aq) + NH3(aq) → NH4HCOO(aq) E.

    asked on November 10, 2010
  12. Chemistry

    Using the following spontaneous reactions, classify the 3 metals involved (Cr, Sn, Al) according to increasing reductant properties. a) 2Cr + 3Sn2+ 2Cr3+ + 3Sn b) Al + Cr3+ Al3+ + Cr

    asked on May 15, 2012
  13. Chemistry

    The following reaction has a Delta G value of 42.6 kJ/mol at 25oC: HB(aq) +H2O(l) --> H3O+(aq) +B-(aq) Calculate Ka for the acid HB.

    asked on May 7, 2012
  14. Chemistry

    If a piece of copper metal is dipped into a solution containing Cr3+ ions, what will happen? Explain with Ev values

    asked on May 15, 2012
  15. Chemistry

    All of the following are postulates of the kinetic molecular theory of gases except A. The gas molecules are in constant motion. B. The gas molecules are in rapid motion. C. The collisions between molecules are elastic. D. At a constant temperature, each

    asked on December 9, 2010
  16. chem (science)

    Which of the following pairs of elements are likely to form ionic compounds: A) helium and oxygen B) magnesium and chlorine C) chlorine and bromine D) potassium and sulfur E) sodium and potassium F) nitrogen and oxygen I believe the answer is d and f Would

    asked on September 18, 2011
  17. Chem

    when 21.70 ml of 0.5000 m h2so4 is added to 21.70 mL of 1.000 M KOH in a coffee cup calorimeter at 23.50 degrees c, the temperature rises to 30.17 degree c. calculate delta H of this reaction (Assume that the total volume is the sum of the individual

    asked on October 7, 2014

    The Sarasota Police department collected data on the number of car accidents ( X ) that occur each day on a certain stretch of route 41. From this data, they derived the probability distribution shown in the table below. X P(X) 0 0.80 1 0.15 2 0.05 What is

    asked on June 2, 2010
  19. math

    The diagonal of a TV set is 26 inches long. Its length is 14 inches more than the height. Find the dimensions of the TV set.

    asked on February 21, 2016
  20. Chemistry

    consider the following reaction at 298K 4Al(s)+3O2(g) yields 2Al2O3(s) delta H= -3351.4 Kj find delta S sys find delta S surr find delta S unvi

    asked on January 29, 2015
  21. 8th grade math

    Jerome, Kevin, & Seth shared a submarine sandwich. Jerome ate 1/2 of the sandwich, Kevin ate 1/3 of the sandwich and Seth ate the rest. What is the ration of Jerome's share to Kevin's share to Seth's share? 1. 2:3:6 2. 2:6:3 3.3:1:2 4.3:2:1 5.6:3:2 please

    asked on December 7, 2012
  22. physics

    5) After catching the ball, Sarah throws it back to Julie. The ball leaves Sarah's hand a distance 1.5 meters above the ground, and is moving with a speed of 22.0 m/s when it reaches a maximum height of 9.0 m above the ground. What is the speed of the ball

    asked on September 10, 2012
  23. chemistry

    A gas absorbs 45 kJ of heat and does 29 kJ of work. Calculate the change in energy. The answer is 16 kJ, but I don't understand why. If a gas absorbs heat and does 29 kJ of work. Wouldn't they both be positive? Change in energy = q + w 45 kJ + 29 kJ = 74

    asked on March 31, 2010
  24. Spanish

    Conjugate the following irregular verbs in the simple present tense (Indicative). 6. tener (to have) yo ________________________ 7. tener (to have) nosotros ________________________ 8. venir (to come) tú ________________________ 9. venir (to come)

    asked on February 6, 2016
  25. Physics Need Help PLEASE

    Two point charges are separated by 8 cm. The attractive force between them is 14 N. If the two charges attracting each other have equal magnitude, what is the magnitude of each charge?

    asked on April 9, 2012
  26. english

    1. Write a composition using one of the topics listed below. Your composition should be three to five paragraphs long. It should contain an introduction, a body, and a conclusion. c. Compare and contrast driving in the winter and driving in the summer. 2.

    asked on January 10, 2012
  27. Chemistry

    Determine how many mL of solution A (acetic acid-indicator solution) must be added to solution B (sodium acetate-indicator solution) to obtain a buffer solution that is equimolar in acetate and acetic acid. Solution A: 10.0 mL 3.0e-4M bromescol green

    asked on October 29, 2012
  28. chemistry

    From the following information, determine ΔH°f of malonic acid, CH2(COOH)2(s). CH2(COOH)2(s) + 2O2(g) → 3CO2(g) + 2H2O(l); ΔH° = –861.0 kJ Substance ΔH°f (kJ/mol) CO2(g) –393.5 H2O(l) –285.8 A. 2613.1 kJ B. –1540.3 kJ C. –2613.1 kJ D.

    asked on December 2, 2010
  29. Algebra

    Let a1,a2,a3..... be an increasing arithmetic sequence of integers. If a4a5=13 what is a3a6?

    asked on December 13, 2014
  30. Chemistry

    Which of the following compounds has the highest vapor pressure at 25°C? A. CH3CH2OH B. CH3OCH3 C. CH3CH2CH2Cl D. CH3CH2CH3 E. CH3CH2CH2CH

    asked on December 9, 2010
  31. Physics

    A lead ball, with an initial temperature of 25.0oC, is released from a height of 125.0 m. It does not bounce when it hits a hard surface. Assume all the energy of the fall goes into heating the lead. Find the temperature (in degrees C) of the ball after it

    asked on February 7, 2019
  32. Chemistry

    CaO(s) + 3C(s) > CaC2(s) + CO(g) deltaHrxn = +464.8 kJ/mol-rxn Is the reaction endothermic or exothermic? What is the enthalpy change if 10.0 g of CaO is allowed to react with an excess of carbon?

    asked on December 8, 2010
  33. Math Check 2 ?s quick

    The angle of elevation to the top of a 20-story skyscraper is measured to be 10 from a point on the ground 1,500 feet from the building. Find the height of the skyscraper in feet, correct to three decimal places. (Points : 5) 260.47 73.86 972.54 264.49

    asked on January 14, 2014
  34. Statistics

    For a 10 point quiz, the professor recorded the following scores for 8 students: 7, 8, 3, 9, 10, 6, 8, 5 What is the Mean for this set of scores?

    asked on June 1, 2010
  35. Precalculus

    Write 4log2+log6-log3 as a single logarithm. Explain with steps please!~~

    asked on January 30, 2012
  36. history

    4. Which sentence contains a verb in the simple past tense? A. She obeys her father. B. She has obeyed her father. C. She had obeyed her father. [D. She obeyed her father.] is my answer correct

    asked on December 14, 2011
  37. art

    A sculptor creates a bust of a famous politician out of marble and places it in the outdoor courtyard of the capitol building. Why did he chose marble?

    asked on January 22, 2015
  38. chemistry

    Which two orbitals from CV+ and –OH will overlap creating the C-O bond in CVOH? Which of the following accurately shows the orbital interaction that leads to bond formation between CV+ and –OH?

    asked on November 7, 2010
  39. math

    The population p of a city is given by p=240,360e^0.012t where t=0 represents 1990. According to this model, when will the population reach 275,000? I know that you have to sustitute 275,000 into the p but I do not know how to solve it.

    asked on September 14, 2009
  40. Physics Help!!

    A passenger on an interplanetary express bus traveling at v = 0.94c takes a seven-minute catnap by his watch. How long does the nap last from your vantage point on a fixed planet?

    asked on May 5, 2012
  41. Calculus

    Suppose f(x) is a continuous function. Then a function F(x) such that F'(x) = f(x) is called: A.) the indefinite integral of f B.) the antiderivative of f C.) an antiderivative of f D.) a definite integral of f E.) All of the above

    asked on February 28, 2020
  42. chemistry

    The standard internal energy change for a reaction can be symbolized as ΔU°rxn or ΔE°rxn. For the following reaction equations, calculate the energy change of the reaction at 25 °C and 1.00 bar. Sn(s) + 2Cl2(g) --> SnCl4(l) ΔH°rxn = -511.3 kJ/mol

    asked on February 28, 2016
  43. Chemistry

    Complete and balance the precipitation reactions. Include physical states in your equations. Ba(NO3)2(aq) + CuSO4 (aq)---> K3PO4(aq)+MgCl2 (aq)---->

    asked on November 9, 2013
  44. Math

    If an object travels in a circle 32pi/5 radians, at what degree measure is it, relative to where it started? a) 1052° b) 144° c) 72° d) 98.6° I got 1152° but there is no option for the answer, what did I wrong?

    asked on January 18, 2012
  45. algebra

    For all positive integers x, let x▲ be defined to be (x-1)(x+1). Which of the following is equal to 6▲ - 5▲ ? Does this mean I'm supposed to multiply the 6 and the 5 to (x^2-1) and subtract them from each other?

    asked on September 13, 2011
  46. Chemistry

    Calculate the molar concentration of acetic acid (CH3COOH) in a 5.00-mL sample of vinegar (density is 1.00 g/mL) if it is titrated with 25.00 mL of NaOH.

    asked on March 4, 2009
  47. Physics

    Mary needs to row her boat across a 100m wide river that is flowing to the east at a speed of 1.0m/s. Mary can row with a speed of .0m/s a) If mary points her boat due north, how dar from her intended landing spot will she be when she reaches the opposite

    asked on September 14, 2012
  48. writing skills

    7. The best way to ensure parallel construction in your essay is to use similar A. paragraph lengths. [B. sentence structure throughout.] C. topic headings in your outline. D. details in each paragraph.

    asked on August 23, 2012
  49. Biology

    Among humans, increased interest in food intake normally occurs _____. only after the production of glucose in the liver can no longer meet metabolic needs when fewer calories are taken in than are expended, but only after the body depletes its reserves of

    asked on March 14, 2012
  50. Precalculus

    Solve for x: 6^(x+3) - 6^x = 215. I got answer as 1, is it correct?

    asked on January 29, 2012

    The area under a normal curve distribution is Equal to 100 almost equal to 1 equal to 1 equal to .5

    asked on June 3, 2010
  52. Math

    This month Carla caught the following fish in Lake George, 24 trout, 41 sunfish, 12 perch and 23 blue gills. If Carla catches another fish this month, what is the probability of her catching a trout? A. about 1/2 B. about 1/4 C. about 1/24 D. about 1 My

    asked on March 8, 2019
  53. chemistry

    write the balanced molecular and net iconic equations for the reaction between aluminium metal and silver nitrate. Identify the oxidation and reduction half-reaction

    asked on October 19, 2014
  54. math

    A candle is 17 in. tall after burning for 3 hours. After 5 hours, it is 15 in. tall. Write a linear equation to model the relationship between height h of the candle and time t. Predict how tall the candle will be after burning 8 hours.

    asked on October 9, 2012
  55. Math

    How do I solve this if there is no equation to this 1. The population of the bacteria in a Petri dish increases by a factor of 10 every 10 hour. If there are initally 20 bacteria in the dish, how long will it take before the population increases to 60,000

    asked on January 28, 2012
  56. Math

    1. The height of a bumble bee above the ground is modelled by h(t) = 0.5cos(2π t) + 2, where h is in metres and t is in seconds. At what time is the bee’s instantaneous rate of change of height with respect to time greatest? a.) 1 s b.) 1.25s c.) 1.5s

    asked on January 18, 2012
  57. Calculus

    A hot-air balloon is 180 ft above the ground when a motorcycle passes directly beneath it (travelling in a straight line on a horizontal road) going at a constant speed of 60 ft/s. If the balloon is rising vertically at a rate of 15 ft/s, what is the rate

    asked on March 15, 2011
  58. Chemistry

    If i titrated 25.0mL of 0.500M HCl with 0.500M NaOH and then 25.0mL of 0.500M of an unknown weak acid HA with 0.500M NaOH. How would the two titration curves compare at 10 or 15mL of NaOH Beyond equivelance pts? I think that they will be the ssame or

    asked on March 3, 2011
  59. chemistry

    The strongest intermolecular forces present in a sample of pure I2 are A. covalent bonds. B. covalent network bonds. C. metallic bonds. D. dipole–dipole forces. E. London forces.

    asked on December 9, 2010
  60. reading

    What is a summary for chapter 2 slam by Walter dean Myers

    asked on March 7, 2017
  61. Geometry

    What is the area of a regular pentagon with an apothem 14 inches long and a side 20 inches long? Round the answer to the nearest inch. Answer choices: 1400 in.^2 700 in.^2 175 in.^2 140 in.^2 Give work, not answer, please.

    asked on May 14, 2016
  62. Algebra

    The fifth term of an arithmetic sequence is 11. If the difference between two consecutive terms is 1, what is the product of the first two terms?

    asked on December 13, 2014
  63. Physics

    Four resistors 2.1Ω, 3.2 Ω, 4.3 Ω, and 5.4 Ω are connected in a series to a 9 V battery. The effective resistance in the circuit is:

    asked on May 28, 2013
  64. phsyics

    Bat is flying 5m/s while chasing an insect that is flying in the same direction. The bat emits 40kHz chirp and hears a 40.4kHz reflected sound wave. What is the speed of the insect? ??? lost

    asked on July 19, 2012
  65. Chemistry

    Can a solution of CrCl3 be stored in an aluminum container?

    asked on May 15, 2012
  66. Math

    In an election, ethan got 5 fewer votes than christohper,who got 3 more votes than olivia, who got 4 fewer votes than Ava. How many more votes did ava get than ethan ?

    asked on April 21, 2012
  67. Calculus

    Determine an expression, in simplified form, for the slope of the secant PQ. Given: P(1,3) , Q(1+h, f(1+h)) , where f(x) = 3x^2 PQ=Y2-Y1/X2-X1 I keep getting wrong answer, arghhh.

    asked on February 8, 2012
  68. Chemistry

    A 0.250-g sample of a magnesium-aluminum alloy dissolves completely in an excess of HCl (aq) . When the liberated H2 (g) is collected over water at 29 degrees celsius and 752 torr, the volume is found to be 301 mL . The vapor pressure of water at 29

    asked on February 28, 2011
  69. math

    A man is 6ft tall is standing 10 feet from the base of a lamp post. The mans shadow has a lenght of 4ft . How tal is he lamp post

    asked on January 31, 2011
  70. Physics

    If a cannonball and a BB have the same speed, which has the longer wavelength?

    asked on April 2, 2008
  71. Chemistry

    What is the Lewis structure for salicylic acid ?

    asked on November 23, 2015
  72. Physics

    A brick of mass 2.3 kg is lifted to a height of 1.9 m. How much gravitational potential energy is added to the brick? Acceleration due to gravity is g = 9.8 m/s2.

    asked on November 16, 2014
  73. Algebra

    Which represents the reference angle for 3pi/4? A) (3 pi)/4 B) pi/3 C) pi/4 D) pi/6 I have no clue on how to do this. (Looking at my unit circle I think A?)

    asked on May 29, 2014
  74. science

    The acceleration of gravity on the surface of Venus is 8.9m/s^2. Would a ball thrown upward on Venus return to the ground sooner or later than a ball thrown upward with the same speed on the earth?

    asked on February 22, 2013
  75. math

    there are 10 marbles in a bag: 1 blue, 4 yellow, 3 red, and 2 white. if you choose a marble at random, what is the probability that you will NOT choose white?

    asked on July 16, 2012
  76. writing skills

    12. Which sentence contains a prepositional phrase? A. They tried, although they didn't expect to win. [B. Running all the way, he got there early.] C. With the proper help, they'll complete the project early. D. They sang it, and sang it again.

    asked on July 2, 2012
  77. math

    3. The gross income of David Vaughn is $785 per week. His deductions are $42.25, FICA tax; $90.33, income tax; 2% state tax; 1% city tax; and 3% retirement fund. What is her net income for one week? A. $675.32 B. $628.77 [C. $605.32] D. $749.77

    asked on January 10, 2012
  78. english

    11. The following sentence contains which type of conjunction? He is not only a great player but also an exceptional coach. A. Correlative [B. Coordinating] C. Phrasal D. Subordinating is my answer correct

    asked on December 14, 2011
  79. math

    Suppose the mean of dogs a pet shop grooms each day is known to be 14.2 dogs. If a sample of n=12 days is chosen and a total of 178 dogs are groomed during those 12 days, then the sampling error is?

    asked on December 10, 2011
  80. Economics

    As the aggregate price level falls, the number of domestic products purchased by foreigners will [rise], causing the quantity of domestic output demanded to [rise]. This is known as the [foreign purchases effect]. The first two blanks can be rise,fall or

    asked on March 6, 2011
  81. chemistry

    I got E) for the first and couldn't figure out the other one. Can any one verify the first and help with the second?? In which of the following processes is there a decrease in the potential energy of the substances involved? A) a coil spring is compressed

    asked on January 13, 2011
  82. chemistry

    Precipitation Reactions Write a molecular equation for the precipitation reaction that occurs (if any) when the following solutions are mixed. If no reaction occurs, write NO REACTION. Express your answer as a chemical equation. Identify all of the phases

    asked on February 9, 2009
  83. Math

    1.) A cooler contains fourteen bottles of Sports drinks: Seven lemon-lime flavored and seven orange flavored. You randomly grab a bottle and give it to your friend. Then, you randomly grab a bottle for yourself. What is the probability that you and your

    asked on December 12, 2019
  84. Spanish

    . Choose the correct form of the verb comer (to eat) that agrees with the subject ellos. A. como B. comes C. come D. comen choose D. but I'm not sure

    asked on January 21, 2016
  85. Math

    60 is 166 2/3% of what number? I got 36.14,is this correct?

    asked on October 9, 2015
  86. writing skills

    5. Which of the following is a complex sentence? A. I would like to visit the Kinshasa, but I understand the city is unsafe for foreigners. [B. As Jake was reading the letter from June yet again, the flight attendant coughed gently to get his attention.]

    asked on July 2, 2012
  87. Chemistry

    A solution of formic acid 0.20 M has a pH of 5.0. What is its Ka value? a) 5.0 x 10-10 b) 1.0 x 10-5 c) 5.0 x 10-5 d) 25

    asked on May 16, 2012
  88. Calculus

    The fuel efficiency, E, in litres per 100 km, for a car driven at speed v, in km/h is E(v)=1600v/(v^2+6400). a) Determine the legal speed speed that will maximize the fuel efficiency if the speed limit is 50 km/h. The answer is 50 km/h but my teacher said

    asked on March 4, 2012
  89. Math

    Explain how to do this with steps please. 1. Simplify cos(x-y)+cos(x+y)/cosx I did some of these so far, don't know if it is correct. Formula: cosxcosy= cos(x+y)+cos(x-y)/2 cos(x-y)+cos(x+y)/cosx =cosxcosy/2cosx

    asked on January 26, 2012
  90. Math

    If the diameter of a monster truck tire is 3.5 m and it makes one rotation every 5 seconds, how far does the tire roll in 1 minute? Diameter 3.5 radius: 3.5/2 = 1.75 12(2pi x 1.75) =131.9 m the book states that its 263.89 m? What did I do wrong?

    asked on January 19, 2012
  91. Chemistry

    What is the Cl concentration just as Ag2CrO4 begins to precipitate when 1.0 M AgNO3 is slowly added to a solution containing 0.015 M Cl and 0.015 M CrO4^2?

    asked on February 20, 2011
  92. chemistry

    I got E) for the first and couldn't figure out the other one. Can any one verify the first and help with the second?? In which of the following processes is there a decrease in the potential energy of the substances involved? A) a coil spring is compressed

    asked on January 13, 2011
  93. college chemistry

    Consider the following metals. Metal Specific Heat copper 0.385 J/(g · °C) magnesium 1.02 J/(g · °C) mercury 0.138 J/(g · °C) silver 0.237 J/(g · °C) lead 0.129 J/(g · °C) If the same amount of heat is added to 25.0 g of each of the metals, which

    asked on December 2, 2010
  94. chemistry

    We add excess NaCl solution (58.44 g/mol) to 64 mL of a solution of silver nitrate (AgNO3 169.88 g/mol), to form insoluble solid AgCl. When it has been dried and weighed, the mass of AgCl (143.32 g/mol) is found to be 1.91 grams. What is the molarity of

    asked on September 20, 2010
  95. college algebra

    f(x)=x^2+3; g(x)=x+4 find (fog)(-2) I have an answer of -7 or could this be just 7

    asked on April 23, 2010
  96. math

    divide 100 loaves of bread amoung 5 men so that the amounts are in arithmetic progression ( increase by the same amount each time) and the sum of the three largest shares is seven times the sum of the two smallest.

    asked on August 10, 2009
  97. Math

    Use the given graph of the function on the interval (0,8] to answer the following questions. Where does the function f have a local maximum? Answer (separate by commas): x= Where does the function f have a local minimum? What is the global maximum of f?

    asked on March 26, 2019
  98. MATH

    A rectangular prism has a length of 8 inches, a width of 5 inches, and a height of 2 inches. What is the volume of the prism? A. 15in2 B. 40in2 C. 80in2 D. 132in2

    asked on March 3, 2019
  99. Math

    What is the volume of a box that will hold exactly 567 cubes with 1/3 inch sides? I am somewhat confused on how to solve this. Please help.

    asked on February 22, 2019
  100. Chemistry

    Carbonic acid forms when carbon dioxide dissolves in water according to this equation: CO2+H2O =H2CO3 How many moles of CO2 must dissolve in an excess of water to produce 3 moles of H2CO3?

    asked on December 17, 2018


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