barbara

Most popular questions and responses by barbara
  1. Math

    Make the following changes to the number 2.614. The 1 is worth one tenth as much. The 4 is worth 10 times as much The 2 is worth one tenth as much Make the 6 worth 10 times as much So I'm not sdure if my answer I'd 6.241 or .6241

    asked on December 16, 2015
  2. Statistics

    The closing price of Schnur Sporting Goods, Inc., common stock is uniformly distributed between $17 and 35 per share. What is the probability that the stock price will be: More than $31? Less than or equal to $23?

    asked on November 21, 2010
  3. 12th grade

    A particle starts at x=0 and moves along the x-axis with velocity v(t)=2t+1 for time t is less than or equal to 0. Where is the particle at t=4?

    asked on January 6, 2009
  4. calculus

    Find the dimensions of the largest open-top storage bin with a square base and vertical sides that can be made from 108ft^2 of sheet steel. (Neglect the thickness of the steel and assume that there is no waste)

    asked on January 3, 2009
  5. calculus

    The position of two particles on the s-axis are s1= cos(t) and s2= cos(t+(symbol for pie)/4) a. what is the farthest apart the particles ever get? b. when do the particles collide?

    asked on January 3, 2009
  6. algebra

    Find the distance, d,across the river. Assume that the ratio of d to 90ft is the same as the ratio of 100ft to 50ft

    asked on March 12, 2013
  7. Chemistry HELP!

    a) How would a too low molarity of NaOH affect the calculated molar mass of the unknown acid? b) How would it affect the calculated Ka of the unknown acid? If mistakenly calibrated pH meter using pH6 buffer instead of pH7 buffer, all ph meter readings were

    asked on April 13, 2011
  8. Chemistry

    Bromine is a reddish-brown liquid. Calculate its density (g/mL) if 586g of the substance occupies 188 mL.

    asked on January 21, 2015
  9. physics

    At the local grocery store, you push a 14.0-kg shopping cart. You stop for a moment to add a bag of dog food to your cart. With a force of 12.0N, you now accelerate the cart from rest through a distance of 2.30m in 2.55s. What was the mass of the dog food?

    asked on February 20, 2015
  10. Calculus

    Find the indefinite integral (integral sign) 3te^2tdt

    asked on February 16, 2009
  11. Physics

    Two hockey players on ice skates push off of each other. One has a mass of 60 kilograms. The other has a mass of 80 kilograms. What is the 60-kilogram player’s momentum?

    asked on November 8, 2017
  12. Chem 121

    How many grams of NaOH are present in 9.0 mL of a 8.0% (m/v) NaOH solution

    asked on July 26, 2011
  13. math

    Alex lives 500 yards from the park.How many inches does Alex live from the park ?

    asked on April 8, 2019
  14. statistics

    Assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of $2,225 per hour and a standard deviation of $220. What is the operating cost for the lowest 5 percent of the airplanes?

    asked on November 21, 2010
  15. Chem 121

    A solution is made by dissolving 0.35 mole of LiI in enough water to give a final volume of 260.0 mL. What is the molarity of the solution?

    asked on July 26, 2011
  16. Physicsl Science

    A cart on a linear track has a uniform acceleration of 0.172 m/s^2. What is the velocity of the cart 4.00 s after it is released from rest?

    asked on September 8, 2014
  17. chemistry

    How many grams of AgNo3 are required to make 25 mL of a .80M solution?

    asked on December 10, 2010
  18. Chemistry HELP!

    a) How would a too low molarity of NaOH affect the calculated molar mass of the unknown acid? b) How would it affect the calculated Ka of the unknown acid? If mistakenly calibrated pH meter using pH6 buffer instead of pH7 buffer, all ph meter readings were

    asked on April 13, 2011
  19. statistics

    Of 1735 people who came into a blood bank to give blood, 373 people had high blood pressure. Estimate the probability that the next person who comes in to give blood will have high blood pressure.

    asked on February 17, 2012
  20. Math

    A college class with 30 sophomores, 18 juniors, and 12 seniors is divided into project groups where each group has the same number of sophomores, juniors, and seniors. What is the greatest number of groups that can be formed? How many sophomores, juniors,

    asked on December 4, 2016
  21. math

    Janice walked around two sides of a square park. The perimeter of the park is 1,200 yards. How many yards did Janice walk? Explain your answer.

    asked on April 7, 2015
  22. algebra

    Find all points on the x-axis that are 10 units from the point (7, 6). (Hint: First write the distance formula with (7, 6) as one of the points and (x, 0) as the other point.)

    asked on October 12, 2014
  23. Physicsl Science

    A heat pump releases 103.0 kcal as it removes 54.0 kcal at the evaporator coils. how much work does this heat pump ideally accomplish? Answer should be in KJ

    asked on September 17, 2014
  24. calculus

    1. Estimating the Temperature of a Yam Suppose you put a yam in a hot oven, maintained at a constant temperature of 200C. As the yam picks up heat from the oven, its temperature rises.16 (a) Draw a possible graph of the temperature T of the yam against

    asked on August 27, 2014
  25. Physical Science

    Why does a glass filled with a cold beverage seem to sweat? a. saturation always results in sweat on wet object. b. the cold glass adjacent air to saturation, which is followed by condensation of water vapor. c. when cold, water molecules can move through

    asked on September 15, 2014
  26. Math

    During a semester, a student received scores of 76, 80, 83, 71, 80, and 78 on six tests. What is the student's average score for these six tests?

    asked on August 9, 2013
  27. physics

    A ball is thrown straight up with enough speed so that it is in the air for several seconds. Assume the positive direction is upwards. What is its velocity 1.5s before it reaches its highest point?What is the change in its velocity, v, during this 1.5-s

    asked on February 14, 2017
  28. algebra

    The vendor of a coffee cart mixes coffee beans that cost $8 per pound with coffee beans that cost $4 per pound. How many pounds of each sould be used to make a 60-pound blend that sells for $5.25 per pound?

    asked on September 26, 2014
  29. Chemistry

    2C2H6 +7O2 --> 4CO2 + 6H2O If 6 moles of O2 are used in the following reaction, how many grams of CO2 will be produced?

    asked on April 15, 2011
  30. Penn foster

    Which of the following sentences demonstrates the correct use of capitalizing direction words? The Northeast has been hit with an unusually cold winter. Poor Alex thought he was driving West. i live just South of Scranton. Are you heading East

    asked on January 27, 2016
  31. algebra

    A bus was purchased for $70,000, assuming the bus depreciates at a rate of $6,000 per year(straight line depreciation) for the first 10 years, write the value v of the bus as a function of the time t (measured in years) for 0 < t < 10

    asked on December 11, 2014
  32. statistics

    You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on the 90 percent confidence level and state that the estimated proportion must be within 2 percent of the population proportion. A pilot survey reveals

    asked on October 9, 2011
  33. Chem 141

    Write the three thermochemical equations needed to calculate the delta H for the below reaction.? 2Mg(s) + O2(g) --------> 2 MgO(s) delta H rxn = ? (Include delta H values in kJ for each reaction)

    asked on November 17, 2010
  34. algebra

    A new machine that deposits cement for a road requires 13 hours to complete a one-half mile section of road. An older machine requires 15 hours to pave the same amount of road. After depositing cement for 2 hours, the new machine develops a mechanical

    asked on September 10, 2014
  35. Public Finance

    Suppose the marginal social cost of television sets is $100. This is constant and equal to the average cost of television sets. The annual demand for television sets is given by the following equation: Q = 200,000 – 500P2. If television sets are sold in

    asked on September 21, 2010
  36. english

    i need to know what are the simile's,metaphors, and personifications in A SUMMER lOVE POEM BY NIKKI GIOVANNI CLOUDS FLOAT BY ON A SUMMER SKY I HOP SCOTCH OVER YOU RAINBOWS ARCH FROM GROUND TO GOLD I CLIMB OVER YOU THUNDER GRUMBLES, LIGHTNING TUMLES AND I

    asked on November 16, 2015
  37. Physical Science

    A heat pump releases 103.0 kcal as it removes 54.0 kcal at the evaporator coils. How much work does this heat pump ideally accomplish? The answer should be in KJ

    asked on September 18, 2014
  38. algebra

    A triangle has a perimeter of 56 centimeters. Each of the two longer sides of the triangle is three times as long as the shortest side. Find the length of each side of the triangle

    asked on September 10, 2014
  39. algebra

    It costs a manufacturer $7.95 to produce sunglasses that sell for $21.99. How many pairs of sunglasses must the manufacturer sell to make a profit of $10,530? 1 pairs of sunglasses

    asked on September 10, 2014
  40. science

    If a 0.5 L container of juice contains 15 g of sugar, what's the concentration of sugar? A. 30 g/L B. 3.33 g/L C. 45 g/L D. 7.5 g/L I think b

    asked on May 26, 2014
  41. Statistics

    8. A sample of 65 observations is selected from one population. The sample mean is 2.67 and the sample standard deviation is .75. A sample of 50 observations is selected from a second population. The sample mean is 2.59 and the sample standard deviation is

    asked on February 28, 2010
  42. calculus

    This is my last question, when I usually get problems like this the volume would be there and I would be able to solve it but this question is very confusing. A spherical iron ball is coated with a layer of ice of uniform thickness. If the ice melts at the

    asked on January 3, 2009
  43. Physical Science

    A lamp bulb is rated 100w. Why is a time factor not included in the rating?

    asked on September 9, 2014
  44. calculus

    Each page of a book will contain 30 in squared of print, and each page must have 2 inch margins at top and bottom and 1 inch margin at each side. What is the minimum possible area of such a page.

    asked on November 1, 2011
  45. math

    the price of a computer fell 20% this year, if the computer now cost $850, how much did it cost last year?

    asked on September 26, 2014
  46. algebra

    a triangle has a perimeter of 126 centimeters, each of the 2 longer sides of the triangle is three times as long as the shortest side. Find the length of each side of the triangle.

    asked on September 26, 2014
  47. math

    The price of a computer fell 20% this year. If the computer now costs $550, how much did it cost last year

    asked on September 10, 2014
  48. science

    How do i calculate how much time it takes to heat water? All I know is the power supplied and the energy required. Thanks power= energy/time Power*time= energy you know the energy, you know the power, solve for time. time(in seconds)=

    asked on January 16, 2007
  49. algebra

    A triangle has a perimeter of 112 centimeters, each of the two longer sides of the triangle is three times as long as the shortest side. Find the length of each side of the triangle

    asked on December 11, 2014
  50. math

    An investment adviser invested $14,000 in two accounts. One investment earned 4% annual simple interest, and the other investment earned 2.5% annual simple interest. The amount of interest earned for 1 year was $458. How much was invested in each account?

    asked on September 11, 2014
  51. algebra

    A jeweler wants to make a silver alloy to be used to make necklaces. How many ounces of a silver alloy that costs $3.50 per ounce should be mixed with one that costs $7.00 per ounce to make a new 30-ounce alloy that costs $6.30 per ounce

    asked on September 10, 2014
  52. interpersonal communications

    because words have human senders and receivers, they also have multiple intentions and interpretations. True or False

    asked on November 4, 2013
  53. Chemistry-Stoichiometry

    what is the limiting reactant if 0.10 moles Fe and 0.16 moles O2 react according to the reaction 4Fe +3O2 -> 2Fe2O3?

    asked on October 19, 2013
  54. communication

    How does language allow self reflecting, organize perceptions, allow hypothetical thought

    asked on November 12, 2012
  55. math

    Jen, I will attempt to write the others out. #3)ADD: -57 + (-22) I got -79 #4)Subtract -2.3-(-8.8) I got -6.5 #7)perform indicated operation: -21 - (-9) I tried to underline ----------- -21 - (-21) I got -12 over o or undfined #8)Multiply:(4){-3/2} This

    asked on July 18, 2010
  56. math

    Please help. the question is: Estimate the quotient. Tell what compatible numbers you used 817 divided by 4

    asked on January 15, 2009
  57. algebra

    A boat was purchased for $45,000. Assuming the boat depreciates at a rate of $4700 per year (straight-line depreciation) for the first 8 years, write the value v of the boat as a function of the time t (measured in years) for 0 ¡Ü t ¡Ü 8. v(t) = ____,

    asked on October 18, 2014
  58. -Math-Desperate

    An investment adviser invested $14,000 in two accounts. One investment earned 4% annual simple interest, and the other investment earned 2.5% annual simple interest. The amount of interest earned for 1 year was $458. How much was invested in each account?

    asked on September 12, 2014
  59. math

    A new machine that deposits cement for a road requires 13 hours to complete a one-half mile section of road. An older machine requires 15 hours to pave the same amount of road. After depositing cement for 2 hours, the new machine develops a mechanical

    asked on September 11, 2014
  60. grammar

    "there are no bruits auscultated - are bruits and auscultated nouns,pronouns etc?

    asked on July 30, 2014
  61. college physics

    a railway freightbcar whose mass is 15 000kg & speed is 2.4m/s runs into a stationary freight car whose mass is 25 000kg. the 2 cars couple & roll off the track. what is the speed if the 2 cars as tey move together down the track? and how much kinetic

    asked on November 29, 2011
  62. statistics

    A normal population has a mean of 21 and a standard deviation of 5. Compute the z value associated with 24 What proportion of the population is between 21 and 24? What proportion of the population is less than 18?

    asked on November 21, 2010
  63. business 155-excel

    Can you describe some situations in which you would have liked to exchange information between Excel and some other applications? What are these applications, and why was such an exchange desirable? How might such exchanges make your work faster, more

    asked on May 17, 2010
  64. statistics

    7. A sample of 40 observations is selected from one population. The sample mean is 102 and the sample standard deviation is 5. A sample of 50 observations is selected from a second population. The sample mean is 99 and the sample standard deviation is 6.

    asked on February 28, 2010
  65. statistics

    Please analyze the following data using the T-test for Unpaired data: A school district wants to determine if the girls are equal to boys in test scores. They took a random sample of 22 8th grade girls and 24 8th grade boys. The district looked at recent

    asked on February 28, 2010
  66. teaching math

    Indicate whether the deductive reasoning used is an example of affirming the hypothesis or denying the conclusion. If a number is divisible by 3, then the sum of the digits of that number is divisible by 3. The sum of the digits of a number is not

    asked on June 6, 2009
  67. math

    Mrs, jones is having a pizza party for 19 students. each pizza will be cut in 6 slices. how many pizzas will Mrs jones need to order?

    asked on November 25, 2016
  68. Physics

    A ball is thrown straight up at a launch velocity of 15m/s. What is the velocity when it returns to the throwers hand?

    asked on January 24, 2016
  69. Math

    find the angle θ in the right triangle in the following problem. Round to the nearest degree, if necessary. cos θ = 0.8192 A = 45 H = ?

    asked on May 23, 2015
  70. math

    A salesperson earned 33,250 on annual sales of 950,000. What is her rate of commission.

    asked on April 18, 2015
  71. Physics

    A plane diving with constant speed at an angle of 52.5° with the vertical, releases a package at an altitude of 499 m. The package hits the ground 3.87 s after release. How far horizontally does the package travel?

    asked on January 27, 2015
  72. math

    A medical researcher wanted to determine the effect of pH (a measure of alkalinity or acidity, with pure water having a pH of 7) on the growth of a bacteria culture. The table below gives the measurements of different cultures, in thousands of bacteria,

    asked on December 6, 2014
  73. algebra

    A bus was purchased for $80,000. Assuming the bus depreciates at a rate of $6,000 per year (straight-line depreciation) for the first 10 years, write the value v of the bus as a function of the time t (measured in years) for 0 ¡Ü t ¡Ü 10. v(t)= ____

    asked on October 18, 2014
  74. math

    A plane leaves Chicago headed for Los Angeles at 520 mph. One hour later, a second plane leaves Los Angeles headed for Chicago at 620 mph. If the air route from Chicago to Los Angeles is 1800 miles, how long will it take (after the first plane takes off)

    asked on September 11, 2014
  75. math

    A new machine that deposits cement for a road requires 13 hours to complete a one-half mile section of road. An older machine requires 15 hours to pave the same amount of road. After depositing cement for 2 hours, the new machine develops a mechanical

    asked on September 10, 2014
  76. algebra

    It costs a manufacturer $7.95 to produce sunglasses that sell for $21.99. How many pairs of sunglasses must the manufacturer sell to make a profit of $10,530

    asked on September 10, 2014
  77. algebra

    An investment adviser invested $14,000 in two accounts. One investment earned 4% annual simple interest, and the other investment earned 2.5% annual simple interest. The amount of interest earned for 1 year was $458. How much was invested in each account?

    asked on September 10, 2014
  78. Physical Science

    If one measurement is known much more precisely than the other, the fractional error is the ratio of the absolute value of the difference (|M1-M2|), and the more accurate value. What is the percentage error of student A's measurement (37.2 cm long if it is

    asked on August 25, 2014
  79. Reading

    Except for a few pigeons, Central Park was deserted. Mist hung above the chilled grass. Patches of old snow, scattered here and there, looked like white puddles. The sun hung just above the horizon, casting red and orange streaks across low-hanging clouds.

    asked on June 12, 2014
  80. Math

    Tanya had $1.19 in coins none of the coins were dollars or 50-cents pieces.Josie asked Tanya for change for a dollar, but she did not have the correct chang.Which coins did Tanya have?

    asked on January 9, 2013
  81. HCR 210

    Select an accreditation agency and name an area of records management that is affected by its guidelines. How does accreditation affect the practical activities of record management in hospitals?

    asked on June 3, 2012
  82. calculus

    An oil can is to have a volume 1000in^3 and is to be shaped like a sylinder with a flat bottom but capped by a hemisphere. Neglect the thickness of the material of the can and find the dimensions that will minimize the total amount of material needed to

    asked on November 5, 2011
  83. Chemistry

    Zn + HCl --> ZnCl2 + H2 If 18 grams of Zn are used in the following reaction, how many grams of H2 will be produced?

    asked on April 15, 2011
  84. Statistics

    For each of the following samples that were given an experimental treatment, test whether these samples represent populations that are different from the general population: A. a sample of 10 with a mean of 44. B.a sample of 1 with a mean of 48. The

    asked on November 15, 2010
  85. science

    Napolweon pencil has a mass of 3 grams (0.27Napoleon ) when he lifts his pencil from the desk to his paper he moves it an average of 20cm (o.20m) He then returns it to his desk moving it another 20cm How much work did he do on his pencil? w=FXD

    asked on October 24, 2009
  86. marketing

    You are working in the product development department of a company that creates household products. Your team has come up with an idea for a revolutionary new cleaning product. Using the seven phases of new product development as a guide, describe how your

    asked on July 24, 2009
  87. teaching math

    Indicate whether the deductive reasoning used is an example of affirming the hypothesis or denying the conclusion. If a number is divisible by 3, then the sum of the digits of that number is divisible by 3. The sum of the digits of a number is not

    asked on June 6, 2009
  88. Buiness

    The Excel file contains a WBS for a proposal to implement a PMO. Convert the WBS into a project plan. WBS for PMO Quick Start-Up Effort and Schedule (Estimates and Actual) Tasks to be Performed Actual Hours Estimated Hours Actual (Week-wise) Plan

    asked on July 26, 2008
  89. math

    help my daughter has a math problem and came to me for help, I am lost.... what is the gcf for the following trinomial? x^3-18x^2+28x I am assumming you are trying to factorise we can simply take out an x to give: x(x^2-18x+28) the quadratic will not

    asked on February 22, 2007
  90. Math

    I need help with this.The question is Fedinand has a rectangular square garden.The garden is 7 1/2 feet wide.The area of the garden is 150 square feet.What is the length of Ferdinand's garden?Write the division needed for this problem.Do not solve.

    asked on April 2, 2017
  91. common core math

    22+49

    asked on October 26, 2016
  92. Early childhood education

    Consider these two sentences from Michaela: A) Age 4 years: "I miss you, Nana!" (spoken over the phone to her grandmother who had returned home after a visit). B) Age 4 years, 6 months: "I'm going to miss you, Nana" (spoken in person to her grandmother who

    asked on March 6, 2015
  93. algebra

    a car rents for $45 per day plus 21 cents per mile you are on a daily budget of $66 what milage will call you to stay within your budget

    asked on January 18, 2015
  94. math

    A = P + Prt; P (business)

    asked on September 10, 2014
  95. help please

    Cosmetic surgery is more likely to lead to disappointment if a person is ________. A. Seeking surgery with the hope of influencing a change in oneself B. Seeking surgery with the hope of influencing a change in someone else C. Seeking surgery with the hope

    asked on July 4, 2013
  96. math

    What would 350 dollars at 5 % compounded semi annually for 40 years amount to?

    asked on January 17, 2013
  97. math for business and finance

    !@#$%^& hercher borrowed $7,000 to travel to london. his loan is to be paid in 48 monthly installments of $190. at the end of 14 months, !@#$%^& decides to pay off his loan. what is the final payoff !@#$%^& will make?

    asked on January 8, 2013
  98. Physics

    if rock A is dropped from a cliff and rock B is thrown downward off the cliff, which of the two has a greater velocity?

    asked on October 21, 2012
  99. history

    What incident abroad marked the election day of the 1956 election, thereby enhancing Eisenhower's bid for a second term? A. The crisis in the Formosa Straits B. The French defeat in Indochina C. An attack on U.S. Marines in Beirut D. The resolution of the

    asked on October 3, 2012
  100. Bus Stat

    Statistics: Many track hurdlers believe that starting in the inside lane closest to the field has better chance of winning. closest to the field is lane 1, nxt is lane 2, etc until Lane 6. find the critical value x20 to test the claim that the

    asked on June 3, 2012

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