Most popular questions and responses by dee
  1. Chemistry

    Imagine two solutions with the same concentration and the same boiling point.? Imagine two solutions with the same concentration and the same boiling point, but one has ethanol as the solvent and the other has carbon tetrachloride as the solvent. Determine

    asked on March 2, 2013
  2. BUS math

    Bari Jay a gown manufacturer received an order for 600 prom dresses from China. Her cost is $35 a gown. If her markup based on selling price is 79%, what is the selling price of each gown? Round to the nearest cent.

    asked on March 31, 2015
  3. Chemistry

    A buffer solution is prepared by mixing 50.0 mL of 0.300 M NH3 with 50 mL of 0.300 NH4Cl. The pKb of NH3 is 4.74. NH3 + H2O-> NH4+ +OH- 7.50 mL of 0.125 M HCl is added to the 100 mL of the buffer solution. Calculate the concentration of NH3 and NH4Cl for

    asked on April 10, 2014
  4. Cal 1

    Verify the given linear approximation at a = 0. Then determine the values of x for which the linear approximation is accurate to within 0.1. (Enter your answer using interval notation. Round your answers to three decimal places.) (1 + 2x)^1/4 ≈ 1 + 1/2x

    asked on March 7, 2013
  5. chemistry

    Gaseous methane CH4 will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O . Suppose 0.481 g of methane is mixed with 2.9 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the

    asked on October 3, 2014
  6. Math

    If h is hours and n is the number of radios remaining, complete the equation: n= ____ x h = ____

    asked on January 20, 2016
  7. Physics

    Gas is confined in a tank at a pressure of 11 ATM and a temperature of 25 degree Celsius. If 2/3 of the gas is withdrawn and the temperature is raised to 75 degree Celsius, what is the new pressure in the tank?

    asked on November 26, 2011
  8. math

    The base of a solid is the region bounded by the parabola x^2 = 8y and y=4. Each cross section perpendicular to the y-axis is an equilateral triangle. Find the volume.

    asked on March 12, 2016
  9. Math

    Bill paints murals. He recorded the total amount of white paint that he used for his murals each month in the table below. In April Bill used 2/3 of the amount that housed in May. Fill in the amount of white paint BIll used in April in the table below.

    asked on April 1, 2017
  10. Chemistry

    Explain, in terms of electronegativity, why an H-F bond is expected to be more polar than an H-I bond.

    asked on January 4, 2011
  11. History

    12. What effect did technology have on World War I? It enabled nations to defeat their enemies with few casualties. It greatly increased the number of casualties.

    asked on November 13, 2015
  12. History

    Question 1 In the late nineteenth and early twentieth centuries, European nations formed alliances in order to __________. keep peace on the continent

    asked on November 13, 2015
  13. Math

    Suppose that Ramos contributes $6000/year into a traditional IRA earning interest at the rate of 2%/year compounded annually, every year after 35 until his retirement age at age 65. At the same time, his wife Vanessa deposits $4900/year into a Roth IRA

    asked on March 22, 2014
  14. Math/ Proportions solve using unit rates

    Contestants in a dance-a-thon rest for the same amount of time every hour. A couple rests for 25 minutes in 5 hours. How long did they rest in 8 hours? 25/5=5 8/5= 1 3/8 hours

    asked on November 11, 2015
  15. English

    What best describes Emily !@#$%^&inson's attitude towards death? A.sentimental B.angry C.accepting

    asked on November 19, 2015
  16. uah

    Assume you are performing the calibration step of Experiment 8 and you begin with 70 g of water at 20 oC and 70 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment,

    asked on March 8, 2010
  17. chemistry

    A major component of gasoline is octane (C8H18). When octane is burned in air it chemically reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). What mass of oxygen gas is consumed by the reaction of 8.17g of octane?.

    asked on December 4, 2016
  18. Math

    Lisa, Beth, and Tim painted their grandparent's house. • The amount of time Lisa painted can be represented by x. • The amount of time Beth painted is 1 3 5 times the amount Lisa painted • The amount of time Tim painted is 1 2 3 times the amount Lisa

    asked on October 30, 2018
  19. Math

    I run 1 3/4 miles each day. my friend runs 4 times as far as I do. how far does she run ?

    asked on February 23, 2017
  20. chemistry

    When disaccharide beta is hydrolyzed, which monosaccharide units are produced?

    asked on December 16, 2012
  21. Chemistry

    The vapor pressure of pure acetone (propanone) is 266 torr. When a non-volatile solute is added, the vapor pressure of acetone above the solution falls to 232 torr. What is the mole fraction of acetone in the solution? Show work. A) 0.69 B) 0.32 C) 0.13 D)

    asked on February 27, 2013
  22. Physics 2

    A 10 g bullet is fired into, and embeds itself in, a 2 kg block attached to a spring with a force constant of 19.6 n/m and whose mass is negligible. How far is the spring compressed if the bullet has a speed of 300 m/s just before it strikes the block and

    asked on January 20, 2012
  23. Chemistry

    A solution contains Cr3+ ion and Mg2+ ion. The addition of 1.00 L of 1.55M NaF solution is required to cause the complete precipitation of these ions as CrF3(s) and MgF2(s). The total mass of the precipitate is 49.9g .Find the mass of Cr3+ in the original

    asked on October 1, 2014
  24. physics

    The weight of an object is the same on two different planets. The mass of planet A is only forty-five percent that of planet B. Find the ratio rA/rB of the radii of the planets.

    asked on February 7, 2013
  25. Physics

    Two curves on a highway have the same radii. However, one is unbanked and the other is banked at an angle θ. A car can safely travel along the unbanked curve at a maximum speed v0 under conditions when the coefficient of static friction between the tires

    asked on March 4, 2013
  26. Math

    Please help me with the following. Write a word phrase to represent the numerical expression below. 5 + ( 17 - 8 )

    asked on December 5, 2017
  27. physics

    An object with mass m1=5.00 kg rests on a frictionless horizontal table and is connected to a cable that passes over a pulley and is then fastened to a hanging object with mass m2= 10.0 kg. Find the acceleration of each object and the tension in the cable.

    asked on September 26, 2011
  28. math

    find the image (0,0) after two reflections first across y=3 and then across X-axis

    asked on September 18, 2016
  29. Calculus

    At 2:00pm a car's speedometer reads 60mph, and at 2:10pm it reads 65mph. Use the Mean Value Theorem to find an acceleration the car must achieve. Answer( in mi/h2):

    asked on February 8, 2015
  30. math

    Anita's, a fast-food chain specializing in hot dogs and garlic fries, keeps track of the proportion of its customers who decide to eat in the restaurant (as opposed to ordering the food "to go"), so it can make decisions regarding the possible construction

    asked on June 11, 2017
  31. math

    monica keeps a supply of dimes and quarters in her car for highway tolls.A week's supply of toll coins contains 10 more dimes than quarters and totals $11.50. How many quarters does monica spend on highway tolls in one week? F. 26 G. 30 H. 36 I. 40

    asked on February 25, 2010
  32. Chemistry

    Explain how you would prepare 100.0 mL of 0.500 M NaCl solution. Include the appropriate glassware and calculations.

    asked on February 25, 2013
  33. Math

    Needing help with the formula to be able to prove these answers to be correct. What are the steps ? Moesha's is ( 3G + 1 ) years old and Shanti is twice Moesha's age. A ) Find the sum of the ages of Moesha's and Shanti in2 years time. Answer The sum of

    asked on December 6, 2017
  34. Math

    I have a 3 part question that I have the answers for but I am still having issues understanding it. Looking for help with the explanation / steps on how you would get the answer. Question 1) The width of a rectangular field is 3h yards and it's length is 3

    asked on December 6, 2017
  35. college algebra

    An isotope of lead, 201Pb, has a half-life of 8.4 hours. How many hours ago was there 40% more of the substance? (Round your answer to one decimal place.) ____hr

    asked on November 17, 2013
  36. College math HELP!!!!!

    A financier plans to invest up to $450,000 in two projects. Project A yields a return of 10% on the investment, whereas Project B yields a return of 15% on the investment. Because the investment in Project B is riskier than the investment in Project A, the

    asked on February 22, 2014
  37. Math

    An airplane in Australia is flying at a constant altitude of 2 miles and a constant speed of 600 miles per hour on a straight course that will take it directly over a kangaroo on the ground. How fast is the angle of elevation of the kangaroo's line of

    asked on February 1, 2015
  38. college finite math

    A product may be made using Machine I or Machine II. The manufacturer estimates that the monthly fixed costs of using Machine I are $17,000, whereas the monthly fixed costs of using Machine II are $14,000. The variable costs of manufacturing 1 unit of the

    asked on January 19, 2014
  39. Chemistry

    A solution is made by mixing 37.0 mL of ethanol, C2H6O, and 63.0 mL of water.? Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C? ethanol: 0.789 g/mL 43.9 torr water : 0.998 g/mL 17.5 torr

    asked on March 2, 2013
  40. Physics

    Starting from rest, a 5.00 kg block slides 2.50 m down a rough 30.0 degree incline. The coefficient of kinetic friction between block and the incline is .436. Determine the work done by the friction force between block and incline and the work done on the

    asked on October 12, 2011
  41. Geometry

    An unsharpened pencil is in the shape of a hexagonal prism, in which the face edge is 4 millimeters and the length is 170 millimeters. What is the lateral area of the pencil?

    asked on May 1, 2013
  42. Chemistry

    Isoamyl salicylate (м = 208.25 g/mol) has a pleasant aroma and is used in perfumes and soaps. Which of the following combinations gives a 0.75 m solution of isoamyl salicylate in ethyl alcohol (d = 0.7893 g/mL)

    asked on February 27, 2013
  43. chemistry

    If 8.00g of methane is burned with 6.00g of oxygen. How much methane,oxygen,carbon dioxide,and water remain after the reaction is complete in grams?

    asked on November 12, 2012
  44. geometry

    the measures of the interior angles of a pentagon are 2x, 6x, 4x-6, 2x-16 and 6x+2. What is the measure of the largest angle

    asked on April 26, 2010
  45. MATH


    asked on May 1, 2017
  46. Physics

    During volcanic eruptions, chunks of solid rock can be blasted out of the volcano; these projectiles are called volcanic bombs. (a) At what initial speed would a bomb have to be ejected, at angle 35degrees to the horizontal, from the vent at A in order to

    asked on December 28, 2015
  47. English

    In terms of style and technique, "Old Ironsides" is __________. distinctive and unique similar to many European poems

    asked on October 30, 2015
  48. Physics

    In a vacuum, two particles have charges of q1 and q2, where q1 = +3.7 µC. They are separated by a distance of 0.22 m, and particle 1 experiences an attractive force of 3.5 N. What is q2 (magnitude and sign)?

    asked on January 8, 2014
  49. Calculus

    Using f(x), determine a formula for the Riemann Sum S_n obtained by dividing the interval [0, 4] into n equal sub-intervals and using the right-hand endpoint for each c_k. f(x)= 5x+2 Now compute the limit as n goes to infinity S_n to compute the area under

    asked on April 7, 2014
  50. Physics

    The coefficient of static friction between the 3.00 kg crate and the 35.0 degree incline is .300. What minimum force must be applied to the crate from sliding down the incline?

    asked on September 28, 2011
  51. Chemistry

    Use the data from this table of thermodynamic properties to calculate the maximum amount of work that can be obtained from the combustion of 1.00 moles of ethane, CH3CH3(g), at 25 °C and standard conditions. I absolutely have no idea what to do, please

    asked on April 30, 2013
  52. physics

    A copper cube, 0.31 m on a side, is subjected to two shearing forces, each which has a magnitude F = 6.40 106 N (see the drawing). Find the angle θ (in degrees), which is one measure of how the shape of the block has been altered by shear deformation.

    asked on April 3, 2013
  53. Chemistry

    When disaccharide alpha is hydrolyzed, which monosaccharide units are produced? A) D-glucose and D-fructose monosaccharide units B) two D-fructose monosaccharide units C) two D-glucose monosaccharide units

    asked on December 16, 2012
  54. math

    Suppose the cost function associated with a product is C(x) = cx + F dollars and the revenue function is R(x) = sx, where c denotes the unit cost of production, s the unit selling price, F the fixed cost incurred by the firm, and x the level of production

    asked on May 7, 2011
  55. MATHS


    asked on May 1, 2017
  56. college finite math

    Cowling's Rule is a method for calculating pediatric drug dosages. If a denotes the adult dosage (in milligrams) and if t is the child's age (in years), then the child's dosage is given by D(t) = (t + 1/24)a (a) Show that D is a linear function of t. Hint:

    asked on January 19, 2014
  57. college algebra

    In 4 years, 30% of a radioactive element decays. Find its half-life. (Round your answer to one decimal place.) _____ yr

    asked on November 17, 2013
  58. science

    what is the mole ratio of C5H12-> C5H8 + 2H2?

    asked on March 9, 2011
  59. mat 116/algebra

    A cylinder has a radius of 5 in. If the volume of the cylinder is 250Ĉ in.3, what is the height of the cylinder? [Hint: The volume of a cylinder is given by V = Ĉr2h.] I think I wrote it wrong the first time. The volume of a cylinder is pi r^2 h.

    asked on May 13, 2007
  60. math

    The demand function for the Sicard wristwatch is given by the following function where d(x) (measured in units of a thousand) is the quantity demanded per week and x is the unit price in dollars. d(x) = 50 0.01x2 + 1 (0 ≤ x ≤ 20) (a) Find d'(x). d'(x)

    asked on February 6, 2015
  61. Chemistry

    The dosage of technetium -99m for a lung scan is 20 uci/ kg of body weight. How many millicuries should be given to a patient (1 mci=1000uci)

    asked on March 2, 2015
  62. Math

    An architect designs a house that is 12 m wide. The rafters holding up the roof are equal length and meet at an angle of 68°. The rafters extend 0.6 m beyond the supporting wall. How long are the rafters? Hi - I was wondering if you could help me with

    asked on August 21, 2011
  63. College Algebra

    A bank credit card charges interest at the rate of 23% per year, compounded monthly. If a senior in college charges $1,700 to pay for college expenses, and intends to pay it in one year, what will she have to pay?

    asked on October 28, 2013
  64. college math HELP!!!!!

    The quantity demanded x each month of Russo Espresso Makers is 250 when the unit price p is $180; the quantity demanded each month is 1000 when the unit price is $150. The suppliers will market 750 espresso makers if the unit price is $80. At a unit price

    asked on January 19, 2014
  65. English

    One way an English sonnet is different from a Petrarchan sonnet because an English sonnet contains A couplet < A sestet Give quatrains None of the above

    asked on January 4, 2017
  66. english

    According to !@#$%^&inson, what is the character of Nature? Nature divides people from each other Nature is intentionally heartless Nature offers inspiration and meaning A or probably B.

    asked on November 19, 2015
  67. Physics

    A ladder (L = 7.80 m) of weight WL = 360 N leans against a smooth vertical wall. The term "smooth" means that the wall can exert only a normal force directed perpendicular to the wall and cannot exert a frictional force parallel to it. A firefighter, whose

    asked on March 4, 2013
  68. Math

    How do you write the product as a product of a whole number and a unit fraction of 3×4/5 equals

    asked on February 23, 2017
  69. college finite math

    Cowling's Rule is a method for calculating pediatric drug dosages. If a denotes the adult dosage (in milligrams) and if t is the child's age (in years), then the child's dosage is given by D(t) = (t + 1/24)a (a) Show that D is a linear function of t. Hint:

    asked on January 19, 2014
  70. physics

    An electric heater used to boil small amounts of water consists of a 25-Ω coil that is immersed directly in the water. It operates from a 60-V socket. How much time is required for this heater to raise the temperature of 0.50 kg of water from 29° C to

    asked on January 27, 2014
  71. chemistry

    a piece of metallic iron (10 moles) was dissolved in concentrated hydrochloric acid. the reaction formed iron (II) chloride and hydrogen gas. how many moles of iron (II) chloride were formed?

    asked on March 26, 2014
  72. physics

    Two curves on a highway have the same radii. However, one is unbanked and the other is banked at an angle θ. A car can safely travel along the unbanked curve at a maximum speed v0 under conditions when the coefficient of static friction between the tires

    asked on February 28, 2013
  73. Geometry (check answer)

    Prove that the triangles with the given vertices are congruent. A(3, 1), B(4, 5), C(2, 3) D(-1, -3), E(-5, -4), F(-3, -2) a The triangle are congruent because triangle ABC can be mapped to triangle DEF by a rotation. (x,y)--->(y, -x) Followed by a

    asked on December 9, 2017
  74. math

    a rectangle has a length of 10 3/16 inches and a width of 6 7/8 inches. nwhat is the perimeter of the rectangle

    asked on May 29, 2013
  75. Finite Math

    Find the effective rate of interest corresponding to a nominal rate of 6%/year compounded annually, semiannually, quarterly, and monthly. (Round your answers to two decimal places.)

    asked on May 6, 2011
  76. Math

    Determine how much time is required for an investment to quadruple if interest is earned at a rate of 7.1% compounded continously. (no other info is given, and that's why I'm confused...)

    asked on May 31, 2010
  77. Math

    What ratio represents the probability of drawing a red card from a standard deck of 52 cards?

    asked on April 24, 2010
  78. geometry

    Find the weight to the nearest kg, of the cement block. Cement weighs 1700 kg/m3. 12cm x 10cm and 40cm x 20 cm x 20cm.

    asked on April 20, 2013
  79. us history

    "Although the economic growth of the United States between 1860 and 1900 has been attributed to a governmental policy of laissez-faire, it was in fact encouraged and sustained by direct government intervention." Assess the validity of this statement. What

    asked on January 13, 2011
  80. math

    1. Put these rational numbers in order from smallest to largest. 3/4= 0.75, 2/7=0.287, 2/10=0.2, 5/8= 0.66, 8/4=2 2/10, 2/7, 5/8, 3/4, 8/4 ? 2. Order the numbers from least to greatest. 1.5, 3.25, 1.66, 3.33, 2.4 A)1.5, 1.66, 2.4, 3.25, 3.33

    asked on October 29, 2015
  81. Algebra

    Kevin stuffs shrimp in his job as a seafood chef. He can stuff 1200 shrimp in 4 hours. When his sister helps him, they can stuff 1200 shrimp in 3 hours. If kevin gets sick, how long will it take his sister to stuff 600 shrimp?

    asked on September 5, 2013
  82. physics

    A rocket of mass 4.5 105 kg is in flight. Its thrust is directed at an angle of 45.5° above the horizontal and has a magnitude of 7.60 106 N. Find the magnitude and direction of the rockets acceleration. Give the direction as an angle above the horizonal.

    asked on February 7, 2013
  83. physics

    Imagine a landing carft approaching the surface of Callisto, one of Jupiture's moons. If the engine provides an upward force (thrust) of 3260 N, the craft descends at constant speed; if the engine provides only 2200 N the craft accelerates downward at .39

    asked on November 26, 2006
  84. Physics

    a cylinder of gas is at a room temp (20 c) the air conditioner breaks down and the tempture rises to 58c what is the new pressure of the gas relative to its initial pressure?

    asked on July 30, 2013
  85. social studies

    what kind of landform covers the central part of North America

    asked on September 26, 2010
  86. math

    Forty-eight sheep live on the farm. Thirty-six cows also live on the farm. What is the ratio of sheep to cows

    asked on April 25, 2017
  87. math

    an unbiased coin is tossed six times. find the probability of the given event. the coin lands heads more than once.

    asked on April 23, 2014
  88. Jewelry markings

    I have a diamond ring with the marks "KOBI 14K" inside. I know what the 14K stands for; but, what does the "KOBI" mean?

    asked on December 21, 2007
  89. physics

    Tarzan wights 820N, swings from a cliff at the end of a 20m vine that hangs from a high tree limb and initially makes an angle of 22 degrees with the vertical. Immediately after Tarzan steps off the cliff the tension in the cine is 760N. Choose a

    asked on November 25, 2006
  90. physics

    A navy jet with a weight of 231 kN requires an airspeed of 85 m/s for liftoff. The engine develops a maximum force of 107 kN, but that is insufficient for reaching takeoff speed in the 90 m runway available on an aircraft carrier. What minimum force

    asked on November 26, 2006
  91. Chemistry

    Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) ⇌ PCl3(g) + Cl2(g) A 0.304 mol sample of PCl5(g) is injected into an empty 4.75 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PCl3(g) at

    asked on April 2, 2013
  92. 12th grade american governmet

    Research Ronald Reagan especially with regards to their foreign policy and foreign involvement during their administration. Identify 3 aspects of their foreign policy or foreign events they involved the US with. for each of the events explain where on the

    asked on December 30, 2009
  93. Science

    In a wheelbarrow, you have 2 kilograms of soil for your garden. If 8 percent of it is organic matter( decayed materials from organisms), how many grams of organic matter do you have?

    asked on February 28, 2008
  94. college math

    CalJuice Company has decided to introduce three fruit juices made from blending two or more concentrates. These juices will be packaged in 2-qt (64-oz) cartons. One carton of pineapple-orange juice requires 8 oz each of pineapple and orange juice

    asked on February 23, 2014
  95. Physics

    The drawing shows a sulfur dioxide molecule. It consists of two oxygen atoms and a sulfur atom. A sulfur atom is twice as massive as an oxygen atom. Using this information and the data provided in the drawing, find (a) the x coordinate and (b) the y

    asked on April 1, 2013
  96. chemistry

    If Kf = 1.86C/m, how many grams of calcium chloride must be added to 1.0L of water (assume a density of 1.0 g/mL) to lower the freezing point 4.0 C?

    asked on March 2, 2013
  97. Finite Math

    Find the effective rate corresponding to the given nominal rate. (Round your answer to two decimal places.) 11%/year compounded semiannually

    asked on May 6, 2011
  98. Taxation

    "Sally W. Emanual had the following dividends and interest during the current year. Acorn Corporation bond interest $700 City of Boston bongs interest 1,000 Camp Bank interest 1,250 Jet Corporation dividend(Qualified) 1,300 North Mutual fund Capital gain

    asked on December 10, 2010
  99. Pure math, physical sciences, CAT, Business studie

    What careers will I have if I do those subjects

    asked on February 5, 2019
  100. Managerial Economics

    I am completely lost in working this problem. 1. The total operating avenues of a public transportation authority are$100 million while its operating costs are $120 million. The price of a ride is $1, and the price of elasticity of demand has been

    asked on November 7, 2015


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