Questions Asked on
May 5, 2011

  1. Chemistry

    You have 100.0 mL of 0.2500 M solution of NaCl sitting in a beaker. After several days you test the solution and find out that it is now 0.3721M. How much water must have evaporated?? I got 67.2 mL but its the wrong answer.. PLS HELP!

  2. Chemistry

    Balance in an acidic solution: S2O3^2- +OCL =CL^- +S4O6^2-

  3. calculus

    the volume of a rectangular box with a square base remains constant at 500 cm^3 as the area of the box increases at a rate of 3cm^2/sec. find the rate at which the height of the box is decreasing when each side of the base is 18 cm long.

  4. trig

    ABC is rightangled triangle. AD is the bisector of angle BAC. Angle DAC=15 degrees. X=CD. Find X. I know the answer is 7.1 but do not know how to do the actual sum. Can you please help AB = 23 CM

  5. Calculus-rates

    1.) A man 6 ft tall walks at a rate of 5 ft per sec. from a light that is 15 ft above the ground. At what rate is the top of his shadow changing? 2.) An airplane flies at an altitude of 5 miles toward a point directly over an observer. The speed of the

  6. finance

    Assume that the export price of a Nissan XTerra from Osaka, Japan is ¥3,750,000. The exchange rate is ¥121.84/$. The forecast rate of inflation in the United States is 2.8% per year and is 0.6% in Japan. a. What is the export price of the XTerra at the

  7. Chemistry

    Magnesium metal reacts with hydrochloric acid to form magnesium chloride and hydrogen gas. Suppose we react an excess of magnesium metal with 13.2 mL of a 3.00 M solution of hydrochloric acid and collect all of the hydrogen in a balloon at 25oC and 1.00

  8. physics

    You are moving at 120 km/h toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?

  9. Mathematics

    What is the perimeter of a triangle of length 6cm, 8cm, 10cm?

  10. College Algebra Application

    Newton's Law of Cooling T(t)=T0+(T1-T0)e^-kt The police discover the body of a murder victim. Critical to solving the crime is determining when the murder was committed. The coroner arrives at the murder scene at 12:00pm. She immediately takes the

  11. chemistry

    ratio of lone pair on surrounding atom to central atom in Xeo2F2?

  12. Math

    A man has 2 pennies, 3 nickels, 1 dime and 2 quarters. How many different sums of money can he make using one or more of these 8 coins?

  13. Math

    2 apples weigh the same as a banana and a cherry.A banana weighs the same as nine cherries.How many cherries weigh the same as one apple

  14. Algebra

    A sack contains yellow marbles and black marbles. If one marble is drawn at random, the probability that it is yellow is 7/8. Six yellow marbles are added to the sack. Now, if one marble is drawn, the probability that it is yellow is 9/10. How many yellow

  15. chemistry

    Calculate the amount of heat released when 100 kg of water freezes at 0 degrees celius. Delta H fusion= 6.03 kJ\mol

  16. physics

    The bulk modulus of water is B = 2.2 x 109 N/m2. What change in pressure ÄP (in atmospheres) is required to keep water from expanding when it is heated from 11.2 °C to 38.8 °C?

  17. Chemistry

    Calculate the average mass, in grams, of an iron atom.

  18. Chemistry (really need quick help)

    Balance the following equations. (Use the lowest possible coefficients. These may be zero.) (a) As(s) + ClO3-(aq) ---> H3AsO3(aq) + HClO(aq) (acidic solution) I am using half-reactions but I don't really get this at all. Can someone explain?

  19. chemistry

    Question: When a pink aqueous solution of potassium permanganate, faintly acidified with dilute sulfuric acid was treated with 10% aq. hydrogen peroxide, the reaction took place with the evolution of gas bubbles, and the pink solution was turned colorless.

  20. Algebra

    x^2 + kx - 19 Find all values of k so that each polynomial can be factored using integers.

  21. Chemistry

    Methyl alcohol (wood alcohol), CH3OH, is produced via the reaction CO(g) + 2 H2(g) à CH3OH(l) A mixture of 1.20 g H2(g) and 7.45 g CO(g) are allowed to react. 4 points (a) Which reagent is the limiting reagent? (b) What is the yield of CH3OH? [Assume

  22. finance

    Farah Jeans of San Antonio, Texas is completing a new assembly plant near Guatemala City. A final construction payment of Q8,400,000 is due in six months [“Q” is the symbol for Guatemalan quetzals]. Farah uses 20% per annum as its weighted average cost

  23. finance

    A Canadian exporter, Victoria Exports, will be receiving six payments of €10,000, ranging from now to 12 months in the future. Since the company keeps cash balances in both Canadian dollars and US dollars, it can choose which currency to change the euros

  24. math

    A spherical balloon with radius r inches has volume V (r) = 4 3  r3 . Find the function f(r) that represents the amount of air required to inflate the balloon from a radius of r inches to a radius of r + 2 inches.

  25. chem

    Ascorbic acid, H2C6H6O6, is a diprotic acide with a K1= 7.9 E-5 and a K2=1.6E-12. In a .005 M aq solution of ascorbic acid which of the following species is present in the lowest concentration. 1. H2O 2. H3O+ 3. H2C6H6O6 4. HC6H6O6- 5. C6H6O6-2

  26. ENGLISH 1

    I had to read the story and answer the questionss.. correct my answers? possibly mrs. sue! :D Epic from The Odyssey by Homer, translated by Robert Fitzgerald Two nights, two days, in the solid deep-sea swell he drifted, many times awaiting death, until

  27. Chemistry

    compared to an ordinary chemical reaction, a fission reaction will 1 release smaller amounts of energy 2 release larger amounts of energy 3 absorb smaller amounts of energy 4 absorb larger amounts of energy is it 2 ?

  28. algebra

    7x + 3y = 42 graph this equation using the intercepts method graph this equation using the intercepts method

  29. geometry

    Find the value of x if m arc adc=5(x-3) and angle abc=165 degrees.

  30. Chemistry

    Calculate the molar hydroxide ion concentration of each of the following solutions given the pH: pH=0.90 AND pH=1.62 I know to covert from ph to hydroxide but i'm having a problem going from hydroxide to ph..can someone please help me..thanks

  31. physics

    A sound wave has a frequency of 707 Hz in air and a wavelength of 0.50 m. What is the temperature of the air?

  32. math

    Find the area of a rhombus with a perimeter of 20 meters and a diagonal of 8 meters

  33. Physics

    Halley’s comet orbits the Sun with a period of 76.2 years. a) Find the semi-major axis of the orbit of Halley’s comet in astronomical units (1 AU is equal to the semi-major axis of the Earth’s orbit Physics - drwls, Thursday, May 5, 2011 at 8:51am

  34. Chemistry

    Calculate the mass percent (m/m) for the solute in 2 grams of KOH in 20.0 grams of H2O? How do I set this up?

  35. chemistry

    how would you make one gram potassium chloride with barium chloride and potassium carbonate

  36. Chemistry

    If 609.5 grams of vanadium (II) oxide, VO, and 832 grams of iron(III) oxide, Fe2O3, are put into a container and allowed to react according to the equation above, which substance(s) and how many grams of each would be present in the container after the

  37. MATH

    You purchased 150 ft. of chain that normally sells for $0.15 per inch. You were charged $22.50 for the sale. Was the price correct? If not, what is the correct price and what mistake was made?

  38. Chem

    Assign an oxidation state to each atom in each of the following compounds. Fe(CN)3 Fe: 3+ (i know this is correct) C N im not sure about the other two

  39. chemistry

    When hydrochloric acid reacts with zinc metal, zinc chloride and hydrogen gas are produced. How many moles of hydrochloric acid are needed to react with 2.3 moles of zinc?

  40. Maths

    How can answer this question ,help please? Information: A ship travels at a constant speed of 25 kilometres per hour (Kph) in a straight line from port A located at position (x_A, y_A) =(-100, -100) to port B at (x_B ,y_B )=(300 ,100) During its journey

  41. chemistry

    When hydrochloric acid reacts with zinc metal, zinc chloride and hydrogen gas are produced. How many moles of hydrochloric acid are needed to react with 2.3 moles of zinc?

  42. Algebra

    Use the function below to answer the following parts. f(x) = 1/3x - 4 if -6 ¡Ü x < ¨C 3 2 if ¨C 3 < x < 3 x^2 ¨C 4 if x > 3 I know that: Domain= [-6,infinity] Range= [-6,infinity] and points of discontinuity = x=-3,x=3 How do i graph these functions?

  43. algebra

    A number cube is rolled three times. What is the probability of rolling a 5 at least once?

  44. AP US History Exam

    Is it worth it to study for the AP US HIstory or AP European history exams the night before, or should I just get a lot of sleep and eat breakfast?

  45. Finance

    Dzell Printers, Inc. (DZ) of the United States exports computer printers to Brazil, whose currency, the reais (symbol R$) has been trading at R$3.30/US$. Exports to Brazil are currently 100,000 printers per year at the reais equivalent of $140 each. A

  46. Math - Ellipses

    Foci (0,-3)(0,3) Vertices (0,-4)(0,4) Find the standard form

  47. Science

    A pressure of 2 KPa is acting on a gas with a volume of 60 liters. If the pressure decreases to 1 kPa, what volume will the gas occupy?

  48. physics

    what is the diameter of a 1.00 m length of tungsten wire whose resistance is 0.22 ohms?

  49. Physics

    Suppose you wish to visit a star which is 450 light years away, and that you want your 21000 kg rocket to move so fast that you only age 20 years during the round trip. a. How fast must the rocket travel relative to the Earth? Give your answer as the

  50. algebra 2!

    Given f(X)=the square root of x-2 and g(x_=6/x-3 (+1), write the composite function g(f(x)) and state its domain. Where is the resulting function defined?

  51. Chemistry

    Calculate the pH of a solution that is made by mixing 10.00 mL of 0.2500 M HCl with 35.00 mL of .1500 M HNO3 and diluting the mixture to a total volume of 100.00 mL

  52. latin

    The most significant reason for the decline of the Latin Grammar School was that it:

  53. geometry

    find the measure in degrees of the total of 1 and 2 in square

  54. earth

    Atmosphere Homework! 1.Which of the following layers of the atmosphere is closest to space? 2.A barometer measures? 3. The atmosphere contains tiny solid particles called what? 4.The process by which the atmosphere slows Earth's loss of heat to space is

  55. Chemistry

    A sample of gas is in a 50.0mL container at a pressure of 86 kPa and a temperature of 25°C. The entire sample is heated to a temperature of 35°C and transferred to a new container whose volume is 65.0mL. The pressure of the gas in the second container

  56. trig

    ABC is rightangled triangle. AD is the bisector of angle BAC. Angle DAC=15 degrees. X=CD. Find X. I know the answer is 7.1 but do not know how to do the actual sum. Can you please help.

  57. Help Evaluating Integrals

    1.) ∫ (2)/(x-4) dx 2.) ∫ sec^2x tanx dx 3.) ∫ 2 csc^2 xdx 4.) ∫ (3) / sqtr(x+3) dx 5.) ∫ (2x-1) / (x^2 - x)

  58. Chemistry

    Calcium carbonate, CaCO3(s), decomposes upon heating to give CaO(s) and CO2(g). A sample of CaCO3 is decomposed, and carbon dioxide is collected in a 250 mL flask. After decomposition is complete, the gas has a pressure of 1.3 atm at a temperature of

  59. economics

    Explain the effect on a company’s stock price today of the following events, other things held constant. a. the interest rate on the company’s bonds falls. b. Several companies in the same sector announce surprisingly slow sales. c. Changes in the tax

  60. Hspanic Literature

    Need someone to proofread a college papaer for a Spanish Literature graduate class... anyone interested>

  61. physics

    A solid aluminum sphere has a radius of 2.28 m and a temperature of 89.1 °C. The sphere is then completely immersed in a pool of water whose temperature is 11.9 °C. The sphere cools, while the water temperature remains nearly at 11.9 °C, because the

  62. IT Technology

    What were the examples of database technology and how would they help with information policies?

  63. physics

    A solid aluminum sphere has a radius of 2.28 m and a temperature of 89.1 °C. The sphere is then completely immersed in a pool of water whose temperature is 11.9 °C. The sphere cools, while the water temperature remains nearly at 11.9 °C, because the

  64. Algebra

    Im having a hard time figuring out this problem: Use the function, y=-(x+1)^2 +2, to answer the following parts. The increasing interval and decreasing interval To find both I believe that: increasing : x < -1 decreasing : x > 1 So is this on solution

  65. Math

    Find the first five terms of each sequence, defined by the given rule. An=6N-2

  66. physics

    At a fabrication plant, a hot metal forging has a mass of 78.5 kg and a specific heat capacity of 426 J/(kg C°). To harden it, the forging is quenched by immersion in 788 kg of oil that has a temperature of 30.3 °C and a specific heat capacity of 2770

  67. physics

    When combined together, what is the weight (NOT MASS) of the moving pucks?

  68. free verse poems please

    i need really good examples of free verse poems please

  69. Law

    Explain how common laws and precedents come into being.

  70. physics

    find the maximum voltage that can be applied to a 8 kohm resistor rated 0.50 Watt?

  71. physics

    The vertical surface of a reservoir dam that is in contact with the water is 200 m wide and 14 m high. The air pressure is one atmosphere. Find the magnitude of the total force acting on this surface in a completely filled reservoir. (Hint: The pressure

  72. Science-6th

    I'm having some trouble with this thing in science. It wants us to list four members of the Protist kingdome. I already have 3, algae, protozoa, and slime molds. I can't think of a 4th one! Help please!

  73. social studies

    how geography influenced the expansion of greece?

  74. business

    elaborate the tasks of a manager : planning , co ordinating , controlling , commanding andorganzing .

  75. chemistry

    Can the half cell electrochemistry experiment using a pH meter and aqueous solutions of Cu, Cu2+ and Ag and Ag+ be used to measure even lower concentrations, such as 10^-23 mol of Cu2+ or a single free copper ion in solution? Please explain.

  76. math

    solve -4+7logx=10 & log(x+3)+log(x-2)=log14

  77. chemistry 1100

    If 5.00G of ethanol is added to 15.0G of water, what is the % concentration of ethanol in water ? (% to the correct number of significant figures) and the formula used to get there. THANKUUUU

  78. Chemistry

    what is the primary result of a fisson reaction ? 1 conversion of mass to energy 2 conversion of energy to mass 3 binding together of two heavy nuclei 4 binding together of two heavy nuclei i think its 4, am i right ?

  79. chemistry

    how would you make one gram potassium chloride with barium chloride and potassium carbonate

  80. Math

    The surface area of a rectangular prism is 10.4 in2. What is the surface area of a similar prism that is larger by a scale factor of 3? I am tearing my hair out over this question! Please help asap!

  81. chemistry

    hi, if 5.00g of ethanol is added to 15.0g of water, what is the % concentration of ethanol in water? (% to sig fig)

  82. science

    If the soluton of ammonium chloride is heated to 75 degrees celcius, is the solution now sturated or un saturated?

  83. physics

    what is the diameter of a 1.00m lenght of tungsten

  84. math

    show me fraction that are more than one half using 0-9

  85. trig

    (1/m)= (m-34)/(2m^2)

  86. Chemistry

    which process occurs in a controlled fusion reaction? 1 light nuclei collide to produce heavier nuclei. 2 heavy nuclei collide to produce lighter nuclei. 3 neutron bombardment splits light nuclei 4 neutron bombardment splits heavy nuclei. is it 1 ?

  87. childhood and family development

    Suppose that a preschool class has twelve students, among whom nine languages are spoken. If you were the teacher of this class, what would be your plan to help the children communicate with you and their classmates?

  88. m-100

    find the slope-intercept form of the straight lines,given by the following equations: (a) -4x + 2y =4 (b) 2x = 1-4y

  89. m-100

    write an equation for the srtaight line that satisfies the given conditions. (a) Through (-2,-2); slope -1 (b) Through (4,2); slope 1/2.

  90. physics varsity

    tarzan(85 kg) tries to swing across a river hanging from a monkey rope(10m)long as he reaches bottom of his swing he os travrlling at 8m/s but he doesn't realise the rope has a breaking strength of 1000N.does he make it safely across the river

  91. m-100

    Sketch the graph of each linear function. Give the domain and range. (a) f(x) = -2x + 1 (b)f(x) = -3.

  92. Science

    There's a grauph and obove the grauph it says gravity (mass movement) and then it says pg 67 69 and i dentify 4

  93. Chemistry

    If 10.4 mols of hydrogen, H2, and 9.1 mols of oxygen, O2, are placed together in a container and allowed to react according to the following equation, which one, if any, is in excess and by how much? Also, how many moles of water, H2O, would be produced by

  94. Sociology

    Does the implications of a social movement mean that we are increasingly becoming a nation made of minority groups rather than a nation with a significant majority group that shares the same values, ambitions and dreams?

  95. computer or math

    pls help me to solve this question. thank you very much binary-decimal conversion a.101= b.1100= c.100110= d.111111= decimal binary conversion a.1216 10 b.2121 10

  96. IT/210

    I need help with my assignment called o List the application-level requirements

  97. math (consumer arithmetic)

    a compact disk player is bought on the following terms: deposit: $80.00 Installments: $43 per month for one year Calculate the total price paid.

  98. english

    please correct my grammar. thank you very much to you and your is willing to employ me. I hereby certify that the above information is true and correct to the best of my knowledge. please I need your advise or advice

  99. math

    a guest at a party takes a sanwich from a tray. a second guest then takes a sandwich

  100. Math

    Is 3/4 bigger than 12/56?

  101. biology

    Sugar maple trees are tapped in the spring. how far into the tree would you haev to go to tap the syrup?

  102. Math

    x + 5/8 = - 1/4

  103. algebra

    15-4x=1(3x+1)

  104. chemistry

    Does water or chloride ion bond more strongly to the cobalt(II) ion?

  105. math

    if 7000 is placed in an account with 6 percent intrest compounded annually how many years does it take to triple? rounded to two decimals.

  106. College Algebra

    Change 2x^2-5x=25 to standard form. Then find the solution set.

  107. Algebra

    -8y+1=-9y+2

  108. math

    how to solve sales tax

  109. math

    Someone please help me with this question. What would happen to an equation if you solve from right to left instead of left to right? And please provide an example.

  110. math

    triangle abc is congruent to triangle wxy

  111. Geometry

    Find the area of a rhombus with a perimeter of 20 meters and a diagonal of 8 meters

  112. Algebra II

    x^2 -12y = 12x -12 is a graph of a(n) a) Ellipse b) circle c) parabola d) hyperbola

  113. Art Appreciated

    Discuss how the Late Gothic sense can be seen as an evident in Berlinghieri's St. Francis Altarpiece.

  114. Chem

    balance the half-reaction. (Type your answer using the format CO2 for CO2, [NH4]+ for NH4+, and [Mg]2+ for Mg2+. Use the lowest possible coefficients.) I am sooo confused (a) S(s) --> H2S(g) thanks

  115. Composition 11

    What aspect of writing an introduction do you anticipate will be a challange for you?

  116. Physics

    Halley’s comet orbits the Sun with a period of 76.2 years. a) Find the semi-major axis of the orbit of Halley’s comet in astronomical units (1 AU is equal to the semi-major axis of the Earth’s orbit Physics - drwls, Thursday, May 5, 2011 at 8:51am

  117. stats

    A particular college basketball player is a 80% free throw shooter. In a game, he took 20 free throws. Find the probability he made 18 or more of his free throws.

  118. math

    Condensing 1/2logs+logm+logh-2logI-logd-logk logt+logh+logx-2logl-log0-logl

  119. math

    Simplify: [5(4-x) + (25-9)] + [63(5y + 15) – 4]

  120. Chemistry

    with regard to the reaction of sodium with chlorine (2 Na + Cl2 = 2 NaCl); if 1.0 mole of Cl2 is heated in the presence of 6.0 moles of sodium metal, how many moles of NaCl will be formed?

  121. math

    Scenario: Regression equations are created by modeling data, such as the following: Sales = (Cost Per Item × Number of Items) – Constant Charges In this equation, constant charges may be rent, salaries, or other fixed costs. This includes anything that

  122. how to talk more effectively

    it is important for good speakers to have (a)self confidence (b) enthusiasm (c)good observational skills (d)all of these

  123. Math

    Arrange from smallest to largest 3/7 1/7 5/7

  124. accounting

    What potential problem can arise if a company incorrectly classifies costs? Example, what if an inventoriable cost is classified as a period costs?

  125. Math

    Is it 1/7 3/7 5/7 .

  126. chemistry

    Does water or chloride ion bond more strongly to the cobalt(II) ion?

  127. finance

    Delphi is the US-based automotive parts supplier that was spun off from General Motors in 2000. With annual sales of over $26 billion, the company has expanded its markets far beyond the traditional automobile manufacturers in the pursuit of a more

  128. physics

    find the maximum voltage that can be appliedto a 8 k ohm resistor rated 0.50 watt?

  129. us history

    What is one way italy threatend world peace in the 1930?

  130. ACCT211

    Classiflying Manufacturing Costs The PC works assembles custom computers from components supplied by various manufactures. The company is very small and it assembly shop and retail sales store are housed in a single facility in a Redmond, Washington,

  131. finance

    The owners’ equity accounts for Octagon Transnational are as follows: Common Stock [$2 par value] $20,000 Capital Surplus 360,000 Retained Earnings 1,173,000 Total owners’ equity $1,553,000 a. If Octagon’s stock currently sells for $50 per share and

  132. government

    in what court may redress from the united states be secured?

  133. Math

    The height of a golf ball that is hit into the air with an initial vertical velocity of 112 feet per second is given by the equation h=-16t^2 + 112t, where t is the time in seconds. After how many seconds is the ball at a height of 96 feet above the

  134. physics

    find the maximum voltage that can be applied ti 8 k ohms resistor rated 50 Watt?

  135. Algebra

    Write the equation for this situation.During the month of February, the depth, d, of snow in inches at the base of one ski resort could be approximated by adding 7 to twice the number of days, t, since Janurary 31st.

  136. physics

    what is the magnitude and direction of the electric field 20.0 cm directly above an isolated 33.010 neg6 C charge?

  137. Math / Calculus

    Use implicit differentiation to find an equation of the tangent line to the cardioid at the point (0,0.5) x^2+y^2=(2x^2+2y^2-x)^2 Y=

  138. math

    How to complete the following number sentences so that the answer to each is 1. x/100 + 6/100 +75/100 =1 x/10- 2/10- 4/10 -2/10 = 1

  139. islam

    a.What does “seven earths” as implied in verse 12 surah at-Talaq actually mean? b.Why does the Quran use only a singular noun(al-ardhu) when describing the earth(or seven earths) in this case whereas when describing seven heavens a plural noun

  140. math

    a stoplight flashes red for 50 seconds, yellow for 5 seconds, and green for 65 seconds. For what fraction of a 24-hour day is the stoplight yellow?

  141. novel

    "Big Girls Don't Cry" Rebecca Traister How does Traister define feminism? Would Hillary Clinton count as a feminist according to Traister? Would Sarah Palin? How are the shifting images of the candidates and their spouses evidence of the performative

  142. Algebra

    the length of a rectangle is 5m more than twice its width. and the area of the rectangle is 88m^2. find the dimensions of the rectangle.

  143. creative writing

    Is there a personification example in the song: Did You Ever Know That You're My Hero

  144. physics

    You remove two socks from a hot dryer and find that they repel with forces of 0.003 N when they’re 4 cm apart. If they have equal charges, how much charge does each sock have?

  145. math

    please help me to solve thank you binary addition 101 100 10 1010 1110 -----

  146. physics

    If you were to separate all of the electrons and protons in 1 g (0.001 kg) of matter, you’d have about 96,000 C of positive charge and the same amount of negative charge. If you placed these charges 5 m apart, how strong would the attractive forces

  147. islamic

    One of the important teachings of Islam is to be truthful. It is no doubt relevant when dealing with people/society. However does it apply equally in the realm of our psychology & subsconscious mind? In Psychology,it is a well known fact that one can

  148. Math

    3/5*(1/4+1/2)*20/3=

  149. U.S. History

    Why was separation of the races required?

  150. sociology

    What is (near) infinite wealth?

  151. History

    For my history class I have to do a research report about a social topic and I want to talk about cults. My teacher said to choose one and I chose Heaven's Gate. At first I was going to talk about the harmful effects of cults but after researching it, it

  152. Psychology

    Dr. Lange is a developmental psychologist. He specializes in cognitive development during the period of infancy. Like most psychologists who focus on specific periods of development, his studies: a emphasize the chemical changes in the synaptic gap. b

  153. U.S. History

    Why was separation of the races required on the transit system in Montgomery, Alabama during the 1950s?

  154. chemistry

    determine the pH of 0.15M ammonia assuming the dissociation value of ammonia is Kb=1.8*10^-5

  155. criminal justice

    what is mean median and mode and formulas

  156. College Chemistry

    A rock containing 238U and 206Pb was examined to determine its appropriate age. The molar ratio of 206Pb to 238U was 0.1462. Assuming no lead was originally present and that all lead formed remained in the rock. What is the age of the rock in years? The

  157. Math

    Use the right triangles to find the ratios. Sin 30 degrees

  158. science

    Calculate the amount of potential energy a 3 kg can of paint has when it is placed on top of a ladder that is 2.5 m in height 1.2j ?

  159. College Chemistry

    How much time in years (assume a 365 day yr) would it take for a 1.6678g sample of 239Np to decay to a mass of 0.8671g if it has a half life of 2.030*10^5s

  160. chemistry dilutions

    you have 47 mL of a 2 M stock solution that must be diluted to .5 M how much water should you add

  161. Chemistry

    Does water or chloride ion bond more strongly to the cobalt(II) ion?

  162. MaTH

    Is anyone good at using matlab

  163. economics

    Two companies, A and B, produce widgets. Each can produce 0, 1, 2, 3, or 4 widgets (they can’t produce fractions of widgets). Let X be the number of units produced by A, and Y be the number of units produced by B. Given X and Y, widgets will sell at

  164. Algebra

    x^2+5x-36

  165. Chemistry

    What is the molal concentration m of NaCl,a strong electrolyte in water, if the observed boiling temperature of the solution is 100.361⁰C? (Kb = 0.515⁰C/m for water.)

  166. Government

    What is the Virginia plan and the New Jersey plan?

  167. chemistry

    if 5.00g of ethanol is added to 15.0g of water, what is the % concentration of ethanol is water?

  168. Chemistry

    How much energy in KJ is release to form one mole of 123Sb from protons and neutrons if the atom has a mass of 122.90422 amu? Please remember to include the mass of electrons in calculations. Havent been taught this yet so a step by step walkthrough would

  169. english

    please correct any grammetical errors/tense errors and explain in order to improve my writing. Sara came to Hyderabad airport by flight. Then, she reached Begumpet by auto where she is received by john and escorted her up to the Greenvalley Apartment.

  170. physics

    Find the ratio of the gravitational force on the Moon due to the Earth to the gravitational force on the Moon due to the Sun. (The mass of the Earth is 5.97 1024 kg, the mass of the Moon is 7.36 1022 kg, the mass of the Sun is 1.99 1030 kg, and the average

  171. chemistry

    what are the acids, bases, conjugated nacids and conjugated bases of the equation H2O+H2O->OH-+H3O?

  172. Physics

    a)What speed must one frame of reference be moving relative to another for the two to disagree about the length by 1% b)What speed must one frame of reference be moving relative to another for the two frames to disagree about time intervals by 1%? Both

  173. english

    what are 3 arts of frankenstein in chronological order.

  174. chem

    Ascorbic acid, H2C6H6O6, is a diprotic acide with a K1= 7.9 E-5 and a K2=1.6E-12. In a .005 M aq solution of ascorbic acid which of the following species is present in the lowest concentration. 1. H2O 2. H3O+ 3. H2C6H6O6 4. HC6H6O6- 5. C6H6O6-2

  175. math

    Write 7 3/5 as an improper fraction

  176. marketing

    Hewlett-Packard sells personal computers through specialty computer stores, electronics superstores, and its own Internet site. The marketing mix variable that is being considered here is

  177. 6th grade English

    Need to pick out the subject, verb and adjective 1. I like French Dressing. Subject=I verb=like adj=french 2. Where are my old jeans? subject=jeans verb=are adj=old

  178. Business & Technology

    1. When a hurricand, flood, or pandemic strikes a country, who is most likely to respond. 2. Which economic system is the best solution for handling a crisis of epic proportion?

  179. History

    In what ways will climate change impact global society? Have to write a 4-5 page paper on this I am just needing some ideas. Thanks!

  180. geometry

    what is a factor firework

  181. Lack of transportation

    how much money do u spend on gas getting to college

  182. math

    what are the prime factors of 12?

  183. game theory

    Two companies, A and B, produce widgets. Each can produce 0, 1, 2, 3, or 4 widgets (they can’t produce fractions of widgets). Let X be the number of units produced by A, and Y be the number of units produced by B. Given X and Y, widgets will sell at

  184. Thermodynamics 2nd Law

    The 2nd law of thermodynamics states that “in any spontaneous process, the total entropy of the universe always increases”. Yet in biological systems there are processes where there is a decrease in entropy during a reaction. Give an example of a

  185. Math

    Independent or dependent? In a group of 20 people what is the probability the 2 people have the same birthday?

  186. psyhcology

    in comparision to men with learning disorders, women? A.have higher self-esteem b.have better paying jobs c.out grow their difficulties d.have more relationship problems I chose d but i'm not to sure

  187. history

    What Defense Strategy Was Developed By The Late 1940s Because The US Lacked Sufficient Troops To Confront The Soviet Army In Eastern Europe?

  188. math

    A bag contains 6 red marbles nad 4 blue marbles if Dana draws one marble from the bag and then draws another without replacing the first, what is the probability that both marbles will be red?

  189. pre cal

    Write the equation of the tangent line to the parabola y^2=-1/2x at the point (-1,-2)

  190. Algebra

    Add and simplify: 2/x^2-16 + 3/x^2 -2x-8 Now if the numerator of your answer equals 6, what does x equal? My answer of 5x+16/(x-4)(x+4)(x+2) does not match theirs. The correct answer is -2. I don't know how they got there.

  191. math

    If you have a trapezoid that is divided into two triangles to find the area would you find the area of each triangle then add the two areas together?

  192. algebra 2!

    A swimmer is racing to the other side of the pool. The pool is 75 feet long. The swimmer travels 2.5 feet per second. Create a table, equation, and graph to represent the swimmer's distance to the other side of the pool with relation to time. When will the

  193. math

    Need to write an equivalent fraction for each, using the least common denominator. 1. 7/9, 1/6 ANSWER=12/18,14/18

  194. algebra 2!

    Evaluate the piecewise function f(x)= 7 if x is < or equal to -4; -14 if -4

  195. child care

    The most common underlying feature associated with reading disorders is? A Associated new words with those in memory. B.visually processing the shapes of letters. c.interpreting the meaning of words d.distingushing or seperating sounds in spoken words i

  196. maths stats

    Please unscramlbe aaeebllnn which is a name. Thanks

  197. College Algebra

    Solve using Elimination or Substitution: 4x^2+9y^2=36 x+3y=3

  198. Physics

    Halley’s comet orbits the Sun with a period of 76.2 years. a) Find the semi-major axis of the orbit of Halley’s comet in astronomical units (1 AU is equal to the semi-major axis of the Earth’s orbit

  199. PSY/315

    Is a coefficient of variation a better measure of dispersion than variance?

  200. Phsyics

    I want help with this question. I keep getting it wrong. Please help! Estimate the total amount of translational kinetic energy in a small classroom at normal room temperature. Assume the room measures 5.00 m by 12.0 m by 4.00 m.

  201. abnomal child psychology

    individuals with mild mental retardation can usually acquire academic skills up to approximatley the_______ grade level. a.second b.tenth c.sixth d.twelfth I went with c. sixth please help.

  202. math

    the sum of the ages is 48, Bailey's mom is 15 more than twice his age. what is the ages of the two?

  203. Chemistry Titration Lab

    Calculate the theoretical pH after 2.50 mL and 9.50 mL of NaOH has been added in both the titration of HCl and of HC2H3O2. Given: Molarity of all chemicals are 0.1 M HCl and HC2H3O2 are 8ml prepared in 100ml water. Im guessing I need to make and ICE chart

  204. Statistics

    jenny is 5'10" tall. the heights of the girls in the school are approximately normally distributed with a mean of 5'5" and a standard deviation of 2.6". What is the percentile of jenny's height?

  205. Algebra

    Use the function below to answer the following parts. 1/3x - 4 if -6 3 I found out the domain, range, and points of disontinuity. I think i did them right: Domain= [-6,infinity] Range= [-6,infinity] and points of discontinuity = x=-3,x=3 How do i graph

  206. math

    if a game is started at 7:48am and finishes at 10:58am ... how do I figure how many hours and minutes it took to finish the game?

  207. Child Development

    Temperatues in child care education settings should be set at------ in summer and ------ in winter

  208. math

    a bag contains 6 red marbles and 2 blue marbles. what is the probability of chosing a red marble and a blue marble at the same time?

  209. Physics

    If the change in position Dx is related to velocity v (with units of m/s) in the equation Dx = Av, the constant A has which dimension? a) m/s2 b) m c) s d) m2 I'm not sure how to eliminate the seconds from the velocity. Thanks in advance for any help!

  210. Geometry

    How do you find the slant height of a cone whose height is 8 feet and whose diameter is 16 feet.

  211. math

    A speedboat racer travels at a steady of 0.75 of a mile per 0.25 of a minute. How far does the boat travel in a half minute?

  212. math

    i need to know how to do number sentences 12/15-7/15+/15=1

  213. math

    12/15 - 7/15 + /15 =1

  214. math

    A speedboat racer travels at a steady rate of 0.75 of a mile per 0.25 of a minute. How many minutes does it take for the boat to travel 3 miles? I have 0.75 (is that correct?) How long will it take for the boat to travel 7.5 miles? I have 1.88 (is that

  215. math

    I need to complete the following number sentences so that the answer to each is 1 12/15 -7/15 + /15 =1

  216. Geometry

    What is the area of a circle formed by the intersection of a plane that is 24 mm from the center of a sphere whose radius is 30 mm.

  217. Algebra 2

    A rectangular play area will be enclosed using 100 yards of fencing. What is the maximum area that can be enclosed?

  218. Algebra 2!!

    A shed is designed so that its height is 8 meters less than its width, and its length is 10 meters greater than its width. If the volume is about 1,000 cubic meters, what is the width of the shed (to the nearest meter)?

  219. chemistry

    Assign an oxidation state to each atom in each of the following compounds. 1) Fe(CN)3 i know Fe= +3 but how do i find the oxidation state for C and N? does CN have a normal over all charge?

  220. chemistry

    so we did a chemistry lab to find the relationship between temperature and volume or charle's law. In the experiment, i got t1v1=372K, 267.2 cm^3 t2v2=277K,169.1 cm^3 so i graphed that THen they told us to chose 2 other points from that line, TaVa and TbVb

  221. Earth Science

    Which of the following layers of the atmosphere is closest to the ground?

  222. physics

    If 7.00hp are required to drive a 1500-kg automobile at 66.0 km/h on a level road. What power is necessary to drive the car at 66.0 km/h down a 1.00 % grade? It requires 42.9 hp to drive the car at 66.0 km/h up a 10.0 % grade (a hill rising 10.0 m

  223. calculus

    What's the derivative of f(x)=(x^2-1)(3x^3-6x+5)-4(4x^2+2x+1)

  224. poems

    I NEED EXAMPLES OF HAIKU POEMS

  225. maths

    Trigonometry query. ABC is a rightangled triangle. AD is the bisector of angle BAC. Angle DAC = 15 degrees. X = CD. find X. I know the answer is 7.1 but cannot work out the theory. Could you please help? Thankyou.

  226. Chemistry

    Consider three 1.0 L flasks at 25° C and 96.66 kPa containing the gases CH4 (flask A), CO2 (flask B), and C2H6 (flask C). In which flask is there 0.039 moles of gas? flask A flask C flask B none all

  227. math

    Find the general term: 4/3, 7/7, 10/11, 13/15,...

  228. Chemistry

    Consider three 1.0 L flasks at 25° C and 96.66 kPa containing the gases CH4 (flask A), CO2 (flask B), and C2H6 (flask C). In which flask is there 0.039 moles of gas? flask A flask C flask B none all

  229. math

    if a greater integer is being subtracted from a lesser integer, is the answer positive or negative?

  230. Chemistry

    Balance the following in an acidic solution:1]Fe ----> Fe(OH)2 & 2]NO3 -----> NH4^+

  231. POEMS tanka poem

    examples of tanka poems thanks

  232. CHEMISTRY

    My question is that how can fe=fe(oh2)be balanced in a basic solution....THANKS IN ADVANCE.

  233. Chemistry Help!

    An enzyme has one iron atom per molecule and contains .335% iron by mass. Calculate the molar mass of the enzyme

  234. math

    if a lesser integer is being subtracted from a greater integer, is the answer positive or is it negative?

  235. Chemistry

    A solution of sulfuric acid is 50.0% H2SO4 by mass and has a density of 1.15 g/mL. Calculate the molarity of the solution.

  236. Integral Help

    1.) ∫ (sin x) / (cos^2 x) dx 2.) ∫ (1) / (1+x^2) dx 3.) ∫ xe^x^2 dx 4.) ∫ x^2 sinx dx 5.) ∫ (lnx) / (x) dx

  237. math

    lcd 3/5x^3t, 8/125xt^3

  238. English

    Choose the sentence with the grammatical error below. Answer a. Although hemp and jute have similar qualities, they come from different plants. b. Traditionally made with bits of colored glass and mirrors, kaleidoscopes today may incorporate plastics and

  239. physics

    An elastic cord is 69 cm long when a weight of 57 N hangs from it but is 87 cm long when a weight of 85 N hangs from it. What is the "spring" constant k of this elastic cord?

  240. math

    A speedboat racer travels at a steady rate of 0.75 of a mile per 0.25 of a minute. How many minutes does it take for the boat to travel 3 miles? How long will it take for the boat to travel 7.5 miles?

  241. English

    Choose the sentence with the grammatical error below. Answer A Aristotle studied under Plato then later in his life he tutored Alexander the Great. B Some people consider a four-leaf clover a sign of good luck. C Before the invention of the printing press,

  242. Chemistry

    If 200 g. of an unknown metal oxide, M2O3, upon reaction with chlorine yields 376 g of M2Cl2, then the metal M is: a. Indium b. Aluminum c. Gallium d. Silicon e. boron

  243. projectile physics

    im a bit puzzled, please help me gain the sanity required for this confusion... suppose a ball is thrown from the top of a cliff, and i am supposed to get its final velocity; since when the ball reaches it maximum height, the vf which becomes the vi or

  244. science

    what is the hybridisation of H2o?

  245. Math

    Ms. Hendricks asked her students how they get to school each day. She collected their answers and determined the following results. • Half of her students take the bus. • 1 5 of her students walk. • The rest of her students ride with their parents.

  246. PC Training & Business College

    if 14 accidents can be expected at a certain intersection per week, what is the probability that there will be 3 accident at the intersection on a given day

  247. Math

    Teresa put tiles marked with the letters of her name into a bag. The back of each tile is blank. The tiles are shown below. T E R E S A Without looking into the bag, Teresa will pick a tile. a. What is the probability that Teresa will pick a tile with the

  248. Math

    We are doing multi-step equations in math. And this equation is kind of hard for me because the variable is alone. h-6+7h=42 What does "h" equal?

  249. statistics

    1. A random sample of n = 16 scores is selected from a normal distribution with a mean of µ = 50 and a standard deviation of á = 10. What is the probability that the sample mean will have a value between 45 and 55? What is the probability that the sample

  250. English

    Tanya trusts others beside her best friend. Do I need an "s" after beside?

  251. science

    plunger a has an area of 54cm and plunger b has an area of 15cm, how much more force can be exerted by plunger b

  252. science

    What is the relationship between DNA, chromosomes, alleles and genes?

  253. 10th Grade Science

    -What contains DNA? -Where is DNA found?

  254. physics

    A lead sphere has a diameter that is 0.050% larger than the inner diameter of a steel ring when each has a temperature of 27.9 °C. Thus, the ring will not slip over the sphere. At what common temperature will the ring just slip over the sphere

  255. basic grant writing

    what are the differences between competitive and noncompetitive grants?

  256. math

    how to find the area of a sector when the radius is 8 and you leave it in terms of pi

  257. Social studies

    What are some negative impact of technology?

  258. physics

    During an all-night cram session, a student heats up a 0.420 liter (0.420 x 10- 3 m3) glass (Pyrex) beaker of cold coffee. Initially, the temperature is 19.4 °C, and the beaker is filled to the brim. A short time later when the student returns, the

  259. chemistry

    Here's the problem: You need to make 300L of 2.25M perchloric acid. It costs $25.95 for a 4.00 liter bottle of 60% HClO4, and $34.95 for a 4.00 liter bottle of 70% HClO4. Should you buy the 60% or the 70% bottles? Show your calculations and explain.

  260. science

    when marble undergoes CaCO3+ H2SO4 = CaSO4+H2O+CO2, what happens to it and where can one see the evidence of this effect?