Newest questions posted by molly
  1. math

    Carbon 14 (14C) dating assumes that the carbon dioxide on Earth today has the same radioactive content as it did centuries ago. If this is true, the amount of 14C absorbed by a tree that grew several centuries ago should be the same as the amount of 14C
  2. Math/Statistics/Probability

    Leroy and Fred play chess at a club every Wednesday. The probability that Leroy will lose is .3, that he will stalemate is .5, and that he will win is .2. The probability that Fred will lose is .25, that he will stalemate is .4, and that he will win is
  3. Chemistry

    Which of the following equations is balanced correctly? A. 2 C3H3 + O2 → 2 CO2 + H2O B. Cl2 + 2 KBr → KCl + Br2 C. 3 H2O → H2 + 3 O2 D. 2 C2H2 + 5 O2 → 4 CO2 + 2 H2O Can anyone help me figure out which is balanced correctly?
  4. Chemistry

    If you wanted to dope Selenium with something to make it a p-type semiconductor, what would you use?
  5. US History

    How did the spoils system affect president James Garfield and his successor Chester A. Arthur??
  6. english essay

    essay on taking risks with examples containing Edward Jenner and Mother Teresa (need a thesis, intro, and conclusion, already got body paragraphs)
  7. Science

    Earthquakes and Seismic Waves •If the statement is true right true if the statement is false change the underlined word or words(I’ll put them in parentheses) to make this statement true.• 1.______The shaking and trembling that results for movement
  8. Science

    A student uses a eudiometer tube to collect oxygen gas over water where the temperature is 22 ºC. What is the pressure of the oxygen gas (mm Hg) if the air pressure in the lab is 735 mm Hg?
  9. Statistics

    H(o): u=10 H(o): u>10 (sigma)=2 n=25 In your research, you will fail to reject the null hypothesis if your sample average is less than 10.82 a) What is the probability of making a Type II Error if the true value of "u" is 10.26? b) What is the power of
  10. Chemistry

    I need help filling in the blanks! Still cant get the ideal gas equation down.. (P) (V) (n) (T) 2.00 atm 1.00L 0.500mol ? K
  11. random

    why cant I find a question that I posted earlier? I find it but when I click on it it takes me back to the list of questions asked today, but mine is not there! WHY?
  12. Calculus

    I found part B, but stuck on part A. Use implicit differentiation to find the points where the parabola defined by x^2-2xy+y^2+4x-8y+24= 0 has horizontal and vertical tangent lines. A) The parabola has horizontal tangent lines at the point(s): B)The
  13. Religion (Christian)

    How is the devil described in Revelation 12:10? How does the devil's accusations compare to God's conviction of sin? I'm more stuck on the second question
  14. Chemistry (Easy)

    So say if we're doing an electronic configuration for the element "Lead", We would do [Xe] 6s^2 and 4F^14, but we still need to add in the "d" block. Would it be 5d^9 or 5d^10?
  15. Health and PE

    10. A daily value of 10% means that A. 10% of your calories should come from a particular nutrient B. A food consists of 10 of a particular nutrient C. A food package can bear the nutrient claim "light D. One serving provides 10% of the daily amount for a
  16. history

    what is the compromise in the attack on pearl harbor p.s no wikipedia has the answer
  17. Social Studies

    1. Why did Xerxes want to conquer Greece? a. to increase his country's wealth b. to win glory c. for revenge d. all of these** 2. Xerxes was king of a. Athens b. Persia** c. Delos d. Crete 3. The Greeks won the Battle of Salamis because their ships a.
  18. Trigonometry

    The light on the Prince Shoal lighthouse is 25m above water level. From a position behind the light, the angle of the depression of the sailboat is 12 degrees. How far is the sailboat from the lighthouse, to the nearest metre? (I have no idea how the
  19. Pre Algebra

    A baker can prepare 2 1/2 dozen cupcakes in 1/4 hour. what is the unit rate?
  20. chemistry

    Hello, I was confused on this chemistry problem and I was wondering if someone could please help me. 1) Consider the following chemical reaction: 2CH3OH(I) + 3O2 (g) → 2CO2(g) + 4H2O(I) Calculate the number of moles of CO2 produced when 11.25 mL of
  21. american government

    How does supporting the human rights defenders align with the philosophies of America’s Founding Fathers
  22. Math

    A 100 gallon tank is filled with a salt solution containing 10 lbs of salt. Pure water is pumped in at a rate of 5 gallons per minute and pumped out at the same rate. How many minutes will it take the amount of salt to drop to 8 lbs? Round to one decimal
  23. medical coding

    ICD diagnosis code for traumatic left second fracture of metatarsal
  24. Calc

    Find the Value(s) of C guaranteed by the Mean Value Theorem for Integrals for f(x) =x^3 in the interval [0,3]
  25. Calc

    Describe the x-values at which f is differentiable. f(x)= x^2/5
  26. Calculus

    Why are these false? If a function has derivatives from both the right and left at a point then its differentiable at that point.
  27. Physics

    you pull your 6kg dog on a sled which has a mass of 15kg. while you are pulling at 33N, there is a 12N frictional force that is encountered. what is the acceleration of your sled and dog?
  28. Algebra

    Suppose U={...-3,-2,-1,0,1,2,3...} is the universal set and R={...-3,-1,1,3...}. What is R? A. {-2,0,2} B. {...-4,-2,0,2,4...} C. {...-4,-2,2,4...} D. {-4,-2,2,4} I think it is C. Thank you!
  29. Finite

    Assume that the test has 5 true/false questions, and 10 multiple choice questions (4 options per questions), each with exactly one correct answer. If a student guesses randomly on each question, what is his expected score? .5*5+10*.25 5/15?
  30. math

    Small marbles weigh 3.6 grams each and large marbles weigh 4.6 grams each. A bag contains 40 marbles and weighs 156 grams. How many marbles of each size are in the bag ?
  31. Math

    Two cars are 400 miles apart and start towards one another, one car traveling 4 miles per hour slower than the other. After 3 hours, the cars are 40 miles apart. Find the speed of each car
  32. Chemistry

    I have a question about solubility rules and net ionic equations so for example : CuSO4+Ba(NO3)2----->BaSO4+Cu(NO3)2 Okay so I know BaSO4 is insoluble while Cu(NO3)is solulable, that means BaSO4 will have a precipitate while Cu(NO3) doesn't. So does that
  33. Chemistry

    can you please please help me with these questions I don't know how to do any of them. I know how to calculate moles and grams and mole ratio,etc but I don't understand the limiting excess reactant and yield stuff. Thanks! 1.In the following chemical
  34. Chemistry

    can you please please help me with these questions I don't know how to do any of them. I know how to calculate moles and grams and mole ratio,etc but I don't understand the limiting excess reactant and yield stuff. Thanks! 1.In the following chemical
  35. MATH

    Hi, sorry to bother you. but can you please help me with this problem z=log(e^(5y)) Thanks!
  36. Physics

    A Sunway train starts from rest at a station and accelerates at a rate of 2.0 ms^-2 for 10 s. It runs for constant speed for 50 s and slows down at a rate of 3.5 ms^-2 until it stops at the next station. Find the total distance covered Draw the velocity vs
  37. math

    Alex deposits $250 at the end of each month into an account that earns 4% interest compounded monthly. Determine the value of Alex’s account after 10 years. State you answer to the nearest $1
  38. Calculus

    A spherical balloon is inflated at the rate of 5 cubic feet/minute. What is the volume of the balloon if when the radius is increasing at the rate of 3 feet/minute?
  39. Science

    If 10g of magnesium reacted with 5g of oxygen how much magnesium oxide would you produce? How do you know?
  40. Math

    Tracy has one can of iced tea mix. One scoop of the mix makes two servings of iced tea. The scoop holds 1/12 of a can. How many servings of iced tea can Tracy make?
  41. Chemistry

    how many liters of CO2 and water vapor are produced by burning .3 liters of C2H2 (Acetylene) with .75 liters of O2? The balanced equation is: 2C2H2 + 5O2 = 2 H2O + 4CO2
  42. Math

    The two shortest sides of a right triangle are 10 in and 24 in long. What is the legnth if the shortest side of a similar triangle whose two longest sides are 36 in and 39 in?
  43. Math

    If a punch recipe contains 40% of ginger-ale 25% of Orange Juice 20% of pineapple juice does 15% of sorbet how many cups of sugar are used in 8 cups of punch
  44. 5th grade math

    jimmy measured 3 feet 7 inches tall in May. In October,he measured 4 feet 3 inched tall. How much did Jimmy grow from May to October?
  45. calc

    The quantity (in yards) of a certain fabric that is sold by a manufacturer at a price of p dollars per yard is Q = f(p). 1) What is the meaning of the derivative f ' (16)? 2) What are its units? 3) Is f ' (16) positive or negative? Explain.
  46. calculus

    A flea moves along the line y = -3 according to the equation: x = t^3 - 9t^2 + 24t where x is its x coordinate at time t secs. Determine: 1) the position, velocity, and acceleration of the flea at time 3 secs. Answer: position - 3^3 - 9(3)^2 + 24(3) = 18
  47. English

    The feeling that things weren't as good as they seemed is described best by which image in Borders
  48. Science

    Explain why chlorine (Cl²) is a gas at room temperature, but at sodium chloride (NaCL) is a solid at room temperature.
  49. Math

    c-d / d-c I know the answer is -1, but what is the math that I have to show to get to that answer? Thanks!
  50. Math

    If I had three times as many marbles as my friend and toghter we had 48 marbles how many marbles do I have? 48/3=16?
  51. physics

    Two racing boats set out from the same dock and speed away at the same constant speed of 119 km/h for half an hour (0.500 h), the blue boat headed 26.8° south of west, and the green boat headed 41.4° south of west. During this half-hour (a) how much
  52. Social Studies

    Which of the following is most likely to help countries in West and Central Africa solve their economic problems? A. griots B. microcredit C. imports of natural resources D. negative balance of trade I think the answer is D.
  53. science

    A bus makes a trip according to the position–time graph shown in the illustration. What is the average acceleration (in km/h2) of the bus for the entire 3.5-h period shown in the graph?
  54. Math

    If a graph of a quadratic function can have 0, 1 or 2 x-intercepts. How can you predict the number of x-intercepts without drawing the graph or (completely) solving the related equation? Suppose that the graph of f(x) = ax^2+bx+c has x-intercepts (m,0) and
  55. Chemistry

    Calcium hydroxide has Ksp = 5.5 x 10-5 at 25 oC and a molar mass of 74.10 g/mol. How many grams of calcium hydroxide are needed to create 365 mL of a saturated solution of calcium hydroxide at 25 oC?
  56. Chemistry

    The radioactive nuclide 18F decays by first order kinetics with a half life of 1.83 hr. How many hours will it take for 68.5% of a give quantity of 18F to decay?
  57. Chemistry

    20.0 mL of a 0.18 M HCl solution are combined with 50.0 mL of a 0.085 M NaOH solution. What is the pH of the resulting solution?
  58. math

    Suppose there are 2 pieces of the cake left over,but you don't know how many pieces were in the whole cake. Explain how you could find the number of pieces in the whole cake if Taylor told you 1/6 of the cake was left. You may show your work in a drawing.
  59. Science

    1. Air masses that form over land would be mostly A. Warm B. Cold C. Dry* D. Wet 2. Air masses that form over oceans or seas would be mostly A. Warm* B. Cold C. Dry D. Wet 3. Air masses that form over northern locations would be mostly A. Warm B. Cold* C.
  60. Math

    Chad buys peanuts in 2-pound bags. He repackages them into bags that hold 5/6 pounds of many 2 pound bags should Chad buy so that he he can fill the 5/6 pound bags without any leftovers Common multiple of 5,6 is 30 how 6 goes into 30 5 times
  61. Chemistry

    what is the PH of a solution of .1 M NAN3 that disassociates into HN3
  62. Chemistry

    What volume (mL) of 0.20 M HCl needs to be added to 1.23 L of 0.10 M acetic acid to reduce the percent ionization to 1.00%? Assume the volume of HCl added is negligible compared to the volume of the whole solution, and that the small x approximation is
  63. college physics

    A fisherman poles a boat as he searches for his next catch. He pushes parallel to the length of the light pole, exerting a force of 245 on the bottom of a shallow lake. The pole lies in the vertical plane containing the boat's keel. At one moment, the pole
  64. Chem-mystery

    Determine the PH of a solution that results from mixing 50 ml of .200 M hydroazoic acid, HN3 with 50 ml of CA(OH)2
  65. Chemistry

    What concentration of of CN- is needed to produce the same POH as 3.5*10^-5M solution of BA(OH)2?
  66. Chemistry

    What volume (mL) of .20 M HCL needs to be added to 1.23 L of .10 M acetic acid to reduce percent ionization to 1.00%?
  67. Chemistry

    What concentration of of CN- is needed to produce the same POH as 3.5*10^-5M solution of BA(OH)2?
  68. History

    What does Truman mean when he claims, "Should we fail to aid Greece and Turkey in this fatal hour, the effect will be far reaching to the West, as well as t the East"?
  69. Algebra 1

    suppose you can work a total of no more than 20 hours per week at your two jobs. Babysitting pays $5 per hour, and your cashier job pays $6 per hour. youneed to earn at least $90per week to cover your expenses. Write a system of inequalities that show s
  70. History

    Between 1850 and 1860 several events occurred in the U.S. that highlighted the struggle over slavery. Describe these events and state what finally led to secession of the South beginning in December of 1860.
  71. Help Please

    Is a(bc)=(ab)(ac)
  72. physics

    An 11.8 g bullet leaves the muzzle of a rifle with a speed of 578.5 m/s. What constant force is exerted on the bullet while it is traveling down the 0.6 m length of the barrel of the rifle? Answer in units of N
  73. Help please

    is a(bc)=(ab)(ac)
  74. Elementary manth

    Jose said that the square root -X=3 has no solutino since the square root is a negative, is this true. I think it does has a solution
  75. Math

    Is this the same a(bc)=(ab)(ac)
  76. math

    A plank of wood 6m long is cut in the ratio 1:5. Find the lenght in centimetres of the longer piece
  77. P.E. HEALTH

    True or False: The main process for digestion takes place in the stomach. Is the answer False?
  78. Trigonometry

    Triangle PQR has vertices P(0, 1), Q(0, -4), and R(2, 5). Find the coordinates of R' to the nearest hundredth after rotating triangle PQR counterclockwise about the origin 45º.
  79. Trigonometry

    Triangle PQR has vertices P(0, 1), Q(0, -4), and R(2, 5). Find the coordinates of R' to the nearest hundredth after rotating triangle PQR counterclockwise about the origin 45º.
  80. Math

    Let sin A = 12/13 with 90º≤A≤180º and tan B = -4/3 with 270º≤B≤360º. Find tan (A + B).
  81. Math

    Suppose sinA = 12/13 with 90º≤A≤180º. Suppose also that sinB = -7/25 with -90º≤B≤0º. Find cos(A - B).
  82. American Government

    I need help with the following question I am not sure if the answer is B or C. General Revenue Sharing offers states and localities even greater flexibility than block grants because they? A.are given a blank check. B.are completely unaccountable to the
  83. Trigonometry

    Evaluate the inverse trigonometric function. Give your answer to the nearest degree. (Enter only the number.) cos^-1 (-1)
  84. Trigonometry

    Solve sin θ = 0.95 for -90º ≤ θ ≤ 90º.
  85. Physics

    A renegade watermelon starts at x = 0 m and rolls at a constant velocity to x = −3.0 m at time t = 5.0 seconds. Then, it bumps into a wall and stops. Draw its position versus time graph from t = 0 s to t = 10 s.
  86. Physics

    Two rocks are thrown simultaneously from the top of a very tall tower with identical speeds of v = 7.70 m/s, but in two different directions.One of them is thrown with an angle of 10.0 degrees below the horizontal, the other one at an angle of 50.0 degrees
  87. Physics

    A small, single engine airplane is about to take off. The airplane becomes airborne, when its speed reaches 117.0 km/h. The conditions at the airport are ideal, there is no wind. When the engine is running at its full power, the acceleration of the
  88. Math Homework

    1.) If f(x)=x^2 and g(x)=4x-5, then fg(x)=4x^3-5x^2? True or False? My answer: True 2.) If f(x) =1/x and g(x)=1/x^2, find (g/f)(x). My answer: I need help with this one.
  89. Trigonometry

    A hill in the Tour de France bike race has a grade of 8%. To the nearest degree, what is the angle that this hill makes with the horizontal ground? Round to the nearest tenth of a degree.
  90. Trigonometry

    In the middle of town, State and Elm streets meet at an angle of 40º. A triangular pocket park between the streets stretches 100 yards along State Street and 53.2 yards along Elm Street. What formula for the area of the pocket park would you use?
  91. Trigonometry

    Suppose a triangular silk scarf has both of its shortest sides 14 inches long. If the angle between these sides is 110º, what is the area of the scarf? Round your answer to the nearest tenth of a square inch. (Enter only the number.)
  92. Physics 103

    You're squeezing a springy rubber ball in your hand. If you push inward on it with a force of 1 N, it dents inward 2 mm. How far must you dent it before it pushes outward with a force of 3 N?
  93. Physics 103

    Your new designer chair has an S-shaped tubular metal frame that behaves just like a spring with the spring constant 13000 N/m. When your friend, who weighs 940 N, sits on the chair, how far does it bend?
  94. Algebra1

    Simplify x-4y+2z-3x-3y+2z=❓can someone help me!!!!!!!😣
  95. Physics 1

    A golf ball is struck with a five iron on level ground. It lands 92.0m away 4.20s later. What was (a) the direction and (b) the magnitude of the initial velocity? I have no idea how to go about using the information given to find the first part (A). Even
  96. writing

    How do you write out a PEEL assessment?? (Point, Evidence, Evaluation, Language)
  97. Physical Science

    What volume would 90g occupy?
  98. Physical Science

    How many grams would occupy 12cm^3?
  99. Physics

    Two point charges are located on the y axis as follows: charge q1 = -2.50nC at y1 = -0.700m , and charge q2 = 3.30nC at the origin (y = 0). What is the magnitude of the net force exerted by these two charges on a third charge q3 = 9.00nC located at y3 =
  100. Physics

    Two small plastic spheres are given positive electrical charges. When they are 11.0cm apart, the repulsive force between them has magnitude 0.300N. What is the charge on each sphere if one sphere has four times the charge of the other?


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