Dan

Newest questions and responses by Dan
  1. math

    A box contains 8 red marbles, 8 green marbles, and 10 black marbles. A sample of 12 marbles is to be picked from the box. How many samples contain exactly 7 red marbles or exactly 6 green marbles? The answer key sets it up as (8 nCr 7)*(18 nCr 5)+(8 nCr

    asked on October 17, 2018
  2. engineering science

    Given the circuit below with unknown voltage source and a voltage drop of 2.233 v Volts on resistor R3, with (R1 = 2KΩ, R2 = 1KΩ, R3 = 3.3KΩ, R4 = 4.7KΩ, R5 = 4.7KΩ). Calculate and complete the table below.

    asked on October 15, 2018
  3. linear algebra

    Let S be the plane defined by 2x+4y+2z = 4, and let T be the plane defined by x+3y+3z = 2. Find the vector equation for the line where S and T intersect.

    asked on September 30, 2018
  4. linear algebra

    Let L1 be the line passing through the points Q1=(3, −3, 4) and Q2=(−3, 6, 7). Find a value of k so the line L2 passing through the point P1 = P1(−6, 11, k) with direction vector →d=[1, −1, −2]T intersects with L1. Not sure how to go on..

    asked on September 26, 2018
  5. Algebra

    Let L1 be the line passing through the points Q1=(−2, −3, −4) and Q2=(−5, −2, −3) and let L2 be the line passing through the point P1=(−27, 31, −25) with direction vector →d=[−6, 9, −6]T. Determine whether L1 and L2 intersect. If so,

    asked on September 26, 2018
  6. Algebra

    The parametric equations for a line L1 are as follows: x = −1−2t y = 4+4t z = 3−2t Let L2 be the line parallel to L1 and passing through the point (2, 5, −3). Find the point P on L2 whose x-coordinate is −3. P = (−3, 0, 0)

    asked on September 25, 2018
  7. physics

    Starting from a trail 1.0m above the water level, you climb straight up a cliff to a point 15m above the water. You then shallow dive into the water and climb back to the trail. Find your displacement (Δx) as well as the distance (d) you covered (not

    asked on September 23, 2018
  8. physics

    The space shuttle had a takeoff acceleration approximately 3.5 times the acceleration due to gravity. What was the speed of the space shuttle 120.s after takeoff if it maintained that acceleration?

    asked on September 23, 2018
  9. Analytical Geometry

    Find the equation of the circle that passes through the point of intersection of the circles x^2+y^2=2x, x^2+y^2=2y and contains the point (2,1)

    asked on June 25, 2018
  10. Social Studies

    7. Which of the following is a way that Native Americans in Washington have become more economically self-sufficient? 1.canoe journeys from Vancouver Island **** 2.relocation of reservations near urban centers 3.fishing and gaming operations, such as

    asked on June 7, 2018
  11. math

    Find the indicated nth partial sum of the arithmetic sequence. 2, 10, 18, 26, . . ., n = 15

    asked on May 14, 2018
  12. math

    Find the partial sum. 100 Σ 2n n = 1

    asked on May 14, 2018
  13. math

    A hardware store makes a profit of $41,000 during its first year. The store owner sets a goal of increasing profits by $9000 each year for 4 years. Assuming that this goal is met, find the total profit during the first 5 years of business.

    asked on May 14, 2018
  14. Science

    "In this lesson, you learned about renewable energy resources and nonrenewable energy resources. Think about the resources discussed in this lesson and select the one that you think is the most effective in all ways. Think about the financial impact, the

    asked on May 3, 2018
  15. Math

    Solve the system of equations algebraically. Show all of your steps. y=x^2+2x y=3x+20

    asked on May 2, 2018
  16. Algebra

    16 1/4 simplify expression assume all variables represent positive numbers

    asked on December 5, 2017
  17. PHYSICS HELP

    (a) If your relaxed eye has a refractive power of 56.0 D, and your lens-to-retina distance is 2.35 cm, determine if you are nearsighted or farsighted. (b) If you are nearsighted, determine your far point. If you are farsighted, determine your near point.

    asked on December 4, 2017
  18. electrical year 2

    how do i answer this. A series RL circuit contains two resistors and two inductors.the resistors are 33 ohms and 47 ohms the inductors have inductive reactances of 60 ohms and 30 ohms. the applied voltage is 120 v. what is the voltage drop on the 33 ohm

    asked on October 23, 2017
  19. History

    Which religion was prominent to much of North Africa in the early 1800s?

    asked on October 12, 2017
  20. Physics

    A golfer hits a shot to an elevated green. The ball leaves the club with an initial speed of 16 m/s at an angle of 58' above the horizontal. If the speed of the ball just before it lands is 12 m/s, what is the elevation of the green above the point where

    asked on October 10, 2017
  21. math

    jeff jogged 5/6km while jon joghed 7/12km whi jogged longer?by how manu kilometer?

    asked on September 27, 2017
  22. math

    jeff jogged 5/6km while jon jogged 7/12km.who jogged longer bu how many kilometers?

    asked on September 27, 2017
  23. math

    jeff jogged 5/6km while jom jogged 7/12km.who jogged longer? by how many kilomteres?

    asked on September 27, 2017
  24. Mathemetics

    the value of a machine depreciates each year by 15%of its value at the beginning of that year. if its value when new on 1st JANUARY 1980 was 10,250, what was its value in January 1989 when it 9years old?

    asked on August 24, 2017
  25. Science

    I have two questions and I have answers for them and I don't know if there right or not. The ones that have stars by the answers is the answers I picked. 1. Complete this sentence. If volume remains the same while the mass of a substance ________, the

    asked on August 22, 2017
  26. Anatomy & Phisiology

    Given: WBC count is 10,000 per cubic millimeter of blood; Blood volume is 5 liters; 60% of WBC are neutrophils; Their average lifespan is 12 hours. Question: How many neutrophils need to be produced every hour on average to keep the count a constant?

    asked on May 1, 2017
  27. physics

    A railroad car with a mass of 1.98 ✕ 104 kg moving at 2.92 m/s joins with two railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at 1.54 m/s. (a) What is the speed of the three

    asked on April 26, 2017
  28. physic

    1. A 57 g tennis ball is moving to the left at 36.2 m/s. It collides with a wall and rebounds to the right. The tennis ball is in contact with the wall for 0.107 s and it loses 14% of its kinetic energy during the impact. What is the average force

    asked on April 21, 2017
  29. Geography (solar declination)

    For a assignment we were told to go outside at 12:30 and stand w/ our backs to the sun and measure our shadow. Then for the second part we were asked what would the difference be if we did the same thing on June 21st? (summer solstice). If it were done on

    asked on April 6, 2017
  30. Geography (w/ geometry)

    I am completely confused when it comes to this problem, I don't even know where to start. I tried just seeing how many times the bridge length goes into the building's shadow but still comes up way short. this is the problem (btw in the real life photo the

    asked on April 5, 2017
  31. Geography (w/ geometry)

    So I'm trying to calculate the latitude of where I am via a few factors. My lesson says I need to know the following: The date of my measurements: 4/3/17 the time: 12:30 my height: 5' 10" my shadows length: 4' 6" It then says first, compute the angle of

    asked on April 4, 2017
  32. Calculus

    Find dy/dt where y = 2 sqrt(2)− 4 and dx/dt = 9 when x = 4. I found the derivative of y=2sqrt(2)-4 but I am stuck as to where to plug in dx/dt

    asked on March 21, 2017
  33. physics

    The spring is compressed against the floor a distance of 1.6 cm and released. If the spring constant is 60 N/m, what is the magnitude of the spring force acting on the toy at the moment it is released?physics

    asked on March 14, 2017
  34. physics

    In an arcade game, a 0.12 kg disk is shot across a frictionless horizontal surface by being compressed against a spring and then released. If the spring has a spring constant of 230 N/m and is compressed from its equilibrium position by 8.0 cm, what is the

    asked on March 13, 2017
  35. Chemistry

    Convert the information described below into balanced equation: (a) When a mixture of copper(II) oxide and carbon is heated, elemental copper forms and carbon monoxide evolves into the atmosphere. (b) When a concentrated solution of sodium hydroxide is

    asked on March 12, 2017
  36. Algebra

    a large pizza costs $6.80 plus $.90 per topping. a different pizza costs $7.30 plus $.65 per topping. How many toppings need to be added to each piece in order for the pizzas to cost the same thing?

    asked on March 10, 2017
  37. Social Studies 6th grade

    What is a modern form of paper.

    asked on March 8, 2017
  38. Social Studies

    How has paper changed over time.

    asked on March 8, 2017
  39. Language/english

    In a paragraph, compare and contrast the two forms of poetry haikus and limericks. It should include a specific description of each form. Explain how they are both alike and how they are different.

    asked on March 2, 2017
  40. language

    1:Which word is a conjunction in the sentence: The man quickly but carefully opened the oysters hard shell. A:quickly B:but C:carefully D:opened

    asked on March 2, 2017
  41. physics

    a uniform plank of lenght 5m and a mass1kg support two masses of 500g and 300g . determine the centre of gravity

    asked on February 15, 2017
  42. Math

    Graphic designer has offered client 3 options. Poster 1 16x20 inches. Poster 2 1/2 the side of option 1. Option 3 poster that is 5/4 the size of Option 1. The photo on Option 1 is 4x5inches what size would that photo be on Option 2 and Option 3?

    asked on February 15, 2017
  43. grammer

    find the error?? The client’s hospital stay was prolonged, do to a superinfection. client’s/stay was/do to

    asked on February 10, 2017
  44. physics

    Tarzan tries to cross a river by swinging from one bank to the other on a vine that is 11.2 m long. His speed at the bottom of the swing is 7.4 m/s. Tarzan does not know that the vine has a breaking strength of 1.0 ✕ 103 N. What is the largest mass that

    asked on February 7, 2017
  45. Math

    The flower produced by the morning glory has a polygon appearance. Classify and name the polygon produced by the flower What does classify mean?

    asked on January 26, 2017
  46. science

    A car slows down from a speed of 20m/s to rest in 25 seconds.Find its acceleration.

    asked on December 8, 2016
  47. physics

    A pendulum clock has a pendulum shaft made of aluminum which has a coefficient of linear expansion of 24.0*10^-6K^-1. At 22 degrees celsius the period of the swing of the pendulum is 1.00seconds. If the temperature is reduced to 5 degrees celcius, how much

    asked on November 26, 2016
  48. Physics

    The temperature of the Sun’s surface (the so-called photosphere) is about 5500 C. Assume that the Sun’s surface is pretty close to a perfect black-body emitter. (a) At what wavelength does the peak intensity of Sun’s radiation lie? (b) Estimate the

    asked on November 21, 2016
  49. Geometry

    I am doing volume and surface areas of 3D figures, and am running into the problem of having to give the exact answers as well as approximate answers. The approximate answers I don't have a problem with but the exact answers are requiring me to get the

    asked on November 14, 2016
  50. Geometry

    Samantha is buying carpet for her family​ room, which is 8 yards by 13 yards. The carpeting is sold in square meters. How many square meters of carpeting will she​ need? ​ (Use 1 yd ≈ 0.9144​m.) I am pretty sure 8 and 13 need to be squared and

    asked on November 11, 2016
  51. Math

    Start with the integer 4. Subtract 8. From your answer subtract -2, and then subtract 17 from the last answer. What is your final answer?

    asked on November 9, 2016
  52. Stats

    In each hand of Blackjack, Megan wins $2 with probability 0.1, or wins $1 with probability 0.3, or loses $1 with probability 0.6. Suppose Megan continues to play 100 hands of Blackjack, and assume the outcomes of all plays are independent. (a) Compute the

    asked on November 4, 2016
  53. algebra

    the dollar price for a barrel of oil sold at a certain oil refinery tends to follow the demand equation below where x is the number of barrels of oils on the hand in ( millions ) a) how much should be charged for a barrel of oil if there are 6 million

    asked on November 3, 2016
  54. Algebra

    New Orleans has highest elevation of 25, lowest -8. Long Beach has highest 360, lowest -7. Which city has an average elevation of -2?

    asked on October 18, 2016
  55. Math

    If recipe takes 1-1/4 cups of sugar to 2 cups of milk but if you only have 1 cup of sugar then how much milk do you use?

    asked on October 15, 2016
  56. Math

    At a local music store CDs cost 11.99including tax is the number of CDs purchased proportional to the cost of the CDs

    asked on October 7, 2016
  57. Physics

    A car will skid to a halt at a uniform rate of -9.4 m/s^2. If you measure skid marks that are 34 m long, with what speed was the car going just before the driver slammed the brakes?

    asked on October 4, 2016
  58. Math

    -7-14 :(-7)=

    asked on October 3, 2016
  59. Math

    If 3/8 of a cup of milk makes 6 muffins , how many muffins does 1 cup of milk make

    asked on September 20, 2016
  60. hcc

    When you add sugar to it, your cup of coffee becomes not only sweet, also fattening. which part is wrong??

    asked on September 11, 2016
  61. hcc

    which part is wrong? When a person finds itself in stressful situation, it helps to breath deeply.

    asked on September 11, 2016
  62. hcc

    The bottle of tablets has an expired expiration date. which part is wrong???

    asked on September 11, 2016
  63. hcc

    The physician started to perform the operation but the patient was not yet completely under anesthesia. which part of sentence is wrong?

    asked on September 11, 2016
  64. hcc

    A tuberin skin test should be read within 24 hours administered. since-from-as

    asked on September 9, 2016
  65. Math

    5= 6y; y

    asked on July 25, 2016
  66. Math

    X= 2; 7x^3 + 4

    asked on July 25, 2016
  67. accounting

    A term investment of 85000, is madr for 10 years at 4.25% interest. Find the value of the investment at maturity if interest is compoundes quarterly?

    asked on June 16, 2016
  68. Frederick

    A wire of length 50cm is cut into two parts and each part is bent to form a square. If the total area of the two square is 100cm², find the perimeter of each square.

    asked on June 15, 2016
  69. Chemistry

    When 28.2706 grams of solute are used to make a 932 mL solution of potassium hydroxide, what is the concentration of the solution?

    asked on May 16, 2016
  70. Chemistry

    How many grams of solute are required to make a 789 mL solution of calcium acetate with a concentration of 0.0049 M?

    asked on May 16, 2016
  71. Maths

    There is a lampost of twenty meters in height casting light on a tree 10 metres. How long is the shadow of the tree?

    asked on May 13, 2016
  72. Physics

    During a free kick at a soccer playoff game a 0.5 kg ball at the peak of the kick 14.7 m above the field had a kinetic energy of 34.0 J. How fast was the ball booted by the player on the field?

    asked on May 3, 2016
  73. Physics

    A bead of mass m = 41.5 kg is released from point A which is located 5 m above the ground and slides on the frictionless track as shown in the figure. Determine the beads speed when it reaches point C which is located 2.0 m above the ground

    asked on May 3, 2016
  74. Physics

    A 3.1 kg pendulum bob hangs from a 2 meter string. It is pulled to the side, position A, so that the bob is 98 cm (h on the sketch) above the lowest position, position C. The bob is released and begins to swing. What is its potential energy after it has

    asked on May 3, 2016
  75. Physics

    A point mass m = 115 g hangs from a string of length l = 1.07 m. Calculate the value of v, the initial speed m should be given at the bottom, so that the string reaches a maximum angle of = 31.4°?

    asked on May 3, 2016
  76. Math

    Which equation represents the relationship in the table below? K . M -----------.------------ 1 . 5 2 . 10 3 . 15 4 . 20 5 . 25 A) m=5k B) k=5m C) m= 5 + k D) k= 5 + m

    asked on April 25, 2016
  77. maths

    solve the equation log(y)/log(2) + log(y)/log(4) = 6

    asked on April 10, 2016
  78. english

    I have to find out the direct object pronoun and then replace the direct object with a direct pronoun. Please check my answers. 1.My friend sells his new car. (car is the direct object, and I replace car with im not sure. 2. My parents watch the news . (

    asked on March 31, 2016
  79. English

    I need an example of a simile for 'relieved'.

    asked on March 28, 2016
  80. Calculus

    Let f(x) be defined by f(x) = x/(x - 4). What is the image of f?

    asked on March 28, 2016
  81. Calculus

    The function f(x) = x^3 + x an inverse. Compute f^-1(0) and f^-1(2). Hint: Do not try to evaluate f^-1 explicitly.

    asked on March 28, 2016
  82. business math

    Camille Keegan sells lamps for $105.55 that cost her $75.00. Camille's percent of markup based on the selling price is:

    asked on March 23, 2016
  83. Chemistry

    Aqueous sodium sulfide reacts with aqueous calcium chloride to make a solid. The % yield is 85%. Calculate the amount of each reactant needed to actually make 3.0g of the solid.

    asked on March 20, 2016
  84. Chemistry

    We did a titration of calcium hydroxide lab in chemistry, once with and once with edta, we have to calculate the solubility for both, and the ksp, for the hcl I did (concentration)*(Volume of hcl used) then that answer divided by two divided by the amount

    asked on March 14, 2016
  85. Physics

    Someone please help. A radio needs to be tuned to a range of values between 526.5 - 1606.5 kHz. Choose a combination of inductor and variable capacitor values within a tuned circuit that would meet this requirement. Choose practical components from

    asked on March 10, 2016
  86. math

    Construct a 2 × 2 matrix that defines a shear of factor 4 in the y-direction, followed by a scaling of factor 5 in the x-direction, followed by a reflection about the y-axis.

    asked on March 7, 2016
  87. Math

    Find a single matrix that defines a rotation of the plane through an angle of π/6 about the origin, while at the same time moves points to five times their original distance from the origin.

    asked on March 7, 2016
  88. Writing

    Where is somewhere I can get a definition from that I can cite as a scholarly source? My prof said that we can't use an online dictionary.I need to find the definition of universal health care if that matters

    asked on March 1, 2016
  89. Chemistry

    I did a lab, an kinetics lab (iodide clock) and in my lab report I have to calculate the initial rate in mol L-1 s-1 and I'm not sure how to do that. I have the [I-] and [S2O82-] in mol L-1 already. The reagents are [KI] [NaCl] [Na2S2O3] [Na2SO4] [K2S2O8].

    asked on February 29, 2016
  90. U.S History

    Are advertisements valuable primary sources/reflections of culture? Why or why not?

    asked on February 27, 2016
  91. Chemistry

    27% of heat produced by the stove's gas burner is transferred to the soup in the covered pot, the rest is lost. Determine the total mass in grams of methane that must be burned to heat 800 ml of water from 22 to 90 degrees C. The density is 1.08 g/ml and

    asked on February 26, 2016
  92. Chemistry

    I have to write the rate law for two elementary reaction equations A ) 2a+b>c+d B ) X+Y>Z I'm pretty sure it's just k[ A ][ B ] and k[ X ][ Y ] but does the coefficient affect it in this case? is it [ A ]^2 ?

    asked on February 24, 2016
  93. Chemistry

    PART 1 >>Trial 1 Reactant Solution A 10 ml I^-, 5.0 ml S2O3^2- Reactant Solution B 10 ml S2O8^2-, 1 ml starch time to react = 10 seconds >>Trial 2 Reactant Solution A 10 ml I^-, 5.0 ml S2O3^2- Reactant Solution B 5 ml S2O8^2-, 1 ml starch time to react =

    asked on February 24, 2016
  94. Chemistry

    PART 1 >>Trial 1 Reactant Solution A 10 ml I^-, 5.0 ml S2O3^2- Reactant Solution B 10 ml S2O8^2-, 1 ml starch time to react = 10 seconds >>Trial 2 Reactant Solution A 10 ml I^-, 5.0 ml S2O3^2- Reactant Solution B 5 ml S2O8^2-, 1 ml starch time to react =

    asked on February 24, 2016
  95. Chemistry

    I have to write the rate law for two elementary reaction equations A ) 2a+b>c+d B ) X+Y>Z I'm pretty sure it's just k[ A ][ B ] and k[ X ][ Y ] but does the coefficient affect it in this case? is it [ A ]^2 ?

    asked on February 24, 2016
  96. Math

    I need to find the limit as x goes to 3 of (1-sqrt(x-2))/(x-3)), I know the answer is -1/2 but I have no idea how to get to the answer, and help would be appreciated

    asked on February 17, 2016
  97. Chemistry

    I have to calculate the heat capacity of a coffee cup calorimeter, but I'm not sure how. I have NaCl and NaOH, they both start at the same temperature, and I have the mass of the solutions used. I'd appreciate the help!

    asked on February 8, 2016
  98. Science

    Hydrogen peroxide can be prepared in several ways. One method is the reaction between hydrogen and oxygen, another method is the reaction between water and oxygen. Calculate the ΔG°rxn of each reaction below? 1) H2(g) + O2(g) H2O2(l) ΔG°rxn=? (in kJ)

    asked on February 5, 2016
  99. Math

    find the limit as x->3 of (1-sqrt(x-2))/(x-3) I'm not sure how to get the answer, I know it's -1/2, but I don'y know how to get that.

    asked on February 5, 2016
  100. math

    The graph of y=x^2 is transformed by a stretch of scale factor 2 parallel to the x axis, followed by a translation of (0 3). WRITE DOWN the equation of the new graph

    asked on February 3, 2016

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