Posts by Greg

Total # Posts: 493

  1. science

    The light from the Sun heats a metal surface. This is an example of A. conduction. B. radiation. C. convection. D. reflection.
  2. Calculus

    A rectangular box with a square base and cover is to have a volume of 2500 cubic feet. If the cost per square foot for the bottom is $2, for the top is $3, and for the sides is $1, what should the dimensions be in order to minimize the cost?
  3. Unit 3: Lesson 8: Interaction of Forces Unit Test

    Can I get all the right awnsor I’m a good student just need to get this test right plzz
  4. Essay

    13 years?
  5. math

    1.-3(n+5)=12 2.46=-6t-8
  6. Science

    Oh Ok thanks
  7. Science

    How would you experiment to find out how much this plant type needs for optimal growth? I am not sure how to answer this question.
  8. greg

  9. Physics

    The density of the dead sea is 1.24x10^3 kg m^-3. A wooden board with an area of 2.5m^2 is dropped in the Dead Sea. Calculate the proportion that would float above the surface. Density of wood= 800kg m^-3
  10. social study

    I believe its a
  11. math

    Hi I wanted to check my work for this problem. Consider the points A(1,0,0) B(2,2,2) and C(0,2,1). 1) Find the vector CA x CB I got -2i -3j +4k for this 2) Find an exact value for the area of the triangle ABC. I got sqrt29/2 for this. 3) Plane II(1) is 2x+3y-4z=2. A second ...
  12. math

    Hi, I was working on my math homework and I was stumbling on these problems. I wanted to double check my answers that I have; I also could not answer 5. If vectors O(0,0,0), A(6,0,0), B(6,-sqrt(24), sqrt(12)), and C(0,-sqrt(24), sqrt(12)) form a square. 1) Find a vector ...
  13. Chemistry

    is the flame coloration a test for the metal or for the acid radical?
  14. vector calculus

    Hi, I'm having trouble answering this question. The lines l1 and l2 are defined as l1: (x-1)/3 = (y-5)/2 = (z-12)/-2 l2: (x-1)/8 = (y-5)/11 = (z-12)/6 The plane j contains both l1 and l2. Find the Cartesian equation of j.
  15. Math 11

    write the equation in vertex form, of a parabola with vertex (5, -1) and that passes through the point (6, 8)
  16. Algebra

    3a + 6 write a situation that could be represented by the Expression
  17. Math

    Katie is baking cookies. She only wants to make 3/4 of the recipe. She needs to take 3/4 of the 2/3 cup of sugar. How much sugar does she need?
  18. Math

    Henry needs to cut a 4 2/3 foot board into 5 equal pieces. How long was each piece?
  19. 6th

    Approximately 2% percent of the people in the world have red hair. There are about 7,000,000, people in the world.About how many people have red hair?
  20. stats

  21. algebra

    A man has two investments. The first pays him 3% interest per year and the other, 4%. The total income from these two investments is $170. If the interest rates were interchanged, the yearly income would be $180. How much is the investment?
  22. Ap physics

    Fg=Fc GMm/r^2 =m4pi^2R/T^2 Therefore M=4pi^2R^3/GT^2 =6.0x10^24kg Note: r = radius of moon orbit, T =27 days approx
  23. Physics

    Your answer is correct, but the net force of an orbiting object is not zero. Objects in circular motion have a net force that points to the center of the circle that generates the centripetal force
  24. Amercian Government

    Becky what were the answers to the lesson 14 unit test for American government ?
  25. Chemistry

    What volume of (2.5M) Hydrochloric Acid will be needed to neutralize 359mL of a 1.50M solution of potassium hydroxide?
  26. Math

    2+3 add each number to itself plus one
  27. Math

    How many 3/8 foot pieces of wood can you cut from a board that is 1 7/8 feet long?
  28. math

    no row or column contains products with only odd numbers , do you agree?
  29. Chemisty

    Combustion of hydrogen sulphide with oxygen in kmol H2S +O2 = H2O + SO2 can somebody balance this for me and break it down to the atomic mass.
  30. Chemisty

    Combustion of hydrogen sulphide with oxygen in kmol H2S +O2 = H2O + SO2 can somebody balance this for me and break it down to the atomic mass.
  31. Math

    An object is projected directly upward from the ground. Its distance in feet from the ground in t seconds is s equals s=112t−16t^2 The object will be 160 feet from the ground after () ​second(s) and after () ​second(s). The object strikes the ground after...
  32. math

    sonya spent 3/8 of her money and had $15 left. how much money did she orginally start with?
  33. math

  34. Math

    john has 28 marbles and sue had 157 marbles, after each added the same amount, sue had 4 times more than john. how many did they each add?
  35. Math

    A seed company claims that 90% of its bean seeds will germinate. If seven of these seeds are planted in warm, moist, soil, what is the probability that exactly 6 of them will germinate? Round answer to nearest ten-thousandth (4 places after decimal)
  36. Math

    The Washingtons buy a $260,000 home by putting 20% down and financing the balance with a 30-year fixed-rate 4.2% mortgage, compounded monthly. What is the amount of their monthly loan payment to amortize the loan?
  37. Math

    If a baseball player has a batting average of 0.420, what is the probability that the player will get at least 2 hits in the next four times at bat?
  38. Math

    Find the probability of the independent event. If P (E) = 0.9, P (F ∣ E) = 0.36, and E and F are independent, find P (F).
  39. 3rd grade math

    HAHA oops wrong way :) 40>35
  40. 3rd grade math

    Area : 8 x 5 = 40 square feet 35>40; yes he has enough
  41. Math

    3 x 2/1 (the reciporical of 1/2) = 6 6 days
  42. Math

    A rectangular swimming pool is bordered by a concrete patio. The width of the patio is the same on every side. The area of the surface of the pool is equal to the area of the patio. What is the width of the patio? (Length of Pool: 24 Width of Pool: 16)
  43. Math

    Find the solution to the system of equations by substitution. 2x+5y=8 and 6x+y=10 Would the answer be (1.5,1)?
  44. Statistics

    A study was conducted to investigate the relationship between the resale price, y (in hundreds of dollars), and the age, x (in years), of midsize luxury American automobiles. The equation of the line of best fit was determined below. y = 179.3 − 20.78x (a) Find the ...
  45. Math

    Solve the sytem of equations using the addition method. 5x+2y=1, x-3y=7
  46. math

    The MAthematical model C=500x+80,000 represents the cost in dollars a company has in manufacturing x items during a month. How many items were produced if costs reached $250,000? I'm so stumped I don't even know where to start.
  47. Vocab

    Big is large
  48. physics

    An electrical device contains a transformer. Its primary coil has 200 turns, and its secondary coil has 20 turns. If the device is plugged into a 120-volt line, what is the output voltage of the device?
  49. Maths Lit , Business Studies , Geography , Tourism

  50. Chemistry

  51. Physical Chemistry

    Im confused with the content
  52. Algebra

    In 2009, a diabetic express company charged $39.95 for a vial of type A insulin and $30.34 for a vial of type B insulin. If a total of $2022.21 was collected for 60 vials of insulin, how many vials of each type were sold?
  53. chemistry

    To what volume should you dilute 47.0 mL of a 5.95 M KI solution so that 27.5 mL of the diluted solution contains 3.50 g of KI?
  54. History

    Which of the following best explains why trade among the colonies flourished? The different regions specialized in different crops. The colonies had developed large fleets of trading ships. Existing trade routes were well-maintained by Native Americans. Colonies were founded ...
  55. History

    Which answer best expresses some of the issues related to economics that are listed in the Declaration of Independence? Cutting off trade and imposing taxes on the colonists are unfair practices. Denying the colonists trial by jury and sending them to Britain to face trial are...
  56. Calculus

    Using a graphing calculator and the concept of differentials determine the values for x when 1/(1+3x)^5 is approx = to (1-15x) within .01
  57. algebra

    you need to know the percentage of growth per year in order to be able to answer this question, because the final number depends on that percentage but for example, let's say it is 5% 2012 - 1993 = 19 years therefore, the formula would be (in millions) 171 * (1.05^19) = ...
  58. stats

    Find the probability of at least 2 girls in 10 births. Assume that male and female births are equally likely and that the births are independent events.
  59. statistics

    In a certain lottery, five different numbers between 1 and 31 inclusive are drawn. These are the winning numbers. To win the lottery, a person must select the correct 5 numbers in the same exact order in which they were drawn. What is the probability of winning?
  60. chemistry

    If four grams of Oxygen and four grams of Helium are placed in a five liter vessel at 338 K, what will be the partial pressure of each gas and the total pressure in the vessel?
  61. Chemistry

    Given that the initial rate constant is 0.0190s^-1 at an initial temperature of 20 degrees Celsius, what would the rate constant be at a temperature of 170 degrees Celsius? Activation energy is 32.4kJ/mol
  62. algebra

    A math class has a total of 47 students. the number of females is 17 less than the numberof males. how many males and how many females are in class?
  63. Math

    Find the adjusted balance due at maturity for a 90 day note of $15000 at 13.7% ordinary interest if a partial payment of $4000 is made on the 60th day of the loan.
  64. Math

    How do I find the exact interest on a loan for $3000 with a simple interest annual interest rate of 15% that was made on June 11 and was due on August 11.
  65. chemistry

    I don't understand...
  66. chemistry

    How do i convert mols cacl2 to agcl
  67. chemistry

    What mass of precipitate is formed when 0.750 L of 2.50 mol/L CaCl2 reacts with 650 mL of 1.75 mol/L AgNO3
  68. Chemistry

    Find the molar concentration of 57.9 g of potassiuum chlorate dissolved in 975 mL of water my work c=nv (57.9/122.55)(975ml) and i got 460 is this correct
  69. Math

    It appears Sir John did not answer the question (nine different answers) so if everyone knew their spouse, the answers were 0, 1, 2, 3, 4, 5, 6, 7, and 8. Since there is no indication of who knew whom, Sir John's wife could be any of 0 through 8. There were 36 handshakes ...
  70. Physics

    An auditorium has dimensions 10m x 10m x 60m. How many moles of air fill this volume at STP? I'm stumped.
  71. math

    The correct answer is: Assuming both pizzas are equal diameter, thickness and weight (which is virtually impossible, but for sake of argument...) IT IS IMPOSSIBLE THAT MARTY ATE MORE PIZZA THAN LUIS. However, if Marty's pizza was LARGER than Luis's pizza by a ...
  72. Math

    do you borrow his bike for a total of 41 minutes.before lunch,he vote for one minute less than five times the number of minutes he rolled after lunch. how many minutes did you fire ride before lunch
  73. Chemistry 111

    Gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 17. g of ethane is mixed with 107. g of oxygen. Calculate the minimum mass of ethane that could be left over by the chemical reaction. Be sure your answer has the ...
  74. geometry

    That's so helpful idiot Reiny
  75. Physics College

    What is the rate of deceleration of a 1400-kg SUV that is going 75.0 km/h and then slows to 25.0 km/h in 8.20 s?
  76. algebra

    the sum of to kim and tony's ages is 42, the difference in their ages is 4 years. what are the ages of kim and tony?
  77. Biology

    Is respiratory control sensitive to small changes in arterial PO2 or in arterial PCO2?
  78. Physics Electricity and Magnetism

    A microscopic droplet of ink in an ink-jet printer is deflected onto the paper by a force of 2.34×10-4 N. If the field causing the deflection is 6.62 kN/C, what is the charge on the droplet? What equation do I use to solve and What does each value mean in the equation? ...
  79. calculus

    a small business owner buys a truck for $20,000 to transport supplies for her business. She anticipates that she will use the truck for 5 years and that the truck will be worth $10,000 in 5 years. She plans to claim a depreciation tax credit using the straight-line ...
  80. Physics

    How long will it take the voltage across the capacitor in an RC circuit to discharge 75% of its initial charged voltage if the resistor has a resistance of 450 kilo-Ohms and the capacitor has a capacitance of 49 micro-farads? How do I solve this problem? Thanks!
  81. Math

    When you use a coupon for 15 percent off the original price of a headset, you pay $27. What is the original price of the headset? Please use an equation.
  82. Chemistry

    Consider the following reaction: CaCO3(s)→CaO(s)+CO2(g). Estimate ΔG∘ for this reaction at each of the following temperatures. (Assume that ΔH∘ and ΔS∘ do not change too much within the given temperature range.) A) 310K B) 1070K C) 1470K ...
  83. math

    A truck has 5.9L engine in it. 5.9L of the overall displacement in 6 cylinders each 102mm bore (diameter) and 120mm stroke (length). Engine operates at 16.3:1 compression ratio and with 6psi (0.41atm) of boost cruising at 1600rpm. What is the volume of ONE cylinder? Then add 6...
  84. Chemistry

    Having trouble with this question on my homework =/ 200mL of 0.5M H2SO4 is combined with 500mL of 0.1M NaHCO3. List the physical states of all products, give molarity of aqueous ions and grams of gases and solids. Thanks alot guys!! Any help is awesome
  85. Chemistry

    Calculate empirical formula C=41.7%,H=6.2%,N=19.3%, and O=33.1% Thanks. any help at all will be awesome!
  86. Math Accounting

    Determine the proposal’s appropriateness and economic viability. For all scenarios, assume spending occurs on the first day of each year and benefits or savings occurs on the last day. Assume the discount rate or weighted average cost of capital is 10%. Ignore taxes and ...
  87. math

    In right triangle, the side opposite to right angle is called what? ANSWER FAST PLZ!!! THX
  88. alg 2

  89. TRIG help quickly please

    Mark any solutions to the equation 2cos2x - 1 = 0. The answer can be more than one. Thank you π/8 -7π/4 15π/4 3π/4
  90. Science check answers please and quickly

    1. Jim is doing a physics experiment on the rate of cooling of solid objects in air. Which of the following is a variable that is not directly part of his experiment, but should be controlled in his experiment? (Points : 1) initial temperature to which he heats the solid ...
  91. Check Answers Quick -Physics

    What causes the centripetal acceleration of an electron in a hydrogen atom? electrical attraction gravity friction <-- tension Question 2. Which of the following terms might a jet pilot use to describe a force that presses him against his seat during a high-speed turn? ...
  92. pyhsis

    It is spelled physic
  93. Reading please please help

    Potatoes are good
  94. A/P Biology

    The Echinopsis mamillosa is a flowering cactus native to Bolivia. A high-rise building is built near a particular Echinopsis, filtering the amount of direct sunlight it receives. Which of the following processes is negatively affected first by the reduction in sunlight? ...
  95. Math 8th grade

    Type the missing number. -25 -23 -22 -21
  96. geometry

  97. math - calc

    A conical water tank with vertex down has a radius of 12 feet at the top and is 26 feet high. If water flows into the tank at a rate of 30 {\rm ft}^3{\rm /min}, how fast is the depth of the water increasing when the water is 12 feet deep?
  98. math - calc

    A conical water tank with vertex down has a radius of 12 feet at the top and is 26 feet high. If water flows into the tank at a rate of 30 {\rm ft}^3{\rm /min}, how fast is the depth of the water increasing when the water is 12 feet deep?
  99. chemistry science

    substrate concentration= 3.5mM (c2) buffer=0.4 ml 10mM PNPP stock= ?ml (V1) water=?ml enzyme= 0.2ml total volume =1ml (V2) I need help with a dilution, I understand that you would be using c1v1=c2v2 but im confused as to what we need to find the amount of water and PNPP stock ...
  100. biochemistry

    substrate concentration= 3.5mM (c2) buffer=0.4 ml 10mM PNPP stock= ?ml (V1) water=?ml enzyme= 0.2ml total volume =1ml (V2) I need help with a dilution, I understand that you would be using c1v1=c2v2 but im confused as to what we need to find the amount of water and PNPP stock ...
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