derek

Popular questions and responses by derek
  1. Math

    −9x+2>18 OR 13x+15≤−4

    asked on January 1, 2020
  2. Calculus

    An air ambulance is travelling from Barrie to Toronto. Toronto is located 90 km [S5°E] of Barrie. If the wind is blowing from the South with a velocity of 62 km/h, and the plane’s air speed is 375 km/h, what direction must the pilot fly to make it to

    asked on July 2, 2008
  3. Chemistry

    The aquation of tris(1,10-phenanthroline)iron(II) in acid solution takes place according to the equation: Fe(phen)32++ 3 H3O++ 3 H2O →Fe(H2O)62++ 3 phenH+. If the activation energy, Ea, is 126 kJ/mol and the rate constant at 30°C is 9.8 × 10-3 min-1,

    asked on December 2, 2014
  4. math

    LeAnn wants to gift wrap a present she got for her little brother. How many square inches of gift wrap will be needed to cover a box that is 5in x 7in x 3in?

    asked on March 19, 2019
  5. physics

    A ball is thrown vertically upward with an initial speed of 20 m/s. Two seconds later, a stone is thrown vertically (from the same initial height as the ball) with an initial speed of 24 m/s. At what height above the release point will the ball and stone

    asked on September 16, 2008
  6. Statistics

    A teacher gives a reading skills test to a third-grade class of n = 25 at the beginning of the school year. To evaluate the changes that occur during the year, students are tested again at the end of the year. Their test scores showed an average

    asked on February 2, 2017
  7. math

    the formula C=5/9(F-32) is used to convert Fahrenheit temperature,F, to Celsius temperature,C. What temperature in Fahrenheit is equivalent to a temperature of 100 Celsius. I know that in Fahrenheit its 212 degrees, but i used it by using guess and check.

    asked on May 30, 2008
  8. chemistry

    Balance this equation. If a coefficient of "1" is required, choose "blank" for that box. CH4 + O2 → CO2 + H2O

    asked on May 2, 2016
  9. Linear programming

    Riverside Oil Company in eastern Kentucky produces regular and supreme gasoline. Each barrel of regular sells for $21 and must have an octane rating of at least 90. Each barrel of supreme sells for $25 and must have an octane rating of at least 97. Each of

    asked on June 26, 2011
  10. math

    How do the graphs of y=1/x and y=5/x+6 compare?

    asked on February 7, 2019
  11. physics

    Two parallel plate capacitors are identical, except that one of them is empty and the other contains a material with a dielectric constant of 4.2 in the space between the plates. The empty capacitor is connected between the terminals of an ac generator

    asked on November 13, 2012
  12. Calculus

    For the decomposition of Carbon 14, find the age of a prehistoric cave painting discovered in the Lascaux Caves in southern France if the amount of Carbon 14 has decayed to 14.29%...again using calculus formulas. Not sure how to use this equation (content

    asked on July 15, 2008
  13. English

    Which of the following words is different from the others? A. Sell B. Trade C. Barter D. Bargain

    asked on March 2, 2013
  14. Chemistry

    The cooling system in an automobile holds 10.0 L of ethylene glycol antifreeze. How much energy is absorbed when the temperature of the ethylene glycol goes from 20°C to 100°C? The density and specific heat capacity of ethylene glycol are 1.11 g/mL and

    asked on October 21, 2015
  15. Calculus

    At noon, ship A is 130 km west of ship B. Ship A is sailing east at 25 km/h and ship B is sailing north at 20 km/h. How fast is the distance between the ships changing at 4:00 PM?

    asked on May 10, 2018
  16. probability and statistics

    a set of 10 cards consists of 5 red cards and 5 black cards. the cards are shuffled thoroughly and i choose one at random, observe its color, and replace it in the set. the cards are thouruoghly reshuffled and i again choose a card at random, observe its

    asked on November 24, 2008
  17. math

    what is the expression (6x^3y^6)^2 equivalent to?

    asked on May 30, 2008
  18. Math

    Denise took a total of 80 calls on her shift at work today. Of those 80 calls, 55% were resolved, 15% escalated to a supervisor, and 10% required that a technician be sent out to the customer's house. What is the total number of calls that Denise resolved

    asked on August 20, 2013
  19. physics

    1.If a mass is 15 cm from the axis of rotation and makes 25 revolutions in 10 seconds, what is its speed in m/s? 2.If m = 0.1 kg and the values above still hold, what is the numerical values of the centripetal force?

    asked on October 18, 2010
  20. Summer School Calculus

    Add the following vectors , 7m/s [N30E] and 2m/s [S17E], using trigonometry. Once you draw these out into diagrams, you use the triangle law yes? How do you find the angles to use in the cosine and sine law? A little confused, thanks for the help.

    asked on June 28, 2008
  21. URGENT SUMMER SCHOOL CALCULUS

    A force of magnitude 15 N is the resultant of two forces, one of which has a magnitude of 8 N and acts at an angle of 30° to the resultant. Find the magnitude and direction of the other force...how do I begin to solve this!?

    asked on June 29, 2008
  22. Precalculus

    What is the equation of the line tangent to the function f(x)=-x^2+5 at the point (1,4)? A. y=-x+5 B. y=-x+9 C. y=-2x+6 D y=-2x+9

    asked on June 3, 2020
  23. Geometry

    How many different integer values of n satisfy the inequality 1/13 < 2/n < 1/10? F. 1 G. 2 H. 3 J. 4 K. 5

    asked on April 16, 2012
  24. Precalculus

    The longest side of a triangle are 13 ft., 15 ft., and 11 ft.. Find the measure of the opposite longest side. Round your answer to the nearest degree. A. 46 degrees B. 58 degrees C. 77 degrees D. 103 degrees

    asked on June 7, 2020
  25. Physics

    The value of the electric field at a distance of 86.9 m from a point charge is 74.9 N/C and is directed radially in toward the charge. What is the charge? The Coulomb constant is 8.98755 × 109 N · m2 /C 2 . Answer in units of C.

    asked on February 2, 2017
  26. Pre-cal

    Given that P=(-1,8) and Q=(-2,1), find the component form and magnitude of the vector 3 PQ.

    asked on May 14, 2016
  27. math

    4x^2+4y^2-16x-24y+51=0 is the equation of a circle. where is the center of the circle and what is it's radius? A. center (2,3) radius=1/4 B. center (2,3) radius=1/2 C. center (-2,-3) radius=1/4 D. center (-2,-3) radius=1/2

    asked on January 11, 2015
  28. chemistry

    I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl

    asked on February 5, 2014
  29. Algebra, 0110 HELP!

    Including 5% sales tax, an inn charges $210.00 per night. Find the nightly cost at the inn before tax is added. (a) Write an equation to model the problem. Let x represent the nightly cost before tax. (b) Solve the equation to find nightly cost before tax.

    asked on September 7, 2013
  30. physic

    A charge of -2.73 μC is fixed in place. From a horizontal distance of 0.0465 m, a particle of mass 9.50 x 10-3 kg and charge -9.56 μC is fired with an initial speed of 97.2 m/s directly toward the fixed charge. What is the distance of closest approach?

    asked on October 11, 2012
  31. calculus

    Solve the following differential equation: f"(x)=sinx, x(0)=0, x'(0)=1

    asked on December 6, 2011
  32. psychology

    I have trouble understanding whats the three psychological models of mental illness include etiological explanation and the principle therapeutic modality that evolved from the model. Can anyone help me? Thanks

    asked on May 17, 2011
  33. Calc.

    What function would have a derivative of ƒ′(x) = 12x2 + 4x − 10? Explain how you arrived at your answer...I believe the answer is this: f(x)=4x^3+2x^2-10x...and I got this using the power rule and multiplying. Thanks.

    asked on July 16, 2008
  34. math

    if the measures of the angles of a triangle are represented by 2x, 3x-15, and 7x-15, the triangle is 1)an isosceles triangle 2)a right triangle 3)an acute triangle 4)an equiangular triangle

    asked on May 30, 2008
  35. Calc.

    Determine the value of k so that the line with parametric equations x = 2 + 3t, y = -2 + 5t, z = k is parallel to the plane with equation 4x + 3y – 3z -12 = 0

    asked on July 7, 2008
  36. Calc.

    I am so confused with this last part of the unit! What in the world is going on: Use normal vectors to determine the interaction, if any, for each of the following pairs of planes. Give a geometric interpretation in each case and the number of solutions

    asked on July 9, 2008
  37. Calc.

    verify that lim h>0 (e^x+h -e^h)/h=e^x and explain how this illustrates that ƒ′(x) = ln e • ƒ(x) = ƒ(x)... The notes for this section suck big time, so I really don't know where to begin with this. Thanks!

    asked on July 14, 2008
  38. Math

    Add the following vectors using the Triangle Law. 9 N on a heading of [S2°W] and 11 N on a heading of [N31°W]. I've found the magnitude which is 5.9953 but I'm having trouble finding the direction.

    asked on November 13, 2018
  39. Math

    A swimming pool is filled with water at a constant rate of 9 gallons every 10 minutes. After 30 minutes, the pool is filled with 55 gallons of water. Which equation represents this relationship ? F. y= 9x + 55 G. y= 10x + 28 H. y= 9/10x + 28 J. y= 9/10x +

    asked on March 7, 2017
  40. maths

    Given that y is a prime number evaluate 12y-12

    asked on September 22, 2016
  41. algebra

    Gemma recently rode her bicycle to visit her friend who lives 6 miles away. On her way there, her average speed was 16 miles per hour faster than on her way home. If Gemma spent a total of 1 hour bicycling, find the two rates.

    asked on May 2, 2016
  42. college pre-calculus

    4x^2+4y^2-16x-24y+51=0 is the equation of a circle. where is the center of the circle and what is it's radius? A. center (2,3) radius=1/4 B. center (2,3) radius=1/2 C. center (-2,-3) radius=1/4 D. center (-2,-3) radius=1/2

    asked on January 11, 2015
  43. Physics

    You serve a tennis ball from a height of 2.1 m above the ground. The ball leaves your racket with a speed of 19.2 m/s at an angle of 5.3° above the horizontal. The horizontal distance from the court's baseline to the net is 11.83 m, and the net is 1.07 m

    asked on September 8, 2014
  44. Chemistry

    When magnesium hydrogen carbonate reacts with sulfuric acid, would you consider that an exothermic reaction because it forms CO2 (gas)?

    asked on May 27, 2014
  45. chemistry

    I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl

    asked on February 5, 2014
  46. Math (HELP PLZ)

    The glass in Lee’s window needs replacing. It is 30 inches wide and 24 inches long. What is the area (A) of the glass Lee should buy? A. A = (2 × 30) + (2 × 24) = 108 in. B. A = 30 × 24 = 720 in2 C. A = 2 × (30 + 24) = 108 in2 D. A = 30 + 24 = 54 in.

    asked on June 3, 2013
  47. launguage

    Read the following excerpt from “All Together Now”: What can parents do? We can put our faith in young people as a positive force. I have yet to find a racist baby. Babies come into the world as blank as slates and, with their beautiful innocence, see

    asked on March 12, 2013
  48. Math

    a banner requires 1 1/2 sections of plastic. How many banners can be made from 12 sections of plastics? A.7 B.8 C.9 D.15

    asked on March 2, 2013
  49. Chemistry

    How much heat is required to warm 1.50 kg of sand from 20.0 C to 100.0 C?

    asked on March 20, 2012
  50. psychology

    In psychology, the study of personality focuses on: change. stability. external factors. learned factors

    asked on November 25, 2011
  51. geometry

    a large square has sides of 24 units, midpoints of its sides are connected to create a smaller square. what is the area of the smaller square

    asked on October 30, 2011
  52. algebra

    Draw And Shade a figure that represents 150%.

    asked on August 25, 2010
  53. chemistry

    How many grams of ammonia are formed when 1.34 grams of nitrogen react with an excess of hydrogen(3 H2 + N2 reacts to form 2 NH3)(Answer to tenths ex. 2.5)?

    asked on July 6, 2010
  54. English

    I want to know all the Rhetorical and Figurative Devices and Examples in the Essay Hidden Lesson by David Suzuki

    asked on October 26, 2009
  55. Urgent CALCULUS

    So, I haven't posted in a while...but now I am stummped! Only question I can't get today! A team of students seeks to make a flag representing their commitment to the earth. They will be using a green triangle inscribed in a yellow semi-circle. Find the

    asked on July 25, 2008
  56. Calc.

    Determine vector, parametric and, if possible, symmetric equations for the line through Q(2, -1, 3) and the mid-point of the line segment from L(3, -2, 5) to M(1, 4, -7). Not sure what to do with the mid-point.

    asked on July 4, 2008
  57. math

    express 5ã72 in simplest radical form I did this: ã72=ã36*ã2=6ã2 6*5=30 30ã2 Is this right?

    asked on June 9, 2008
  58. math

    which expression represent the product of 2 consecutive odd integers where n is an odd integer? 1)n(n+1) 2)n(n+2) 3)n(n+3) 4)2n+1

    asked on May 30, 2008
  59. math

    mario paid $44.25 in taxi fare from the hotel to the airport. the cab charged $2.25 for the first mile plus $3.50 for each additional mile. how many miles was it from the hotel to the airport?

    asked on May 30, 2008
  60. Calc.

    An air ambulance is travelling from Barrie to Toronto. Toronto is located 90 km [S5°E] of Barrie. If the wind is blowing from the South with a velocity of 62 km/h, and the plane’s air speed is 375 km/h, what direction must the pilot fly to make it to

    asked on July 6, 2008
  61. english

    How do I know if a syllable is stressed or unstressed?

    asked on October 29, 2007
  62. Summer School Calculus

    Another one for you :P, add these two vectors using trigonometry (again)... 9N[S2W] and 11N[N31W]...Again, I am confused about the angles, I am not sure what value I should use for the cosine and sine law. THANKS AGAIN!!

    asked on June 29, 2008
  63. Calculus

    I am asked this: How can you do the cross product of two-dimensional vectors. Well I would have to guess that you just add a 0 in order to follow the cross product method, but this way there is no third component...is this right?

    asked on June 30, 2008
  64. Science

    0.2+8kg

    asked on July 3, 2019
  65. Math

    In Science, one acetic acid molecule is made of 2 carbon atoms, 2 oxygen atoms, and 4 hydrogen atoms. The ratio of carbon atoms to all atoms in 2 molecules of acetic acid is _____ to _____

    asked on February 3, 2019
  66. biology

    [K+] outside = 10 mEq/L and [K+] inside = 150 mEq/L. What effect would reducing the extracellular fluid potassium (K+) concentration from 5mM to 1mM have on RMP and why.

    asked on December 21, 2018
  67. chemistry

    A 6.0-L flask contains 0.60 g at a temperature of 25°C. What is the pressure (in atm) inside the flask?

    asked on April 3, 2017
  68. MATH (POST 2) Need Help Please

    Using the average daily balance method and the information​ given, find the credit card finance charge for the month of August​ (31 days). The annual interest rate is​ 18%. July 31st (Balance) $590 August 5 (Charge) $90 August 9 (Payment)$560 August

    asked on February 18, 2017
  69. Math (Business)

    Using the average daily balance method and the information​ given, find the credit card finance charge for the month of August​ (31 days). The annual interest rate is​ 18%. July 31st (Balance) $590 August 5 (Charge) $90 August 9 (Payment)$560 August

    asked on February 18, 2017
  70. Politics

    To what extent do wealthy countries, such as the US and the members of the European Union have a responsibility to do more for the refugee crisis? I have to write a short essay on this topic and I do not exactly know how to approach it. Thanks

    asked on February 17, 2017
  71. math

    Lily and Rose are playing the game in the game each player starts with 0 points

    asked on October 20, 2016
  72. Math

    I need help with this burrowing money questions. # 1: Zara received a credit card statement that has a new balance of $987.65 & a minimum payment of $43.21. The annual percent rate is 15% compounded daily and charged on the unpaid balance. Zara makes only

    asked on March 18, 2016
  73. chemistry

    Calculate the molarity of a 6% solution of ammoniun nitrate of density 1.025 g/mL

    asked on December 7, 2015
  74. math

    simplify: 6-y/6/1/6-1/y 6-y/6*6y/y-6= 6y/6=y Is this correct help i need help!! answers: A. -y B. y C. -6/y D. -1/y which one?

    asked on January 11, 2015
  75. math

    simplify: (y+1)(y/1-y^2) which answer: A. Y/y-1 B. y/1-y C. y+1/y-1 D. -1 this is what i got y+1/1* Y/1-y^2=-1

    asked on January 11, 2015
  76. math

    if 3abs(x+4)=8, then x=? A. {-10,2} B. {-2,2} C. {-19,11} D. {-22,-14} which one? idek

    asked on January 11, 2015
  77. math

    if 1-1/x=2-2/x, then 3-3/x=? A. -3 B. -1/3 C. 0 D. 1/3 E. 3 idek how to do it?

    asked on January 11, 2015
  78. college pre-calculus

    if 1-1/x=2-2/x, then 3-3/x=? A. -3 B. -1/3 C. 0 D. 1/3 E. 3 idek how to do it?

    asked on January 11, 2015
  79. ap college pre-calculus

    if 3abs(x+4)=8, then x=? A. {-10,2} B. {-2,2} C. {-19,11} D. {-22,-14} which one? idek

    asked on January 11, 2015
  80. college pre-calculus

    simplify: (y+1)(y/1-y^2) which answer: A. Y/y-1 B. y/1-y C. y+1/y-1 D. -1 this is what i got y+1/1* Y/1-y^2=-1

    asked on January 11, 2015
  81. college pre-calculus

    simplify: 6-y/6/1/6-1/y 6-y/6*6y/y-6= 6y/6=y Is this correct help i need help!! answers: A. -y B. y C. -6/y D. -1/y which one?

    asked on January 11, 2015
  82. college pre-calculus

    simplify: square root (4/3)-square root (3/4) A. 2-sqaure root(3)/2 square root (3) B. square root (7/12) C. square root (3)/6 D. 2/square root (3) which answer? this is what i got square root (16/12)- square root (9/12)= square root (7/12)

    asked on January 11, 2015
  83. college pre-calculus help

    simplify: 6-y/6/1/6-1/y 6-y/6*6y/y-6= 6y/6=y Is this correct help i need help!!

    asked on January 11, 2015
  84. math

    (4.3 x 10-8) (1.5 x 109) Compute and write in scientific notation

    asked on March 17, 2014
  85. Math

    If a metal bar at a temperature of 20 degree celcius is dropped in boiling water how long will it take for the bar to reach 98 celcius at a rate of 2 degrees per second

    asked on February 21, 2014
  86. math

    $8000 is shared between 3 schools in the ratio of 2:3:5, how much will each school get?

    asked on February 9, 2014
  87. chemistry

    I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl

    asked on February 5, 2014
  88. chemistry

    I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl

    asked on February 5, 2014
  89. chemistry

    I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl

    asked on February 5, 2014
  90. physics

    After sliding down a snow-covered hill on an inner tube, Ashley is coasting across a level snowfield at a constant velocity of +2.8 m/s. Miranda runs after her at a velocity of +4.8 m/s and hops on the inner tube. How fast do the two of them slide across

    asked on June 30, 2013
  91. comp

    Which of the following contains a pronoun error? (Points : 2) Neither Jane Austen nor Mary Shelley is known for their poetry. As the curtain rises, everyone in the audience settles into his or her seat and waits for the play to begin. The book sale that is

    asked on May 28, 2013
  92. Math

    A fence is 20 ft long. it has posts at each end and at every four feet along its length. how many fence posts are there? Draw a picture.

    asked on May 20, 2013
  93. math

    what is the y-intercept of the line of 35.00 + 8.00x if the slope is 8

    asked on April 26, 2013
  94. Computer (Visual Basic)

    You are in the process of selecting the BackColors and ForeColors for you new application. When you originally learned to use Visual Studio, you were only aware of one of the palettes that was available to you, but your developer colleague informs you that

    asked on April 9, 2013
  95. Advanced Algebra

    Write the equation for the depreciation of the value of your car for t years at 14% per year.

    asked on March 28, 2013
  96. Programming (Visual Basic)

    Im seem to be having trouble with this Exercise. Would you mind helping me please? How do i do this Visual Basic program? Instructions say: Fix the following code: Dim dblRegularPay As Double Dim dblOvertimePay As Double intRegularPay = 783.87

    asked on March 5, 2013
  97. algebra

    Is v=s2 a quadratic relation?

    asked on March 3, 2013
  98. Physics

    Roughly how high could a 340 K copper ball lift itself if it could transform all of its thermal energy into work? Assume specific heat for copper equal to 386 J/kg·K.

    asked on March 3, 2013
  99. Physics

    Roughly how high could a 340 K copper ball lift itself if it could transform all of its thermal energy into work? Assume specific heat for copper equal to 386 J/kg·K.

    asked on March 3, 2013
  100. Math

    2/3/3= A. 2/9 B. 1/9 C. 1 D. 2

    asked on March 2, 2013

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