Popular questions and responses by autumn
  1. Math

    If 8x + 8y = 18 and x^2 – y^2 = –3/8, what is the value of 2x – 2y? The answer is supposed to be -1/3 but I have no idea how to get that. Thanks in advance for helping out!

    asked on June 20, 2018
  2. Math

    The first three terms of an arithmetic progression are 2x, x+4 and 2x+7 respectively. Find the value of x. I have no idea where to go from here – any help would be greatly appreciated, thanks in advance!

    asked on March 19, 2018
  3. Math

    A moving company charges $0.60 per pound for a move from New York to Florida. A family estimates that their belongings weigh about 6 tons. About how much would it cost the family to move from New York to Florida?

    asked on April 13, 2017
  4. You will be missed Ms. Sue :(

    Ms. Sue's last words on this website were on December 7th to another student. She said, "Your Question?" Now, this might not seem like a big deal but...she actually wanted to help. She could have just scrolled past this post but she chose that she anted

    asked on December 11, 2019
  5. Probability

    The probability that an event A occurs is P(A) = 0.3 . The event B is independent of A and P(B) = 0.4 . a) Calculate P(A or B or both occur) . Thanks in advance for the help!

    asked on November 6, 2018
  6. Math

    Solve the equation 2cos2x = √3 for 0°≤x≤360° I did this: cos2x = √3 /2 2x=30 x=15 x=15, 165, 195, 345 Is this correct? Solve the equation √3 sin2x + cos2x = 0 for -π≤x≤π No idea how to approach this one Thanks a bunch for the help!

    asked on October 19, 2017
  7. Math

    How do I go about proving that: cos(4θ) + 4cos(2θ) ≡ 8cos^4(θ) - 3 Thanks in advance!

    asked on September 3, 2018
  8. math

    Mani, James, and isidro equally shared 1/2 of a pie. Which fraction of the whole pie did each of them receive ?

    asked on April 4, 2015
  9. Math

    Sean has $75 to spend on CDs. If each CD costs $6.98, about how many CDs can he buy?

    asked on April 6, 2017
  10. Biology

    Pretty confusing AS Biology question: A scientist carried out an experiment to separate the organelles in an animal cell by mass. The scientist mixed the cells with a buffer solution which had the same water potential as the cells. He then broke the cells

    asked on June 5, 2018
  11. Chemistry

    Ethanoic acid can be reacted with alcohols to form esters, an equilibrium mixture being formed. CH3CO2H + ROH CH3CO2R + H2O The reaction is usually carried out in the presence of an acid catalyst. In an experiment to determine Kc a student placed together

    asked on April 4, 2018
  12. Math - Vectors

    Relative to an origin O, the position vectors of points A and B are given by OA = 3pi + 4j + p^2k, and OB = -pi + -1j + p^2k Find the values of p for which angle AOB is 90° So here's my work so far: If angle = 90° then OA.OB = 0 OA.OB = p^4 - 3p^2 - 4

    asked on December 5, 2017
  13. Math

    Anais bought 4.5 yards of ribbon. She had 3 feet 8 inches of ribbon left after trimming some curtains. How many inches of ribbon did Anais use to trim the curtains?

    asked on April 13, 2017
  14. Chemistry

    Use the information below to answer this question C(s) + O2(g) -> CO2(g) ΔH = -394 kJ/mol H2(g) + 1/2 O2(g) -> H2O(l) ΔH = -286 kJ/mol 4C(s) + 5H2(g) -> C4H10 (g) ΔH = -126 kJ/mol The standard enthalpy of combustion of butane, in kJ/mol, is: A -2880 B

    asked on October 24, 2017
  15. Math

    Each letter in the subtraction problem below represents a different digit from 0 through 9.The digits 3 and 5 don't apear. replace each letter so the subtraction problem is true. GRAPE - PLUM =APPLE

    asked on January 23, 2011
  16. Chemistry

    Which of the following statements is true? A) Chemical reaction rates vary with the conditions of the change, but nuclear decay rates do not. B) Nuclear decay rates vary with the conditions of the change, but chemical reaction rates do not. C) Both

    asked on December 11, 2019
  17. Chemistry

    Sulfur dioxide reacts with oxygen to form sulfur trioxide according to the equation 2SO2(g) + O2(g) 2SO3(g) Samples of sulfur dioxide, oxygen, and sulfur trioxide were added to a flask of volume 1.40 dm^3 and allowed to reach equilibrium at a given

    asked on November 20, 2017
  18. math

    Five people share these four candy bars . what fraction does each share?

    asked on April 4, 2015
  19. english

    what is the helping verb in we will attend the party if we finish our chores in time.

    asked on December 5, 2012
  20. Math

    Solve: ((2^x)-7)^2 = 1 The answer should be x = 2.58 (3 s.f.) or x = 3 but I have no idea how to get there. Thanks in advance!

    asked on April 18, 2019
  21. Math

    If x^4 - y^4 = -15 and x^2 - y^2 = -3, what is the value of x^2 + y^2?

    asked on August 2, 2018
  22. Math & a bit of Physics

    A block of mass 11 kg is at rest on a rough plane inclined at 30° to the horizontal. A force acts on the block in a direction up the plane parallel to a line of greatest slope. When the magnitude of the force is 2X N the block is on the point of sliding

    asked on November 22, 2017
  23. Chemistry

    How would you write an ionic equation for: NH2SO3H + NaOH —> NaNH2SO3 + H2O? Is it simply H+ + OH- —> H2O?

    asked on October 9, 2017
  24. Science

    Which of the following tools can bd used to measure mass? A) a graduated cylinder B) a triple beam balance C) a mercury thermometer D) a bathroom scale I think its B, thank you for the help!

    asked on September 15, 2016
  25. math

    Wayne filled 5 glasses with 2/3 liter of soda in each glass. How much soda did Wayne use?

    asked on May 13, 2015
  26. World History

    How did scientific discoveries change people's attitudes towards natural events and religious faith?

    asked on January 13, 2012
  27. psychology

    need help analyzing !@#$%^& neuro processes effect behavior and impact the field of biological psychology. just need some help understanding this question please....

    asked on August 2, 2010
  28. Math

    How many pounds of potting soil, which costs $0.04 per pound, should be mixed with 20 pounds of nutrient-rich soil, priced at $0.10 per pound, to make a mixture that can be sold for $0.06 per pound? Thanks in advance!

    asked on February 29, 2020
  29. Chemistry

    The following table shows how the initial rate of this reaction depends on the concentrations of the two reactants [NO] [O2] Initial rate 0.0050 0.0050 0.02 0.0050 0.0075 0.03 0.010 0.0075 0.12 Use the data to determine the order of reaction with respect

    asked on March 31, 2019
  30. Chemistry

    Which reaction would occur more readily? Why? 1) Mg + Cl2 --> MgCl2 2) 2Mg + O2 --> MgO Thanks!

    asked on February 5, 2018
  31. Math/Physics

    A car of mass 0.9 tonnes is driven 200 m up a slope inclined at 5° to the horizontal. There is a resistance force of 100 N. (i) Find the work done by the car against gravity. (ii) Find the work done against the resistance force. (iii) If the car slows

    asked on January 8, 2018
  32. Chemistry

    When one mole of ammonia is heated to a given temperature, 50% of the compound dissociates and the following equilibrium is establised. NH3(g) 1/2N2(g) + 3/2H2(g) (note: is my sad attempt at the equilibrium symbol) What is the total number of moles of gas

    asked on November 20, 2017
  33. 8th grade math

    Convert 3.16x10^3 in standard form

    asked on October 26, 2017
  34. Chemistry

    Back again with another problem :) How do you calculate the enthalpy change, in kJ/mol for the reaction of copper(II) sulfate? 0.0210 mol of copper sulfate was added to 25 cm3 of water. The temperature increased by 14°C. The specific heat capacity of

    asked on October 24, 2017
  35. History

    Many people believe that the Civil War is considered to be the worst war in American history. What is the basis for this belief and do you agree or disagree with this statement?

    asked on November 30, 2016
  36. Anatomy

    What does the term "homeostasis" mean? What is one of the mechanisms used by our bodies to maintain homeostasis?

    asked on November 17, 2016
  37. math

    Of 25 students who took a test in math , only 5 received A's .what fraction of the class received an A on the test? Write your answer in simplest form.

    asked on April 4, 2015
  38. math

    A recipe for 1batch of muffins included 2/3 cup of raisins.Ina made 2 and 1/2 batches of many cups of raisins did she use

    asked on April 4, 2015
  39. math

    how do i solve this linear system using substitution or elimination -16x+2y= -2 y=8x-1

    asked on December 5, 2012
  40. Math

    How to round 63 for homework

    asked on March 20, 2012
  41. physics

    My question is what would be the constant in a basketball ofensive rebound experiment? My science q is do the amount of offensive rebounds decide whether or not a basketball will win or loose the game? can you help/

    asked on October 26, 2011
  42. Physics

    A model rocket with mass 1 kg is launched from the ground, starting from rest, and accelerates vertically due to an upward thrust of 25N being produced by the rocket’s engine. The rocket accelerates vertically for a time of 10 seconds at which point the

    asked on April 25, 2020
  43. Chemistry

    Use your knowledge of the law of conservation of mass to answer the following question: In the lab, a student reacts lithium with oxygen to produce lithium oxide. (Lithium + Oxygen -----> Lithium Oxide) How much lithium will be needed to react with 5.4

    asked on December 20, 2019
  44. math

    Together Paul and Jack earned $72 washing cars. Jack washed twice as many cars as Paul. If Paul washed 3 cars, how much did they charge to wash each car?

    asked on December 4, 2019
  45. Math

    Find the value of x 1.92 = (0.015)^x / (0.0075)^x Thanks in advance!

    asked on November 5, 2019
  46. Texas History

    How did the South Texas elite interact with the Anglo settlers? A) Anglo settlers worked for South Texas Elite B) Anglos worked to dominate the South Texas elite C) The elite of South Texas ignored the Anglos D) The elite of South Texas welcomed the Anglos

    asked on November 5, 2019
  47. Georgia history

    The Declaration of Independence stated that the colonists rights came from whom?

    asked on October 16, 2019
  48. Chemistry

    Identify the substance liberated at each electrode during the electrolysis of AgNO3 with inert electrodes. I know that Ag is liberated at the cathode, but how about the anode? Thanks in advance!

    asked on April 21, 2019
  49. Math

    Prove the identity cos3x ≡ 4cos^3x - 3cosx Thank you so much for the help!

    asked on December 6, 2018
  50. Math - Probability

    Reposting again since my previous question may seem like it's been answered. If I shouldn't do this just let me know :) The probability that an event A occurs is P(A) = 0.3 . The event B is independent of A, and P(B) = 0.4 . Calculate P(A or B or both

    asked on November 6, 2018
  51. Chemistry

    What mass of solid potassium sulfate, K2SO4, is used to make up exactly 100.0cm^3 of 0.100 mol/dm^3 SO4^2-? This should be a very easy, 1-mark question but for some reason I can't wrap my head around it. moles = mass/Mr, so all you gotta do is moles x

    asked on October 31, 2018
  52. Chemistry

    A pretty confusing question with weird wording: If the concentration of a compound is 10mg/ml, and its molecular weight is 267.24, how would you make 10 ml, with the compound at 10 µM?

    asked on July 9, 2018
  53. Math

    The chart below shows the population distribution for the 2,400 occupants of the city of Centre Hill. Adult Male Adult Female Child % Living in Uptown 9 8 6 % Living in Midtown 22 20 15 % Living in Downtown 21 22 12 % Living in Suburbs 48 50 67 If there

    asked on June 21, 2018
  54. Math/Physics

    How would you solve this? 1/2 mv^2 - 1/2 m x 25 = mg x 100sin20 I obtained this from the question: A girl on a sledge starts, with a speed of 5 m/s, at the top of a slope of length 100 m which is at an angle of 20 degrees to the horizontal. The sledge

    asked on January 16, 2018
  55. Math

    If x - y = 9, find the maximum value of xy^2 Never seen this type of question before, any help? Thanks!

    asked on November 16, 2017
  56. Math

    How would you differentiate this equation? 1/6(2x-3)^3 -4x Here's my working u = 2x-3 y = 1/6u^3 dy/du = 1/2u^2 du/dx = 2 dy/dx = dy/du x du/dx = (2x-3)^2 -4 Is this correct? Thanks for checking!

    asked on November 9, 2017
  57. Chemistry

    Back with another question similar to the one I asked before, but this one's a bit more confusing 4NH3 (g) + 5O2(g) → 4NO(g) + 6H2O(g) ∆H= –909 kJ/mol 2NO(g) + O2(g) → 2NO2(g) ∆H= –115 kJ/mol 3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g) ∆H = –117

    asked on October 24, 2017
  58. Math

    6sin(2x)+3=0 How do you find the smallest value of x in the interval 0≤x≤π for which y=0? My work so far: 6sin(2x)=-3 sin(2x)=-1/2 The answer should be 7π/12, or 1.83 Thanks in advance!

    asked on October 18, 2017
  59. MATH!!!!

    Is 107 X 10^4 A Scientific Notation

    asked on October 9, 2017
  60. History

    What were the details of the Great Compromise?

    asked on November 25, 2016
  61. Anatomy

    What is Oxytocin? Is this positive or negative feedback?

    asked on November 17, 2016
  62. Algebra

    An ice cream shop has 19 flavors. You also have the choice of a sugar cone, waffle cone or cup. If a person orders two scoops of different flavor ice cream, how many possible orders are there, if you do not care about the order of flavors? I don't

    asked on October 1, 2016
  63. E.L.A

    Three centuries of tension between the plebs and patricians led to the __________.

    asked on June 15, 2016
  64. Geometry

    1. One angle of a rhombus measures 60 degrees. If the perimeter ois 20 inches, find the length of both diagonals. 2. An equilateral triangle has an altitude of 18 inches. Find the are and perimeter of the triangle

    asked on May 19, 2016
  65. Math

    How do you write 200 7/100 as a decimal?!?

    asked on April 13, 2016
  66. math

    Tony deposited $3000 into a savings account that pays him interest at a rate of 3%. How much interest will Tony earn in 5 years?

    asked on February 24, 2016
  67. Pre-Algibra

    Find the radius of a cone with a height of 14 cm and a volume of 718.4 〖cm〗^3, use 3.14 for X and remember to show all work

    asked on February 1, 2016
  68. Chemistry

    When its brakes are applied, a car moving at 10 m/s undergoes an acceleration of -1.2 m/s2. How far does the car travel before it comes to a stop?

    asked on January 15, 2016
  69. Physics

    While playing lawn darts with his friend, Jack notices that when he throws a dart up at 60 degrees it travels 11 meters. How high did the dart travel

    asked on October 7, 2015
  70. math

    kaya brings her sister a stick to hold up a bird feeder. her sister says that she needs a stick that is 5/8 times as long as the stick kaya brought to her. kaya finds a stick that is longer than her first stick.

    asked on June 1, 2015
  71. math

    thomas had 1/3 of a pizza to share with one of hi friends . how much of the pizza did each person get ?

    asked on May 19, 2015
  72. math

    Grandpa has twenty - four coins in his pocket . grandpa gives Sam some clues the total value of the coins in his pocket one - sixth of coins are quarters , one - half of coins in dimes . what is the total value of the coins in grandpa 's pocket that Sam

    asked on May 4, 2015
  73. math

    Kevin uses 1 1/4 cups of milk to make 1 cake . what is the total amount of milk Kevin needs to make 6 of these cakes ?

    asked on May 1, 2015
  74. math

    Jayden had some items to store in a storage unit that was 10 feet long , 8 feet wide , and 10 feet high. What is the volume of the storage unit ?

    asked on April 4, 2015
  75. math

    Brenden read 3/4 of a book that was 7/8 inch thick . how much of the book , in inches , did he read ?

    asked on April 4, 2015
  76. math

    If student A sold 1/5 as many as student B who sold 90 , how many pizzas did student A sell ?

    asked on April 4, 2015
  77. math

    Twenty -five students in a class were selling pizzas door to door in a community of 500.if the town was divided evenly among the students , how many did each student visit?

    asked on April 4, 2015
  78. Algebra

    Simplify. Write the answer using positive exponents only. (x^-5y^-6/a^-5)^-3

    asked on March 27, 2015
  79. math


    asked on February 24, 2015
  80. math

    There was a sidewalk sale at Mega Mall. Everything was marked down by30%. Rodrick bought 3 pairs of jeans originally priced at $29.95 each,a shirt originally priced at $18.50 and a pair of sandals originally priced at $32.29. The sales tax in Roderick's

    asked on December 16, 2014
  81. Math

    The altitude of a plane as it begins to descend is shown by the linear equation a = 22,000 – 800m, where a is the plane’s altitude, in feet, and m is minutes. What is the plane’s altitude when m = 12? ft

    asked on December 13, 2014
  82. Math

    Sorry if this is a lot of questions but What do you hear when you hear the word math? What do you believe when you hear the word math? What do you think when you hear the word math?

    asked on September 2, 2014
  83. algebra

    Sam downloaded four applications for $2.99 each to her cell phone. The remaining applications that Sam purchased cost $1.99 each. If she downloaded x total applications, which of the following equations can be used to find how much Sam spent on cell phone

    asked on March 1, 2014
  84. math


    asked on September 11, 2013
  85. math

    Melissa collected three kinds of autumn leaves when she was out walking today -elm, maple, and oak. She has 2 times as many maple leaves as elm leaves and 5 times as many oak leaves as elm leaves. Altogether, she has 32 leaves. How many of each kind does

    asked on September 11, 2013
  86. math

    Melissa collected three kinds of autumn leaves when she was out walking today -elm, maple, and oak. She has 2 times as many maple leaves as elm leaves and 5 times as many oak leaves as elm leaves. Altogether, she has 32 leaves. How many of each kind does

    asked on September 11, 2013
  87. Math

    The digit in the hundreds place is a square number, and it is odd. The digit in the tens place is 1 more than the square root of 16. The digit in the hundredths place is 0.1 larger than 1/10 of the digit in the hundreds place. The digit in the thousands

    asked on May 2, 2013
  88. English

    14. Why is “The Divine Comedy” an allegory? Everyone dies in the end. The theme is ambiguous. All of the characters and settings are symbolic. The poem teaches a lesson about good and evil. 15. In “The Love Song of J. Alfred Prufrock,” what mood is

    asked on December 18, 2012
  89. Physics

    Talking about significant figures, my Physics textbook lists 5 rules for determining significant figures. 1) All nonzero digits are significant. 2) Zeros to the right of nonzero digits in a number containing a decimal point are significant. 4) Zeros to the

    asked on August 21, 2012
  90. Chemistry

    The pH of vinegar is 2.40. Calculate the concentration of hydronium ions and hyrdroxide ions in vinegar.

    asked on April 11, 2012
  91. Chemistry

    The pH of vinegar is 2.40. Calculate the concentration of hydronium ions and hyrdroxide ions in vinegar.

    asked on April 11, 2012
  92. Algebra

    In 1920, the record for a race was 46.9 seconds. In 1940 it was 46.5 seconds. Let R(t)= the record in the race and t= the number of years since 1920. a) Find a linear function that fits data. b)Predict the records for 2003 and 2006. c) Year when record

    asked on February 28, 2012
  93. Physics

    A hummingbird has a mass of about 1.7 g. Suppose a hummingbird does 0.15 J of work against gravity, so that it ascends straight up with a net acceleration of 1.2 m/s (squared). How far up does it move?

    asked on January 23, 2012
  94. english

    what do you call a story about real things or real people?

    asked on October 30, 2011
  95. Counseling

    Hello, I need help with this question, What factors in today's culture hinder wives from pursuing the C-H-A-I-R-S approach to a relationship as in the book Love and Respect by Eggrich's. I was thinking employment and wives being powerful, thanks

    asked on September 30, 2011
  96. Macroeconomics

    If GDP increases by 5 percent in the same that the deficit is run, What happens to gross debt as a percentage of GDP? What happens to the level of debt held by the public as a percentage of GDP? deficit was $300 billion

    asked on July 10, 2011
  97. Algebra II

    How would I simplify the complex fraction: 3/x^3/1/x^2 ? Thanks

    asked on January 19, 2011
  98. 7th grade

    What are the two vegetation types of Ethiopian Highlands?

    asked on December 15, 2010
  99. physics

    once a 21 kg crate is in motion on a hoizontal floor, a horizontal force of 58 N keeps the crate moving with a constant velocity. the acceleration of gravity is 9.81 m/s^2. what is mu k , the coefficient of kinetic friction, between the crate and the

    asked on November 11, 2010
  100. physics

    The fastest recorded pitch in the MLB was thrown by Nolan Ryan in 1974. If this pitch were thrown horizontally, the ball would falll .809m (2.65 ft) by the time it reached home plate, 18.3 m away (60 ft). The acceleration of gravity is 9.81 m/s^2. How fast

    asked on October 25, 2010


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