# autumn

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!

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!

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?

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

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!

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!

7. ## Math

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

8. ## math

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

9. ## Math

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

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

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

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

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?

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

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

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

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

18. ## math

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

19. ## english

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

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!

21. ## Math

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

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

23. ## Chemistry

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

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!

25. ## math

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

26. ## World History

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

27. ## psychology

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

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!

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

30. ## Chemistry

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

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

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

Convert 3.16x10^3 in standard form

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

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?

36. ## Anatomy

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

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.

38. ## math

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

39. ## math

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

40. ## Math

How to round 63 for homework

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/

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

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

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?

45. ## Math

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

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

47. ## Georgia history

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

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!

49. ## Math

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

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

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

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?

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

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

55. ## Math

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

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!

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

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!

59. ## MATH!!!!

Is 107 X 10^4 A Scientific Notation

60. ## History

What were the details of the Great Compromise?

61. ## Anatomy

What is Oxytocin? Is this positive or negative feedback?

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

63. ## E.L.A

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

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

65. ## Math

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

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?

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

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?

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

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.

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 ?

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

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 ?

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 ?

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 ?

76. ## math

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

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?

78. ## Algebra

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

79. ## math

2y-3(-2y-4y+5)

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

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

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?

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

6d-3d+2d=35

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

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

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

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

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

90. ## Chemistry

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

91. ## Chemistry

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

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

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?

94. ## english

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

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

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

97. ## Algebra II

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

What are the two vegetation types of Ethiopian Highlands?

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