Autumn

Most popular questions and responses by Autumn
1. 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!

2. 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?

3. 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

4. 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?

5. 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!

6. 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

7. math

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

8. 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

9. 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

10. 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!

11. 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

12. 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

13. 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

14. math

A certain diet requires no more than 60 units of carbohydrates, at least 45 units of protein, and at least 30 units of fat each day. Each ounce of Supplement A provides 5 units of carbs, 3 units of protein, and 4 units of fat. Each ounce of Supplement B

15. 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

16. Math

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

17. 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

18. 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

19. 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!

Convert 3.16x10^3 in standard form

21. E.L.A

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

22. 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

23. math

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

24. Chemistry

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

25. 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

26. Math

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

27. 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

28. 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?

29. Math

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

30. 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

31. 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

32. 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!

33. 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?

34. 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

35. 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

36. 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

37. Science

What is the difference between p-waves, s-waves, and surface waves? Which do the most damage? Please and thank you!

38. geometry

P, Q, and S are collinear and the measure of PQR = 120°. What does the measure of SQT have to equal to ensure that R, Q, and T are collinear?

39. 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?

40. 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

41. math

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

42. 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

43. 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

44. physics.

During a baseball game, a batter hits a pop-up to a fielder 94 m away. The acceleration of grvity is 9.8 m/s^2. If the ball remains in the air for 5.5 seconds, how high does it rise? Answer in units of m.

45. physics.

Part 1: A ball is thrown horizontally from the top of a building 28.6 m high. The ball strikes the ground at a point 80.3 m from the base of the building. The acceleration of gravity is 9.8 m/s^2. Find the time the ball is in motion. Answer in units of s.

kyle just started a new job that pays \$7 per hour. He had been making \$5 per hour at his old job. Kyle worked a total of 54 hours last month and made \$388 before deductions. How many hours did he work at his new job?

47. statistics

A company manufactures caclculators in batchers of 64 and there is a 5% rate of defects. Find the probability of getting exactly three defects in a batch

48. History

Describe the delegates who attended the Constitutional Convention.

49. History

How did the Federalists and the Antifederalists try to convince people to take their side in the debate over the Constitution?

50. 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?

51. 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!

52. 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!

53. Anatomy

What is Oxytocin? Is this positive or negative feedback?

54. 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!

55. 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?

56. math

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

57. 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.

58. 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

59. 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

60. 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

61. social studies

Who were some of the French explorers who came to North America?

62. 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

63. Anatomy

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

64. 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

65. 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

66. Algebra II

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

67. physics

Part 1: A long jumper leaves theground at an angle of 21.7 degrees to the horizontal and at a speed of 10.6 m/s. The acceleration of gravity is 9.8 m/s^2. How far does he jump? Answer in units of m. Part 2: What is the maximum height he reaches? Answer in

68. world history

Did Islam become more less influential in West Africa from the 700s to the 1400s?

69. psychology

need help analyzing hoe neuro processes effect behavior and impact the field of biological psychology. just need some help understanding this question please....

70. statistics

A company manufactures caclculators in batchers of 64 and there is a 5% rate of defects. Find the probability of getting exactly three defects in a batch

71. algebra

Write each equation in standard form (set equal to zero). Then solve by factoring. Example: x²-2x=8

72. Algebra

One newspaper reported that the mayor received a salary increase of 5%. Another paper reported that the mayor's salary went up \$2000. What was the mayor's salary before the increase? My teacher gave us a hint. y= 1.05x.

73. 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

74. Math

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

75. 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?

76. 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 ?

77. english

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

78. 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

79. 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

What are the two vegetation types of Ethiopian Highlands?

81. physics

Let's pretend the Qs are actual numbers. So an unstretched, mass less spring constant Q3 N/m and length Q10 meters is attached between a wall and a mass of Q5 kg. The coefficient of both static and kinetic friction between the mass and the table is Q13. A

82. Physics

a car travels 59.78 miles east in 89.67 minutes, then 89.67 miles north in 59.78 minutes, and then 29.89 miles at 59.78 degrees west of south in 149.45 minutes. whats the magnitude of the car's average velocity in miles per hour??? Please help!!!!!! P.S.

83. Financial Accounting

Brenda starts a merchanding business on December 1 and enters into three invfentory purchases: December 7 10 units @&6 cost December 14 20 units @12 cost December 21 15 units @ 14 cost Brenda sells 15 units for 25.00 each on Dec 15. Eight of the sold units

84. Science

What is El Nino?

85. 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!

86. 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 ?

87. 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?

88. Algebra

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

89. math

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

90. 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

91. math

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

92. Chemistry

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

93. Chemistry

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

94. 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

95. 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/

96. physics

Part 1: A ball is thrown horizontally from the top of a building 28.6 m high. The ball strikes the ground at a point 80.3 m from the base of the building. The acceleration of gravity is 9.8 m/s^2. Find the time the ball is in motion. Answer in units of s.

97. Physics

Part 1: A car accelerates uniformly in a straight line from rest at the rate of 2.2 m/s2. What is the speed of the car after it has traveled 52 m? Answer in units of m/s. the answer is 15.126 Part 2: How long does it take the car to travel 52 m? Answer in

98. Physics

a car travels 59.78 miles east in 89.67 minutes, then 89.67 miles north in 59.78 minutes, and then 29.89 miles at 59.78 degrees west of south in 149.45 minutes. whats the magnitude of the car's average velocity in miles per hour??? Please help!!!!!! P.S.

99. economics

Why would assigning property rights be a solution to pollution caused by burning coal?