# Questions Asked onDecember 9, 2007

1. ## Math (Calc)

Find the Exact value of Pi/24. I'm not sure whether to use a half-angle formula or a difference/sum of angles formula.

2. ## MATH

5X4/2-4EXPONET OF 2

3. ## physics question

How much heat had to be put in during the process to increase the internal energy of the gas by 1.50×10^4 J ? Here is the given information and questions that I have already answered: n=.450 R=8.3145 (Point A) p=2*10^5 v=.010 (Point B) p=5*10^5 v=.070

4. ## math

need help Tweleve is sixteen less than four times a number.

5. ## Math

Why Does The President Put Vegetables in His Blender? P.S.: It's puzzle 163 HELP!!!!!!!!!

6. ## Calculus

What is the derivative of t^3/3

7. ## chemistry

Aluminum sulfate reacts with sulfuric acid to produce aluminum sulfate and hydrogen gas. How many grams of aluminum sulfate would be formed if 250g H2 SO4 completely react with aluminum?

8. ## Math

I need help with an IB Math Internal Assessment on Matrix Powers.

9. ## Algebra 1

Name the constant of variation for each question. Then determine the slope of the line that passes through each pair of point. y=2x

10. ## PHYSICS QUESTION!!!!

how do you find the height or time? is it h=squreroot4.9/t or h=squareroott/4.9 or is it something else complettly???

11. ## physics

At the end of the semester, you are loading your gear into a van to go home. In loading the van, you can either lift a 45.0-kg crate straight up(method 1) or push it up a 3.00-m-long ramp that is inclined at an angle above the horizontal (method 2).In both

12. ## math help

Five added to three times a number is 29. can someone help me rewrite these in algrebric form thank you Three more than a number times two and the result is twelve. The sum of plus 7 minus 13 is 27. The product of ten and a number plus eight equals

13. ## Statistics

This is a goodness-of-fit question that I've been trying to wrap my head around for sometime, but I don't understand it since there are two values instead of one. So far, the teacher has only taught us how to deal with one set of observed values. UCLA

14. ## Physics

Oxygen (O2) has a molar mass of 32.0 g/mol [.032kg/mol]. What is the root-mean-square speed of an oxygen molecule at a temperature of 310 K? Vrms=492 m/s What is its average translational kinetic energy at that speed? Kav= ?? J I am having problems with

15. ## Calculus

Write a formuls for the general term(nth term) of the arithmetic sequence. Do not use a recursion formula. Then use the formula for A to the n to find the indicated term of the sequence find a11: 12, 10, 8,...

16. ## Physics

A block of mass M1 = 160.0 kg sits on an inclined plane and is connected to a bucket with a massless string over a massless and frictionless pulley. The coefficient of static friction between the block and the plane is ms = 0.52, and the angle between the

17. ## math

how do i find the common ratio of the infinite geometric ratio series with the given sum and first term? for example: sum=4 first term=7

18. ## chemistry

An orgnaic compound contains C, H, No, and O. Combustion of 0.1023 g of the compound in excess oxygen yielded 0.2766 g of CO2 and 0.991g of H2O. A asample of 0.4831 g of the compound was analyzed for nitrogen by the Dumas method. At STP, 27.6 mL of dry

19. ## physics

A bicyclist rides 5.0km due east, while the resistive force from the air has a magnitude of 3.0N and points due west. The rider then turns around and rides 5.0km due west, back to her starting point. The resistive force from the air on the return trip has

20. ## physics

The hour hand and the minute hand for the famous Parliament clock tower Big Ben in London are 2.7m and 4.5m long and have masses of 60kg and 100kg, respectively. Calculate the total torque due to weight of these hands about axis of rotation when the time

21. ## french

Is this correct meaning I speak a little french. Je parle francais comme ci comme ca?

22. ## Physics

Could someone help explain this problem to me . . . Carbon 14 has a half-life of 5700 year, scientist use this fact to determine the age of things made of organic material. Suppose the average page of a book containing aprox. 0.5mg of Carbon 14 is put into

23. ## Help help help!!!!!!!!!

Simplify 18. -(-4)+3= Solve equations of the form x+a=b solve 26. 6.3=t+2.9 30. -8=14+(d+-6) 32. 312.9+163.4+b 34. - 11/5+w=-4/5 Thank You very much!!!

24. ## Communication/English

Scenario 2:Write an positive message to the supervisor of someone who went above and beyond the call of duty to help you. Scenario 3:Write a negative message to the phone company about charges that should not have been on your last bill. Scenario 4:Write a

25. ## NHD project

I am doing a National History Day project this year on the topic of "From Conflict to Compromise" and my thesis statement has to be turned in tomorrow. Could someone check it and make sure it is arguable and true? The inequality of women caused them to

26. ## algebra

Write the equation of the line passing through (2,-3) and (2,4). Write the answer in slope-intercept form.

27. ## health

yeah its me again :) and thank you Writeacher for checking my answer on smoking An antihistamine used to treat a common cold is intended to: A. Decongest B. Suppress the cough reflex C. Dry secretions D. Increase mucus clearance I think it could be either

28. ## science

A 52.0 kg male dancer leaps 0.37 m high. (a) With what momentum does he reach the ground? (c) As the dancer lands, his knees bend, lengthening the stopping time to 0.050 s. Find the average force exerted on the dancer's body. (d) Compare the stopping force

29. ## rec and leisure

where would i find information on .. small investments in recreation, parks, sports and arts/culture often yield large economic returns money generated by events, capital development and provision of ongoing services is spend several times in the

30. ## Physics

A youngster shoots a bottle cap up a 15.0° inclined board at 1.92 m/s. The cap slides in a straight line, slowing to 0.95 m/s after traveling some distance. If the coefficient of kinetic friction is 0.35, find that distance. I still get 0.315 m as the

31. ## Information Technology

I'm suppose to do Computer System Scenarios. There are 4 of them to do each asking to come up with IT solutions and I have no idea where to begin can someone point me in the right direction? Thanks

32. ## English

In doing my review for mockingbird one of the study questions talks about how does scouts attitude change towards superstion through-out the story.

33. ## Environmental Science

Develop three guidelines based on the four scientific principles of sustainability for our use of genetic engineering and synthetic biology to modify species and ecosystems. I know the four scientific principles are: 1) Reliance on solar energy 2)

34. ## Roberts

Last fall, a gardener planted 65 iris bulbs. She found that only 56 of the bulbs bloomed in the spring. a) Find the empirical probability that an iris bulb of this type will bloom b) How many of the bulbs should she plant next fall if she would like at

35. ## math

trying to reduce to simpilest form 1.t-a/t^2-a^2 i have 1/2(t+a) 2.3y^3+7y^2+4y/y^2+5y+4 i have cannot reduce thanks

36. ## Calc

How do you take the derivative of 9000/(1+.3t+.1t^2)?

37. ## sci 275 enviromental science

what are the hazard identification risk of malathion

38. ## math

can someone tell me what this is Find the pattern 1, 1/4,1/9, 1/16

39. ## Biology

I added amylase to a cornstarch suspension. I thought that amylase breaks down starch into oligosaccharides. But then I heated up the amylase + cornstarch solution and added Benedict's reagent to it (which tests for the presence of monosaccharides). The

40. ## math

I don't know what this is? Find the common difference? 1/2, 1/3, 1/6, 0

41. ## Science

Develop three guidelines based on the four scientific principles of sustainability for our use of genetic engineering and synthetic biology to modify species and ecosystems. I know the four scientific principles are: 1) Reliance on solar energy 2)

42. ## Calc

Find the equation of a tangent line of a graph pf y=x^2+4lnx, which is parallel to y=6x-3? I know parallel lines have the same slope so the slope is 6 but I do not know how to find the b value.

43. ## math

Can somebody help me? Find the common difference? 1/2, 1/3, 1/6, o

44. ## sci 275

what are the risk of malathion

45. ## Government (Judges)

Why would the founding fathers not have requirements for judges, why are they appointed and not elected?

47. ## English

I looked at spark notes and still did not find the answer. In going over the study guide for to kill a mockingbird I cant find an answer for scout being superstitious.

48. ## math

a couple more 1) 3+x(4+x)/3+x i got 4+x

49. ## SraJMcGinn

Hi Just wanted to thank you again for all of your help with Spanish my grade was an A ... Now I am working on to kill a mockingbird -

50. ## math

sorry next one is 3a^2-13-10/5+4a-a^2 i got cannot reduce

51. ## Algebra

what is the y-intercept of the line with a slope of -3 and a y-intercept of -5? How so i do this problem?

52. ## Calc

Ralph is taking his final exam. After t minutes into the exam Ralph has correctly solved P(t)=-.001t^3+.078t^2+.16t problems. a) at what time was Ralph solving problems most efficiently? b) at what time did Ralph's efficiency decline?

53. ## Physical Science

does light travel faster through glass or a vacumm?

54. ## Math

The sum of 2 consecutive integers is equal to their difference.

55. ## NH4Cl

NH4Cl Is it N surrounded by 4 H's and then the Cl is connected to a H?? Technically I think that couldn't happen so how would this molecule look? Thanks

56. ## Physics

As the frequency of sound waves increases, the wavelength of the sound waves decreases true or false?

57. ## physics

As the period of a wave increases, the frequency increases true or false?

58. ## algebra

Charles opened the old trunk and found \$6750 in \$1 bills and \$10 bills. If there were 150 more ones than tens, how many of each kind were there?

59. ## Calc

Classify all critical points of the function f(x,y)=x^2-y^2+4x-2y+1. I know I have to take the partial derivative and set them equal to zero to get my points and then use the Hessian. For some reason I am not getting the correct answer. partial d/dx 2x+4

60. ## human risk assessment

What are the advantages and disadvantages of animal studies and epidemiological studies for establishing dose-response relationships?

61. ## AP World History

Please give me resources (hopefully, straightforward ones) on the contact between groups of people occured and the nature of that contact, including the notation aboiut the impact of that contact on both parties: -Developlment and Spread of Islamic

62. ## Science Fair

I know that clay adsorbs heavy metals such as lead. How can I pull the lead back off of the clay so that it will percipitate with KI?

63. ## methods for teaching

please help me find some sites for the ff: 1. situational language teaching 2. audio-lingualism 3. communicative language teaching 4. total physical response 5. the silent way 6. community language learning 7. the natural approach 8. suggestopedia

64. ## Calc

For f(x,y)=x^2+y^2-xy+6y, determine the values for x and y such that fx(x,y)=0 and fy(x,y)=0 simultaneously.

65. ## physics

a 1.4 kg block slides across a rough surface such that it slows down with an acceleration of 1.25 m/s2. What is the coefficient of kinetic frisction between the block and the surface?

66. ## math

how many licks does it take to get to the center of a tootsie pop?

67. ## overt vs. covet

what is an overt behavior??? what is a covert behavior??? what is the difference between overt and covert behavior??? how to assess a person with this kind of behaviors??? thanks a lot for having your time to answer this question...

68. ## math

can someone help me do The sum of 2 consecutive integers is equal to their difference.

69. ## Social Studies: Jim Crow Laws

How did Jim Crow laws affect the economy?

70. ## Science

Are nodes in a standing wave the result of constructive interference?

71. ## CALC

What are local extrema?

72. ## Algebra

Simplify: 2p^5/p^4

73. ## Science

Are nodes in a standing wave the result of constructive interference?

74. ## Gov

Political socialization, of these five, which would you consider the one that has the most influence.. family, organizations, peers, events, or media

75. ## science

Can anyone describe what this question means... Describe the big idea of in energy transfer in The Greenhouse effect

76. ## Social Studies

what is the role of interest groups on the average American and elected officials.

77. ## math

Bob invested \$25,000, part at 2% and part at 9%. If the total interest at the end of the year is \$1,060, how much did he invest at 2%? A) \$8,000 B) \$18,000 C) \$17,000 D) \$16,000

78. ## Social Studies

what is the role that the mass media plays on the formation of political ideals?

79. ## MATH-HELP

1.THE PERIMETER OF A RECTANGLE IS TO BE NO GREATER THAN 300IN.,AN THE LENGTH MUST BE 125IN.FIND THE MAXIUM WIDTH OF THE RECTANGLE. 2. 3X-2Y=6

80. ## IB Biology

We are currently learning about innate & learned behaviors. An experiment was done where mallard, pintail & teal ducks were crossbred. These ducks live in the same habitat and could interbreed, but rarely do due to different courtship displays. When they

81. ## physics

A 5 kg book sliding on the floor with initial speed 20 m/s comes to rest in 100 m. What is the magnitude of the frictional force acting on the book? The answer is 10 N, but how do you arrive at this answer?

82. ## Social Studies History

What kind of homes did the Cherokees live in?

83. ## Math

Solve for the unknown. s/12.0 = 4.0/0.8

84. ## Phy

When light passes from air to glass, the light may change direction due to refraction. T or F?

85. ## AP Physics<<help

A 1.7 kg bundle starts up a 30 degree inlcine with 105 J of Kinetic Eneergy, How far will it slide up in the plane if the coefficient of friction is .3 ?

86. ## Science

In water waves, does the disturbance consist of fluctuations in the density of water? Thanks

87. ## Algebra

how many points are needed to dtermine a line

88. ## Social Studies Cherokee

What contributions have the Cherokees done?

89. ## GCSE Biology

How will a point mutation affect the fermentation of a protien? thankyou!

90. ## World History

Provide websites on Martin Luther (Protestant Reformer). I need viewpoints, so a viewpoint of the pope at that time would be great. The pope was against him, so I need sources that are against Martin Luther and his motives. Please provide me some credible

91. ## Calculus

Use the binomial Theroum to expand the expression and express the results in simplified form (3X + 2)^3

92. ## physics repost

Three masses are aligned along the x axis of a rectangular coordinate system so that a 2 kg mass is at the origin, a 3kg is at (2,0) m, and a 4 kg mass is at (4,0) m. Find (a) the gravitational force exerted on the 4 kg mass by the other two masses and (b)

If deep-sea divers rise to the surface too quickly, nitrogen bubbles in their blood can expand and prove fatal. This phenomenon is known as the bends. If a scuba diver rises quickly from a depth of 25.0 m in Lake Michigan (which is fresh water), what will

94. ## science

thanks for all your help!!! :P

95. ## math

how do I compute sales tax? \$1,367.85. sales tax rate is 5.75%. also, how do I add in city tax?

96. ## Algebra

Rewrite into standard form (0,5), m=-3/5. Write the equation of the line passing through each of the given pairs of points. Write the answer in slope-intercept form, where possible. (2,-3) and (2,4)

97. ## German

True or false: The Reichstag refers to the legislative body or Congress in Germany. ??????????????????????????????????

98. ## Math

Find the exact value of sin(pi/24) So like i need like the value like sqrt3/2 but for pi/24... also if you could show me the steps so i could figure the rest out, that would be cool

99. ## Social Studies history

What are some things that the Cherokee have contributed to..? Or what are their contributions?

100. ## Photo Essay Reflection

I have to write a reflection on a photo essay about the Great Depression for English class. It(the reflection) is supposed to explain how the photos show the conditions of the Depression and it is also supposed to relate the photos to the life of the

101. ## Calculus

For the demand function find the elasticity function. Problem 52. p=D(x)=18-Sqrt[x] My answer is [-36x^1/2 + 2x]/x However, the answer in book is [-2(18-x^1/2)]/[x^1/2]

102. ## Photo Essay...

Ummmm.... Sorry, I forgot to mention that I am already about halfway through it, and I can't seem to get back into it. Being a reflection, it is fairly informal, so I simply describe the photos and then explain their meaning. I just always seem to veer

103. ## science

how can i neutralise acids and alkalis

104. ## Calc

Hi! Please help :-) Find an equation for the circle of the curvature of the curve r(t) = ti + (sint)j at the point (pi/2, 1) (The curve parametrizes the graph of y = sinx in the xy-plane)

105. ## statistics

a sales manager used linear regression to find the positive linear relationship between advertising expenditures and sales. The amount of advertising expenditures used to generate the regression equation ranged from \$8,000 to \$45,000. The sales manager

106. ## biology

Which enzymes are for breaking down hydrogen peroxide into oxygen and hydrogen gases? Explain your answer using your results. Can more than one enzyme be used to perform a particular reaction? Why or why not?

107. ## chemistry

in dealing with alcohol mechinisms, how do you know when to do dyhydration (elimination) or substitution? is it secondary and teritary undergo both Sn1 & E1 and primary undergo Sn2 and E2. or is one mech actually preferred? it seems like H2SO4 is always

108. ## Calculus

Given the function f(x) = (x-2)/(x^3-8), what value should be assigned to f(x) to make the function continuous at x=2? Please walk me through this. I have the answer but do not know how to get it.

109. ## world history

What was the response of the papacy towards Martin Luther? Give me the papacy's side of the story, their viewpoint. Include sources that proves martin luther guilty. It will be best if it is from the point of view of the papacy, specifically the pope or

110. ## Sociology

To what extent do sociologists agree that an underclass exists in britain ?

111. ## science

A 2.747-g sample of manganese metal is reacted with excess HCl gas to produce 3.22 L of H2 at 373 K and 0.951 atm and manganese chloride compound (MnClx) what is the formula of manganese chloride compond produced in the reaction?

112. ## Calculus

solve the equation for y in terms of x. Can somebody walk me through this?

113. ## Government

How do judges make laws? How does the legislative branch influences the process of congress?

114. ## Calculus

Find the integral, using the method of substitution where necessary. 63. integrate x^2*Sqrt[x+1] dx What I have done: I have set the (x+1) = u but I feel this is the wrong way to do this problem.

115. ## physics

Three masses are aligned along the x axis of a rectangular coordinate system so that a 2 kg mass is at the origin, a 3kg is at (2,0) m, and a 4 kg mass is at (4,0) m. Find (a) the gravitational force exerted on the 4 kg mass by the other two masses and (b)

116. ## history

Two hindrances face by monarchs who wanted to be more enlightened in the 18th century?

117. ## science

My teacher wants us to find another name for winter. Can anyone help me?

118. ## us history

how to write a bill

119. ## english/history

How have our romantic ideals today as evidenced by films stories magazines popular cultre and the media have been influenced by chivalry of the Middle Ages? Examples please?

120. ## Didn't do research paper

I have a research paper due TOMOROW that my English teacher assigned 2 weeks ago. I waited until Friday to start thinking i could rush it, but so far I have nothing. I did tons of non-stop research and got to page 2 when I realized I was "writing in

121. ## physics

At the end of the semester, you are loading your gear into a van to go home. In loading the van, you can either lift a 45.0-kg crate straight up(method 1) or push it up a 3.00-m-long ramp that is inclined at an angle above the horizontal (method 2).In both