# Questions Asked onApril 22, 2007

1. ## Chemistry

Hi, I posted yesterday with this lab question. "Calculate the molar amounts of NaOH used in the reaction with the HCl solution and with the HC2H3O2. I think I got the answer to that with the help that I received. I had 5 mL of HCl, and I was using .100 M

2. ## math

The amount of money in an account with continuously compounded interest is given by the formula A = Pert, where P is the principal, r is the annual interest rate, and t is the time in years. Calculate to the hundredth of a year how long it takes for an

3. ## Math

Let x represent the number which shows up when a balanced die is rolled. Then x is a random variable with a uniform distribution. Let x-bar denote the mean of the numbers obtained when the die is rolled 32 times. For samples of size 32, which of the

4. ## Science

The water in a beaker has a mass of 18g. Electricity is passed through the water for two hours. Afterward the water has a mass of only 16g. What happened to the missing mass? The water heated up due to the electrical current going through it, and some of

5. ## chemistry

the Ka for acetic acid, HC2H3O2, is 1.8x10-5 at 25 deg. Celsius. In a .10 M solution of potassium acetate, which of the following are true? I. [HC2H3O2] = [OH-] II. [H+] = [OH-] III. [C2H3O2-] < .10 M a. I only b. II only c. III only d. I and II e. I, II

6. ## math

Please help: A continuously compounded account starts with \$2500 in principal. The annual interest rate is 11.3%. What is the balance after 15 years? pert: Value= Principal*ert = 2500* e0.11(15) = 2500 * e1.65 wow. thanks

7. ## Physics - Torque

A student of mas 70kg wants to walk beyond the edge of a cliff on a heavy beam of mass 300kg and length 10m. The beam is not attached to the cliff in any way, it simply lays on the horizontal surface of the cliff top, with one end sticking out beyond the

8. ## calculus

The base of a solid is a circle of radius = 4 Find the exact volume of this solid if the cross sections perpendicular to a given axis are equilateral right triangles. I have the area of the triangle (1/2bh) to be equal to 2sqrt(12) (1/2 * 4 * sqrt12) I

9. ## math

what would the dimensions of a retangle be whose perimeter is 50(P=50)inches when the length is 2x-5 ane the width is unknown The width must be 25 - (2x-5) = 30-2x, since the sum of the length and width must be half the perimeter. You do not have enough

10. ## chemistry

what is the concentration of ions in 1.2 M aluminum nitrate solution Al(NO3)3 I count four ions )(one Al, three nitrate), so the conc of ions will be 4 times the concentration.

11. ## Science

A sample of water decomposes to make 4g of hydrogen gas and 32g of oxygen gas. What mass of water decomposed? How do you know? Hint: The water decomposes into ONLY hydrogen and oxygen, and the total mass does not change in the process. It's called the Law

12. ## calculus BC slope

consider the curve in xy-plane by x=e^t and y=te^(-t) for t is greater or equal to o. the slope of the line tangent to the curve at the point where x=3. all the answer choices are decimal points. a is 20.086, b is .342, c is -.005, d is -.011 and e is

13. ## math

I need help rounding 423,607,492 to the following place values. ten thousands million Please tell us what you think, and we'll be glad to comment on your answers. Starting at the ten thousands digit, it is now 07,492, so rounding it to the nearest, is one

14. ## CHemistry

what is the molecular geometry for the following elements A) SeB4 B) carbonate ion C) XeF5+ D) ammonium ion E) phosphorus trichloride can someone tell me if im right with my anwsers and if im wrong what is the correct anwser? a-trigonal bipyramid b-

15. ## Nutrition Ed.

Which one of the major concepts is Not included in the conceptual framework on which nutrition education is based? 1. Nutrition is how the body uses food. 2. Food is composed of nutrients required for health. 3. All persons need a variety of nutrients

16. ## math

I need to determine the value of eah underlined digit and its place value. 42,107,000 472,336 It should be the 2 in 42,107,000 4 in 472,336 Please tell us what you think those place values are. http://csd.k12.nh.us/~mdeno/images/pvchart.gif Here's a place

17. ## English

I have a Romeo & Juliet essay to be handed in 5 days from now. I mainly have to write about 'Act 3 Scene 1'. The structure paper tells me to 'Comment on the way Shakespeare contrasts the mood of this scene with the romantic atmosphere of the previous scene

18. ## Physics

A rotating door is made from four rectangular glass panes, as shown in the drawing. The mass of each pane is 85 kg. A person pushes on the outer edge of one pane with a force of F = 63 N that is directed perpendicular to the pane. Determine the magnitude

19. ## Algebra

One number is 6 more than another. If the sum of the smaller number and 3 times the larger number is 34, find the Two numbers. I have errored somewhere please assist 3x+x=6=34 4x+4x=2x=7 I need two find both numbers Your equation does not match the English

20. ## Physics HELP!!!!!!!!

The pressure and volume of a gas are changed along a path ABCA in the figure. The vertical divisions on the graph represent 4.0 x 10^5 Pa, and the horizontal divisions represent 4.5 x 10^-3 m3. The diagram is a upright rectangle divided into small squares

21. ## math age problem

four years agoslyvia was two thirds as old as alex was then. four years from now, she will be four fifths as old as alex will be. how old are sylvia and alex now? Let S be SylVia's current age. Let A be Alex's current age. You have two equations to be

22. ## calculus

The base of a solid is a circle of radius = 4 Find the exact volume of this solid if the cross sections perpendicular to a given axis are equilateral right triangles. The equation of the circle is: x^2 + y^2 = 16 I have the area of the triangle (1/2bh) to

23. ## STAT-discrete random varaibles

a driver passes 4 sets of traffic lights. the random varaible X is the number of traffic lights he has to stop at. the probabilty distribution for x is given: x 0 1 2 3 4 prob 0.1 0.2 0.3 0.2 0.2 a) find the upper quartile of the number of traffic lights

24. ## math

donna took 3hours to row 18 km upstream. her return trip took 1 hour less. find the rate of rowing in still water and the rate of the current. let the speed of her rowing in still water be x km/h, let the speed of the current be y km/h going with the

25. ## math

No idea how to do this. I looked in my book and there usually is a data set present to get the first, second and third quartile. The lifetimes of lightbulbs of a particular type are normally distributed with a mean of 392 hours and a standard deviation of

26. ## Math

Estimate each Quotient! 717/9 463/90 12.398/4.1 56.784/7.9 57.36/9.32 363.68/3.6 349/7.4 249/81 162.58/4.4 481.4/64 468.65/8.43 311.24/5.2 638/8.2 2,322/70 534.82/9.1 34.594/4.6 409.4/48.4 364.56/69.3 Problem Solving Jane makes 20 equal payments to buy a

27. ## science...plz help

What happens to the circulatory system when the red blood cells malfunction? and is there a disease with hemoglobin not taking carbon dioxide out of the body correctly or fast enough....plz plz help me..i really need this

28. ## Physics - Torque

Consider a rectangular block of mass 30kg, height= 3m, length = 2m. A force F is applied horizontally at the upper edge. The acceleration of gravity is 9.8 m/s^2. 1)What is the minimum force required to start to TIP the block? 2)What is the minimum

29. ## Community College

waht is the impact of a stock repurchase on a companys debt ratio? Does this suggest another use for excess cash? The correct subject in the subject line will get you help in a more timely manner, and will aid in not wasting the time of other teachers.

30. ## Chemistry

If a piece of metal at -20 degrees Celsius is added to an ice and water mixutre in equilibrium at 0 degrees Celsius, which of the following statements is true??? ( Note more than one can be correct) I. the amount of ice will increase II. the amount of

31. ## Chemistry

I am having trouble with the balancing the oxidation-reduction equations that are in a basic solution. This is the first one that I'm doing that's in a basic solution, and I can't get it! I get everything right except I get 2H2O instead of one on the left.

32. ## word problems in algebra

A square has sides of length 3x - 2 cm. Express the area of the square as a polynomial. would i write this as 3x-2cm^4 because there are foru sides sorry post went before i was done polynominial confuse me after thinking about what polynomial is suppose to

33. ## Chemistry

The multiple Choice Question: Determine delta G (free energy at standard condition s) for the reaction below, considering Kp = 8 at 25 degrees celcius. 2Ag -> B The answer Choices: A.-2.303 x (0.287) x (25) x log 8 [J] B.-2.303 x (8.314) x (25) x log 8 [J]

34. ## chemistry

How many electrons are transferred in the reaction of hydrogen peroxide with iron (II) ion in acidic solution to form iron (III) ion and water? i'm not sure if iposted this already... sorry if i did :) Fe^+2 ==> Fe^+3 + e 2e + 2H^+ + H2O2 ==> 2H2O Multiply

35. ## CHEMISTRY HELLPPPPP

which would be the best anwser here? my guess was D but i wanna be sure Ammonium nitrate is sometimes used as a high explosive which reason best explains this? A)extremely water soluble B)contains ammonium ions C)excellent commerical fertlizer D)contains

36. ## I NEED HELLLLPPPPP!!!!

Ive been looking all over and i cant find out if there is such thing as a carbon dioxide deficiency in hemoglobin (red blood cells)...i know theres an oxygen one called anemia but i really need one for carbon dioxide as a waste from the body....plz plz plz

37. ## lcm

find the least common mutlipe of 420 196 Break down each number into prime number factors 196 = 2*2*7*7 420 = 70*2*3 = 2*2*3*5*7 The least common multiple is the product of all prime factors that occur in both numbers 2*2*3*5*7*7 = 2940

38. ## world studies

Does the goverment have the right over education? Where in the constitution is education mentioned? Education was not inclued in the US constitution. Therefore, education was left to individual states. Thats what I though....Im doing an essay and that was

39. ## Algebra

I posted this yesterday but no one told me if my answers were correct. Can someone please check my answers. 1. Solve. –7x + 1 + 8x = x + 1 A) Identity B) No solution C) 1 D) 0 My answer: A) Identity 2.The length of one of the equal legs of an isosceles

40. ## eNgLiSh

If you have ever read The Five People You Meet in Heaven, do you know what the theme would be? I think it could be something like take the chances you get in life and use them because life isn't fiction, it's real, and sometimes you don't get a second

41. ## safety

In Japan what is the country doing to prepare for the types of disaster they may face? What agencies are in charge in this country.. Also I need to know the same thing for Sudan. What types of disasters do you mean, like health, natural, war, terrorism,

42. ## chem - dry ice activity

when you add dry ice to water, it seems to boil. why is that? You are then transfering heat from the liquid water to the solid dry ice, which sublimes gaseous CO2 into the water.

43. ## english

Hi. I know this might be kind of a stupid question, but I was wondering if a predecessor follows something or is before it? I thought it was after, but the dictionary definition makes it seem like it is before. Is it before because of the pre? Thank you

44. ## immigrants U.S.A

Immigrants U.S.A What do you want to know about immigrants to the U.S.A.? Since most of us are descended from immigrants -- who began arriving about four hundred years ago -- that's a lot of time and people. Please clarify your question and we'll try to

45. ## General Chemistry

I have two questions about this problem, I understand how it's supposed to be done but I don't understand how my teacher came to this answer, so I was wondering if somebody could confirm or deny his answer here's the problem. Below what temperature is:

46. ## CHemistry

The first step of the synthesis is described by the reaction below. When 1.200 g of Fe(NH4)2(SO4)2 6H2O is mixed with 13 mL of 1.0 M H2C2O4, the theoretical yield of FeC2O42H2O is ? grams im not sure what to do. do u convert 1.0M to grams first? by

47. ## CHEMISTRY HELLPPP!!!!!!

Water is often instrumental in promoting disproportionation reactions however, it cannot itself disproportionate? IS THIS TRUE OR FALSE????? Water does this "ionization" reaction to a very small extent 3H20 H3O+ + 2OH- This only occurs in 1 in 10^7

48. ## algebra

7(u-3)+2u=-30 expand the parenthesis to 7u-21 + 2u=-30 combine the u's, add 21 to each side.

49. ## Biology

How is the eartworm's digestive system adapted for extracting relatively smal amounts of food from large amounts of ingested soil

50. ## Spanish

What did Jorge Luis Borges fight for and what did he fight against? What were the measures he used to bring about change and was it peaceful or not...please do not say wikipedia because i cant find it in there thanks What you need will be in one of these

51. ## chem - dry ice activity

why does the dry ice form clouds of white vapor, especially when you blow on it? what is the vapor composed of? The vapor is water vapor, condensed, as a fog.

52. ## SPANISH

how did jorge luis borges change life today Thank you for using the Jiskha Homework Help forum. Please see the Spanish by Jackie for answers: http://www.jiskha.com/post.cgi

53. ## science

The specific heat capacity of the lava is 1600 J kg^-1 degres celsuis ^-1. when all the erupted lava cools from the eruption temperature of 1050 degrees Celsius to 15 degrees celsius, the heat released is 2 x 10 ^15 J. calculate a value for the total mass

54. ## Chemistry

If a piece of metal at -20 degrees Celsius is added to an ice and water mixutre in equilibrium at 0 degrees Celsius, which of the following statements is true??? ( Note more than one can be correct) I. the amount of ice will increase II. the amount of

55. ## algebra

_5x__ + _20__ x+4 4+x change the second denominator ot x+4 Now, they have the same denominators.. (5)(x+4)/(x+4) or 5 check this.

56. ## algebra

How do you solve 1/16=64^(5x-4)? thank you Notice that 16 and 64 are both powers of 2. 2^-4 = 2^6(5x-4) take log base 2 of each side.. -4=6(5x-4) solve for x wow, okay thanks!!! so its -.93?

57. ## safety

In Japan what is the country doing to prepare for the types of disaster (such as tornadoes, hurricanes, terrorism) they may face? What agencies are in charge in this country.. Also I need to know the same thing for Sudan. Try this and similar searches:

58. ## Math

Could someone please check my answers to this problem. Thanks! The license fee for a car varies directly with the value of the car. The fee for a car that is valued at \$19,500 is \$292.50. a)

59. ## Math

Would someone please check my answers to this problem: The license fee for a car varies directly with the value of the car. The fee for a car that is valued at \$19,500 is \$292.50. What is the constant of proportionality? My answer is: .105 cents per every

60. ## chem

how many ions do each produce when in a 1.0M solution CH3COOH Ca(NO3)2 NaNO3 NaCl H2SO4 To figure out this you have to be able to dissociate each one and multiply the amount of ions you get by the molarity. I believe NaCl would look like: Na+ + Cl- and

61. ## culture ethnics

how do you think an average american's perceptions of each group are created? Thank you for using the Jiskha Homework Help Forum. If I understand your question, most people tend to "stereotype" other ethnic groups. Often it is what they see in the movies,

62. ## Maths

you have to solve the following by finding the value of x and y. can u help please? x+3(x+1)=2x 1+3(x-1)=4 2x-2(x+1)=5x 2(3x-1)=3(x-1) 4(y-1)+3(y+2)=5(y-4) 3y+7+3(y-1)=2(2y+6) These are exercises in standard algebraic manipulation of equations. Basically,

63. ## red blood cells

when the blood doesnt clean out the carbon dioxide from the heart properly what is that defiecency called? or is it even a deficiency?

64. ## college

Hi, I would like to ask if there is someon who can recomend me a good university, for a person that wants to be a surgeon and what would be a good thing to get a major on? thanks in advance Talk with your high school guidance counselor. Then try to be

65. ## chem - dry ice activity

does the dry ice disappear more quickly in air or in water? can you explain why? supplement your explanation with a drawing of molecular behavior based on kinetic molecular theory What do you think and why? We shall be happy to critique your thoughts. The

66. ## chem help ASAP!!!!

What ions are very important for the proper !@#\$%^&tioning of biological systems such as nerves and cells? A)alkali earth metals B)hydrogen ions C)oxygen ions D)nitride ions E)alkali metal ions my choice is A or C can anyone help?

67. ## maths

input the following data into your calculator and obtain the best fit power regression function for y in terms of x, for the data x 1 2 3 4 6 y 18.0 14.3 12.5 11.3 10.0 choose the one option which most closely describes the power relationship between x and

68. ## science

rearrange this equation 2 make x the subect. 6y = 9 - 3x so first i add 3x to both sides which makes it 3x - 6y = 9 then do i divide both sides by 9 or wat?? can sum1 help me out here If they mean by "Make x the subject" the same as "Solve for x", then add

69. ## maths

Choose the two options which are true for all values of x 1) cos (x) = cos ( x – pie/2) 2) sin (x + pie/2) = cos (x – pie/2) 3) cos (x) = sin (x – pie/2) 4) sin (x) = sin (x + 4pie) 5) sin (x) = cos (x – pie/2) 6) sin^2 (x) + cos^2 (x) = pie would

70. ## Calc 121

Okay, how would you go about finding the area of a curve from 1 to 4, when y=2x+(2/(x^2))?? It's not like the problem I asked before because here, you cannot use substitution. I tried using 2x for u and x^2 for du but it won't simplify into a ln problem or

71. ## math

Sam took traveled 8 hrs to his sisters house. The return trip took 7 hrs because the speed was 3 mi/hr faster. What was the Sam's speed each way? I like to set up a chart for these kind of problems, they become very easy that way D=r*t , Distance =

72. ## math,correction

Is this correct now. Problem #1 solve by completing the square. 2x^2+8x+3=0 My answer: x=-2 +/- sqrt (5)/(2) Problem #2 solve by using the quadratic formula 5x^2+3x+1=0 My answer: No solution are defined. You are not completing the square. 2x^2+8x+3=0 x^2

73. ## math,correction & help

is problem number 1 correct Problem #1 factor completely. x^4 + x^3 -12 MY answer: (x^2-3)(x^2+4) or is this still factorable. Problem #2 i need someone to help me set it up for me to solve. If the sides of a square are decreased by 3cm, the area is

74. ## math

If a student needs an average of 70 or more to pass a course. She has scored 90, 76, and 66 on the first three exams. writing an inequality representing the score she must get on the last test to pass the course letting x be for the exam that's missing. on

75. ## Project Management

A Gantt Chart is good for planning but not an effective tool for control. Can you please let me know if it is true or false and why? The answer is "true". See "Advantages and limitations" at http://en.wikipedia.org/wiki/Gantt_chart It tends to give too

76. ## biology

What happens to the circulatory system when the red blood cells malfunction?

77. ## algebra

How do you solve 1/125=25^6x-5 please and thank you I read this as 1/125 = 256x-5 or 5-3=256x-5 Take the log base five of each side.. -3=2(6x-5) solve for x. What exactly do you mean by take the log base five of each side?

78. ## Algebra

Find two consecutive odd integers such that 5 times the first integer is 12 more than 3 times the second. I've gotten this far but confused as to what the two intergers are. 5x=3(x+2)=12 5x=3x+2+12 5x=3x+14 2x=14 2x/2x=14/2 x=7 Let n be first integer, so

79. ## Bio- Genetics Quest.

A freind of yours brings up the idea that, if a person's gene were all identified and sequenced, he would be able to tell everything about that person: what they look like, how they might act, even how they will progess in life, and how long they would

80. ## Information MGT

How can a prototype be used? Prototype are used for test and evaluation: Prototypes are useful in testing form, fit, and function. Also, sometimes, prototypes are used in the engineering of manufacturing lines for production.

81. ## spanish

Did Jorge Luis Borges benefit from his actions.... and also what repercussions have followed because of his actions and what is different today from him...i need specific information perferred..thx Please refer again to: http://www.jiskha.com/post.cgi

82. ## Math (Trig Question)

OK, I've been stuck on this question for like.. an hour. Prove how cos 2x = 1. Thanks for the help! Nvm... lol I got it. There was a typo. Sorry!

83. ## CHEMISTRY HELLPPPP

WHich of the following elements are semiconductors? Ge, Si, Te, Po, S, Al, Se, Ca i believe only Ge, Si, Te, and Se are semiconductors, can someone confirm this? did i miss or over look something

84. ## Chemistry

Which of these metals are important the the US economy and defense? Mn, Pt, Cr, Co, Pd, Fe i would say Cr Co Pd and Fe

85. ## Chemistry

Hi i kind of get these questions but i got stuck on this... What is the molarity of an H2SO4 solution if 0.25L of the solution contains 0.75L MOL of H2SO4? thanks again for yourself i really do appreciate it :) Molarity= molessolute/litersolution =

86. ## math,correction

are these correct now i hope? Problem #1 simplify (m^2)/(8) divided by (m^5)/(16) My answer: (2)/(m^4) Problem #2 multiply (3x-30)/(x^2-4x) times (8x)/(10-x) My answer: (-6)/(x) No. 2/m^3 (3x-30)/(x^2-4x)* (8x)/(10-x) 3*(x-10)*8x /(x-10)(-1)(x)(x-4) x's

87. ## Physics

Why are igloos made of ice, aren't they supposed to keep warm? Igloos are supposed to protect from the outside temperature and wind. I will be happy to critique your thinking. Igloos are made of ice in regions where no other building materials are

88. ## Home-economics

What is self esteem? http://www.answers.com/self%20esteem?web.x=1 =)

89. ## cultural diversity

Which is the percent of immigrants going to U.S.A. and New York? I went to www.google.com and searched for immigration u.s. new york and found all kinds of results, helpful and not helpful! One of the helpful ones seems to be this:

90. ## Us history

I have a few questions that i have no idea... What were some of the factors that helped John !@#\$%^&ennedy win the presidency? What were the results of the bay of pigs invasion? How was the berlin crisis resolved? thanks again i just have no idea wat they

91. ## music

what is a whole note called Thank you for using the Jiskha Homework Help Forum. Perhaps you mean the "semibreve." http://en.wikipedia.org/wiki/Whole_note

92. ## biology

Ok i have a project Im doing on the red blood cells and I need to know how the blood cools down the body.... It depends. If it's colder than your body temp (say 70 degrees) then as the blood circulates close to the surface (near the skin) it looses heat to

93. ## also...

also is it true that the nervous system needs the blood to circulate better so it could get to the skin and help the nerves work correctly.... Yes, the nervous system needs blood to make the nerve cells operate. See:

94. ## vocab

i need 3 more sentences using nimble! plz help! Go to http://www.answers.com/nimble and read some of the sample uses (usually partial sentences) there. They will give you good ideas. =)

95. ## math

estimate each qoutient I suppose you are referring to your next posted question. Refer to my answer there.

96. ## Enlgish

I have to write a 1000 word essay on how I am going to be effective, today, tomorrow and for the rest of my life. What are some qualities and stuff to be effective? Think about -- honesty, hard work, common sense, values, intelligence, knowledge, love,

97. ## factoring numbers

If 6 an 10 are actores of a number, name the four other factors of the number 5,3,2,12 who do you get that?

12.

99. ## CHEM help NEEDED

Match the following properties to the appropriate element listed Elements a) fluorine b) chlorine c) Bromine d) iodine Properties 1. has largest anion 2. is the most electronegative 3. has the highest bonding enery 4. is a liquid at room temperature i

100. ## Japanese

Please someone tell me a good way to understand Japanese sentence structure and how to know what particles to say after each verb and etc. Please give me a breakdown that will make learning Japanese so much easier. Thank you for using the Jiskha Homework

101. ## Math

Could someone please answer these questions for me. It is for a grade and due on Tuesday, 4/24/07. The license fee for a car varies directly with the value of the car. The fee for a car that is valued at \$19,500 is \$292.50. a) What is the constant of

102. ## Information MGT

What are some of the methodologies commonly used for requirements elicitation? website would be welcome also.

103. ## Calculus

Find the equation of the tangent line to the graph of f(x)= (8x^2-3)/(x^2+4) at the point where x=-1. Take the derivative of f(x). That gives you m, the slope. Then, y= mx + b Put in x,f(x) for x,y. Calculate b. I get it now. Thanks for your help!

104. ## Help

I must be doing something incorrectly. When I submit my question, all of it does not appear. Again, here is my question:

105. ## eNgLiSh

If you have ever read To Kill a Mockingbird, Of Mice and Men, or The Five People you meet in Heaven, please leave a post b cuz I have some questions that I need help on thank u in advance LOL- lots of luv, Brie To Kill a Mockingbird:

106. ## To Amiya and all students

Please remember NOT to post personal information nor to include your full name. These are not Internet-safe practices. Thanks. =)

107. ## math

A variable is normally distributed. 42% of the possible observations of the variable lie between 20 and 28. What information does this give you about the graph of the normal curve for this variable? I am not sure how to exactly explain this. The only thing