Most popular questions and responses by bobpursley
  1. algebra

    You can compute the cost of 5000, and 5001 mowers from the formula, then subtract. Another method is to take the derivative of the cost function with respect to n, giving you the cost per mower... C=200n+150000 dC/dn=200 dollars

    asked on July 5, 2005
  2. hayley

    Hayley, I have read a number of posts of yours, and noticed two things. a. you worry about grades far too much, after all, we have an entire life ahead of us. Perfection is not on the cards for most of us. b. you have an issue in reading comprehension, in

    asked on August 15, 2017
  3. Math I really need help! A group of students decided to look at rectangles that are spuare. They find that no matter what size square they drew, every square was similar to shape B in the Shapes Set and to all other squares. They

    asked on December 4, 2006
  4. Physics

    Archimedes principle. The weight of the bouy is given, so the weight of water displaced by the submerged part of the bouy equals that. Figure the volume that weight of water displaces, then figure the height of a .33m diameter column of water will have of

    asked on December 4, 2006
  5. Thomas Jefferson I am having difficulty answering a question pertaining to how Thomas Jefferson influenced the constitution of the US. First, he wasn't even at the convention, he was in France so I am trying prove the

    asked on November 1, 2006
  6. geology

    Natural causes? Erosion, from wind and water. I cannot seem to find any specific natural causes of sand deposition. I have read all of my chapters and google searched "sand deposition" and can't

    asked on June 14, 2007
  7. Biology Imagine you had made an RNA copy of each strand of a DNA double helix. If you were now to mix these two RNA single-strand copies together, do you think they would form a double-stranded RNA

    asked on August 5, 2007
  8. English--Priss

    Is it alright to ask a question again and again until you get the answer you want? Goodness, you have been responded to, and several of us read that and did not have diverging views from what Writeacher stated. If you did the research, did the analysis,

    asked on February 6, 2011
  9. To helper

    Did you know that the best help you can give a student is NOT to do the problem for him, but to lead them to a solution. You can do this by example, or hints, or setting up the problem. Giving it away makes it worthless, and does not help the student

    asked on January 19, 2011
  10. physics

    Draw the figure, and calcuate the height above the bottom point the swing starts. (I remember it as 2.3(1-cos25)). the initial energy is mg*height. The final energy is 1/2 m v^2 The difference is frction. A 49 kg child on a 2.3 m long swing is released

    asked on February 28, 2007
  11. y912f

    I think I remember you wrote a short essay on this, and I commented that the economics is silly. Here is one the payback period is 88 years, but the panels only last 30 years. This is typical.

    asked on March 20, 2010
  12. english

    A life skill is something you need to get along in the world. Lifeskills: Typing. Matching clothes. Driving. Learning to bank, and use a check book. Writing a letter. Reading. Learning to search with Google. Learning to use the card cataloge at the

    asked on May 17, 2007
  13. Science

    Postive charges move when they are attracted to negatives, or when they are repelled by another positive. in What Situations can positive charges move? Put 2 magnets 2gether. Or u can look @ ur science textbook or w/e. lalalalalalalalalala. That's my name!

    asked on May 6, 2007
  14. Math

    What is 5/8 + 4/7 -1 ? I can't understand this math problem.... Please help me.... ------------------ Problem: In a boys' school, 5/8 of the boys play football and 4/7 play rugby. If every boy plays at least one of the two games, find the fraction of the

    asked on July 6, 2007
  15. about Engineering

    Electronic and Communication Engineering is mainly Mathematical analysis, implemented in practical circuits. You have to understand higher forms of math, and think in those terms. You have to understand the imperfect models used for systems analysis. You

    asked on May 24, 2007
  16. Question-- thematic units

    I can think of how A) would be correct...take for instance a thematic unit in the fourth grade on explorers...cross culturial activities would be desired. But it does not fit enzyme reactions in the Kreb's cycle. Can someone please help with this question?

    asked on April 2, 2007
  17. y921f: Descriptive essay

    I cant find the post I intended to add to, so I am here. Descriptive essays take many forms, and you can do much with it. It would do you great advantage to just stop a second and read two of my favorite, by great authors. Each is different, and

    asked on October 20, 2009
  18. geometry

    There is no need to ask the same question over and over. How do I find the vertex angle of an isosceles triangle with base angles of (4x-9) and (3x+2).

    asked on August 16, 2007
  19. physics-heat

    One cant solve this without knowing the time involved, or the mass of steam. steamers are vessels you can use to cook food in steamer gains heat as the steam condenses on it.a boiler supplies steam at 105 degree to a steamer at the tare of 445 g

    asked on April 3, 2007
  20. calculus

    Jena. Stop it, or you will be banned. Using the chain rule, how do i solve this problem? g(x)=(sin3x)^3 g'(x)=?? 3sin(3x)^2 • 3 i think *w*w*w*.*a*s*k*.*c*o*m* hey i cant help but heres a hint just go 2 (go on the words w/ the stares around them )and ask

    asked on February 21, 2007
  21. bobpursly,.math

    Ok, assume it equals zero. 2x + 3y -6=0 subtract 3y from each side. add six to each side. divide both sides by two. its how its in the book i'm suppost to solve for x. but how? How do I solve for the following: Directions solve each literal equation for

    asked on December 19, 2006
  22. english

    You need to explain applications: I assumed you were describing visa applications. Should applications from certain countries be given priority? College applications? This is a sensitive subject but in my opinion, yes. I found it extremely valuable to

    asked on October 29, 2006
  23. math,correction, bobpursly

    Since when is 5^7 =8125? if a number is a multple of ten, that means the last digit is zero. The leading digit cannot be zero. 9*10^5*1 on c, again, the leading digit cannot be zero. d is right e. no leading zero is allowed. 9*9*8*7*6*5*4= ? can someone

    asked on July 6, 2007
  24. geometry

    Why did you wait until the night before the exam to realize you did not understand the material? At this point, if you are confused on all that material, all I can recommend is get a good night's sleep. okay so my geometry final is TOMORROW! and i honestly

    asked on June 5, 2007
  25. Chemistry

    They are all balanced ok, the main difficulty that I have is the second. Sulfur dioxide is highly soluble in water, most folks would have written the products as sodium chloride and sulfurous acid H2SO3, or as a minimum changed the gas to (aq) on the SO2.

    asked on May 17, 2007
  26. chemistry

    cooler water has more dissolved oxygen: hot water has hardly any at all. Oh, so they go to the bottom to get oxygen. Why does cooler water have more dissolved oxygen? Generally gases are more soluble in cold water than warm water. Think of an open coke can

    asked on April 19, 2007
  27. I need help missy and bobpusley

    Tides are caused by the Moon and Sun. So, they last forever. natural resources are replaced by natural processes given reasonalbe amount of time. Soil, water, forests, plants and animals are all renewable resources as long as they are properly conserved. I

    asked on April 17, 2007
  28. Math - Reposted - Mahi's question

    Fill the seven quart. Empty into the five quart, leaving two. Mark the 7 quart jar at that 2 quart level. dump the five quart contents. Pour the 2 quarts into the five, marking its level. Fill the seven quart to the 2 quart level where marked. Fill the

    asked on February 9, 2007
  29. Need help on my report on a famous Chemist Would you please help me with my report on a famous chemist, i need ideas on who i should do it on, and i need to identify his/her contributions to my life, and the report has to be one and a half to two

    asked on December 14, 2006
  30. science

    consumer science or chemistry What is the field of science if I am dealing with the problem which detergent works the best?

    asked on December 4, 2006
  31. MATH/ Check?

    Correct. what is pi The definition or the number? The number is 3.14159 but that isn't an exact number. pi doesn't have an exact number except by definition and that is in words and not a number. The ellipse in question above( is translated 4 units to the

    asked on December 4, 2006
  32. Business Law

    What was Bean's consideration in this alleged contract? Hall sponsored a boat race in which the first prize was advertised as 1 14-foot boat trailer and 20-horsepower motor. After verifying with Hall that the prises advertised were correct, Bean entered

    asked on November 13, 2006

    asked on November 4, 2006
  34. math, bobpursly

    I don't know what the -4)colors means. Models*exterior colors*upholsterytypes*numberinteriour colors. Multiply them out. what do i have to do to solve for this one i have no idea i was low on the first try... An uto mobile manufacturerr produces 7 models,

    asked on July 6, 2007
  35. college algebra

    Isn't this a plug and chug? I will be happy to critique your thinking. Your equal signs in the function are not correct, I assume that is a typo. suppose a baseball is shot up from thr ground straight up with an initial velosity of 32 feet per second . A

    asked on June 10, 2007
  36. physics

    wet means lubrication. One of those is not wet. There is no difference in pulling or pushing. Think wet, or dry. Which of the following would require the greatest force to keep a 5.0 kilogram rubber block moving horizontally at a constant rate of speed? a.

    asked on June 5, 2007
  37. Physics

    Draw the figure. You have the following equations that you can write: a) Sum Vertical Forces=0 b) Sum horizontal forces=0. Remember that at the upper part of the ladder, there is a horizontal force (only). c) Sum of moments about any point, I suggest the

    asked on May 31, 2007
  38. math

    You have a difference of squares (x^2-3)(x^2+3) One of these factors to two real roots, the other to two imaginary roots. You have a difference of squares (x^2-3)(x^2+3) One of these factors to two real roots, the other to two imaginary roots. Let g(x)=

    asked on May 30, 2007
  39. chem??????????????????

    YEs, it is the correct balanced equation bobpursley A 2.80 mol/L solution of iron (II) dichromate is combined with 5.00L of a 2.25 mol/L acidic solution of tin (II) bromide. Calculate the volume of iron (II) dichromate required. FeCr2O7 + SnBr2 --> SnCr2O7

    asked on May 16, 2007
  40. math proportions

    The remainder is a fraction (remainder/divisor). Why don't you use a calculator...for instance, 31/7 is 4 r 3, but it is easy enought to just put 31 divide by 7 in the calc. I have to solve a proportion, and the answer I come up with has a remainder. I

    asked on March 13, 2007
  41. Area of circle.

    The area of the circle is radius squared times 3.14. That gives you an area in square feet. The volume of the tank is that area times depth. That gives you a volume in cubic feet. Your comment about fish per ft makes no sense at all. Did you mean 2 fish

    asked on March 5, 2007
  42. Physics

    1. It is incorrect. The friction has to equal the force down the plane...right? The trolley has no net acceleration, so it must have no net force. Net force= weight down plane - friction.

    asked on February 26, 2007
  43. Jena

    Stop the nonsense posts on this site. If not stopped, you wlll be reported to your service provider, and you will be banned. Her IP address is I have gone ahead and reported her: Location: United States [City: Seattle, Washington] AT&T

    asked on February 21, 2007
  44. Chemistry

    What atomic mass is equivalent to seven helium nuclei? What atomic number is equivalent to seven helium nuclei? Now subtract that from the atomic mass and number of ununhexium suppose the isotope of ununhexium ( find the symbol for this as well) undergoes

    asked on February 21, 2007
  45. Math Put the mean, and the standard deviation in the top of the applet. Having a lot of trouble with this one problem...any help would be appreciated The weight of the eggs produced by a

    asked on February 2, 2007
  46. HELP!

    How many times do I have to tell you the answer is d. Goodness. all you had to do was add two numbers given, and double it, and put the neg sign in front. I have no idea what the answer to this problem is,

    asked on January 16, 2007
  47. chemistry

    carboxylic acid plus alcohol yields ester plus water. It is an organic substitution reaction wot type of reaction is this CH3CO2H + C6H5CH2OH---------------> CH3COOCH2C6H5 + water is it like a substitution or like an addition or wot?

    asked on December 19, 2006
  48. need help on conversions

    Use the density of water: 1gram/ml= 1g/cm^2 looks like the volume of 1 cm^3 has a mass of one gram. 1 cm3 of water weighs 1 gm. would you help with converting 1cm3 of water to grams

    asked on December 14, 2006
  49. chemistry

    Molarity is defined as moles/volumesolution What is the molarity of a solution of silver perchlorate, AgClO 4 , if 3.2 moles of silver perchlorate is dissolved in 1.5 liters of water? Is it 2.133 M, 4.756 M, 4.8 M, or 4.810 M ? it is 4.756

    asked on December 7, 2006
  50. graphing-reposting

    It looks like a double ski ramp...going down, min, then up, then way down to the bottom of the hill, then up slightly, then down. The first minimum is greater than the small rise at the bottom Sketch the graph of a differentiable function y = f(x) with

    asked on November 6, 2006
  51. Help! Urgent!

    You know tangentTheta=h/4 take the derivative sec^2 Theta * dTheta/dt= 1/4 dh/dt you know dtheta/dt solving for dh/dt You know sec Theta from the right triangle: sec theta = sqrt(h^2 +16) /h check me. Georgina: in the future, please put the title in the

    asked on November 5, 2006
  52. PHYSICS: does anyone know how to do this???

    Take the weight of the child (mg), and break it into forces down the plane, and normal to the plane. down the plane mgsinTheta normal to plane mgCosTheta So friction is mu*mgCosTheta. Sliding down, the friction opposes it, so

    asked on October 1, 2006
  53. Physics

    tension in the cord is made up of weight mg, and centripetalforce directed outward. Add those as vectors to get tension. Period=2PIsqrt(l/g)

    asked on November 4, 2009
  54. Algebra

    take 1/2 of -5, and square it. Add that to both sides. y+6.25= x^2 -ax + 6.25 +3 y+3.25= (x-2.5)^2 Now, looking at it, wouldn't it by symmetrical abouut x=2.5? identify the axis of symmetry, create a suitable table of values y=x^2-5x+3

    asked on July 11, 2007
  55. History

    Have you thought of typing Helter Skelter into the Google Search engine? Amen! I lived in the general area when all that was going on, too, and it was just horrific. "Sub-human" is a good term for C. Manson, and it just breaks my heart that taxpayers

    asked on July 6, 2007
  56. COM 215

    Is that a sentence? Where is the verb? It certainly appears to be a sentence Fragement to me. How do I fix this sentence? With five gallons of gas. They are asking for punctuating sentences.

    asked on July 6, 2007
  57. science

    You can find this by Google searching on Kingdom fungi kingdom protoctista kingdom monera what are the common examples of the kingdom fungi, kingdom protoctista and kingdom monera?

    asked on June 19, 2007
  58. com 120

    search "peer review"in the search box above. i need some comments to share about peer reviews Peer reviews are helpful to the writer. They give the write honest feedback from a real audience before they are being graded. It is always helpful to have

    asked on June 14, 2007
  59. Can someone help me

    multipy both sides by 44x Then take the square root of each side. Math question here. Can someone solve this for me?1/x=x/44

    asked on May 21, 2007
  60. Science Question

    How can you post this under Science? The question is better asked in a grouping of adherents to magic, and fancy. Explain the nature and use of Vril energy. What are some of the potential dangers and drawbacks of the use of Vril energy in modern

    asked on May 15, 2007
  61. math

    y = log x If y = 10, then what is x? is this the answer y = log x 10 = log x 10 = 10^x x = 1 your second last line should say 10^10 = x so x= 10000000000 (assuming your base of the log x was 10) Hot stuff: Your IP address has been recorded. You have been

    asked on April 19, 2007
  62. Science

    What is your thinking? I Will be happy to critique your thinking. Which of the following is a chemical property of paper? A. Color B. Ability to Burn C. Size D. Thickness WELL I THINK IT I THINK ABILITY TO BURN CAUSE IT SAYS CHEMICAL PROPERTIE Well I think

    asked on April 17, 2007
  63. ALGEBRA 1

    change 50 to 25*2 sqrt 50 = 5 sqrt2 change 8 to 4*2 Nope: (sqrt3-sqrt5)(sqrt3-sqrt5). remember (a-b)(a-b)= a^2-2ab + b^2 Simplify.Express in simpliest radical form. 1.3sqrt2 +sqrt50 Cannot be solve. Terms have unlike radicals 2.3sqrt8+2 sqrt16 Terms have

    asked on April 11, 2007
  64. Hottie

    If you want to be banned from this site, keep it up. sorry about my brother. He always tries to get himself in trouble. My mom just banded him from the computer. Sorry and hope you can forgive him. SORRY

    asked on April 1, 2007
  65. Algebra

    First the slope. Perpendicular to a slope of -3 means a line slope of 1/3 y= 1/3 x + b. Now put in the x,y point and solve for b. write the equation of a line that has a y intercept (0,5) and is perpendicular to the line with equation y=-3x+1

    asked on March 11, 2007
  66. i need to know the major legal issues

    The statement " has been concerned about verifying payments...and also about the financial management..." is ripe for legal detail. Concern is not enough if one is in charge: follow on action is required. Responsibility is a serious legal word, and the

    asked on March 2, 2007
  67. i need to know the major legal issue

    And the lawyers want to know what is "fundamentally different" about it. Mr Brady's evidence is that he came up with the idea of having movements in each half of the split face watch case for the forward and return hand movements, all controlled by an

    asked on March 2, 2007
  68. science

    Wind does not blow upwards. This arrangement would encourage the female cones to pollinate with other trees. Some conifers bear female cones on the top half of the tree and male cones on the bottom half. Why do you think this arrangement of male and female

    asked on February 27, 2007
  69. stuck

    thirteen contains six letters. t, h, i, r, e, n A word I know six letters it contains subtract just one, and twelve is what remains cool riddle. twelves has six letters and subtract one(s) it makes twelve

    asked on February 25, 2007
  70. Algebra 1

    sqrt (10/2)= sqrt 5 Quotient Property: 2*sqrt10/2 I need to learn how to simplify the expression give me a problem and i can teach you

    asked on February 22, 2007
  71. Crystal

    Stop the nonsense posts, you are wasting our time, which is better devoted to helping kids. If you do not stop, your actions will be reported to your Service Provider and your IP address reported. Thanks.

    asked on February 21, 2007
  72. importent

    Post it. We will try. But we are not going to do the essay. this is due 2marro so i need ur help it's an essa on my biggest chalinge i was wandering if u coud do it by 2marrow and send is 2 but u must give it 2 me 2day so hurry o ya and it needs 2 be 2-3

    asked on February 21, 2007
  73. DrBob222

    Moth crystals. Those round moth balls are not foam, they are napthalene, a form of benzene. were could i find moth balls because the only one's i have at home are foam balls, or is there something else with an aromatic compound in it?

    asked on February 5, 2007
  74. science

    deltaL= L * coeff thermal expansion Al * delta Temp What is the linear expansion for 1 Deg F change in a piect of aluminum that is 1.9 inches long?

    asked on January 16, 2007
  75. Physical Science

    Most would expand, greater volume, lesser density. Density= mass/volume What would be true of the densities of most solids and liquids at a temperature higher than the quoted one?

    asked on January 9, 2007
  76. Inter. Algebra

    I find it curious here: a - b=2 in this case, rationalize by multplying both sides by a+b, getting a-b=2 a^2-b^2=2(a+b) 2x+3-x+2=2(a+b) (x+5)/2 = a+b now add the original equation.. 2= a-b or 2a= 2+ x/2 + 5/2 4sqrt(2x+3)= x+9 square both sides.. 16(2x+3)=

    asked on December 3, 2006
  77. Physical Education

    aerobic _______exercise: Rythmic, nonstop, moderate to vigorous activity that requires large amounts of oxygen and works the heart. What would be the word in the blank?

    asked on November 28, 2006
  78. Movie

    I suggest Rent the movie, it is available at Blockbuster. Remember the movie is a fictionalized portral of the fictionalized book. For my psychology class we watched the film "Awakenings". If any one has seen the film, I would appreciate some help with

    asked on November 18, 2006
  79. physics

    Two factors: 1) the weight of the car is now partially down the cable, it adds to tension: mgsinTheta is the component of weight pulling back on the cable. 2) going up you have mass*acceleration. Total tension: ma +mgsinTheta check my thinking, draw a

    asked on November 13, 2006
  80. math

    what is 6/12 the same as? 4/5, 1/2, or 4/7? find the equivalent fraction. 1/2 = 6/? six-twelfths is what fraction? ??i am only in sixth grade

    asked on November 8, 2006
  81. CHECK!!

    Robert: In the future, in the subject box, but the subject. In this case it could be English, or English, pls check Both slang and colloquialisms are acceptable when tow friends are speaking or writing to one another, but slang and colloquialisms are not

    asked on November 5, 2006
  82. electricity

    closed circuits allow current to flow. b b

    asked on August 23, 2005
  83. Electricity

    The best answer is c, but a is also true if the wavelength of the light is chosen correctly. The intensity of the light does not determine the emission of the electrons, the wavelength (energy of light photons) is what determines. c

    asked on August 20, 2005
  84. formatting?

    y squared is y^2

    asked on August 16, 2005
  85. health services

    It would depend on the someone, and the job. It wouldn't seem very valuable to the elevator operator in a hospital, or the chamber maid. But others have other opinions....and psychology wannabees will quibble over it. Do you think it is necessary for

    asked on June 25, 2007
  86. Science

    No, No, and not possible. ditto! Was the first hydrogen bomb test near a uranium or plutonium deposit? If so, could the deposit have been used as fuel if the test had been conducted in the area of the deposit? What kind of damage would we be looking at if

    asked on June 25, 2007
  87. Biology

    Some of it. Human digestion takes biochemical processes mainly enzyeme reactions) to break down food to extract energy and compounds. The enzyemes we produce are specific to particular bonds and molecules. Some of the food we injest cannot be broken down,

    asked on June 20, 2007
  88. Philosophy

    1. Watch out for metaphysics in searching for these answers: metaphysics depends on a magical intrepretation. 2. This link will get you started on these classical questions.

    asked on May 31, 2007
  89. math I have to draw a best-fit straight line on a graph. How do I know that its really best fitted - in the right angle?

    asked on May 24, 2007
  90. algebra1

    I will be happy to critique your thinking. can u use one of them and show me how to solve it and i'll do the rest? like i don't know how to do these and i need to know how. assume that Q varied directly as x and inversely as y. 1) if x is tripled and y is

    asked on May 23, 2007
  91. algebra

    It is not solvable by that method, shanaid. You have to get all the numbers on the left, set them to equal zero, and factor. which method is used to solve this equation. x^2-9x-4=6 I would factor, move the six over, then factor i would move the -4 over so

    asked on May 17, 2007
  92. Pre Algebra HELP

    I don't know exactly what you mean by typing like this 2y3(4x-3y). I assume that means 2y cubed (2y^3) or 2y3 times (4x-2y) That becomes 8xy3 -6y4 Expand all the parenthesis, then gather like terms, and add them. See

    asked on April 26, 2007
  93. Jose

    If you have a question about a response, ask about it. We are not going to do your homework for it. If you post vulgar posts, we have your IP address, and will ban you from here, and notify your web provider. Thanks. but i don't get what to do. and yet you

    asked on April 17, 2007
  94. math

    8:15::24:45 I need to write the following as proportions. If Maria hit 8 home runs in 15 softball games, then she should hit 24 home runs in 45 games.

    asked on April 1, 2007
  95. math

    It could be different. One is supposed to define symbols before one starts with a Let statement, as in Let B= a constant Let b= some other constant or let b=B I suspect it is a sloppy typographical error, so B+b= 2B or =2b in math is there a differenc in B

    asked on March 29, 2007
  96. riddle

    red. I rtyme with bed I am a color I am red Thank you for using the Jiskha Homework Help Forum. Here's the "key" to solving this kind of riddle. Walk through the alphabet rhyming with "bed." (ced, ded, fed, etc.) red

    asked on March 21, 2007
  97. science

    Which lily? What is its name? I am doing a project on a lily and i need to know if it reproduces asexually, sexually or both a lilium -lily

    asked on March 18, 2007
  98. English 1

    You might define National Civil Defense, whatever that is. Quickly go to your thesis statement. How should I start off an essay about National Civil Defense? oh yea...i forgot about my thesis statement!

    asked on March 14, 2007
  99. Physics/Math

    The Formula you use is the correct one. However, consider this. If the initial PE existed, wouldn't you have to add it to the initial KE then subtract the PE at some R from the center? We normally make ground zero PE level, but for this... Zero, a

    asked on March 11, 2007
  100. discrete math

    5= (1+4) (1+4)^n= 1^n + 2*1*4 + ...+4^n which is 1 mod 4 Prove that 5^n = 1 (mod 4) for any n >or= 1.

    asked on March 7, 2007


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