Posts by Dean

Total # Posts: 212

  1. Chemistry

    What is the electron configuration of the element with 27 protons? Is it 1s2 2s2 2p6 3s2 3p6 3d7 4s2 or is that wrong?
  2. Chemistry

    What is the electron configuration of the element with 27 protons?
  3. Chemistry

    If an element has 12 protons and 17 neutrons, how many electrons does it have? I think the answers twelve but I'm not sure?
  4. Chemistry

    Explain why a model of the atom is crucial to understanding chemistry and in explaining the behavior of matter.
  5. Mathematics

    So for (g*f)(3) the answer is 88, right. I have two other: (f + g)(2), the answer would be 12, right and for last qs: f(g(x)), I got 2x^3 + 5x^2 - 2x -5 Could you please clarify steve if these qs are right. Thanks
  6. Mathematics

    Use f(x) = 2x + 5 and g(x) = x^2-1 to determine the following( simplified where possible): (g * f)(3)
  7. physics

    There is no picture given to me in order to solve this question. I think so bisector in this question line passing through the midpoint. Any idea what would be the answer
  8. Chemistry

    Potassium superoxide, KO2, is used for producing oxygen and removing carbon dioxide in selfcontained breathing units, space shuttles, and other enclosed spaces. First the potassium superoxide reacts with moisture to release oxygen and produce potassium hydroxide. Then the ...
  9. math

    Select all the expressions that are equivalent to 10w - 8 + 6 - 4w. 2(3w - 1) (6w + 3) + (2w - 7) 6w - 2 (11w - 1) - (5w + 3) 3w + 7 + 3w - 9 14w + 14 2(5w + 7)
  10. math

    Translate the following statement to an inequality. Then, find the solution. Four times the sum of a number and eight is greater than or equal to negative four. n ? -9 n ? -9 n ? -32 n ? -32
  11. math

    Translate the following statement to an inequality. Then, find the solution. Three times the sum of a number and five is greater than or equal to negative six. n ? -7 n ? -7 n ? -3 n ? -3
  12. calculus

    Ok but then how would I solve this problem?
  13. calculus

    Find the length of the curve given by the equation y= intergral from -pi to x of sqrt(cos(t)) dt for x between -pi and pi. I think I know to do this- at least part of it. I am using the fundamental theorem of calculus and the arc length formula, but I don't know how to ...
  14. science

    this is a follow up question from my last one with the exact question If you dissolve 200 g of salt in 20 l of water, what is the density of that solution of salty water? Hint: In this particular example, assume that the total volume doesn’t change when salt is added to ...
  15. science

    If I dissolve 200g in 20 litre of water what is the density of the salty water. please help
  16. MAth

    Do we like need to add them up?
  17. American Government

    B C D A B C D B D C
  18. Math

    $2,000 principal earning 3%, compounded annually, after 3 years.
  19. SS

    Which of the following responsibilities are held by the federal government? Choose all that apply. (2 points) protecting national parks administering healthcare providing Social Security managing intercity traffic creating garbage collection services chartering city ...
  20. History

    Just fyi everybody, Ms. Sue is total bull. She says bull answers and is never right. Don't ever take her sarcastic answers seriously just ignore her.
  21. math

    Two digits over two digits equals three digit decimal (_.__) Can only use 0-9 once
  22. Chemistry, Heat and Phase changes(general chem II)

    realized my mistake
  23. Chemistry, Heat and Phase changes(general chem II)

    From the data below, calculate the total heat (in J) needed to convert 22.00 g of icea t -6.00 C to liquid water at 0.500 C. melting point at 1 atm: 0.0 C Hfusion: 6.02 KJ/mol cliquid: 4.21 J/g C csolid: 2.09 J / g C My answer is about 300 J short of the correct answer. It ...
  24. dragon wings

    Thx amanda your answers really helped

  26. Algebra

    It’s funny. I’m talking to a messenger of God on a homework help website.
  27. Art

    CAS!! did you eat my pie
  28. Biology

    Suggest why Ia and Ib alleles are dominant over Io allele. Why in IaIo genotype, the Io allele is masked
  29. Life orientation

    Give five consequences that xenophobia have on comunities.
  30. exams

    Could you please give me some details about SAT scholarship exam?
  31. Algebra

    1. Tell whether x and y show direct variation. a. 5x - 3y = 0 b. x = y - 2 / 9 2. The variables x and y vary directly. Use the values to find the constant of proportionality and write an equation that relates x and y. a. y = 4; x = 6 b. y = 2; x = 10
  32. Physics

    A tiny source emits sound uniformly in all directions. The intensity level ar a dist. Of 2m is 100dB. How much sound power is the soure emitting?
  33. math

    Ted is helping his father plant their vegetable garden this year. They will put a fence around the garden. Ted measures the length of the garden, which is 6 feet. His father tells him that the width is twice the length. How much fencing do Ted and his father need to buy yo ...
  34. chemistry

    Calculate the volume 2.3g of oxygen gas at 28 degrees celcius and 2.321 atm
  35. Math

    Need help with this. A concrete path of width 1m and thickness 10cm is to be placed around you pool. Find the number of cubic meters of ready mixed concrete required to lay the path. Additional Info: pool area is 25.75 without concrete around it. I have completely forgotten ...
  36. Geograph

    Where is Indonesia ?
  37. Chemistry

    A solution is prepared by dissolving 25.0 g of pure HC2H3O2 and 25.0 g of NaC2H3O2 in 700 mL of solution (the final volume). (a) What is the pH of the solution? (b) What would the pH of the solution be if 65.0 mL of 0.650 M NaOH were added? (c) What would the pH be if 40.0 mL ...
  38. Physics

    Suppose you had a circuit with three resistors in series and you measured I=7.0 milliamps; V = 14.7 volts; V1= 3.5 volts and V2 = 1.4 volts. What would be the voltage across the third resistor? What would its resistance be?
  39. Physics

    Suppose you had a circuit with three resistors in series and you measured I=7.0 milliamps; V = 14.7 volts; V1= 3.5 volts and V2 = 1.4 volts. What would be the voltage across the third resistor? What would its resistance be?
  40. question/curiousity

    Theyre collaborating to write a children book
  41. question/curiousity

    A nurse decides to write a book, and a lawyer decides to illustrate the book.. what do the two have in common? my ans: Two potentially turn a hobby into a second career?
  42. Geometry

    Can you help me.the lengths of the sides of a triangle are in the extended ratio 3:10:12. The perimeter is 400cm. What is the length of the longest side in centimeters.
  43. Science

  44. math

    Thank you
  45. math

    Jake has $2.80 in dimes and quarters. he has 7 more dimes than quarters. how many quarters does he have?
  46. Science**updated asnwers**

    Thats a metaphor
  47. physics

    A block with mass m = 24.0 kg slides down an inclined plane of slope angle 41.4 ° with a constant velocity. It is then projected up the same plane with an initial speed 3.80 m/s. How far up the incline will the block move before coming to rest?
  48. physics

    Buffy is rolling along in her 12.7 kg wagon at 3.6 m/s (in the positive direction) when she jumps off the back. She continues to move forward at 1.2 m/s relative to the ground. This causes her wagon to go speeding forward at 9.51 m/s relative to the ground. How much does Buffy...
  49. physics

    A block of wood with a mass of 4.62 kg sits on the edge of a table that is 0.99 m tall. A bullet with a mass of 70.5 g traveling with a speed of 450 m/s is shot into the block and is lodged in it. Assuming that no energy is lost to friction, how far from the table will the ...
  50. physics

    A balistic pendulum is made from a block of wood with a mass of 2.78 kg. A bullet with a mass of 39 g is shot into the block causing it to rise 29.1 cm. What was the speed of the bullet?
  51. Electronics

    Why don't you simplify it then put it into an algebra calculator. then hire jericho before you rig up megaton to get into tenpenny tower. Fallout 3 ftw!
  52. Physics

    An electron is released between two metal plates 40.0mm apart experiences an acceleration of 1x10^12m/s^2. Determine the potential difference across the plates.
  53. Surveying

    I am looking for horizontal distance between 2 points. My slope distance is 153.97' and a vertical distance of 91degrees 32minutes 45seconds.
  54. statistics

    a random sample from the population of registered voters in california is to be taken and then surveyed about an upcoming election. What sample size should be used to guarantee a sampling error of 3% or less when estimating p at the 95% confidence level? is this the answer......
  55. statistics

    assume you have a data set from a normally distributed random variable. answer the following: will the random variable be discrete, continuous, or neither? How do you know? I believe its continuous but cant explain why will the data be qualitative or quantitative? How do you ...
  56. statistics

    A woman and her son are debating about the average length of a preacher's sermons on Sunday morning. Despite the mother's arguments, the son thinks that the sermons are more than twenty minutes. For one year, he has randomly selected 12 Sundays and found an average ...
  57. statistics

    What sample size is required from a very large population to estimate a population proportion within 0.05 with 95% confidence? Don't assume any particular value for p. A. 271 B. 38 C. 385 D. 767
  58. math

    2) binomial: n=6 p=0.48; x=6 using applet:1.22306% 1-1.22306%=98%
  59. math

    1)average=4; SD=0.2;sample =100 the expected total = 100*4=400 SE of total= sqrt(100)*0.2=2 (100*3.999-400)/2=-0.05 using applet:-5...-0.05 approximately 48%
  60. math

    1)average=4; SD=0.2;sample =100 the expected total = 100*4=400 SE of total= sqrt(100)*0.2=2 (100*3.999-400)/2=-0.05 using applet:-5...0.05 approximately 48%
  61. math

    how to go by doing a personal cash flow statement is it like the regular budgetfor your house.
  62. physics

    .14 T
  63. Algebra

    The volume of it is 1125 cubic inches, the length is 18 inches, and the width is 15 inches. Can you also show me how to do because I have a test on Friday! Thanks!!! :)
  64. Chemistry

    Thank you for a very good explanation! :)
  65. Chem

    in the reaction NO3+CaCl2=2AgCl+Ca(NO3)2, how many grams of excess will remain when 20 grams of AgNO3 are reacted with 15 grams of CaCl2
  66. Math

    I think it would be C but I'm not sure.....
  67. ap physics

    Awesome generated quite q bit of discussion. :)
  68. math

    how many ways can you arrange three banks on a shelf
  69. finance

    what is the future value of $2,000 in a bank account for 6 years at 4 percent compounded bimonthly
  70. Discreet MAth

    Wow hes actually right
  71. stat

    Did anyone answer this?
  72. Accounting

    Spencer Company manufactures and sells three products. Relevant per unit data concerning each product are given below. Product A B C Selling price $9 $12 $14 Variable costs and expenses $3 $9.50 $12 Machine hours to produce 2 1 2 Compute the contribution margin per unit of the...
  73. Accounting

    Imagen Arquitectonica of Tijuana, Mexico is contemplating a major change in its cost structure. Currently, all of its drafting work is performed by skilled draftsmen. Alfredo Ayala, Imagen's owner, is considering replacing the draftsmen with a computerized drafting system...
  74. Accounting

    E6-9 (a,b) Tiger Golf Accessories sells golf shoes, gloves, and a laser-guided range-finder that measures distance. Shown below are unit cost and sales data. Pairs of Shoes Pairs of Gloves Range Finder Unit sales price $100 $30 $250 Unit variable costs 60 10 200 Unit ...
  75. math

    if a 1100 lb motorcycle(w/2 passengers)is doing 40mph,how long will take to come to a complete stop? this is happening with a full brake lock up.skid!in a stright line.
  76. math

    if a 1100 lb motorcycle(w/2 passengers)is doing 40mph,how long will take to come to a complete stop?
  77. Physics

    A 170 -pF capacitor is connected in series with an unknown capacitance, and as a series combination they are connected to a battery with an emf of 25.0 V. If the 170 -pF capacitor stores 135 pC of charge on its plates, what is the unknown capacitance?
  78. calculus

    We need the given interval
  79. Algebra II

    f(-1)=(-1)^2 -(-1)+1=3 g(3) =-3(3)+6=-3 3 times -3 = 9
  80. math

    f(x) = y y = 2log(base2)x =log(base2)x^2 therefore 2^y=x^2 so x = sqrt(2^y)
  81. algebra

    g(-5)=-4(-5)+3=23 f(23) = -2(23)-7 = -53 (f o g)(-5) = -53
  82. math

    a boy buy a bike for 45$ then sells it for 65$ then buys it back for 90$ then sells it agian for 125$ what percent of money did he make
  83. calculus

    Evaluate integral from -2 to 3 of 4 lxldx
  84. stati

    12. Suppose 80% of students finish high school. Of them, 50% finish college. Of them, 20% get a master’s degree. Of them, 30% get a Ph.D. (i) What percentage of students get a Ph.
  85. statistics

    Assuming that the data are normally distributed with a mean of 45 and a standard deviation of 3.25, what is the z-score for a value of 40?
  86. french

    yes it that just not sure about the spelling
  87. algebra

    Find the slope, if it exists x+5y=10
  88. algebra

    Find the slope, if it exists x+5y=10

    Let a = 349, M = 492186. Show that gcd(a;M) = 1. Hence find the mutliplicative inverse, a^-1 mod M
  90. Math

    A company has factories located in New Jersey, Ohio, and Georgia where it manufactures handbags, shoes, and belts. How many days should the company operate each factory in order to exactly fill the order of 2150 handbags, 2300 shoes and 2500 belts? Use the information below. ...

    Discuss the three types of management styles that are reviewed in your course materials (Scientific Management, Human Relations Management, and Systems Management). * Which style do you believe would be the most effective to use in the criminal justice system? * What are ...
  92. math

    Thank you Sue! My daughter says she thinks she has it now. I hope she does, because I am till confused. You know its true what they say, It's hard to teach an old dog new tricks. Thanks again, Dean
  93. math

    I came out with a common denominator of 72. do I just put -5/72 + 2/72 = -3/72? I haven't done Algeria in 50 years. I am very rusty.
  94. math

    how do you add a negetive and a positive faction? -5/8 + 2/9 = ?
  95. algebra

    write a linear equation to model the situation. Use unit analysis to check your model. You borrow $40 from your sister. To repay the loan, you pay her $5 a week.
  96. 8th grade

    Solve 3r + 18 ¡Ü 6r
  97. science

    Actually, I really just need someone to confirm my answer. Not to confident b/c it's been a while since I've done much math. 22 ears x 700 kernels = 15,400 15,400 x 1000 = 15,400,000 /90 = 171.111 Am I close?
  98. science

    A farmer planted a field of Bt 123 corn and wants to estimate the yield in terms of bushels per acre. He counts 22 ears in 1/1000 of an acre. He determines that each ear has about 700 kernels on average. He also knows that a bushel contains about 90 000 kernels on average. ...
  99. Human Physiology

    A subject with a body weight of 60 kg was injected with 10 ml of a 1% (w/v) solution of Evans Blue. After 10 min, the blood was sampled and found to contain 0.035 mg ml^-1 of the dye. What is the subject’s plasma volume in litres?
  100. Biology

    During skeletal muscle contraction: Choose one answer. A. the A and I bands do not change length. B. cross bridges are formed between myosin and actin. C. minimal tension can be generated when the muscle is close to its normal resting length. D. the myofilaments change length...
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