Newest questions posted by Dean
  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

    Use f(x) = 2x + 5 and g(x) = x^2-1 to determine the following( simplified where possible): (g * f)(3)
  6. 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
  7. 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)
  8. 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
  9. 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
  10. 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
  11. 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
  12. science

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

    $2,000 principal earning 3%, compounded annually, after 3 years.
  14. 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
  15. math

    Two digits over two digits equals three digit decimal (_.__) Can only use 0-9 once
  16. 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
  17. Biology

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

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

    Could you please give me some details about SAT scholarship exam?
  20. 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
  21. 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?
  22. 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
  23. chemistry

    Calculate the volume 2.3g of oxygen gas at 28 degrees celcius and 2.321 atm
  24. 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
  25. Geograph

    Where is Indonesia ?
  26. 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
  27. 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?
  28. 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?
  29. 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?
  30. 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.
  31. math

    Jake has $2.80 in dimes and quarters. he has 7 more dimes than quarters. how many quarters does he have?
  32. 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?
  33. 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
  34. 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
  35. 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?
  36. 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.
  37. Surveying

    I am looking for horizontal distance between 2 points. My slope distance is 153.97' and a vertical distance of 91degrees 32minutes 45seconds.
  38. 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?
  39. 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
  40. 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
  41. 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
  42. math

    how to go by doing a personal cash flow statement is it like the regular budgetfor your house.
  43. 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!!! :)
  44. 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
  45. math

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

    what is the future value of $2,000 in a bank account for 6 years at 4 percent compounded bimonthly
  47. 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
  48. 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
  49. 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
  50. math

    if a 1100 lb motorcycle(w/2 passengers)is doing 40mph,how long will take to come to a complete stop?
  51. 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?
  52. 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
  53. calculus

    Evaluate integral from -2 to 3 of 4 lxldx
  54. 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.
  55. 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?
  56. 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
  58. 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

    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
  60. math

    how do you add a negetive and a positive faction? -5/8 + 2/9 = ?
  61. 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.
  62. 8th grade

    Solve 3r + 18 ¡Ü 6r
  63. 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
  64. 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?
  65. 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
  66. Biology

    You are given the following protein sequence: NH2-Met-Trp-Trp-Met-Trp-Met-COOH What was the sequence of the mRNA? You must write your answer 5' to 3' direction, starting with the first nucleotide of the mRNA and ending with the last nucleotide of the mRNA.
  67. Philosophy

    Choose the pair of words/phrases among the choices that exhibits the same logical relationship as the words/phrases in the following pair. building : blueprint (Points : 1) ship : sea cake : recipe bridge : island guitar : song
  68. algebra

    it has been found that the world record for the men's 10,000 meter run has been decreasing steadily since 1950. the record is approximately 28.7 minutes minus 0.05 times the number of years since 1950. assume the record continues to decrease in this way.
  69. Calculus

    A kicker is setting up for a field goal. The goal is 120 feet away and 10 feet high. The kicker can give an initial speed of 75 ft/s to the ball. What range of angles of elevation are possible to kick the ball so it passes over the goal?
  70. Spanish

    Me gusta ver el ____ de b`eisbol No puedo jugar Estoy ___ ocupado Vamos a la ___ de cumplean~os de paco help on these last three please?
  71. Algebra (repost)

    Can you help me on this problem as well? (or anyone.) Solve each inequality and check your solution. h - > -7 4 (bumping)
  72. Algebra

    "Do the two inequalities have the same solutions? Wriet yes or no. -5x > 0 x > 0 Solve each inequality and ch eck your solution. 9x > 81 help please? -thanks
  73. government

    what is Third way urbanism?
  74. philosophy

    What makes pity the such a horrible emotion? How is it counter to Nietzsche conception of the good? Please I don't know where to start!!!!!
  75. Philosophy

    What are the differences between phenomenal and noumenal worlds?
  76. Physics

    a) A microphone has an area of 5cm^2. It receives during a 4.0 s time period a sound energy of 2.0*10^-11 J. What is the intensity of the sound? b) using intensity from a) what is the variation in pressure in the sound wave, delta P ? Use T=293 K and
  77. Pre-Algebra

    Directions: Find the missing measure of each angle How do I do this? It's a triangle, angle one 2x + 15 x 45degrees
  78. Pre-Algebra

    Please help me. Thanks It's Pythagorean Theorem: A boot leaves port and travels 18 miles north and 15 miles east. How far from port is the boat? I have drawn a picture, 15² + 18² = c² ²= squared. Thanks... meh please someone help mewith this, thanks.
  79. Pre-Algebra

    A 9 foot ladder leans against a building at a point 7 feet above the ground. At what height would a 15 foot ladder touch the building if both ladders for the same angle with the ground? Propotion? But I just get a decimal...
  80. Pre-Algebra

    Well, this problem is really stumping me, so here it is. Directions: In each problem, first draw a picture of the situation to the right of the problem. Then decide whether the problem involves measuring length or area growth to help you answer the
  81. life science

    how do fungi liv e without water and in extreme cold?
  82. how children learn

    which of the following questions ia a thinker/doer most likely to ask?
  83. skills for the effective teacher aide

    Acc to the SMCR model, problems in communication can arise when the speaker fails to do what?
  84. math,

    3/4 is= to something over 12
  85. Pre-Algebra

    Can I have someone check this please? I wouldn't want to do the whole page, then find out I had done them all wrong. :( [Percents of Change] A $100 digital watch is now $72 Decrease, 72/100 = negative percent. 100/72.00 = .72 .72 - 1 = 30%? Thanks. 30% is
  86. Pre-Algebra

    Is this correct? If I'm mistaken, please correct it for me, and show me how. Thanks. [Fractions, Decimals, and Percents.] 33 & 1/3 of $90 = $21.00 100% of 500 = $500 1% of 500 = $5.00 50% of 70 = $35.00 100% of 70 = $70.00 Thanks, you don't have to tell me
  87. Pre-Algebra

    I don't know how to do these problems. 33 and 1/3% of $90 66 and 2/3% of $90 199% of 70
  88. Physics

    The figure below shows a standard man intending to do reverse curls in a gym (standing up with Tension up, weight of arm down and force down). He holds his arms straight, using an overhand grip to hold the bar. If the mass of the bar is given as 146 kg,
  89. 7th grade Pre-Algebra

    Factor each number completely 110 480 I don't know how to do factor tree's, they're tricky, :\ Please help
  90. 7th grade Pre-Algebra

    OK !! I've asked for help so much, I've been on this site for 2 hours, and I still havent got what I wanted, :\ "Represent each expression using positive esponents" e^-4 f Would it just be 1/e^4f?
  91. 7th grade Pre-Algebra

    Represent each expression using positive exponents. 2. E(to the negative fourth power)f Would it be 1/e to the 4th power f?
  92. 7th grade Pre-Algebra

    Using the definition, 10(to the negative sixth power) = 1/10to the six power and x(negative2) = 1/xto the second power The definition also shows that 1/10to the six power = 10to the negative 6th power and 1/xto the 2nd power = x(negative2) I think that's
  93. 7th grade Pre-Algebra

    Simplify. (-5)-(-3)= Is it -8?
  94. Pre-Algebra

    Find the Product. (7y)(5z) I'm totally confused, 7 times 5 = -30yz? Next problem, (-10r)(5s) -10 times 5 = -50s
  95. 7th grade Pre-Algebra

    Find each Product. 8(-5x) Do I just do 8 x -5 = _n ?
  96. 7th grade Math

    I have two questions for math. How do I add/subtract an integer Please give me full notes, or webpage please. Also, my teacher said 10-20E (Problems in book we have to do) Is that evens? because the odd answers are in the back of the text book Thanks,
  97. 7th Grade Math

    {Decimals} Hi, I'm stuck on these problems, and I asked my family members, they don't know, so I've come to you, community! Please help, thanks. Directions: Round each decimal to the underlined place-value position. 4.2974 (seven is the underlined number)
  98. algebra

    suppose that D+E=A, that N/A=.25 and that D/A=0.15. Solve for N/E.

    S/A=7.25 N/S= .12 N/A= ?
  100. sociology

    G. William Domhoff's view of the power structure of the United States most closely resembles the analysis of which sociological perspective? Functionalist perspective Conflict perspective Interactionist perspective Global perspective it isnt conflict, or


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