1. algebra

    Simplify. Do not use negative exponents in the answer. 12x-2y4 -3xy-7 There should be a line between like a fraction but it did not copy or paste. This is the answer I got 12 x^-2 y^4 = 12y^4/x^2 -3xy^-7 = -3x/y^7 it was wrong. 12x^-2y^4 / -3xy^-7 = 12/-3
  2. English

    Okay so I have decided to write about "Banning the use of telephones while driving(including calls/texts)" This is my last shot at the final to earn a B in this class and possibly an A. My opinion on this subject is that I believe that there should be a
  3. critical thinking

    Please post a substantive response to the following discussion questions by clicking on Reply: Think about the following stereotype. Would they invoke the same kind of images for everyone? Which are negative and which are positive? How do you think they
  4. English

    I need help on these four questions. I was sick from class one day and now I am very confused about what is happening in Romeo and Juliet. Here are the questions in need help with: 15. A foil is a character that highlights, through sharp contrast, another
  5. physics(URGENT!!!!!)

    A block of mass m=2 kg on a horizontal surface is connected to a spring connected to a wall (see figure). The spring has a spring constant k= 12 N/m. The static friction coefficient between the block and the surface is μs= 0.6 , and the kinetic
  6. Social Studies

    What is it meant by "A house divided against itself cannot stand"? Explain why President Lincoln used this phrase prior to the Civil War. The quote, "A house divided against itself cannot stand" was said by Abraham Lincoln prior to the Civil War. It means
  7. spanish

    Which African country has Spanish as an official language? I don't know if it is correct but isnt it Equatorial Guinea. I am not sure That would be correct. You most have a diffrent spanish class. You bet. I eaven a have a weird school. Thank you for using
  8. French for Mischa

    The first question I used to ask my students was "Why are you studying French?" They didn't always have the "best" reason but those that had a good reason, started with a great attitude and did well. In case they didn't have a good reason, I had a handout
  9. ESL

    I was observing a grade three class, and the teacher encouraged the student to record and depict a text to self connection they made while reading their chapter books during reading workshop. I was curios to find out why she simply didn't allow the
  10. college psyc. statistic

    A psychology student wanted to examine the value of predicting GPAs based on IQ scores. She recruited undergraduate students enrolled in an introductory psychology class and administered the IQ test (M = 100.260, SD = 12.985) and requested their GPAs from
  11. math

    A woman is sitting in a boat at anchor on a lake. Her boat bobs up and down once every 2.0·s. She notices that when the front of her 3.0·m long boat is at one wave crest, a second crest is at the middle of her boat, and a third is at the end. What is the
  12. Physics

    A loudspeaker diaphragm is producing a sound for 2.0 s by moving back and forth in a simple harmonic motion. The angular frequency of the motion is 8.55 104 rad/s. How many times does the diaphragm move back and forth?
  13. Physics

    A woman is sitting in a boat at anchor on a lake. Her boat bobs up and down once every 2.0·s. She notices that when the front of her 5.0·m long boat is at one wave crest, a second crest is at the middle of her boat, and a third is at the end. What is the
  14. DrBob222

    You are creating a transverse wave in a rope by shaking your hand from side to side. Without changing the distance that your hand moves, you begin to shake it slower and slower. What happens to the frequency? it decreases
  15. Physics

    2 trains with 132Hz horns approach one another. The slower train has a speed of 25m/s. what is the speed of the fast train if an observer standing near the tracks between the trains hears a beat frequency of 5.2 Hz?
  16. Physics

    At the same distance the noise of a sandblaster is 13 dB louder than a power drill. This means the the displacement amplitude of the sound waves from the sandblaster is how many times greater than that of the power drill if both sounds have the same
  17. physics

    a sound wave has frequency of 631 Hz in air and a wavelength of 0.54m. what is the temperature of the air? assuming the velocity of sound at 0 degree celcius is 334 m/s. answer in units of celcius.
  18. IT

    Can someone please help me start this? Using Shannon’s formula, calculate the data transfer rate given the following information: signal frequency = 10,000 Hz signal power = 5000 watts noise power =230 watts.
  19. science

    A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of . Determine the frequency (in hz) of the interacting photon.
  20. Finite Math

    Consider the pea data: # peas in pod 2,3,4,5,6 and frequency 7, 9, 5, 3, 1: a. find the mean, median, mode and midrange number of peas per pod. b. is the mean higher or lower than the median? What kind of skew does this indicate?
  21. programming

    Write a MATLAB program to create and output the touch-tone telephone signals (Dual-Tone, Multi-Frequency, DTMF) for the input numbers 0 through 9 (disregard the * and # symbols). When a user presses a button on a telephone set, a signal is produced that is
  22. Math

    This year, Ms. Nelson's class has 20 students. Which of the following statements must be true? I. This year at least two of these students have their birthdays on a Sunday. II. This year at least two of these students have their birthdays on the same day
  23. math

    In mathematics class, 30 students received an A on the third test, which is 125% of the students who received an A on the second test. How many students received an A on the second test?
  24. English

    Homework task (essay): to compare and contrast how Harper Lee's novel To Kill a Mockingbird and Tate Taylor's film The Help represent experiences within society. Would the structure be something like this (if not, please correct): Introduction Thesis
  25. Physics

    A 0.500 kg bead slides on a straight frictionless wire with a velocity of 1.50 cm/s to the right. The bead collides elastically with a larger 0.750 kg bead initially at rest. After the collision, the smaller bead moves to the left with a velocity of 0.70
  26. Chemistry

    I am completely lost in chemistry. Everything the teacher says sounds like a different language to me and I am usually really good in the class. Can someone help me do this problem please? An element "E" is present as 10E (The 10 is like an exponent to the
  27. cultural diversity

    Would (C)contractual commitment with the families or (D)cross-cultural competence be the best answer for this question? Ms. Harris's new class includes two Native American children,about whose families and tribe she gathers more information. Her use of
  28. Science

    I am writing a mock biotechnology research proposal for class and I don't know what I should make this research plan about. What are some of the most breaking scientific news, or diseases and issues in this field(biology preferred, or chemistry) that are
  29. physics

    The speed of radio waves is 3*10^8m/s, the same as the speed of light. If a spacecraft transmits a radio signal with frequency 3*10^9Hz, what is the wavelength of those waves?
  30. physics

    A sound wave has a frequency of 686 Hz in air and a wavelength of 0.50 m. What is the temperature of the air? -Find wavelengths for 20 hz: -Find wavelengths for 20,000hz:
  31. simple harmonic motion

    a simple harmonic motion is represented by x=4sin[3t+3.14/4].find the angular frequency and amplitude and what is the velocity and acceleration at t=1 second.
  32. Chemistry-Dr.Bob 222

    1. The rate constant for a second order reaction has units of L mol^-1 s^-1. What are the units of the frequency factor, A, for a second order reaction?
  33. Physics

    A pond is 12 metres across. The crests of two successive waves are 60.0 cm apart and they each move across the pond in 15 seconds. a)What is the velocity of the waves? b)What is the frequency of the waves? c)What is the period of the waves?
  34. science

    Light waves are traveling through glass. If the wavelength of some part of the light wave is 4 x 10-7 m and the frequency of that light is 5 x 1014 Hz, what is the speed of light through the glass?
  35. Physics

    A pond is 12 metres across. The crests of two successive waves are 60.0 cm apart and they each move across the pond in 15 seconds. a)What is the velocity of the waves? b)What is the frequency of the waves? c)What is the period of the waves?
  36. comparing fractions

    at Morris Elementarhy there are 45 students in each grade, four though six. In the fourth grade, 19 participate in sports after school. Two out of every six fifth grade play sports after schoo;. In the sixth-grade class, seven of every ten students are not
  37. reading

    1.I usually don’t like to admit this, but at one time I disliked history. My teacher, Mr. Wittmeyer, was wonderful, and the material seemed interesting. When I listened to his lectures, however, I inevitably drifted off, got called on to answer, and had
  38. Economics

    The country of New Zealand decides to take 50% of its nation’s lottery money and use it to buy 1,000 acres of common grazing land in every county upon which any New Zealand shepherd may graze their sheepfor free, no strings attached. Based upon what you
  39. Physics

    In an electric shaver, the blade moves back and forth over a distance of 2.2 mm in simple harmonic motion, with frequency 116 Hz. Find (a) the amplitude (in mm), (b) the maximum blade speed, and (c) the magnitude of the maximum blade acceleration. I got
  40. physics

    Two loudspeakers, A and B, are driven by the same amplifier and emit sinusoidal waves in phase. The frequency of the waves emitted by each speaker is 172 \rm Hz. You are 8.00 \rm m from speaker A. Take the speed of sound in air to be 344 \rm m/s. What is
  41. English

    I forgot to include the following sentences. I hope you can have a look at them as well. 1)Chaucer describes his appearance and profession. The merchant is a representative of the new emerging middle class in English medieval society. 2) Chaucer also wants
  42. math

    A loud speaker at a rock concert generates 102 W/m2 at 20m with a frequency of 1 kHz. Assume that the speaker spreads its intensity uniformly in all direction. (a) What is the sound level ( = ?) at 20 m? (b) What is the total acoustic power
  43. unscramble this word!!

    i need help unscrambling these words : slebsurs prusto tripcoa harbrub surgpassa bekrechuryl 2nd one- apricot 3rd rhubarb Is there a certain subject? asparagass-4th brussels sprout 1st huckleberry last one CERINOSMOG Okay.. so I am doing a math assignment
  44. phyisics

    A computer to be used in a satellite must be able to withstand accelerations of up to 23 times the acceleration due to gravity. In a test to see if it meets this specification, the computer is bolted to a frame that is vibrated back and forth in simple
  45. Cosmology

    Which of the following statements is not true of spiral arms: they tend to trail the rotation of the galaxy they are sites of star formation they are amplified by resonances between the epicyclic frequencies of stars and the angular frequency of the spiral
  46. Chemistry

    1) Calculate the energy. in joules, of a photon of wavelength 1.250x 10^3 nm 2) If 3.011x 10^23 molecules have a mass of 20.04 grams, what is the molar mass of the substance? Is it 40.07g/mol? 3) 47.5g of Boron contains __________ atoms of B? Is it
  47. math/physics

    A 8 kg mass is attached to a spring hanging from the ceiling and allowed to come to rest. assume that the spring constant is 40 n/ m and a damping constant is 3 N/m. At t=0 and external force of 2 sin(2t+PI/4)N is applied to the system. determine amp,
  48. Business Math 205

    Calculate the PRESENT VALUE ANNUNITIES. Round to the nearest cent when necessary. Annunity Payment:$500 Payment Frequency:(Every 3 months)Time Period YRS:(2)Nominal Rate%:(16)Interest Compounded:(Quarterly) Present Value Of The Annuity is What?
  49. physics

    A certain radar installation used to track airplanes transmits electromagnetic radiation of wavelength 7 cm. (a) What is the frequency of this radiation, measured in billions of hertz (GHz)? __________GHz (b) What is the time required for a pulse of radar
  50. Probability

    A college professor has been studying the relationship between the attendance habits of his students and the grades they earn in his courses. A breakdown of 200 of his students revealed the following: Attended regularly --- 160 Attended sometimes --- 40
  51. electronics

    Which of the following statements is true with reference to an L-C resonant circuit? (1) The impedance of a parallel L-C circuit is low at resonance and higher at frequencies above and below resonance. The impedance of a series circuit is high at resonance
  52. College Algerbra

    A student must leave for campus in 10 minutes or he will be late for class. Unfortunately, he is snowed in. He can shovel the driveway in 18 minutes, and his brother claims to be able to do it in 12 minutes. If they shovel together, how long will it take
  53. programming

    write a program that creates a list of employees objects of size n entered from user using list interface and a list class implementation and display all employees in list and print employee name with minimum salary and remove employee with minimum salary
  54. science

    A science teacher tells her class that their final project requires the students to measure a specific variable and determine the velocity of a car with no more than 2.5% error. Jennifer and Johnny work hard and decide the velocity of the car is 34.87 m/s.
  55. Math

    Your teacher has a large box containing an equal number of red and blue folders. There are 24 students in your class. The teacher passes out folders at random. Ten students receive a red folder. Compare the experimental probability of recieving a red
  56. Organic Chemistry

    In lab, we purified acetanilide through recrystallization. We did not have have time to test the melting point to check the purification, so we put the recovered crystals in a 50ml beaker, covered the top with parafilm with a few holes poked in the top,
  57. Physics

    The period of oscillation of a spring-and-mass system is 0.60 s and the amplitude is 4.1 cm. What is the magnitude of the acceleration at the point of maximum extension of the spring? I have too many unknowns to use the equation for frequency, period,
  58. Math

    Number of People You Have Known Who Were Victims of Homicide # of Victims Frequency 0 3944 1 279 2 97 3 40 4 30 Find the median. Note that the “4 or more” category is not problematic for it. I know that the median is the middle number. I got 1.5 but
  59. Chemistry

    Calculate the frequency of light associated with the emission from n=5 to n=4 in the hydrogen atom. I got -7.41 x10^13 Hz, but the answer would make sense if it is positive... So does this mean that when the electrons jump from n=5 to n=4, energy is

    The threshold wavelength of zinc is 390 nm. 1) Find the frequency of zinc 2) What is the work function in eVerything of zinc? 3) Zinc in a photocell is irradiated u ultraviolet light of 260 nm wavelength. What is the kinetic energy of the photoelectrons in
  61. Physics

    An electromagnetic wave has a wavelength of 6.2 x 10^14 m. What is the frequency of the wave? A. 2.0 x 10^6 Hz B. 4.8 x 10^-7 Hz C. 1.8 x 10^24 Hz D. 5.3 x 10^-22 Hz I got B..? When the currents in two parallel metal conductors are in the same direction,
  62. math

    Number of People You Have Known Who Were Victims of Homicide # of Victims Frequency 0 3944 1 279 2 97 3 40 4 30 Find the median. Note that the “4 or more” category is not problematic for it. I know that the median is the middle number. I got 1.5 but
  63. physics

    A stone is thrown into water pond forming 10 waves in 5 seconds. The diameter of the first crest is 13 m and the diameter of the last crest is 4m. Find a.the periodic time b.the frequency c.the wave length d.the wave velocity
  64. Physics

    An experimenter finds that no photoelectrons are emitted from tungsten unless the wavelength of light is less than 270nm. Her experiment will require photoelectrons of maximum kinetic energy 2.0eV. what frequency of light should be used to illuminate the
  65. Physics

    A 300g particle oscillating in SHM travels 11cm between the two extreme points in its motion with an average speed of 65 cm/s. a) Find the angular frequency b)The maximum force on the particle c)The maximum speed
  66. biology

    When the stereocilia of a hair cell in the inner ear bends, it causes: a. potassium ions to enter the hair cell b. you to hear low frequency sounds c. chloride ions to leave the basilar membrane d. all of the above
  67. physics

    A bat flying at 5.5 m/s emits a chirp at 35 kHz. If this sound pulse is reflected by a wall, what is the frequency of the echo received by the bat? ______ kHz (Assume the speed of sound is 345 m/s.) thanks for any help
  68. Physics 1

    A 2.5 meter long string vibrates as a 100 hertz standing waves with nodes at 1.5 meters and 1.0 meters from one end of the string and at no points between the two strings, which harmonic is this? and what is the strings fundamental frequency?
  69. social studies

    Present a cognent argument based on your critical analysis of the question posed, using appropriate psychological terminology: Imagine that you are a psychology student in a college introductory psychology class. Design an experiment using the follwowing
  70. Math

    The 24 students in Ms.Cleary's homeroom are surveyed. They are asked which of the several prices they pay for a ticket to the school fasion show Results: $1.00-20 $1.50-20 $2.00-18 $2.50-15 $3.00-12 $3.50-10 $4.00-8 $4.50-7 A. There are 480 students in the
  71. English

    Writeacher, could you please check these sentences on the same theme? Thank you. 1) He always sneezes, blows his nose, and can't breathe. I tripped over a step. I fell off and sprained my ankle. 2) I cleaned the wound (or injury???) under running water,I
  72. math

    In a class, 4/5 of the girls have brown hair. Of the brown-haired girls, 3/4 of the have long hair. Of the girls with long brown hair, 1/3 of them have green eyes.
  73. English(its related to business writing class)

    Hi I have to write Request Letter. The professor said becareful about these 2 points. 1. Use full block style. 2. Project a "you attitude." What does this both mean, can you explain to me in simple English, since english is my second language. :) Here's a
  74. Math

    What is 5/12 divided by 3/4
  75. Maths

    What is x^3-6x^2-x+30 divided by 4x-1? Please help x
  76. Algebra

    5/2 divided by 5/9 =
  77. math

    x^2+3x-10 divided by x-2
  78. math

    5/8 divided by y/9 = 1 1/8
  79. Algebra

    13 1/3 divided by 22 1/2
  80. Math

    What is 25 Divided by (-5)
  81. Maths

    What is x^3-2x^2+16 divided by x+2 Please help
  82. math

    x(x-3)+4= 3x^2 - 2(x+8) Divided by 3
  83. math

    how do u do this 60 divided by 8h
  84. math

    what is 2/3 divided by 3
  85. math

    36 divided by 8
  86. math

    8 divided by 1/7
  87. math

    what is 5/9 divided by 5
  88. Math

    11/16-(-3/4)^2 divided by 2/5 ^3
  89. Math, Please help :/

    I cant do this !! PLease help !! -y+12 divided by 4 > 8 PLEASE PLEASE PLEASE HELP!!!!! (:
  90. math

    6 2/3 divided by 3 1/8
  91. math

    24 divided by 4/5=??? I tried but i just could not get it.
  92. math

    What is -60 divided by -5.
  93. math

    What is 1/8 divided by 5?
  94. math

    What is -60 divided by -5.
  95. Algebra 1

    What is 6 divided by 3/5?
  96. Mathematics

    What is 3 divided by -1/2?
  97. algeabra

    what is x+7 divided by x-4
  98. Chemistry

    What is 6.35 g divided by 6.02 x 10^23
  99. math

    -8 divided by 3/4
  100. math

    8 divided by 1/7