Popular questions and responses by JJ
  1. MATH

    the numerator of a fraction is one-half the denominator! If the numerator is is increased by 2 and denominator is decreased by 2, the value of the fraction is 2/3. What is the numerator of the original fraction?

    asked on August 25, 2013
  2. Physics

    A 10-kg piece of aluminum (which has a specific heat of 900 J/kg×°C) is warmed so that its temperature increases by 5.0 C°. How much heat was transferred into it?

    asked on December 19, 2010
  3. precalc

    The point (3, -4) is on the terminal side of an angle(theta) . What is cos(theta)

    asked on February 16, 2016
  4. Statistic

    I’m having problems creating the flow chart, so I am unable to insert the numbers. This is what I have done this far, and I’m not sure if I’m accurate with the calculations. (1) A school cafeteria is operated by five persons performing the activities

    asked on October 6, 2012
  5. Calculus

    The length of a rectangle is increasing at a rate of 9 cm/s and its width is increasing at a rate of 7 cm/s. When the length is 15 cm and the width is 10 cm, how fast is the area of the rectangle increasing?

    asked on November 9, 2010
  6. math

    What is the value of 14 – a2 given a = –3?

    asked on September 12, 2017
  7. Language arts

    . This question asks about your work in your reading role. You may use your novel to help you answer the question. Think about the work you completed in your reading role. Determine the ideas that would be most worthy to share in a literary discussion

    asked on June 6, 2016
  8. Chemistry. Please help!!

    Calculate the final temperature when a 18.7 gram sample of ice at 0 degrees C is placed into a styrofoam cup containing 113 grams of water at 71.6 degrees C. Assume that there is no loss or gain of heat from the surroundings. Heat of fusion of ice = 333

    asked on March 2, 2012
  9. math

    Evaluate (5+5√3i)^7 using DeMoivre’s theorem. Write your answer in rectangular form. Show all your work.

    asked on May 19, 2020
  10. math

    The heights of the five starters of a college basketball team are 6'6, 6'7, 6'9, 6'11 and 7'. What it the mean height of these players , in inches?

    asked on August 25, 2013
  11. akgebra

    One pipe can fill a tank in 20 minutes, while another takes 30 minutes to fill the same tank. How long would it take the two pipes together to fill the tank?

    asked on April 24, 2013
  12. Business Math

    What are the proceeds of a note for $5,500 at a discount rate of 8%, for 30 months?

    asked on November 3, 2013
  13. chm

    Why are the atomic masses listed in the periodic table not whole numbers? Answer Scientists have yet to make the precise measurements. That would be too much of a coincidence. ??>>The atomic masses are average atomic masses. or >>Today's instruments are

    asked on February 23, 2013
  14. Business Math

    Find the amount of the principal on a loan at 6% interest for 274 days if the interest was $68.50, using the ordinary interest method. (Round to the nearest whole dollar amount)

    asked on November 3, 2013
  15. chemisty

    Find the volume of a starburst candy (220 cm cubed). The mass is 5.14 grams. Calculate it's density. How many starburst would it take to fill your locker (139,200 cm cubed)? Use dimensional analysis to solve this problem.

    asked on September 8, 2013
  16. chemistry

    calculate how many mL of 6M HCL are needed to prepare 100mL HCL solution with a concentration of ~1M?

    asked on October 10, 2011
  17. Algebra 2

    Complex numbers are written in the form a + bi. What does i represent? -1 0 1 sqrt-1 **my choice

    asked on November 30, 2016
  18. physics

    A particle of mass 7.7 × 10-8 kg and charge +11 μC is traveling due east. It enters perpendicularly a magnetic field whose magnitude is 4.2 T. After entering the field, the particle completes one-half of a circle and exits the field traveling due west.

    asked on October 12, 2014
  19. chemistry

    How many moles of chloroethylene contain 5.47×10^26 molecules?

    asked on April 22, 2011
  20. General

    Are their any search engines I can use besides bing and google? Any places I can access historical journals? Thanks!

    asked on March 29, 2011
  21. 10th grade

    BC=3x+2 and CD= 5x-10. Solve for x.

    asked on October 30, 2010
  22. Trigonometry

    How could you evaluate tan (13pi/12) if you did not know the sum and difference formula for tangent? Would you use the sin and cos sum and difference formulas, and if so, can someone walk me through it? Thank you!!!

    asked on April 3, 2020
  23. Math

    On which interval is log(5 – x) negative?

    asked on October 1, 2019
  24. Math

    which polynomial does the model represent (Model shows: 1 big black square, 2 long blank rectangles, 3 long rectangles, 3 small blank squares, 1 small blank square) a.) -x^3+2x^2-3x+2 b.)x^2+x-2 c.)-x^2-x+2 d.)-x^2+x-2

    asked on May 10, 2016
  25. Science test review

    Here are all the word you can use I need help chemical property mixture heat capasity homogeneous viscosity sublimitation physical property compound chemical formula substance density mass tempurature pressure heterogenerous 14. A property of matter

    asked on May 2, 2016
  26. Physics

    Two passenger trains are passing each other on adjacent tracks. Train A is moving east with a speed of 35.5 m/s, and train B is traveling west with a speed of 33.4 m/s. (a) What is the velocity (taking due east to be the positive direction) of train A as

    asked on September 11, 2015
  27. Statistics of Psychology

    Create a numerical and verbal hypothesis statement: People who are cyber bullied have, for the most part, been bullied in more traditional manners as well." Their research showed that the incidence increased over time, with 23 cases (56%) taking place

    asked on December 9, 2012
  28. math question

    How do you write 1/2 as a percent?

    asked on November 13, 2012
  29. Calculus. please helppp!!

    1) Two cars travel in the same direction along a straight road. The figure below shows the velocity, V, of each car at time t. Car B starts 3 hours after car A and car B reaches a maximum velocity of 40 km/hr. a. For approximately how long does each car

    asked on March 13, 2012
  30. physics

    You are trying to find out how high you have to pitch a water balloon in order for it to burst when it hits the ground. You discover that the balloon bursts when you have pitched it to a height of 14 m. With what velocity did the balloon hit the ground?

    asked on October 2, 2011
  31. Math

    Sheila's age is two years more than twice Nicole's age. The sum of their ages is the same as Steven's age. If Steven's age is ten years less than five times Nicole's age, ,find the age of each. Write a verbal model!

    asked on October 6, 2010
  32. Maths

    P varies partly as q and partly as the square of r. When p=6,q=8 r=4 and when p=10,q=12 and r=5. find the formula connecting p,q and r

    asked on February 8, 2020
  33. Math

    Find the digit that makes blank 2440 divisible by 9 test help im behind allot help.

    asked on October 11, 2017
  34. chemistry

    if 3.15g of mercury are thermally decomposed to mercury and oxygen what mass of mercury will be produced and how many oxygen molecules will be produced [hg=208,o=16]

    asked on December 30, 2016
  35. Social studies connexus 8th grade

    The Underground Railroad used escape routes that went throughout the South. Based on that fact, which of the following conclusions could be made? I could use some help here can anyone help me give me an answer or a link of some sort? Thanks

    asked on November 15, 2016
  36. Math

    determine whether the graphs of the following equations are parallel or perpendicular y=2/3x + 3, y=3/2x, 2x-3y=8

    asked on November 12, 2016
  37. language arts

    Joe magarac, Man of steel 8. In section 1, what does the author mean when he says joe magarac is a folk hero? A. Joe was a real man who spent his whole life in the steel mills of Pittsburgh. B. Joe was a mysterious figure who vanished without a trace.* C.

    asked on June 2, 2016
  38. History

    Which group creates the largest land empire in the 12th and 13th century? Chinese Mongols Muslims Russians I say, Muslims. Is this correct??

    asked on October 30, 2013
  39. math

    Jim has 1/3 as many goldfish as Hannah. Hannah has 5 times as many goldfish as Ping. If Ping has 15 goldfish, how many goldfish does Jim have?

    asked on August 26, 2013
  40. math

    In the xy-plane, lines a and b intersect at point (5,-2), and lines b and c intersect at point (-3,3). What is the slope of line b? Express your answer as a common fraction

    asked on August 25, 2013
  41. science

    a boat weights 10,000 newtons what is the magnitude of buoyant force acting on boat in the fliud

    asked on April 28, 2013
  42. algebra

    An object that is projected straight downward with initial velocity v feet per second travels a distance s vt 16t 2 =+ , where t =time in seconds. If Ramón is standing on a balcony 84 feet above the ground and throws a penny straight down with an initial

    asked on April 24, 2013
  43. chm

    Which of the following is a covalent compound composed of nonpolar covalent bonds? Answer >>H2 H2O CF4 CH4 NaF

    asked on February 26, 2013
  44. calculus

    1.) values of f(t) are given in the following table: t 0 2 4 6 8 10 f(t) 137 112 88 68 49 34 a. Does this function appear to have a positive or negative first derivative? Second derivative? * I think both derivatives are negative b. Estimate (f prime) f^'

    asked on February 22, 2012
  45. chem

    In an equilibrium mixture of HCl, Cl2 and H2, the partial pressure of H2 is 4.2 mPa and that of Cl2 is 8.3 mPa. What is the partial pressure of HCl at 500 oK given that at that temperature Kp = 4.0 x 1018 for H2(g)+ Cl2(g)--> 2HCl(g)

    asked on May 31, 2011
  46. cal

    Differentiate the function. f(x) = sin(7 ln x)

    asked on November 9, 2010
  47. PreCalc

    The decibel (dB) is defined as dB= 10log (P2/P1), where P2 is the power of a particular signal. P1 is the power of some reference signal. In the case of sounds, the reference signal is a sound level that is just barely audible.How many dBs does a sound

    asked on October 9, 2010
  48. Calculus

    A sign 3 feet high is placed on a wall with its base 2 feet above the eye level of a woman attempting to read it. How far from the wall should she stand to get the best view of the sign, that is, so that the angle subtended at the woman’s eye by the sign

    asked on July 11, 2010
  49. physics

    A chair of weight 150 lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of = 36.0 directed at an angle of 40.0 below the horizontal and the chair slides along the floor.Using Newton's laws, calculate , the

    asked on December 14, 2009
  50. essay

    I have to write an essay about one of the social problems during the Industrial Revolution according to the book call "Frankenstein". I don't know which topic should I choose that have enough evidence from the book to write a 7pgs essay. This will talk

    asked on December 10, 2006
  51. p.e.

    without this system in your body you would really get sick because toxins and wastes would build up. 1. cardiovascular 2. excretory 3. intugumentary **** 4. muscular

    asked on November 27, 2017
  52. physics

    Explain in a few words why, when operating a garden hose fitted with a trigger-operated nozzle, the water jet is momentarily more powerful at the instant the trigger is squeezed than later, when there is a continuous stream of water. Show that the amount

    asked on March 13, 2017
  53. Physics

    A girl tried to overthrow gender stereotypes by kicking her stuffed animal across a park with an initial velocity of 25m/s, making an angle of 45 degrees with the horizontal. Upon reaching maximum height, her cat jumped and propelled it further

    asked on October 17, 2016
  54. environmental science

    the warming of the oceans causing less carbon dioxide to be soluble in them, and at the same time leaving more carbon dioxide in the atmosphere causing an increased warming of the atmosphere, is a example of a a. model of a system showing a paradigm shift.

    asked on October 12, 2016
  55. 2nd grade math

    Show how to make one addend the next tens number. Complete the new addition sentence 26+27=? Is it 53 (10+43=53)

    asked on October 4, 2016
  56. career

    Matching these ones I really don't have a clue so if you could help here it would be nice but if not I understand Match the following terms with their definitions. A. using the connections among people to help one another reach important goals B. personal

    asked on May 17, 2016
  57. Math

    Write and simplify the polynomial represented by the model. (Model shows: 3 big blank squares, 2 long black rectangles, 3 small blank squares, 1 big black square, 6 small black squares) a. -2x^2 + 2x + 3 b. 2x^2 - 2x - 3 c. 3x^2 - 2x - 3 d. 2x^2 - 2x + 3

    asked on May 10, 2016
  58. Math

    find p so that the numbers 7p+2, 5p+12, 2p-1...... form an arithmetic sequence

    asked on January 29, 2016
  59. math

    If r = 7 m then d = what c = what

    asked on March 1, 2015
  60. MATH

    Suzanna needs a board that is at 3.5 meters long. is the board long enough Explain

    asked on December 14, 2014
  61. algebra

    Suppose y varies directly with x. Write an equation relating x and y. 645-09-05-00-00_files/i0130000.jpg a. y = 6x c. y = 7x b. y = x d. y = − x

    asked on November 6, 2014
  62. pyhsics

    A man drops a rock off the side of a cliff, and hears it hit the bottom 2.8 seconds later. If the average speed of sound is 335 m/s, how high is the cliff? I have been able to figure out this much, but I don't know how to solve the problem with the data

    asked on October 24, 2014
  63. Chemistry

    A piston is holding 125 mL of gases at a temperature of 300 K and a pressure of 2.39 atm. What is the volume of the gases if the temperature is increased to 500K and the pressure falls to 2.15 atm?

    asked on February 15, 2014
  64. Statistics

    A national opinion poll found that 44% of all American adults agree that parents should be given vouchers good for education at any public or private school of their choice. Suppose that in fact the population proportion who feel this way is p=0.44. A)

    asked on December 17, 2013
  65. History

    What are three heirs of ROme after the fall of the Western Empire? I think I know two, which are...Byzantine and Islamic. But what is the last one?? or is my two answer right??

    asked on October 29, 2013
  66. History

    When was the height of Egyptians, Athenians, Alexander's empire, and Roman Empire? I am having hard time finding the exact or round about year to these. I've found two so far, but I am sure if its right. please help so i can study for my test! thank you!

    asked on October 1, 2013
  67. quantum physics

    !@#$%^& 6 q6:Now, consider the case where N4 elements are marked instead of just one. If we run one iteration of Grover's algorithm and measure, what is the probability that we see a marked element? q7: Which of the following observables correspond to a

    asked on September 28, 2013
  68. Math

    A state creates license plates that each contain two letters followed by three digits. The first letter must be a vowel and duplicate letters and digits are allowed. How many different plates are possible?

    asked on August 20, 2013
  69. Chemistry

    A 1.065-g sample of an unknown substance is dissolved in 30.00 g of benzene; the freezing point of the solution is 4.25 degrees C. The compound is 50.69% C, 4.23% H, and 45.08% O by mass. Info you might need on benzene: Normal Freezing point,degrees C:

    asked on February 25, 2013
  70. chm

    How would you classify the following material?swimming pool water homogeneous mixture

    asked on February 23, 2013
  71. english

    can divining be replaced by doubting or realizing

    asked on February 14, 2013
  72. englsih

    we saw nelson (skating in the park) the parenthesis is it idependent clause gerund phrase or adverb clause or noun clause

    asked on February 13, 2013
  73. Math

    Marshal sleeps 8 hours each day how many hours does Marshal sleep in one week

    asked on February 12, 2013
  74. english

    how do u find a subject for writng instuctions for using a tool

    asked on February 12, 2013

    In the following sentence, which words should be in quotation marks? Did you read the chapter Chemical Reactions in our science textbook, Understanding Chemistry? A. chapter Chemical Reactions B. Chemical Reactions C. Understanding Chemistry I think the

    asked on February 1, 2013
  76. Chemistry

    An structural isomer of bromobutane (C4H9Br) can be hydrolysed using aqueous sodium hydroxide to produce butanol. This can be represented by the following equation: C4H9Br(l) + OH-(aq)  C4H9OH(l) + Br-(aq) This reaction was investigated experimentally

    asked on April 5, 2012
  77. Economics

    The index most widely used by the government and the private sector to measure changes in the cost of living is the (a) the GDP deflator, (b) Producer Price Index, (c) The interest rate, (d) Consumer Price Index

    asked on November 9, 2011
  78. problem solving

    The greatest common factor of two nubers is one. What do you know about the numbers.

    asked on October 19, 2011
  79. cal

    If a ball is thrown into the air with a velocity of 41 ft/s, its height (in feet) after t seconds is given by y = 41t − 16t^2. Find the velocity when t = 1.

    asked on October 18, 2011
  80. Maths

    Hi! I need help. I have worked out total rainfall, I have the monthly average (given by beauro) and I worked out the mean rainfall each month. My teacher says I need to work out the amount of rainfall in m-cubed that would fall on the roof each month. How

    asked on March 31, 2011
  81. Physical Science

    A 15 Kg object that is free falling has a total mechanical energy of 13,230 Joules. (A) From what height was the object dropped? (B) What is the velocity of the object when it hits the ground? (C) How long does the object fall?

    asked on January 8, 2011
  82. Physics

    A heat engine exhausts 3 000 J of heat while performing 1 500 J of useful work. What is the efficiency of the engine?

    asked on December 19, 2010
  83. Algebra

    Kevin has $6.45 in coins in his cash box. The numbers of quarters is one less than twice the number of dimes. The number of nickels is one less than twice the number of quarters. The value of the pennies is the same as the value of the nickels. How many of

    asked on December 14, 2010

    Indentify the direction of the netforce in each of the following situations. A marble moves in a circular path inside a paper plate at a constant speed. The moon orbits the earth. An air hockey puck moves smoothly across the air hockey table after being

    asked on November 19, 2010
  85. Please Algebra 1

    Roberta sold fifty tickets for the school play. Roberta sold ten more student tickets than adult tickets. How many student tickets did Roberta sell? From this result, if the total cost of a student ticket was three-fourths the cost of an adult ticket, and

    asked on October 17, 2010
  86. Physics

    a basketball player is trying to make a half-court ump shot and releases the ball at the height of the basket. assuming that the ball is launched at 51 degrees, 14 m from the basket, what speed must the player give the ball?

    asked on April 18, 2010
  87. Art history

    Can you tell me if these sculptures have open or closed contour? I can't post the link but if you search the name and the numbers it should show up. Sculpture 1: Mother and Child [1979.206.121] Sculpture 2: Virgin and Child [33.23]

    asked on February 3, 2010
  88. History

    How did human history in North America during the period described in the Prologue differ from the events of Asia, Eurasia,

    asked on November 6, 2009
  89. Geometry

    If rectangle ABCD has a larger area than rectangle EFGH, does it follow that ABCD must have a perimeter larger than that of EFGH? Why or why not.

    asked on October 20, 2009
  90. Geometry

    The length of a median of a triangle is 36 units. How many units from the vertex is the median?

    asked on October 7, 2009
  91. math

    find counterexample the quotient of two proper fractions is a proper fraction

    asked on August 18, 2009

    Referring to the diagram, if c = 32 and theta is equal to 57.6 degrees, find the difference in the length of sides a and b. Another words determine the length of side a, determine the length of side b, and then subtract b from a (a - b). (For example if a

    asked on August 26, 2011
  93. Calculus

    related rates: a ladder, 12 feet long, is leaning against a wall. if the foot of the ladder slides away from the wall along level ground,what is the rate of change of the top of the ladder with respect to the distance of the foot of the ladder from the

    asked on January 9, 2008
  94. French

    my teacher marked these phrases as wrong but i don't know what about them is wrong: 1. je revelerais sans prevenir 2. j'ai vendu mes robes plus jolies both of them need "un mot a ajouter"

    asked on October 10, 2007
  95. science

    What are two chemical and two physical properties of water? Please help me. Thank you. physical properties: boiling point, freezing point,density, color, electrical conductivity chemical properties: reactivity with sodium. Reactivity and decomposition with

    asked on June 10, 2007
  96. Physics

    for our lab, we had to fill a semi-circle plastic dish (with a scratch on one side) with water and find the index of refraction of water by putting a pin on one side of the dish, looking through the water, and put a pin on the other side of the dish to

    asked on April 27, 2007
  97. MATH

    What number is less than10^-8? a)0.000001 b)0.0000001 c)0.00000001 d0.0000000001 10^(-8) = 0.00000001 figure it out from there. hint: (c) = 10^-8

    asked on February 25, 2007
  98. geography

    what is phyiscal region? What is a physical region? A physical region is an area that shares a similar type of landform or physical characteristic. In South Asia, we find three physical regions: The Himalaya Mountains The Indo-Gangetic Plain The Deccan

    asked on November 26, 2006
  99. science

    how do jupiter's moons stay in orbit around jupiter They rotate around jupiter. If you rotate around an object you are accelerating toward it, even though the distance can stay the same. This so-called centripetal acceleration multiplied by the mass must

    asked on November 11, 2006
  100. Math

    If you receive $1000 for your birthday and decide to invest it in an account earning 8% compound interest, how much will you have in 5 years when you graduate high school? A. $400 B. $1400 C. $1469.32 D. $18,895.68 E. $1327.68

    asked on May 27, 2020


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