Popular questions and responses by Lee
  1. Trigonometry

    The populations, P, of six towns with time t in years are given by: I) P=1000(1.08)^t II) P= 600(1.12)^t III) P = 2500(0.9)^t IV) P=1200(1.185)^t V) P=800(0.78)^t VI) P=2000(0.99)^t a. Which towns are growing in size? Which are shrinking? b. Which town is

    asked on January 15, 2013
  2. I need help, I'm stuck...what is the correct answe

    The table below shows the scores of a group of students on a 10-point quiz. Test Score Frequency 3 0 4 2 5 2 6 1 7 2 8 3 9 0 10 4 The mean score on this test is: 6.5 The median score on this test is: 7.5

    asked on October 24, 2016
  3. chemistry

    Write the equation for the decomposition of water into its elements. Phase symbols are not graded.

    asked on April 17, 2013
  4. Cal 1

    The top and bottom margins of a poster are each 12 cm and the side margins are each 8 cm. If the area of printed material on the poster is fixed at 1536 cm^2, find the dimensions of the poster with the smallest area.

    asked on December 8, 2010
  5. algebra

    Could someone check my work; 1. Generate the first five terms in the sequence using the explicit formula. yn = –5n – 5 –30, –25, –20, –15, –10 30, 25, 20, 15, 10 –10, –15, –20, –25, –30(my answer) 10, 15, 20, 25, 30 2. What is the

    asked on February 3, 2013
  6. algebra

    Can someone check my answers please and if Im wrong please explain. 1) graph 4x^2+4y^2=64. what are the domain and range? domain;all real numbers range;-4

    asked on February 22, 2013
  7. algebra

    Can someone check my answers on exploring conic sections? 1. Graph x2 + y2 = 9. What are its lines of symmetry? Every line through the center is a line of symmetry. The y-axis and the x-axis are lines of symmetry.( my choice) Every line through the center

    asked on February 19, 2013
  8. chemistry

    Calculate the change in entropy that occurs in the system when 1.49 mol of acetone (C3H6O) condenses from a gas to a liquid at its normal boiling point (56.1 ∘C) The heat of vaporization is 29.1 kJ/mol.

    asked on February 21, 2020
  9. Bus math

    Bari Jay, a gown manufacturer, received an order for prom dresses from China. Her cost is $40 a gown. If her markup based on selling price is 76%, what is the selling price of each gown?

    asked on October 13, 2017
  10. statistics

    Consider a binomial experiment with 20 trials and probability 0.45 on a single trial. Use the normal distribution to find the probability of exactly 10 successes. Round your answer to the thousandths place.

    asked on August 2, 2011
  11. Calc

    A sample of a radioactive substance decayed to 93.5% of its original amount after a year. a) What is the half-life of the substance? ? years (b) How long would it take the sample to decay to 10% of its original amount? ? years

    asked on November 8, 2009
  12. Math and exopents

    Given w = 10. w + w (12 - 2*2 * 3) * 7? Can some one help? the answers are: 73 12 6 3 but none of my calculations are 73, 12, 6 or 3 :(

    asked on September 6, 2015
  13. chemistry

    Baking soda is sodium bicarbonate, NaHCO3, and vinegar is primarily acetic acid, HC2H3O2. When baking soda is added to vinegar, the resulting reaction produces a tremendous amount of gas, as shown in this video. Complete this equation for the reaction of

    asked on April 19, 2013
  14. Basic Word and Excel

    What would be a situation in which you could use an Excel chart to present your data? a.)determining what percentage of customer 101 buys product A, and what percentage of the same customer buys product B b)Compiling survey questions and answers from both

    asked on December 5, 2017
  15. english

    Has anyone read Kate Chopin is so could you check my answers? 1. When Mrs. Sommers leaves to go shopping, she forgets to take money. her daughter Mag’s size. her preferred store. to eat lunch.***** 2. The resolution of a story should build to the climax

    asked on November 18, 2012
  16. chemistry 21

    13. Pure copper may be produced by the reaction of copper(I) sulfide with oxygen gas as follows: Cu2S(s) + O2(g) „_ 2Cu(s) + SO2(g) If the reaction of 0.540 kg of copper(I) sulfide with excess oxygen produces 0.140 kg of copper metal, what is the percent

    asked on January 31, 2010
  17. economics

    Could someone check my work? Please When the government attempts to cover large deficits by creating more money, what is the probable result called? government borrowing hyperinflation (my choice) excess currency full employment 2. What is one of the major

    asked on November 6, 2012
  18. chemistry

    N2 (g) + 3H2 (g) → 2NH3(g) ΔH = -92.2 kJ How much heat (in kJ) is released if 13.3 g of hydrogen is consumed to make ammonia? (Give your answer as a positive number, since you cannot release negative energy.)

    asked on October 14, 2017
  19. algebra

    A few more question Id like for someone to check please. 1) what are the vertex, focus, and directrix of the parabola with the given equation? x^2-8x-28y-124=0 vertex (4,-5) focus (0,7) directrix y=-12 2) write an equation of a circle with given center and

    asked on February 22, 2013
  20. physics

    A wave of amplitude .30 m interferes with a second wave of amplitude .20 m. What are the largest and smallest displeacements that can occur? What type of interference is demonstrated by each displacement?

    asked on September 8, 2009
  21. algebra

    I have 3 questions I need help with. 1) what is the 15th term of the sequence 81,27,9,... 2) what is a possible value for the missing term of the geometric sequence 39,_,975,_ 3) what is the sum of the finite arithmetic series (-5)+0+5+10+..+65

    asked on February 12, 2013
  22. algebra

    asked on January 19, 2013
  23. math

    Assignment 1 Chapter 11. Data Analytics (p. 332) 38. Refer to the Baseball 2016 data, which report information on the 30 Major League Baseball teams for the 2016 season. A. At the .05 significance level, can we conclude that there is a difference in the

    asked on May 26, 2019
  24. Chemistry help

    A substance with pH of 3 is 10 times as Acidic as a substance with a pH of 4. *****or******* A substance with a pH 3 is twice as acidic as a substance with a pH of 4.

    asked on April 14, 2012
  25. ncu

    a health care professional wishes to estimate the birth weight of infants how large a sample must she select to be 90% confident that the true mean is within 6 ounces of e sample mean. the standard deviation of birth weights is is known to be 8 ounces

    asked on October 6, 2011
  26. Calculus

    What is the size of the smallest nonnegative angle coterminal with an angle of 1051π radians? I got 180, but it wasn't correct?

    asked on December 2, 2017
  27. Physics

    a rectangular box of negligible mass measures 5m long,1m wide and 0.5m high. How many kilograms of mass can be loaded into the box before it will sink in a freshwater lake?

    asked on January 6, 2015
  28. chemistry

    Balance the following redox reaction by inserting the appropriate coefficients. H^+ +CrO4^2- +NO 2^- =Cr^3+ +H2O+NO3^-

    asked on April 19, 2013
  29. algebra

    Robin bought a computer for $1,250. It will depreciate, or decrease in value, by 10% each year that she owns it. a) Is the sequence formed by the value at the beginning of each year arithmetic, geometric, or neither? Explain. b) Write an explicit formula

    asked on February 12, 2013
  30. calculus

    the equation of motion is given for a particle, where s is in meters and t is in seconds. find the acceleration after 2.5 seconds.

    asked on October 30, 2011
  31. Visual Basic 2008 Programming

    Help! I'm not sure how to start or how calculate. This is the project. Using For Next Loops. - When $1000 is deposited at 5 percent simple interest, the amount grows by $50 each year. When money is invented at 5 percent compound interest, then the amount

    asked on November 16, 2010
  32. Physics

    Why will the escape of neutrons be proportionally less in a large piece of fissionable material than in a smaller piece?

    asked on April 25, 2008
  33. basic word & excel

    6. _______ data updates in your destination document if there are changes to the source data. A. Linked B. Integrated C. Embedded D. Field

    asked on December 12, 2017
  34. Physics

    In the series circuit, if the current through R1 is 1.5 A, what is the current through R2? 1. Unable to determine 2. 1.5 A 3. 1 A 4. 0.5 A 5. 3 A

    asked on February 24, 2016
  35. chemistry

    ΔH°rxn is -114.14 kJ/mol. Calculate ΔH°f of gaseous nitrogen monoxide, given that ΔH°f of NO2(g) is 33.90 kJ/mol.

    asked on December 7, 2015
  36. Math

    25% of my candies are chocolate candiea i had 25 chocolate candies. How many candies did i have altogether?

    asked on November 17, 2015
  37. physics

    If an atom has an electron in the n = 5 state with ml = 3, what are the possible values of l?

    asked on November 24, 2014
  38. Math

    The hexagon below is made up of six equilateral triangles with sides of 6 centimeters each. The height of each triangle is 5.2 centimeters. What is the area of the hexagon

    asked on May 11, 2013
  39. chemistry

    Write the balanced chemical equation for the Habor-Bosch process, that is, the combination of nitrogen and hydrogen to form ammonia, NH3. Phase symbols are optional.

    asked on April 17, 2013
  40. algebra

    Simplify the rational expression state any restrictions on the variable t^2+2t-24 / t^2-36 I got t-4 / t-6, but Im not sure of the restrictions whether its 6 or -6,6

    asked on January 30, 2013
  41. algebra

    Can someone help with inverse relations and functions? is relation t a function? Is the inverse t a function? chart looks like: x 0 2 4 6 y -10 -1 4 8 If someone could please explain this problem

    asked on December 10, 2012
  42. algebra

    suppose the polynomial function below represents the power generated by a wind turbine where x represents the wind speed in meters per second and y represents the kilowatts generated interpret f(10) f(x)=0.08x^3+x^2+x+0.26

    asked on November 12, 2012
  43. economics

    can someone explain the relationship between consumer expectations and economic performance? Could use some help.

    asked on October 31, 2012
  44. Physics 121

    The pulley has an inner radius of 0.35m and an outer radius of 0.65m. It has a mass of 1.8kg. A string wrapped around the inner part of the pulley is fastened to the ceiling. A second string wrapped around the outer part of the pulley is fastened to a

    asked on May 5, 2012
  45. Physics

    A particle leaves the origin with a velocity of 7.2 m/s in the positive y direction and moves in the xy plane with a constant acceleration of (3.0 – 2.0 ˆi ˆj ) m/s2. At the instant the particle moves back across the x axis (y = 0), what is the value

    asked on September 29, 2008
  46. math

    A ball is thrown into the air with an upward velocity of 40 ft/s. Its height h in feet after t seconds is given by the function h = -16h 2 + 40t + 6. A. In how many seconds does the ball reach its maximum height? B. What is the ball's maximum height?

    asked on May 15, 2018
  47. Physics

    A person driving her car at 45km/h approaches an intersection just as the traffic light turns yellow. She knew that the yellow light lasts only 2s before turning red,and shi is 28m away from the near side of the intersection. Should she try to stop,or

    asked on September 17, 2016
  48. english composition ll

    Which of the following best illustrates a positive feedback loop?

    asked on April 6, 2016
  49. Geometry

    A red cross helicopter takes off and flies 75km at 20degree south of west. There it's drops off some relief supplies. It then flies 125 km at 10 degree west of north to pick up three medics. A. Make an accurate drawing of the two vectors decribed? B. draw

    asked on March 10, 2015
  50. Simultaneous equations

    3x-14y=O and x-4y+1=0

    asked on March 1, 2015
  51. math

    The range of f(x) = ax + b is the set of all real numbers given that a and b are real numbers. Which produces a counter example to her statement?

    asked on February 2, 2014
  52. algebra

    Skip designs tracks for amusement parks. For a new design the track will be ellipitical if the ellipse is placed on a large coordinate grid with its center at (0,0) the equation x^2/2500+y^2/8100=1 model the path of the park.The units are given in yards,

    asked on March 1, 2013
  53. algebra

    Need help with this one write an explicit formula for the sequence 1/2,3//7,1/3,5/19,3/14 then find q14 I don't know how to set this up can someone please show me how this one works

    asked on February 5, 2013
  54. algebra

    Generate the first five terms in the sequence using the explicit formula; Cn=12n-11 Please explain

    asked on February 5, 2013
  55. algebra

    what is the quotient in simpliest form state the restrictions on the variable z^2-4/z-3 divided z+2/z^2+z-12 i got z^2+2x-8 but am not sure of the restrictions maybe 3,-2

    asked on January 30, 2013
  56. algebra

    what is the simpliest form of the equation 3 sqrt 750 + 3 sqrt 2058 - 3 sqrt 48 possible answers 14 3sqrt6 17.5 3sqrt6 33 3sqrt6 10 3sqrt6

    asked on December 2, 2012
  57. Math

    What is the difference between 500 thousandths and 5 tenths. I thought you could drop extra zeros to the right of the decimal? .500 vs .5

    asked on November 15, 2012
  58. math

    I have 1 thousand, 12 tens, 2 hundreds, and 2 ones. What number am I?

    asked on November 8, 2012
  59. algebra

    Use the quadratic formula to solve the equation. -4x^2-3x+2=0 Can someone please explain

    asked on November 1, 2012
  60. physics

    A child has a temperature of 101◦F. If her total skin area is 13 m2, find the en- ergy loss per second due to radiation, assum- ing the emissivity is 1. The Stefan-Boltzmann constant is 5.6696 × 10−8 W/m2 · K4 . (As- sume the room temperature is

    asked on October 21, 2012
  61. college algebra

    Using Systems of Equations. Please help!!! I'm not sure what steps to do, to work this problem. #7) Five hundred tickets were sold for a school play, which generated $3560 in revenue. The prices of the tickets were $5 for children, $7 for students, and $10

    asked on November 22, 2010
  62. circles

    the radius of a curvature is 10ft and the height of the segment is 2ft. What is the length of the chord

    asked on September 26, 2009
  63. Geography

    Identify three perceptual factors that affect Egypt’s regionalization. These are the ways that people think and act about a region - they can be very powerful. Find a perceptual factor that connects Egypt to Africa, to Europe, and to Southwest Asia.

    asked on October 24, 2019
  64. math

    A theater has 22 seats in the first row, 25 seats in the second row, 28 seats in the third row, and so on. How many seats are in the Fifteenth row?

    asked on May 24, 2018
  65. basic word and excel

    _______ data would be useful for creating a weekly status report for your manager that should reflect changes in real time. A. Field B. Integrated C. Linked D. Embedded

    asked on December 13, 2017
  66. Math

    How do I write the equation for this: sum of ten and nineteen

    asked on June 25, 2016
  67. Chemistry

    The Ksp values of BaSO4 and SrSO4 are 1.1x10^-10 and 3.8x10^-7 respectively. Calculate the concentrations of Ba2+, Sr2+, and SO4 2- in a solution that is saturated with BaSO4 and SrSO4.

    asked on November 18, 2014
  68. chemistry

    If a solution containing 34.576 g of mercury(II) perchlorate is allowed to react completely with a solution containing 10.872 g of sodium sulfate, how many grams of solid precipitate will be formed?

    asked on April 19, 2013
  69. algebra

    Can anyone help explain how to work this problem out? One factor in flood safety along a levee is the area that will absorb water should the levee break. the coordinates that make up the boundry area are (0,0),(2.8,2.1)and(4.3,4.4) what is the area of the

    asked on April 2, 2013
  70. Unknow

    A man has a rectangular garden. One length of the garden lies along a patio wall. However the rest of the garden is enclosed by 32 feet of fencing. If the length of the garden is twice its width, what is the area of the garden.

    asked on March 27, 2013
  71. algebra

    a hyperbola has vertices (+-5,0) and one focus (6,0) what is the standard form equation of the hyperbola.

    asked on February 25, 2013
  72. algebra

    what is an equation of a parobola with the given vertex and focus? vertex(5,4) and focus(8,4) Can someone show me the steps to get the equation please?

    asked on February 21, 2013
  73. math

    A ball dropped 16 feet. The height of each bounce of the ball is 8 feet, 4 feet, 2 feet and so on. How high will the sixth bounce be show all of your work

    asked on February 12, 2013
  74. algebra

    Write a recursive formula for the sequence formula 15,26,48,92,180,.. then find the next term. can someone please help me

    asked on February 5, 2013
  75. algabre

    the speed of the current in a river is 6 mph a ferry operator who works that part of the river is looking to buy a new boat for his business everyday his route takes him 22.5 miles against the current and back to his deck and he needs this trip in a total

    asked on January 24, 2013
  76. algebra

    Really need help with one problem. The table shows the annual consumption of cheese per person in the United States for selected years in the 19th century. What cubic model best fits this data? Year Pounds Consumption 1915 4.156 1922 4.857 1946 7.16 1991

    asked on November 28, 2012
  77. books

    Reread the nightmare scene near the end of The Night Thoreau Spent in Jail and describe the main characters and primary events in Henry’s nightmare. Also, discuss this scene in particular, and the play in general, as a work of protest against war itself.

    asked on November 12, 2012
  78. algebra

    Rewrit the equation in vertex form. Name the vertex and y-intercept. y=3/5^2+30x+382 I need some help do not understand these type of problems.

    asked on October 31, 2012
  79. algebra

    what is the equation in standard form of a parabola that contain the following points? (-2,-20),(0,-4),(4,-20) Please Help

    asked on October 29, 2012
  80. algebra

    A biologist took a count of the number of migrating waterfowl at a particular lake, and recounted the lakes population of waterfowl on each of the next six weeks. Find the function that models the data as a function of x, the number of weekx. Use the model

    asked on October 25, 2012
  81. Chem

    What mass of lithium (in g) is required to react completely with 58.3 mL of N2 gas at STP?

    asked on October 23, 2012
  82. phy101

    Calculate the velocity needed for an object starting at the Earth's surface to just barely reach a satellite in a geosynchronous orbit. Ignore air drag and assume the object has a speed of zero when it reaches the satellite. (The orbital radius of a

    asked on September 26, 2012
  83. Thank You MathMate

    Thank you for assisting me with my MATLAB question. If I posted this on the actual question you never would of seen it. What you suggested to do worked and produced the results I was suppose to get. I wanted to say thank you. And a grid_size of 500 seems

    asked on July 19, 2011
  84. MATH!

    The sum of two prime numbers is the prime number 89,563. Find the smaller of the two addends. I attempted the problem but I'm not sure if it is right. 89,561 is a prime number and so is 2. So is the answer 2?

    asked on May 6, 2011
  85. math

    A jet takes the same time to travel 2500km with the wind as it does to travel 1900 km against the wind. If its speed relative to the air is 450km/hr, what is the speed of the wind?

    asked on September 24, 2010
  86. Chemistry

    Which of the following gases is the best choice for inflating a balloon that must remain inflated for a long period of time? a) argon b) hydrogen c) neon d) oxygen

    asked on April 13, 2010
  87. Math

    Amy paid 72.34 for a pair of running shoes during a 20%off sale. what was the regular price?

    asked on January 31, 2010
  88. Math

    How many vertices does a cube have? How do you know for sure?

    asked on June 13, 2009
  89. Physics

    If U-238 splits into two even pieces, and each piece emits an alpha particle, what elements are produced?

    asked on April 25, 2008
  90. physics

    two straight parallel conductors carry current 200mA and 1A in opposite direction wires are 20 cm apart the distance of neutral point from 1A

    asked on June 2, 2020
  91. Chemistry

    Carbon dioxide (CO2) is a gas at room temperature and pressure. However, carbon dioxide can be put under pressure to become a "supercritical fluid" that is a much safer dry-cleaning agent than tetrachloroethylene. At a certain pressure, the density of

    asked on February 27, 2020
  92. Math

    In order for a pet to lose weight in a healthy manner, a veterinarian suggested an overweight large-breed dog lost 2 pounds per week. If the expression x-2y represents this situation what must be true about the value of y?

    asked on August 29, 2018
  93. history

    What led to the development of one-crop economies? A. Joint-stock companies found profitability in monopolizing one cash crop. B. One-crop economies were developed through slash-and-burn agricultural practices. C. Colonies sought to reduce costs by

    asked on July 27, 2018
  94. English

    Which of the following sentences demonstrates the correct use of capitalizing direction words? A. Are you heading East? B. Poor Alex thought he was driving West. C. The Northeast has been hit with an unusually cold winter. D. I live just South of Scranton.

    asked on October 2, 2017
  95. Physics

    On takeoff, the combined action of the engines and the wings of an airplane exert a force of 8.00 x 103 N on the plane upward at an angle of 65.0˚ above the horizontal. The plane rises with constant velocity in the vertical direction while continuing to

    asked on May 12, 2017
  96. Geography

    Why might a Confucian praise or criticize China’s current political system and its approach to economic and political change?

    asked on April 11, 2017
  97. Physics

    Three vessels have different shapes, but the area of their bottom surface is the same, and all three are filled with water with the same depth (1.|_| 2.\_/ 3./_\ ). Rank the magnitudes of the net forces exerted by the water on the bottom surface.

    asked on January 22, 2017
  98. Frequency-Math

    The table below shows the scores of a group of students on a 10-point quiz. Test Score Frequency 3 0 4 2 5 2 6 1 7 2 8 3 9 0 10 4 The mean score on this test is: The median score on this test is

    asked on October 23, 2016
  99. Math

    How do I write the equation for this: sum of ten and nineteen

    asked on June 25, 2016
  100. Algebra

    How do I solve this? A plane flying the 3458-mi from New York City to London has a 50-MPH tailwind. The flight's point of no return is the point at which the flight time required to return to New York is the same as the time required to continue to London.

    asked on May 9, 2016


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