Irina

Most popular questions and responses by Irina
  1. chemistry

    How to prepare 0.2M of NaOH in 250ml volumetric flask???

    asked on January 15, 2015
  2. Physics

    A 11.3 weather rocket generates a thrust of 240 . The rocket, pointing upward, is clamped to thetop of a vertical spring. The bottom of the spring, whose springconstant is 570 , is anchored to the ground. Initially, before the engine is ignited, therocket

    asked on February 23, 2011
  3. math

    Mrs. Diaz wishes to save at least $1500 in 12 months. If she save $300 during the first 4 months, what is the least possible average amount that she must save in each of the remaining 8 months? After 4 months, 4 x 300 = $1200 will be saved. That leaves

    asked on January 9, 2007
  4. Chemitry

    Nitrogen dioxide, NO2, decomposes upon heating to form nitric oxide and oxygen according to the following equation: 2NO2(g)---->2NO(g) + O2(g) At the beginning of an experiment, the concentration of nitrogen dioxide in a reaction vessel was 0.1103 mol/L.

    asked on December 2, 2010
  5. pre-calculus

    A machine worth $10,000 new and having a scrap value of $1000 is to be depreciated linearly over an 18-year life. What will be the value of the machine after 9 years?

    asked on October 7, 2014
  6. accounting

    Specify which of the following cash transactions would have resulted in the $4,100 posting to the account. (You select more than one answer. Single click the box with a check mark for correct answers and double click to empty the box for the wrong

    asked on February 19, 2016
  7. pre-calculus

    It has been discovered in a certain state that the relationship between the number of snow shovels demanded varies linearly with its price. When the price per item was $ 38 ,2200 items were demanded; When the price was $ 49 , 2125 items were demanded.

    asked on October 3, 2014
  8. managment

    Toyota used to sit on top of the world. It basked in the reputation of building high-quality cars efficiently. It enjoyed unprecedented growth, even surpassing General Motors as the largest car manufacturer in the world. But all of that came tumbling down

    asked on September 27, 2011
  9. Math

    Given the following data set, x 0 1 2 3 4 5 6 y 0.06 0.156 0.4056 1.05456 2.741856 7.1288256 18.53494656 Determine by regression the best exponential function that fits the data Function =

    asked on March 24, 2015
  10. Math

    The quantity Q of radioactive carbon remaining in a 300 - gram wood sample at time t is given by the expression Q(t) = 300 e^{- 0.000324*t}. How much radioactive carbon remains in the sample after (a) 200 years, (b) 50000 years, (c) 125500 years?

    asked on March 19, 2015
  11. BUS 200

    You will represent a major tobacco company like R. L. Reynolds or Philip Morris. Research the issues and debate Should tobacco companies cease and desist all advertising in the US?

    asked on September 14, 2011
  12. Math

    The Hotel Regal has 600 rooms. Currently the hotel is filled . The daily rental is $ 250 per room. For every $ 4 increase in rent the demand for rooms decreases by 4 rooms. Let x = the number of $ 4 increases that can be made. What should x be so as to

    asked on September 22, 2014
  13. Math

    A rectangular field is to be subdivided in 6 equal fields. There is 1200 feet of fencing available. Find the dimensions of the field that maximizes the total area. (List the longer side first) Width = feet Length = feet What is the maximum area ? Area =

    asked on September 22, 2014
  14. Calculus

    Santr 109 (a fictitious substance) decays by about 6% every day. How much of a 84 pound sample remains after: (a) 7 days (b) 3 weeks (b) 48 days

    asked on March 24, 2015
  15. Pre-calculus

    You are given a pair of equations, one representing a supply curve and the other representing a demand curve, where p is the unit price for x items. 80 p + x - 380 = 0 and 84 p - x - 40 = 0 Identify which is the supply curve and demand curve and the

    asked on October 13, 2014
  16. Math

    A ball is thrown up at the edge of a 550 foot cliff. The ball is thrown up with an initial velocity of 87 feet per second. Its height measured in feet is given in terms of time t, measured in seconds by the equation h = -16 t^2 + 87 t + 550 a. How high

    asked on September 16, 2014
  17. social studies,managnent

    Group 1 will represent a major tobacco company like R. J. Reynolds or Philip Morris. . Topic that will be debated is: Should tobacco companies cease and desist all advertising in the United States? Each group should thoroughly research the issues, and come

    asked on September 26, 2011
  18. Culc please help

    Using the left endpoint with n = 3, approximate the area of the region bounded by f(x)=3x^2+3 and the x-axis for x between -4 and1

    asked on May 16, 2015
  19. managment

    Group 1 will represent a major tobacco company like R. J. Reynolds or Philip Morris. . Topic that will be debated is: Should tobacco companies cease and desist all advertising in the United States? Each group should thoroughly research the issues. You will

    asked on September 27, 2011
  20. social studies

    a. So with almost no impact on its sales and little concern amont its customers, should Wal-mart take on its critics and ight back, or shoul it focus on its business and let its results speak for themselves? b. What should Wal-mart do, if anything, in

    asked on September 14, 2011
  21. pre-calculus

    You are given a pair of equations, one representing a supply curve and the other representing a demand curve, where p is the unit price for x items. -45 x^2 - 74.5199999999995 x + 15921.36 - 1224.72 p = 0 and 54 x^2 + 1743.12 x + 13880.16 - 6940.08 p = 0

    asked on October 14, 2014
  22. pre-calculus

    It has been found that the supply of lamps varies linearly with its price. When the price per item was $ 94.67 ,64 items are supplied; When the price was $ 134.67 , 124 items are supplied. How many lamps are supplied when the price per item is $ 118.00 ?

    asked on October 14, 2014
  23. pre-calculus

    The Hotel Florence has 550 rooms. Currently the hotel is filled . The daily rental is $ 700 per room. For every $ 14 increase in rent the demand for rooms decreases by 7 rooms. Let x = the number of $ 14 increases that can be made. What should x be so as

    asked on October 13, 2014
  24. math

    t has been discovered in a certain state that the relationship between the number of snow shovels demanded varies linearly with its price. When the price per item was $ 38 ,2200 items were demanded; When the price was $ 49 , 2125 items were demanded.

    asked on October 13, 2014
  25. math

    You are given a pair of equations, one representing a supply curve and the other representing a demand curve, where p is the unit price for x items. 80 p + x - 380 = 0 and 84 p - x - 40 = 0 a. Identify which is the supply curve and demand curve and the

    asked on October 13, 2014
  26. Math

    The profit in dollars in producing x- items of some commodity is given by the equation P = - 37 x^2 + 1073 x - 7548 . How many items should be produced to break even? (If there are two break-even points, then enter the smaller value of x. Your solution may

    asked on September 16, 2014
  27. Math

    Wile E. Coyote catapults himself off of a 500 ft. cliff with an initial velocity of 20 ft/sec. His height t seconds after catapulting is given by the function h(t) = −16t2 + 20t + 500 . (Note the y-intercept of (0, 500). a. Find his maximum height (Hint:

    asked on September 12, 2014
  28. social studies,managnent

    Toyota used to sit on top of the world. It basked in the reputation of building high-quality cars efficiently. It enjoyed unprecedented growth, even surpassing General Motors as the largest car manufacturer in the world. But all of that came tumbling down

    asked on September 26, 2011
  29. Physics

    When a certain spring is stretched beyond its proportional limit, the restoring force satisfies the equation F=-kx+βx^3. If k=8.5 N/m and β=105 N/m^3, calculate the work done by this force when the spring is stretched 0.114 m. My attempt: F=

    asked on February 23, 2011
  30. STATISTICS

    Here is the problem: (A) Select a random sample of 30 student from our population (we have a data entry to get the sample from). At the 0.05 level of significance is there evidence that the average travel time is greater than 45 minutes? (B) What

    asked on December 16, 2007
  31. Math

    (a) Find the present value of $ 4600 per year flowing uniformly over a 10 -year period if it earns 5.3 % interest compounded continuously. (b) What is its final value?

    asked on May 10, 2015
  32. math

    If 50100 dollars is deposited in an account for 14 years at 5.35 percent compounded continuously , find the average value of the account during the 14 years period.

    asked on May 10, 2015
  33. Math

    Determine whether the given equation is a circle, a point, or a contradiction (no real graph). x^2 + y^2 - 2 x - 16 y + 52 = 0 . The equation is a . (Enter "circle", "point", or "contradiction" in the answer space without quotes.)

    asked on September 24, 2014
  34. Math

    Find the vertex of the parabola y = f(x)= x^2 + 8 x - 11 x coordinate = y coordinate = Graph this function and estimate the x intercepts to the nearest tenth. Give your answers in order. x intercept one = x intercept two =

    asked on September 22, 2014
  35. Math

    At a selling price of $ 54 , a lamp company breaks even on total sales of $ 3564 . If the company's overhead is $ 396 , find the marginal production cost per lamp and find the profit on sales of 145 lamps.

    asked on September 15, 2014
  36. algebra

    1. √(x + 6) = -8 x=? 2. 4√(2x - 3) < 12 solve the inequality 3. 4 ≥ √(6x - 12) - 8 solve the inequality 4. √(3x - 5) = x - 3 x=? 5. √(4 - x) ≥ √(3x + 4) solve the inequality 6. x + 3 = √(5x + 4) + 1 x=?

    asked on January 4, 2010
  37. social studies

    what gift from the 1970 christmas book gave new meaning to bathroom oasis

    asked on November 30, 2006
  1. science

    Answer is B

    posted on June 26, 2016
  2. Statistics

    8/sqrt(81)=8/9=0.89

    posted on October 27, 2015
  3. Indentifying Fallacies

    false cause

    posted on September 9, 2015
  4. Math

    Consider the following sum 1/4*5+1/5*6+1/6*7+ ...+1/18*19 If it were written in sigma notation as a= b= f(i)=

    posted on May 15, 2015
  5. chemistry

    delta E = w + q q=570 J V1 = 0.12 L V2 = 0.88 L delta V = 0.88 L - 0.12 L = 0.76 L w = -P x delta V w = -1.0 atm x 0.76 L = -0.76 L atm You need to convert L atm to J -0.76 L atm / 1 L atm x 101.3 J = -76.99 J delta E = -76.99 J + 570 J = 493 J Mastering

    posted on April 8, 2015
  6. Math

    i just did it Q(200) = 300 e^(-0.000324*200) = 281.176 But for b) and c) web work doesn't accept my answers Q(50000) = 300 e^(-0.000324*50000) = 0.000028 maybe i should multiply by something...

    posted on March 20, 2015
  7. pre-calculus

    thank you

    posted on October 14, 2014
  8. math

    thank you so much!!!

    posted on October 13, 2014
  9. pre-calculus

    thank you

    posted on October 4, 2014