Most popular questions and responses by janice
  1. Algebra

    Under ideal conditions, a population of e. coli bacteria can double every 20 minutes. This behavior can be modeled by the exponential function: N(t)=N(lower case 0)(2^0.05t) If the initial number of e. coli bacteria is 5, how many bacteria will be present

    asked on July 5, 2015
  2. Algebra

    Farmer Ed has 9,000 meters of​ fencing, and wants to enclose a rectangular plot that borders on a river. If Farmer Ed does not fence the side along the​ river, what is the largest area that can be​ enclosed?

    asked on June 24, 2015
  3. Probability

    A salesperson contacts eight potential customers per day. From past experience, we know that the probability of a potentail customer making a purchase is 0.10. a) What is the probability the salesperson will make at least two sales in a day? -Do you use

    asked on November 23, 2006
  4. Algebra

    The CarryItAll​ mini-van, a popular vehicle among soccer​ moms, obeys the demand equation ppequals=negative StartFraction 1 Over 40 EndFraction x plus 19 comma 000−140x+19,000. The cost of producing xx vans is given by the function Upper C left

    asked on June 22, 2015
  5. Probability

    A department store has determined that 25% of all their sales are credit sales. A random sample of 75 sales is selected and the proportion of credit sales in the sample is computed. a) What is the probability that the same proportion will be greater than

    asked on November 23, 2006
  6. Algebra

    A golf ball is struck by a​ 60-degree golf club at an initial velocity of 84 feet per second. The height of the golf ball in feet is given by the quadratic function h(x)= 16 x^2/(42)^2+72.7/42x where x is the horizontal distance of the golf ball from the

    asked on June 25, 2015
  7. math

    How many 50 centimeter pieces of ribbon can Casey cut from a roll of 60 meters long?

    asked on March 18, 2015
  8. health

    Which of the following is true in regard to limited data sets? A.Patients must authorize the use of limited data sets. B. Those who receive limited data sets can pass them on witout restrictions. C. Limited data sets cant include a patiemts city, state,

    asked on August 30, 2010
  9. Algebra

    what is the interest rate necessary for an investment to quadruple after 5 years of continuous compound interest? I keep getting r=11%

    asked on July 10, 2015
  10. Algebra

    A club currently has 300 members who pay $ 400 per month for membership dues. The​ club's board members want to increase monthly revenue by lowering the monthly dues in hopes of attracting new members. A market research study has shown that for each $ 1

    asked on June 24, 2015
  11. Physics

    A plane intends to north with a speed of 250 m/s relative to the ground through a high altitude cross wind of 50 m/s coming from the east. Determine the bearing that the plane should take( relative to due north), A) the planes speed with respect to the air

    asked on June 19, 2017
  12. trig

    A plane is flying with an airspeed of 150 miles per hour and heading 155°. The wind currents are running at 25 miles per hour at 160° clockwise from due north. Use vectors to find the true course and ground speed of the plane.

    asked on November 16, 2012
  13. Science

    What is the length of an aluminum rod at 65 C if its length at 15 C is 1.2 meters? I will be happy to critique your thinking. New length= oldlength(1+alpha*(65-15)) where alpha is the coefficent of linear expansion of aluminum 1.201386 meters

    asked on July 31, 2005
  14. algebra

    A rancher has 4 comma 7004,700 feet of fencing available to enclose a rectangular area bordering a river. He wants to separate his cows and horses by dividing the enclosure into two equal areas. If no fencing is required along the​ river, find the length

    asked on June 22, 2015
  15. trig

    A ship is headed due north at a constant 20 miles per hour. Because of the ocean current, the true course of the ship is 15°. If the currents are a constant 18 miles per hour, in what direction are the currents running? (Enter your answers as a

    asked on November 16, 2012
  16. Probability 2

    Between 11 P.M. and midnight on Thursday night, Mystery Pizza gets an average of 4.2 telephone orders per hour. Find the probability that, a. at least 30 minutes will elapse before the next telephone order b. less than 15 minutes will elapse c. between 15

    asked on November 2, 2009
  17. Algebra

    The price p and the quantity x sold of a small​ flat-screen television set obeys the demand equation below. ​a) How much should be charged for the television set if there are 80 television sets in​ stock? ​b) What quantity x will maximize​

    asked on June 25, 2015
  18. Social Studies

    Please check my answers :) 1.Which statement about ethnic groups in Southwest Asia is accurate? A. Arabs are the majority in every country in the region. B. Arabs are the largest ethnic group in the region.**** C. Kurds make up the largest ethnic group on

    asked on April 1, 2019
  19. Math

    Determine the solution set of the system. x^2+y^2=9 x+y=3 Very confused on this one! PLease Help!

    asked on August 19, 2011
  20. 3rd grade math

    Write fact families for the numbers in 30 and 31.how are the fact families different

    asked on January 10, 2017
  21. trig

    A plane has an airspeed of 190 miles per hour and a heading of 24.0°. The ground speed of the plane is 214 miles per hour, and its true course is in the direction of 40.0°. Find the speed and direction of the air currents, assuming they are constants.

    asked on November 16, 2012
  22. math

    If 3 different digits represent 3 different letters and each time a letter appears it represents the same digit how do i find the sum of the 3 digits represented? p is not zero. pm pm pm +pm ____ ap

    asked on January 20, 2010
  23. trig

    A 52-foot wire running from the top of a tent pole to the ground makes an angle of 57° with the ground. If the length of the tent pole is 44 feet, how far is it from the bottom of the tent pole to the point where the wire is fastened to the ground? (The

    asked on November 16, 2012
  24. physics

    a) In raising a 4800 N piano with a pulley system, the workers note that for every 2 m of rope pulled down, the piano rises 0.3 m. Ideally, how much force is required to lift the piano? (b) If the workers actually pull with 2500 N of force to lift the

    asked on February 8, 2007
  25. Math

    Farmer Brown planted corn and wheat on his 1200 acres of land. The cost of planting and harvesting corn is $275.00 per acre. The cost of planting and harvesting wheat is $125.00 per acre. If Farmer Brown's total cost was $244,500, how many acres of corn

    asked on July 19, 2015
  26. Engineering/Chemistry

    Milk is flowing through a heat exchanger at a rate of 2000kg/h. he heat exchanger supplies 111,600kJ/h. The outlet temperature of the product is 95C. Determine the inlet temperature of the milk. The product specific heat is 3.9kJ/(kg*C)

    asked on January 31, 2012
  27. Math

    Point $G$ is the midpoint of median $\overline{XM}$ of $\triangle XYZ$. Point $H$ is the midpoint of $\overline{XY}$, and point $T$ is the intersection of $\overline{HM}$ and $\overline{YG}$. Find the area of $\triangle MTG$ if $[XYZ] =150$.

    asked on April 21, 2016
  28. Algebra

    Jim wants to build a rectangular parking lot along a busy street but only has 1,900 feet of fencing available. If no fencing is required along the​ street, find the maximum area of the parking lot.

    asked on June 24, 2015
  29. Quantitative Statistic

    The following information is available.   H0 : μ ≥ 220   H1 : μ < 220   A sample of 64 observations is selected from a normal population. The sample mean is 215, and the population standard deviation is 15. Conduct the following test of hypothesis

    asked on April 12, 2017
  30. algebra

    You randomly choose one of the tiles and flip the coin. Find the probability of the compound event. Write your answer as a fraction or percent rounded to the nearest tenth.

    asked on May 2, 2019
  31. Chemistry 12

    When 1.00 g. of MgCO3 is added to 2.0 L of water, some, but not all, will dissolve to form a saturated solution. Calculate the mass of solid that remains undissolved.

    asked on April 4, 2013
  32. chemistry

    Predict the sign of Delta S in the system for each of the following reactions. 2H3O^+(aq) + CO3^2-(aq) ---> CO2(g) + 3H2O(l) -,+, or 0?

    asked on March 3, 2010
  33. algebra

    Farmer Ed has 9 comma 0009,000 meters of​ fencing, and wants to enclose a rectangular plot that borders on a river. If Farmer Ed does not fence the side along the​ river, what is the largest area that can be​ enclosed?

    asked on June 22, 2015
  34. Molarity

    Find the molarity of a salt water solution containing 0.27 mol NaCl in 150g of H2O. My work: 0.27 mol NaCl/150 g x 1000g/1kg = 1.8 M is this correct, i wasn't really sure what to do...

    asked on November 12, 2009

    4NH3 + 7O2 = 4NO2 + 6H2O HHOW MANY MOLES OF AMMONIA WILL BE REQUIRED TO PRODUCE 10.0 MOLES OF WATER? The equation tells you 4 mols NH3 will produce 6 mols H2O. Can you set up a proportion to make that work? For example, 2 mols NH3 would produce 3 mols H2O

    asked on July 17, 2007
  36. statistics

    Miller (2008) examined the energy drink consumption of college undergraduates and found that males use energy drinks significantly more often than females. To further investigate this phenomenon, suppose a researcher selects a random sample of n=36 male

    asked on July 10, 2013
  37. Chemistry

    Suppose you are assigned to prepare a buffer of 0.10M HNO2 (Ka=1.7 x 10^-4) and 0.10M NaNO2 by mixing equal volumes of both solutions. What is the pH of the resultant solution? How would I first start this question? I have no clue what the steps are to be

    asked on April 15, 2015
  38. Chemistry

    NaHCO3 + HCl -> NaCl+H2O+CO2 What is the normality of a sodium bi carbonate solution containing 5.08g NaHCO3 in 150 ml solution?

    asked on November 12, 2009
  39. ps316

    There 112 seats there 7 seats in each row and 70 people are seated how many rows are empty

    asked on November 30, 2014
  40. statistics

    If 86% of households have cable television and three households are picked at random, what is the probability that at least one of those three picked will have cable television?

    asked on September 25, 2011
  41. Chemistry

    Since gases can be highly compressed, what must be true of the spaces between the molecules of the gas?

    asked on February 23, 2008
  42. AP Chemistry

    The normal boiling points of CO and SO2 are -192 degrees C and -10 degrees C, respectively A) At 25 degrees C and 1 atm, which gas would you expect to have a molar volume closest to the ideal value? B) If you reduce the deviation from ideal gas behavior,

    asked on January 4, 2007
  43. health

    Which one of the following factors would be considered de-identified information' A. Patients name-Joe Black B.Patients policy number-12345678912 C. Social Security Number-555-121-2222 D. Patient condition-patient is improving

    asked on August 30, 2010
  44. algebra

    Write a formula to express the following sentence as an equation: The sale price us 25% off the original price. Use S for sale price and P for original price to express S as a function of P.

    asked on August 31, 2014
  45. Physics


    asked on June 17, 2011
  46. Probability

    Daily output of Marathon's Garyville, Lousiana, refinery is normally distributed with a mean of 232,000 barrels of crude oil per day with a standard deviation of 7,000 barrels. Find the probability of producing.. a. at least 232,000 barrels b. between

    asked on November 2, 2009
  47. Math

    I have 6 hundred,4 tens, 5 ones and 7 tenths. What number am i

    asked on August 22, 2017
  48. algebra

    A club currently has 300300 members who pay $ 400$400 per month for membership dues. The​ club's board members want to increase monthly revenue by lowering the monthly dues in hopes of attracting new members. A market research study has shown that for

    asked on June 22, 2015
  49. chemistry

    In reverse osmosis, water flows out of a salt solution until the osmotic pressure of the solution equals the applied pressure. If a pressure of 47.0 bar is applied to seawater, what will be the final concentration of the seawater at 20 °C when reverse

    asked on February 19, 2012
  50. psychology

    In general, the approach to stress embraced by psychoneuroimmunologists focuses on

    asked on December 14, 2014
  51. trig

    Find all solutions to the following triangle. (Round your answers for angles A, B, A', and B' to the nearest minute. Round your answers for sides a and a' to the nearest whole number. If either triangle is not possible, enter NONE in each corresponding

    asked on November 16, 2012
  52. algebra

    solve the system of equations 2r+2s = 50 and 2r-s=17

    asked on January 20, 2011
  53. math problem solving

    the digit 5 occurs two times in the population of fairbanks. what is the value of each 5? explain your answer fairbanks- 35,252

    asked on August 28, 2014
  54. UMD

    A solution of H2SO4(aq) with a molal concentration of 3.22 m has a density of 1.183 g/mL. What is the molar concentration of this solution?

    asked on September 30, 2012
  55. physics

    In the Atwood machine shown in Figure 5.14a, m1 = 2.00 kg and m2 = 8.00 kg. The masses of the pulley and string are negligible by comparison. The pulley turns without friction and the string does not stretch. The lighter object is released with a sharp

    asked on October 21, 2015
  56. english

    what is correct barb-and i or barb and me

    asked on August 17, 2011
  57. accounting

    The stockholders' equity accounts of Lawrence Company have the following balances on December 31, 2010. Common stock, $10 par, 274,000 shares issued and outstanding $2,740,000 Paid-in capital in excess of par 1,200,000 Retained earnings 5,600,000 Shares of

    asked on September 10, 2010
  58. Business

    I want to buy a car with cash in 4 years. I have $10,000.00 that I can invest today. I can get a bond earning 4%. How much will I have for the purchase? This is what I am thinking for an answer but not quite sure: N=4 years I=4% PV=10,000 for a total of

    asked on July 7, 2015
  59. algebra

    Jim wants to build a rectangular parking lot along a busy street but only has 1 comma 9001,900 feet of fencing available. If no fencing is required along the​ street, find the maximum area of the parking lot.

    asked on June 22, 2015
  60. Calculus 2

    ∫ tan^2 (x) sec^4 (x) dx ∫ [tan^2 (t) + tan^4 (t)] dt ∫ [1-tan^2 (x)] / [sec^2 (x)] dx Trigonometric integral Please show steps so I can understand!

    asked on March 14, 2015
  61. Physics

    A jet plane lands with a velocity of 100 m/s and can accelerate at a maximum rate of -5.0 m/s2 as it come to rest. Can this plane land at an airport where the runway is 0.80 km long?

    asked on August 26, 2012
  62. math

    Suppose that 25% of all wise people are nice and half of all the nice people are wise. Suppose further that 25% of all the people are neither wise nor nice. What percent of all the people are both wise and nice?

    asked on March 16, 2011
  63. Algebra

    Form a third degree polynomial function with real coefficients such that 2+i and -5 are zeros. f(x)= ?

    asked on June 29, 2015
  64. Physics

    How will mechanical energy affect different points of oscillation on a vertical spring? Well i know that mechanical energy is PE and KE...So when the spring is compressed the mechanical energy will equal the PE and when extended or stretched it will equal

    asked on June 23, 2011
  65. Chemistry-confused

    All alkalis produce hydroxide ions when dissolved in water. How do we write the chemical equation for aqueous ammonia? I see some textbooks write it as ammonia gas dissolving in water to form ammonium ions and hydroxide ions. NH3(g)+ H2O(l) ==> NH4+(aq) +

    asked on April 10, 2009
  66. algebra

    tell whether x and y show direct variation and explain reasoning

    asked on September 24, 2017
  67. Physics

    if a car is moving around a circular track at a constant speed of 55 mi/h, is there a net force acting on the car?

    asked on October 25, 2010
  68. Statistics

    A recent article in a computer magazine suggested that the mean time to fully learn a new software program is 40 hours. A sample of 100 first-time users of a new statistics program revealed the mean time to learn it was 39 hours with the standard deviation

    asked on February 10, 2010
  69. Chem

    A gas has density of 1.977 g/dm3 at STP (a) what is its molecular mass? (b) what is its density at 77¢XC and 0.95 atm pressure? (c)If the gas is an oxide and has the formula XO2, what is the atomic mass of X

    asked on November 15, 2015
  70. trig

    Find all solutions to the following triangle. (Round your answers for angles A, C, A', and C' to the nearest whole number. Round your answers for sides c and c' to two decimal places. If either triangle is not possible, enter NONE in each corresponding

    asked on November 16, 2012
  71. chemistry

    consider the reaction between copper metal and chlorine gas producing solid copper(1) chloride. when 16.2g of copper is reacted in an excess of chlorine, how many grams of copper(1) chloride will be produced

    asked on April 28, 2012
  72. Math

    A juice concentrate containing 65% solids is added to a single-strength juice solution(containing 15% solid), in order to generate a final product which contains 45% solids. Calculate the amounts required for the concentrate and for the single strength

    asked on February 7, 2012
  73. physics

    A weight lifter lits a 1250 pound barbell 2 meters in 3 seconds. How much power was used to lift the barbell

    asked on November 4, 2010
  74. Science

    A sliver bar 0.125 meter long is subjected to a temperature change from 200C to 100C.What will the length of the bar after the temperature change? See the aluminum question. I will be happy to critique your work and thinking. A silver bar 0.125 meter long

    asked on July 31, 2005
  75. Quantitative Statistic

    Pennsylvania Refining Company is studying the relationship between the pump price of gasoline and the number of gallons sold. For a sample of 20 stations last Tuesday, the correlation was .78.   At the .01 significance level, is the correlation in the

    asked on April 18, 2017
  76. physics

    Consider the line passing through the center of the cue ball as the x axis. At the point of collision with the solid ball on the table, a line passing through the centers of the cue ball and the solid ball form a 45° angle with the X axis. Assume no

    asked on February 13, 2016
  77. Math

    I posted this under business the first time and got no answer so since its more mathematical here it is again: I can only put away $1,000 a year toward retirement. I am 22 and plan on retiring at 65 and earning 6%. How much will I have at retirement? Not

    asked on August 18, 2015
  78. trig

    Find all solutions to the following triangle. (Round your answers for angles A, C, A', and C' to the nearest minute. Round your answers for sides a and a' to two decimal places. If either triangle is not possible, enter NONE in each corresponding answer

    asked on November 16, 2012
  79. trig

    Find all solutions to the following triangle. (Round your answers to one decimal place. If either triangle is not possible, enter NONE in each corresponding answer blank.) A = 115.2¡ã, a = 43.6 cm, b = 23.1 cm First triangle (assume B ¡Ü 90¡ã): B =

    asked on November 16, 2012
  80. Math

    I have a problem. A theater runs 2 movies The first movie is 40 minutes long, the second is 60 minutes long. They start at 3:00. At what time will they start at the same time again? I know the answer is 5:00. I know it robably has something to do with 120

    asked on September 20, 2009
  81. french

    Passe compose: (Please forgive my accent marks) i know the past participle agrees with the subject, my text only have example for aller...je suis alle(e)...tu es alle(e)...nous sommes alle(e)s. But i am not sure for other verbs like descendre and partir...

    asked on April 2, 2008
  82. algebra

    if a+b=1 and a squared + b squared=2 what does a to the 3rd + b to the 3rd equal? If b is 1, b cubed is one. That would work for the first half, but doesn't extend to a to the 3rd+b to the 3rd and what weould 2 squard be? Thank you so much for helping Are

    asked on May 13, 2007

    You need to rent a moving truck for two days. Rider Moving Trucks charges $50 per day and $.50 per mile. UMove Trucks charges $45 per day and $0.75 per mile. Write an equation describing each situation. Graph them on the same xy axis. You only need

    asked on March 20, 2017
  84. Math

    Jasmine invested $73,000 in a fixed rate account offering 7.2% interest rate compounded semiannually. How long will it take her to grow it to $100,000? 100,000=(73,000)(0.072)^2)t

    asked on April 9, 2016
  85. trig

    A barge is pulled by two tugboats. The first tugboat is traveling at a speed of 16 knots with heading 135°, and the second tugboat is traveling at a speed of 15 knots with heading 195°. Find the resulting speed and direction of the barge. (Round your

    asked on November 16, 2012
  86. english

    please write a paragraph to show you comprehend what analogies and idoms are. use at least one analogy and one idom in the paragraph

    asked on July 19, 2012
  87. Physical Geography

    38 degrees celcius is what degree F?

    asked on February 13, 2012
  88. Physics

    What would the gravitation PE and Elastic PE be like on the moon?

    asked on June 24, 2011
  89. Physics

    So I did in an experiment and the results I got were the potential energy when the spring compresses is 0 and when it stretches is 1.42. This spring is vertical and has a 250 gram weight attached to it. I was very confused when i got these results because

    asked on June 23, 2011
  90. Physic

    These three are connected to 240V main supply : Grill = 6A Desk lamp = 0.6A Convector heater = 4.5 a(ii) which of these has the greatest resistance ? Explain how you can tell. (ii) calculate the resistance of the grill (iii) calculate the power rating of

    asked on June 4, 2011
  91. Chemistry - help needed

    In titrations involving sodium thiosulphate and potassium iodide, is it necessary to use starch solution to help us see the end point? If the colour change from yellow to colourless is easily visible, is it acceptable not to use the starch solution?

    asked on February 22, 2011
  92. math 6 grade

    If 2 people have 60 shares of stock between them and you double the number of shares of the 1st person and half the number of shares of the 2nd person so that they both have equal shares. How do find the number of shares the 1st person has?

    asked on December 3, 2009
  93. Chemistry

    We say that most bases are metal oxides and hydroxides, so an example of a base that is not ana oxide or hydroxide would be aqueous ammonia NH3(aq)?

    asked on April 10, 2009
  94. College Econ

    The gross national debt initially is equal to $2.5 trillion and the federal government then runs a defict of $100 billion: 1. What is the new level of gross national debt? 2. If 100 percent of this deficit is financed by the sales of securities to the

    asked on February 16, 2009
  95. Chemistry-help needed

    Concentrated sulphuric acid and manganese(IV) oxide were added to the solid. On warming a gas was evolved which turned litmus colourless. The answer is that Cl2 gas was evolved and chloride ion is present. Can you please explain the reaction that took

    asked on February 2, 2009
  96. Chemistry

    how many psi are in an atm? 14.7 lbs/in2 = 1 atm. An easy way to have your conversions checked is to go to www.google.com and type in, for example, 1 atmosphere to pounds per square inch and hit the go button.

    asked on July 17, 2007
  97. Calculus

    For what values of p>0 does the series Riemann Sum [n=1 to infinity] 1/ [n(ln n) (ln(ln n))^p] converge and for what values does it diverge? You need to let the summation start at n = 3 to avoid the singularity at n = 1 (although you can formally take

    asked on November 13, 2006
  98. Business

    I want to buy a house in 5 years. I need to have a down payment of $50,000. How much do I need to have today in order to have the down payment, if I can earn 5%? not sure how to go about this problem

    asked on July 8, 2015
  99. Finite Math

Four cards are drawn without replacement from a well shuffled standard deck of cards. Let X be the number of aces drawn. 12. What are the possible values of the random variable X? Write them in increasing order as a set using roster (or list) notation.

    asked on December 14, 2013
  100. statistics

    Playing game of chance and pay 300 by rolling a fair die one time if you rome a 2 and receive $1300 if you roll a 4 or six you receive $900 if you ore a 3 5 or 9 receive nothing. find expected value for this game. based on value is it a good game to play?

    asked on July 13, 2013


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