Popular questions and responses by Erica
  1. Pre-Calculus

    The formula D= 5e ^-0.4h can be used to find the number of milligrams D of a certain drug that is in a patient's bloodstream h hours after the drug has been administered. When the number of milligrams reaches 2, the drug is to be administered again. WHat

    asked on October 10, 2006
  2. Calc

    The number of bacteria in a culture is increasing according to the law of exponential growth. There are 125 bacteria in the culture after 2 hours and 350 bacteria after 4 hours. a) Find the initial population. b) Write an exponential growth model for the

    asked on January 6, 2011
  3. Physics

    A 50.0 g silver spoon at 20.0 degrees Celsius is placed in a cup of coffee at 90.0 degrees C. How much heat does the spoon absorb from the coffee to reach a temp. of 89.0 degrees C? Rememeber this equation. It, or a slight modification of it, will work all

    asked on November 21, 2006
  4. History

    Which identifies the covert Armenian mission to assassinate high-ranking Ottoman officials responsible for the Armenian Genocide? Operation Overlord Gallipoli Campaign Operation Nemesis Justice Mission

    asked on July 10, 2020
  5. physics

    How much heat is necessary to change 500g of ice at-10 celsius to water at 20 celsius?

    asked on October 15, 2012
  6. Calc

    Use differentials to approximate the change in the volume of a cube when the side is decreased from 8 to 7.99 cm. (in cm^3) Thank you so much!!

    asked on April 25, 2011
  7. Calc

    A body of an unknown temperature was placed in a room that was held at 30°F. After 10 minutes, the body's temperature was 0°F, and 20 minutes after the body was placed in the room the body's temperature was 15°F. Estimate the body's initial temperature.

    asked on January 6, 2011
  8. Science-Physics

    You push a 67 kg box across a floor where the coefficient of kinetic friction is uk = .55. The force you exert is horizontal. (a) How much power is needed to push the box at a speed of .50 m/s? (b) How much work do you do if you push the box for 35 s?

    asked on January 9, 2011
  9. Calc

    Let f be the function given by f(x) = tan x and let g be the function given by g(x) = x^2. At what value of x in the interval 0≤x≤π do the graphs of f and g have parallel tangent lines?

    asked on January 2, 2011
  10. Psychology

    Classical Conditioning. 1)Terell feels ill every time he sees a Wendy's restaurant sign. Two weeks ago while on his lunch break, he went to Wendy's and ate a chicken sandwich. He was not aware that the chicken was spoiled. a. Name the Unconditioned

    asked on July 12, 2015
  11. Statistics

    A group of 56 randomly selected students have a mean score of 30.8 and a standard deviation of ó = 4.5 on a placement test. Find a 95% confidence interval for the mean score, ì, of all students taking the test.

    asked on November 1, 2010
  12. Differential Equations

    Consider the differential equation: dy/dt=y/t^2 a) Show that the constant function y1(t)=0 is a solution. b)Show that there are infinitely many other functions that satisfy the differential equation, that agree with this solution when t0 [Hint: you need to

    asked on January 31, 2013
  13. Chemistry

    I need help please I am so confused. How much dry solute would you take to prepare each of the following solutions from the dry solute and the solvent? I know the MM of KCl is 74.55 107g of 0.535m KCl

    asked on September 18, 2012
  14. Algebra 2

    From 1990 to 1994, the mail order sales of health products in the United States can be modeled by S = 10t 3 + 115t 2 + 25t + 2505 where S is the sales (in millions of dollars) and t is the number of years since 1990. In what year were about $3885 million

    asked on December 30, 2011
  15. Calc

    If f(x) = e^(sin x), how many zeros does f '(x) have on the closed interval [0, 2π]?

    asked on January 2, 2011
  16. History

    What is Social Darwinism? A.)the theory that the principle of natural selection applies to humans as well as animals and plants B.)the idea that other societies have to accept European culture in order to be regarded as civilized C.)the application of

    asked on July 7, 2020
  17. Math 221

    what is 13/15 divided by 7/10

    asked on July 13, 2014
  18. Finance

    Determine the annual net cost of this checking account? Annual interest of 2.5% paid if balance exceeds $750, $8 monthly fee if account falls below minimum balance, average balance $815, account falls below $750 during 4 months. Is my answer correct? 815 *

    asked on August 8, 2013
  19. Pre Calculs

    The pH of a chemical solution is given by the formula pH = -log10 [H+] where [H+] is the concentration of hydrogen ions in moles per liter. Values of pH range from 0 (acidic) to 14 (alkaline). (a) what is the pH of the solution for which [H+] is 0.1? (b)

    asked on October 10, 2006
  20. Chemistry

    The density of aluminum is 2.70 g/ml. What is the mass of a cube of Al that measures 2.20 cm on each side?(remember significant figures and to include the units of g in your answer, remember that 1 ml=1 cm3)

    asked on September 14, 2015
  21. Managarial Finance

    "Stephenson Real Estate Company was founded 25 years ago by the current CEO, Robert Stephenson. The company purchases real estate, including land and buildings, and rents the property to tenants. The company has shown a profit every year for the past 18

    asked on October 8, 2012
  22. Calc

    Find the area of the largest rectangle that can be inscribed under the curve y = e^(-x^2) in the first and second quadrants.

    asked on December 7, 2010
  23. Physics

    Which provides more cooling for a styrofoam cooler, one with 10 lbs of ice at 0 degrees C or one with 10 lbs of ice water at 0 degrees C. Explain. qice=mass*heat of fusion. qH2O=mass*specific heat x delta T However, you aren't given a two temperatures;

    asked on November 21, 2006
  24. Chemistry

    Calculate the change in enthalpy produced by dissolving 14.3 g of NaOH in 65.0 g of water if the temperature increases 49.1°C and the specific heat of water is 4.18 J/g°C Do I have to use the 14.3g of NaOH?

    asked on February 7, 2018
  25. chemistry

    Convert 1.01 x 10-8 seconds to nanoseconds

    asked on September 14, 2015
  26. Psychology

    Classical Conditioning. 2. Pat feels fear whenever she sees snow. Not too long ago, she got into a car accident on a snowy road. a. Name the unconditioned stimulus(US): Car accident b. Name the conditioned stimulus(CS): Seeing snow c. Name the

    asked on July 12, 2015
  27. math

    a small farm field is a square measuring 340 ft on a side. what is the perimeter of the field?

    asked on July 26, 2013
  28. weber state university

    CH2=CH-CH2CH3+H2O What is the product of the reaction above

    asked on April 11, 2013
  29. stats

    A company with a large fleet of cars found that the emissions systems of 18 out of the 65 randomly selected cars they tested failed to meet pollution control guidelines. Is this strong evidence that more than 20% of the fleet might be out of compliance?

    asked on May 11, 2011
  30. Physics

    A bag of sugar weighs 4.00 lb on Earth. What would it weigh in newtons on the Moon, where the free-fall acceleration is one-sixth that on Earth? 1 N Repeat for Jupiter, where g is 2.64 times that on Earth. 2 N Find the mass of the bag of sugar in kilograms

    asked on September 16, 2010
  31. History

    What was the outcome of the 1914 Battle of Tannenberg on the eastern front? The battle resulted in a stalemate as both Russian and German armies suffered heavy losses. The battle caused Russia to seek a peace treaty to end its conflict with Germany. Russia

    asked on July 9, 2020
  32. Mathematics

    The segment shown is half of AB, where B (-5,1) is one endpoint of the segment and M (-3,3) is the midpoint of the segment. What are the coordinates of point A

    asked on June 5, 2020
  33. math

    A certain test is worth 145 points. How man points are needed to obtain a score of $65%?

    asked on July 27, 2014
  34. Physics 1

    The drawing shows three particles far away from any other objects and located on a straight line. Particle B is located in the middle of particles A and C. The distance between particles A and B is 0.500 m. The distance between particles B and C is 0.250

    asked on February 19, 2014
  35. math

    a popular tourist attraction in ottawa is the Peace tower, which rises from the Center Block of the Parliment buildings. Describe at least one method that you could use to estimate the height of the tower, including the measurments you would need to make.

    asked on August 13, 2012
  36. alg

    An amplifier has an input power of 5 mW. The output power is 100 mW. What is the decibel gain to the nearest decibel?

    asked on June 28, 2012
  37. Algebra 2

    Find the value of c that makes the expression a perfect square trinomial. Then write the expression as the square of a binomial. I didn't really understand what that meant. x^2-23x+c x^2-(2/7)x+c

    asked on December 5, 2011
  38. global history

    the wealth that enabled the Italian city-states to lead in the development of Renaissance arts was derived mainly from? a)the quantities of gold and silver brought back to Italian explorers b)concentration of riches in the hands of the king and his court

    asked on May 31, 2011
  39. Calc

    How do you integrate sin²x?

    asked on February 2, 2011
  40. math

    the edges of a cube are 3 inches long. what is the surface area, in square inches, of this cube?

    asked on November 9, 2008
  41. Ethics in Criminal Justice

    The correlativity of rights and duties mean that: A. moral duties override moral rights. B. moral rights override moral duties. C. the existence of moral rights implies duties by which other must abide. D. None of the above. I think the answer is A but not

    asked on May 10, 2014
  42. Ethics in Criminal Justice

    Which of the following might help us develop open-mindedness and the virtue of tolerance? A. Recognizing that people have free will. B. Recognizing that moral norms can and often do vary by time and place. C. Developing our own sense of egoism. D. All of

    asked on April 21, 2014
  43. Ethics in Criminal Justice

    If we eliminate free will completely, we would also be eliminating: A. the possibility of genetic bases for human behavior. B. The value of modern science. C. Moral responsibility. D. Excuses for criminal conduct.

    asked on April 13, 2014
  44. algebra1

    the problem is 5f+7 less than or equal to 22. can anyone please work this out for me and check it for me? and what i mean by checking it is like when you get the answer you check it and make sure its write.

    asked on October 1, 2013
  45. Physics!

    Imagine a giant dry-cleaner's bag full of air at a temperature of -31 floating like a balloon with a string hanging from it 15 above the ground. Estimate what its temperature would be if you were able to yank it suddenly back to Earth's surface.

    asked on May 2, 2013
  46. Differential eqns

    a) Sketch the phase line for the differential equation dy/dt=1/((y-2)(y+1)) and discuss the behavior of the solution with initial condition y(0)=1/2 b) Apply analytic techniques to the initial-value problem dy/dt=1/((y-2)(y+1))), y(0)=1/2 and compare your

    asked on February 3, 2013
  47. Consumer/Bus Math Sem 1 (Standard)

    Pat worked 43 hours and received $7.25 per hour for regular pay and time-and-a-half for all hours over 40 hours. What were her weekly earnings? $22.83 $322.63 $269.75

    asked on December 18, 2012
  48. statistics

    a mean score on a standardized test is 50 with a standard deviation of 10. What are the following: 1. what scores fall between -1 and +1 standard deviation? 2. what percent of all scores fall between -1 and +1 standard deviation? 3. what score falls at +2

    asked on May 11, 2012
  49. Math

    Nico was stunned when he opened the mail. Here was a check for $322.50! This was the interest he earned on his investment. One year ago Nico had been given $5,000. His parents made him put it in the bank and save it for college, but they said he could keep

    asked on April 16, 2012
  50. Chem

    Epsom salts consist of magnesium sulfate heptahydrate. Write its formula. a) How many atoms of oxygen are in 5.15g of Epsom salts? b) How many formula units of the compound are present in 5.15g? c) How many moles of water molecules are in 5.15 g of Epsom

    asked on October 7, 2011
  51. chemistry

    at 327 degrees C, the equilibrium concentrations are [CH3OH]=0.15M, [CO]=0.24M, and [H2]=1.1M for the reaction: CH3OH(g)CO(g)+2H2(g) Calculate Kp at this temperature

    asked on February 16, 2011
  52. Physics (Help!)

    You throw a glove straight upward to celebrate a victory. Its initial kinetic energy is K and it reaches a maximum height H. What is the kinetic energy of the glove when it is at the height H/2?

    asked on January 9, 2011
  53. Calc

    If dy/dx = x²y², then d²y/dx² = ?

    asked on January 2, 2011
  54. Calc

    Use implicit differentiation to find dy/dx. ln xy + 5x = 30

    asked on December 2, 2010
  55. Social studies

    which of the following best illustrates how a president can use the news media to reach the largest segment of the public? 1. hold a state dinner for foreign dignitaries 2. hold a conference with cabinet members 3. meet with heads of congressional

    asked on March 10, 2019
  56. Probability/Distribution

    A catalyst researcher states that the diameters (in microns) of the pores in a new product catalyst she has made have an exponential distribution with parameter ë = 0.25 (35 pts). (a) Determine the mean pore size. (b) Determine the standard deviation of

    asked on October 11, 2016
  57. Engineering Math

    Assume that the number of fish P(t) after t years grows according to the logistic equation dP/dt= P(a-bP) = bP(300 − P) Find the solution of this DE (with the given initial value at t = 0) as a separable equation. Your solution formula will contain b as

    asked on September 27, 2016
  58. Calculus

    A 20m ladder is leaning against a wall. Top of ladder is sliding down at 3m per second and the bottom is sliding away from the wall at 4m per second. How high is the top of the ladder and far is the bottom of the ladder from the wall.

    asked on July 23, 2016
  59. chemistry

    A student measure 9.43 mL of an unknown liquid in a graduated cylinder. The mass of the empty cylinder is 34.670 g, and the mass of the cylinder and liquid is 44.197 g. What is the density of the unknown liquid? (remember significant figures and units in

    asked on September 14, 2015
  60. math

    8 < 5 + y

    asked on July 27, 2014
  61. Ethics in Criminal Justice

    The power to make choices and engage in actions that originate with ourselves is referred to as: A. Free will B. Objectivism. C. Determination. D. Predetermination.

    asked on April 13, 2014
  62. algebra

    A newspaper carrier has $4.00 in change. He has two more quarters than dimes but five times as many nickels as quarters. How many of coins of each type does he have. This is what I got so far and then I get lost. dimes = x quarters = x+2 nickels = 5(x+2)

    asked on February 12, 2014
  63. Differential Equations

    a) Sketch the phase line for the differential equation dy/dt=1/((y-2)(y+1)) and discuss the behavior of the solution with initial condition y(0)=1/2 b) Apply analytic techniques to the initial-value problem dy/dt=1/((y-2)(y+1))), y(0)=1/2 and compare your

    asked on February 3, 2013
  64. science

    19. The term chromatin refers to a. the color of certain cells b. chromosomal DNA c. the fluid within the nucleus d. ribosomal RNA

    asked on January 28, 2013
  65. calculus

    A fence 8 feet tall stands on level ground and runs parallel to a tall building. If the fence is 1 foot from the building, find the shortest ladder that will extend from the ground over the fence to the wall of the building.

    asked on October 11, 2012
  66. Chemistry

    2NaOH+2Al+2H2O --> 2NaAlO2+3H2 here is the reaction. If i am trying to find the mass of hydrogen produced and i am trying to convert .95 moles Al to moles H, which number from the reaction do I use for H when converting from moles to moles? Do I 6 because

    asked on March 9, 2012
  67. Math

    the design below grows each day, as shown. if the pattern continues to grow like this, how many tiles will there be in the design on the tenth day? on the fiftieth day? Day 1 1 tile Day 2 5 tiles Day 3 13 tiles

    asked on March 5, 2012
  68. Probability

    Assume that P(A) = 0.4, P(B) = 0.4, and P(A∪B) = 0.7. Find P(A∩B) and P(A complement ∩ B complement).

    asked on January 17, 2012
  69. Chem

    The field of nanotechnology offers some intriguing possibilities, such as the creation of fibers one atom wide. Suppose you were able to string together 1.00 mol Ag atoms, each of radius 144 pm, into one of these fibers by encapsulating them in carbon

    asked on October 8, 2011
  70. Chemistry

    A mixture of gases at 760.0 torr contains 35.0% nitrogen, 22.0% oxygen , and 43.0% carbon dioxide by volume. What is the pressure of the carbon dioxide gas in torr?

    asked on August 19, 2011
  71. Calc

    A particle moves along a path described by x=cos³t and y=sin³t. The distance that the particle travels along the path from t=0 to t=π/2 is... Thank you!

    asked on April 25, 2011
  72. Calc

    A rectangle is to be inscribed in a semicircle of radius 8, with one side lying on the diameter of the circle. What is the maximum possible area of the rectangle?

    asked on February 22, 2011
  73. Calc

    The slope of a curve at each point (x,y) is given by 4x - 1. Which of the following is an equation for this curve if it passes through the point (-2,3)? A) y=4x²-x-15 B) y=x²-4x-9 C) y=2x²-x-7 D) y=2x²-x E) y=2x²-x+7

    asked on January 23, 2011
  74. Calc

    y = x^2 y = 6 - x Find the area of the region by integrating (a) with respect to x and (b) with respect to y.

    asked on January 18, 2011
  75. Calc

    If y = (cos²x)/(1 + sin x), then dy/dx = ?

    asked on January 18, 2011
  76. health, safety, and nutrition for the young child

    a child who moved from throwing a ball using only an elbow movement to throwing a ball using her elbow, wrist, and shoulder is showing signs of _____ development. (a)intertask (b)spatial (c)joint-plate (d)intratask

    asked on January 17, 2011
  77. Anatomy and Physiology

    Urine passes from the bladder to the outside of the body through a tube called the .Urethra Muscles are attached to bones by structures called .Tendons Communication, integration, and control are the primary functions of two body systems called and .

    asked on January 12, 2011
  78. 5th grade Math

    I have to find the function rule that goes with this table... X Y 2 8 4 18 7 33 9 43 12 57 I've been trying to figure it out for an hour and can't find anything that works for all of them.

    asked on October 27, 2010
  79. Psychology

    This is a homework assignment for my Psychology course on Memory and learning. Find a Movie/video clip (1-3 mins)that demonstrate a concept / phenomenom relevant to learning and memory? My prof used Matrix (what we see is just our neuron firing) and Bourne

    asked on March 12, 2009
  80. 3rd grade

    The Pilgrims were seeking freedom

    asked on November 18, 2008
  81. Chem

    find pH of 0.050 M HCLO4 plus 0.050 M HBr> You must consider activities>

    asked on November 12, 2008
  82. 11th grade

    your pet dog runs around in circles, chasing his tail. Does this mean acceleration?

    asked on September 18, 2008
  83. Pre calc

    How do you write a quadratic equation in standard form for a given set of zeros?

    asked on August 2, 2008
  84. geometry

    what is the area of a rectangle with a width of 12 feet and a length of 10?

    asked on February 12, 2008
  85. pre-calculus

    the spread of oil leaking from a tanker is in the shape of a circle. If the radius r (in feet) of the spread after t hours is r(t)= 200 square root of t, find the area A of the oil slick as a function of the time t. You know that the area of a circle is

    asked on October 3, 2006
  86. History

    In which world regions or countries was the Seven Years’ War fought? a.)Australia, South America, China b.)North America, Western Europe, India c.)North Africa, Mexico, Japan d.)Scandinavia, Middle East, Afghanistan I think it is B

    asked on July 2, 2020
  87. Social studies

    what is the function or purpose of public radio and television in a democratic society

    asked on April 15, 2020
  88. Biology

    What is the difference between carbon-13 and carbon-14? A. the number of electrons B. the number of neutrons C. the number of nuclei Please help me and explain the answer and how you got it. I'm really struggling in this class.

    asked on September 26, 2018
  89. Introduction to computers

    It is important to plan a document before you create it. List three things you should identify and consider before you plan the layout and design of a document. Why?

    asked on May 16, 2018
  90. Pre algebra

    Please help I’m struggling with how to find the percent of change each decade and how to predict a future price. I can’t find any examples of this lesson for help Directions: You probably see them in the news all the time—predictions about prices,

    asked on December 8, 2017
  91. Math

    Suppose that license plates in a certain country are made up of three letters followed by 2 digits followed by 3 more letters. How many license plates can be made if no repetitions are allowed within each set. (That is, no repetition within the first set

    asked on November 4, 2017
  92. math

    A card is selected from a deck. Find the following probabilities. A standard deck of cards has 52 Cards. There are 13 values and 4 suits. Suits are Spades, Clubs, Diamonds and Hearts. Each suit has 13 cards. There are 3 face cards Jack, Queen, and King. a

    asked on July 3, 2017
  93. Algebra

    How much weight will a 4 I ch wide 4 inch high and 216 inches long beam support

    asked on March 5, 2017
  94. Cal 3

    Find critical points for f(x,y)= x^3+y^3-15x^2-6xy+18y^2+39x+138y I know you first take the partial derivative of x and y, but I am not sure where to go from there.

    asked on December 6, 2016
  95. Engineering Linear Equation

    At your initial meeting with your business partners for CellGenTech, you propose that the rate of change in the number of newly introduced cell lines that the company scientists should be able to produce should be proportional to the number of cell lines.

    asked on October 5, 2016
  96. chemistry

    A tank holds 52.9 cm3 of water. What is the volume in in3? (2.54 cm=1 in, Remember significant figures, but this answer does not need units, since the answer must be in in3)

    asked on September 14, 2015
  97. chemistry

    How many inches are in 2.41 m? (2.54 cm = 1 inch, remember significant figures and units)

    asked on September 14, 2015
  98. mat

    Becky used 5 teaspoons of mustard to make a 32 ounces of potato salad. How many teaspoons of mustard does she need to make 4 pounds of potato salad?

    asked on December 5, 2014
  99. Trig

    a ships navigator determines that the ship is moving through the water at 17.5mi/h with a heading of 26.3 degrees north of east but the ship is actually moving at 19.3 mi/h in a direction of 33.7 degrees north of east. What is the velocity of the current?

    asked on December 1, 2014
  100. Ethics in Criminal Justice

    The correlativity of rights and duties means that: A. moral duties override moral rights. B. moral rights override moral duties. C. the existence of moral rights implies duties by which others must abide. D. None of the above. I think it's B. Am I right?

    asked on May 8, 2014


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