Popular questions and responses by Emma
  1. math

    you invest $4000 in an account that pays simple interest of 6% for 30 years. calculate the amount of money you'll have at the end of the indicated time period.

    asked on May 16, 2013
  2. Chemistry

    What would the net ionic equation be for : HBr (aq) + KOH (aq) = KBr + H2O

    asked on October 15, 2017
  3. Economics

    What is true of education spending? A. It is a significant expense of state governments. B. It costs the federal government more than Social Security benefits. C. It has increased at a greater rate than health care spending. D. It is the largest part of

    asked on October 10, 2019
  4. MATH

    One light flashes every 2 minutes and another light flashes every 3.5 minutes. Suppose both lights flash together at noon. What is the first time after 1 PM that both lights will flash together ?

    asked on June 26, 2012
  5. Economics

    Read the statement. Economists note that personal income rose by 5 percent last year. What impact will the change in personal income have on-demand? A. It will cause the demand curve to shift down. B. It will cause the demand curve to shift right. C. It

    asked on October 30, 2019
  6. Economics

    Which best describes Robert Owen’s political ideology and its impact on business? He was a Communist who believed business could only flourish if the government owned it. He believed in a laissez-faire political system and the absence of government in

    asked on September 26, 2019
  7. calculus

    If 800 feet of fencing is used to enclose a rectangular plot of land that borders a river, what is the maximum area that can be enclosed? Answer to the nearest square foot without commas. For example, if the answer is 1,000, write 1000.

    asked on April 22, 2015
  8. Economics

    What prevents a monopolistic competition from being perfectly competitive? A. Consumers are not knowledgeable. B. The market is dominated by one firm. C. Products are not identical. D. The barriers to entry are significant. Is it A?

    asked on October 7, 2019
  9. Chemistry

    The temperature rises from 25.00 °C to 29.00 °C in a bomb calorimeter when 3.50 g of sucrose undergoes combustion in a bomb calorimeter. Calculate ÄErxn for the combustion of sucrose in kJ/mol sucrose. The heat capacity of the calorimeter is 4.90 kJ/°C

    asked on December 6, 2012
  10. Chemistry

    combustion analysis of 63.8 mg of C,H, and O containing compound produced 145.0 mg of CO2 and 59.38 mg of H2O. What is the empirical formula for the compound?

    asked on December 6, 2012
  11. Algebra

    10. A moving van company charges a fee of 35.00 dollars for the truck rental and 25 cents for every mile the truck travels from the loading location. Let y be the cost in dollars for using the truck for x miles. Write the slope-intercept form of the

    asked on July 10, 2020
  12. Algebra

    1. Three times the width of a certain rectangle exceeds twice its length by two inches. Four times its length is twelve more than its perimeter. Write a system of equations that could be used to solve this problem. (hint: P = 2L + 2W) 2. Your mother has

    asked on July 15, 2020
  13. math

    12. An electrician charges a 45.00 dollars travel fee plus 30.00 dollars per hour of labor. Let y be the cost in dollars for x hours of work. Write the slope-intercept form of the equation. 13. Using the equation from number 12, if the electrician works 3

    asked on July 10, 2020
  14. Urgent math

    The initial size of a culture of bacteria is 1000. After one hour the bacteria count is 4000. (a) Find a function n(t) = n0ert that models the population after t hours. n(t) = b)Find the population after 1.5 hours. (Round your answer to the nearest whole

    asked on August 3, 2015
  15. Chemistry

    What volume of a 15.0% by mass NaOH solution, which has a density of 1.116 g/mL, should be used to make 4.40 L of an NaOH solution with a pH of 10.5?

    asked on March 17, 2013
  16. Trigonometry

    Given that sin^2x = 4/13, what is the cos^2x? I am so lost. I need to show my work. Please help. THANK YOU!

    asked on August 30, 2017
  17. Chemistry

    The complex ion, [Ni(NH3)6]2+, has a maximum absorption near 580 nm. Calculate the crystal field splitting energy (in kJ/mol) for this ion.

    asked on December 6, 2012
  18. Psychology

    5.Regarding the trichromatic theory of color vision, which statement is most accurate? A. The theory maintains that receptor cells are grouped in pairs, such as black-white. B. Specialized cells in the retina engage in a process called feature detection.

    asked on May 4, 2016
  19. Chemistry

    What element is undergoing oxidation (if any) in the following reaction? CH4(g) + 2 O2(g) ¨ CO2(g) + 2 H2O(g)

    asked on December 6, 2012
  20. Calculus

    A cylindrical tank is to have a capacity of 1000 m³. It is to fit into a foundry that is 12 m wide with a height of 11 m. The base of the tank will cost half as much as the top. The metal for the side of the tank will cost four fifths as much as the top.

    asked on June 10, 2019
  21. Chemistry

    Which of the following is NOT true for ΔGrxn? A.) If ΔG°rxn > 0, the reaction is spontaneous in the forward direction. B.) If Q = 1, then ΔGrxn = ΔG°rxn.If ΔG°rxn = 0, the reaction is spontaneous in the reverse direction. C.) If ΔG°rxn > 0, the

    asked on November 16, 2014
  22. calculus

    An oil pipeline will connect points A and B which are 3 km apart and on opposite banks of a 1 km wide river. From point A to point C on the opposite bank, the pipeline will run under the water. From point C to point B the pipeline will run above ground.

    asked on June 10, 2019
  23. history

    How did feudal monarchs in the High Middle Ages centralize power? need explanation

    asked on October 11, 2016
  24. History

    Which explains why the Compromise of 1850 intensified the argument about slavery? A- People for and against slavery migrated to Western stats to influence laws. B~Free states in the West added more antislavery votes to Congress. C~The equal division of

    asked on April 27, 2015
  25. Math-Probability

    A law firm has six senior and fourteen junior partners. A committee of 3 partners is selected at random to represent the firm at a conference. What is the probability that at least one of the junior partners is on the committee?

    asked on March 16, 2012
  26. Chemistry

    Determine the volume of H2S (at 375 K and 1.20 atm) needed to produce 55.0 g of S. Assume that there is excess SO2 present. 2 H2S(g) + SO2(g) ¨ 3 S(s) + 2 H2O(g)

    asked on December 6, 2012
  27. calculus

    The area A = πr2 of a circular water ripple changes with the radius. At what rate does the area change with respect to the radius when r = 4ft?

    asked on April 13, 2015
  28. AP calc

    Use the method of cylindrical shells to find the volume V generated by rotating the region bounded by the given curves about the specified axis. y = 8x − x^2, y = 12; about x = 2

    asked on February 19, 2015
  29. physics- please help !

    A box weighing 65.0 N rests on a table. A rope tied to the box runs vertically upward over a pulley and a weight is hung from the other end. Part a) Determine the force that the table exerts on the box if the weight hanging on the other side of the pulley

    asked on May 6, 2012
  30. Chemistry

    A chemistry student needs to standardize a fresh solution of sodium hydroxide. She carefully weighs out 338.mg of oxalic acid H2C2O4 , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in 250.mL of distilled water. The

    asked on November 7, 2018
  31. Math

    If two cylinders are similar, find the scale factor of the smaller figure to the larger figure. The surface area of the smaller area is 20 pi yards squared. The surface area of the larger cylinder is 125 pi yards squared. No radius or height is given, and

    asked on March 26, 2017
  32. calculus

    In the space below, provide the smaller of the two positive integers that add to 40 and have the largest possible product

    asked on April 22, 2015
  33. maths

    each of the students in a class writes a dirrerent 2 digit number on the whiteboard. the teacher claims that no matter what the students write, there will be at least three numbers on the whiteboard whose digits have the same sum. what is the smallest

    asked on July 7, 2007
  34. Economics

    Please help me. What are the primary reasons people choose to invest and trade stocks? (Select all that apply.) to earn capital gains*** to earn predictable quarterly interest to earn a dividend*** to earn liquid money

    asked on October 31, 2019
  35. physics

    a delivery person pulls a 20.8 kg box across the floor. the force exerted on the box is 95.6n (35 above the horizontal). the force of kinetic friction on the box has a magnitude of 75.5n. the box starts from rest. using the work-energy theorem determine

    asked on March 18, 2019
  36. Psychology

    9.By means of introspection, Dr. Marsh attempts to determine the components of things like perception, thinking, and consciousness. By contrast, Dr. Smyth wants to understand what the mind does in producing different kinds of behavior. We can reasonably

    asked on May 4, 2016
  37. chemistry

    Choose the bidentate ligand from the substances below. A) cyanide ion B) ammonia C) EDTA D) carbon monoxide E) ethylenediamine

    asked on December 6, 2012
  38. physics

    question : net force of 225 N accelerates a bike and rider at 2.65m/s^2. What is the mass of the bike and rider together ?

    asked on April 29, 2012

    a locomotive pulls 10 identical freight cars. the force between the locomotive and the first car is 100,000 Newtons, and the acceleration of the train is 2m/s^2. there is no friction to consider.what is the force between the ninth and tenth cars?

    asked on July 7, 2014
  40. physics help plz

    One 3.5 kg paint bucket is hanging by a massless cord from another 3.5kg paint bucket, also hanging by a massless cord, as shown in the figure . Part a) If the buckets are at rest, what is the tension in lower and higher cord ? Part b)If the two buckets

    asked on May 6, 2012
  41. Economics

    In what key area do the benefit principle of taxation and the ability-to-pay principle of taxation differ? A. how taxes should be collected B. which types of items should be taxed C. who should pay the taxes D. what percentage of income should be taxed Is

    asked on October 10, 2019
  42. Economics

    What is true regarding taxes in a market economy? They tend to be high because the government is more efficient. They tend to be high so that the government can develop a budget surplus. They tend to be low in order to encourage work. They tend to be low

    asked on September 26, 2019
  43. Algebra 2(help please!!)

    1. Tony decides to use observation. He visits 10 students and observes them doing schoolwork at home for 30 min. If a student looks at social media during that time, he notes it. (a) Provide an advantage of using observation. (b) Provide a disadvantage of

    asked on December 7, 2016
  44. Physics

    A 15 kg uniform disk of radius R = 0.25 m has a string wrapped around it, and a m = 3.3 kg weight is hanging on the string. The system of the weight and disk is released from rest. When the 3.3 kg weight is moving with a speed of 2.1 m/s, what is the

    asked on March 12, 2012
  45. Chemistry

    How many atoms of carbon are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol.

    asked on December 6, 2012
  46. History

    1.Which answer best describes a reason why industries flourished in New England? A- The people in New England had more work experience. B- New England had more lakes to use for water in factories. C- The soil was better than in the South so they could grow

    asked on April 28, 2015
  47. History

    1. How did new England's textile industry affect both children and women? a) It allowed them to earn a living wage until the age of 25. b) It gave them opportunities not available on family farms. c) It permitted them to complete their schooling. d) It

    asked on March 24, 2015

    a 100kg street light is supported equally by two ropes. one rope pulls up and to the right 40 degrees above the horizontal; the other pulls up and to the left 40 degrees . what is the tension of the rope?

    asked on July 11, 2014
  49. Physics

    Vectors A and B are in the xy plane and their scalar product is 20.6 units.? If A makes a 27.8 angle with the x axis and has magnitude A= 14.8 units, and B has magnitude B= 29.0 units, what can you say about the direction of B?

    asked on November 17, 2012
  50. Psychology

    13.Within the cerebral cortex, the _______ area is found in the occipital lobe. A. visual B. association C. somatosensory D. main auditory 14.Dr. Lombard's research is focused on the capacity of the human mind to store and retrieve information. Her

    asked on May 4, 2016

    two masses m1=400.g and m2 =600.g are connected with a light string which goes over a frictionless pulley of negligible mass. the two systems are released from rest. a) what is the acceleration of each mass? b) what is the tension force in the string? and

    asked on July 21, 2014
  52. Algebra

    A population of ants is growing at a rate of 10% per month. What is the growth factor?

    asked on June 28, 2014

    undigested food enters the intestine called the ? chyme is this answers right ? PLEASE HELP ME

    asked on April 21, 2014
  54. math

    Assume you want to accumulate $125,000 for a long-range goal in 40 years. You have two choices. Plan A is an account with annual compounding and an APR of 5%. Plan B is an account with continuous compounding and an APR of 4.5%. How much of an investment

    asked on May 14, 2013
  55. Trigonometry

    Prove that tanx+cotx=2sec(2x) Thank you! :)

    asked on January 7, 2013
  56. Math

    find the greatest four-digit number that has exactly three positive factors.

    asked on October 14, 2010
  57. Chemistry

    HA +H2O ---> A- +H3O+ In the equation is HA a strong acid?

    asked on April 24, 2020
  58. Math

    Hi! I just want someone to check my answers please! I cannot provide you with any pictures as I have gotten them off of my schools website. You cannot access these pictures because you have to be logged in. 1. Andrea drew triangle JKL as shown. A. The sum

    asked on February 16, 2017
  59. algebra

    Match the inequality to its graph. A. less than or equal to -1 B. less than 3 C. less than 1 D. less than or equal to -3 7. 4y + 3 *less than or equal to* y+6 8. -2y > 2 9. y over 3 < -1 10. 3y *less than or equal to* 2y +

    asked on September 30, 2016
  60. Psychology

    Dr. Jones is interested in how human behavior may be genetically inherited from remote ancestors, such as chimpanzees. Her field of interest is A. chemical psychobiology. B. evolutionary psychology. C. clinical neuropsychology. D. behavioral genetics. I

    asked on May 4, 2016
  61. calculus

    The height of a cylinder with a fixed radius of 4 cm is increasing at the rate of 2 cm/min. Find the rate of change of the volume of the cylinder (with respect to time) when the height is 14cm.

    asked on April 13, 2015
  62. Chemistry

    Thyroxine, an important hormone that controls the rate of metabolism in the body can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0 g of benzene, the freezing point of the solution could be measured as 5.144°C. Pure

    asked on January 21, 2013
  63. Chemistry

    Calculate the molar enthalpy for the following reaction. HCl(aq) + NH3 (aq) --> NH4Cl (aq). HCl = 50 ml (2.00M) NH3 = 50 ml (2.05 M) Delta T = 9.28 degrees Celsius. Ccal = 28.9J/g degrees celcius.

    asked on November 12, 2012
  64. chemistry

    Liquid hexane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 3.45 g of hexane is mixed with 16.3 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Be

    asked on December 6, 2011
  65. Algebra

    A regular pentagon and an equilateral triangle have the same perimeter. The perimeter of the pentagon is 5 (1/2x +2) inches. The perimeter of the triangle is 4(x-2) inches. What is the perimeter of each figure?

    asked on July 16, 2019
  66. Algebra

    Simplify the rational expression. State any restrictions on the variable. t^2+4t-12/t^2-4

    asked on March 7, 2019
  67. science

    How do the Sun, Earth, and Moon depend on each other?

    asked on February 11, 2018
  68. Chem

    Separate the following balanced chemical equation into its total ionic equation. AgNO3​(aq)+NaCl(aq) --> NaNO3​(aq)+AgCl(s) (List the ions in order of the above equation.) Write the net ionic equation for the reaction above. (Make sure the cation is

    asked on October 16, 2017
  69. Math

    1. Simplify. 3x^2+ 5x-5x^2-4x+5-2 A.-8x^2-9x+3 B.2x^2+x+3 C.-2x^2-9x+3*** D.-2x^2+x+3 2. Add or Subtract.(8x – 2y) + (3x – 4y) A.11x+8y B.4x-y C.11x-6y*** D.5x+2y 3.(5x^2-4x-1)-(-4x^2-4) A.-9x^2-8x-1 B.9x^2-4x+3*** C.x^2-4x-3 D.9x^2+4x-3 4.The distance

    asked on May 5, 2016
  70. Algebra

    A person invested $7000 for 1 year, part at 5%, part at 10%, and the remainder at 15%. The total annual income from these investments was $815. The amount of money invested at 15% was $200 more than the amount invested at 5% and 10% combined. Find the

    asked on November 24, 2015
  71. Algebra

    Which is an equivalent form of the expression 1800(1.2)–t? Is 1800(1/2)^t correct?

    asked on June 28, 2014
  72. Geometry

    Which if the following is equivalent to 7pi/4? A.285 degrees B. 305 degrees C. 315 degrees D. 330 degrees E. 375 degrees

    asked on May 4, 2014
  73. history

    what was the napoleonic code?

    asked on October 18, 2010
  74. Math

    Lily is very happy with the fuel efficiency of her new car. She estimates that she can drive 14 km per litre of gas. What is the word equation?

    asked on March 24, 2020
  75. Economics

    Read the statement. A monopoly’s prices are determined by _[blank]_. Which most accurately completes the sentence? A. competing firms B. perfect competition C. the monopoly D. market equilibrium Is it A?

    asked on October 7, 2019
  76. Algebra

    What is the difference in simplest form? (n^2+3n+2)/(n^2+5n+6)-2n/(n+3) A. (1-n)/(n+3) B. 1/(n+3) C. (n+1)/(n+3) D. (n-1)/(n+3)

    asked on March 6, 2019
  77. math

    the perimeter of a rectangle with adjacent side lengths of x and y, where x>y, is 8 times as great as the shorter side to the rectangle. what is the ratio of y to x? a. 1:2 b. 1:3 c. 1:4 d. 2:3 is b the answer?

    asked on August 8, 2018
  78. science

    The iodine-131 nuclide has a half-life of 8.0 days. If you originally have a 257 g sample, after 48 days how much will you have?

    asked on May 5, 2017
  79. chemistry

    Which statement describes a chemical reaction at equilibrium? A. The forward reaction happens slightly faster than the reverse reaction. B. The reaction has stopped because all reactants have been used up. C. The forward reaction happens at the same rate

    asked on September 10, 2016

    I am so lost and confused right now with this question. I might have a quiz. Help me understand before this pop quiz!!!! THANKYOU A diver runs horizontally with a speed of 1.2 m/s off a platform that is 10.0 meters above the water. a) how long before the

    asked on February 3, 2016
  81. Math

    the terminal side of an angle in standard position coincides with the line x-2y=0, what is the cosine to the nearest ten-thousandth??? I am completely lost with this one

    asked on January 6, 2016
  82. Language

    In "All Together Now," why does Barbara Jordan most likely mention the conflict in Bosnia? A.It shows that people of different ethnic backgrounds can live in peace. B.It shows that improvements in race relations are still necessary despite past progress.

    asked on December 2, 2015
  83. Math

    Which of the following options is an equivalent function to f(x) = 3(2)3x? A.f(x)= 3(8)x B.f(x)= 24x C.f(x)= 27(8)x D.f(x)= 3(8x)

    asked on November 4, 2015
  84. Honors English 11

    Can someone check my answer please? Q: Read and analyze "When I heard the learn'd Astronomer" by Walt Whitman. What romantic ideas does it express, and how does the structure of the poem reinforce the meaning? -When i heard the learn'd astronomer; When the

    asked on October 29, 2015
  85. Algebra

    Which special case is represented by x^2-121? A. the difference of two squares B. the difference of cubes C. the square of a binomial D. the sum of cubes

    asked on July 9, 2014

    a car is proceeding at a speed of 14.0m/s when it collides with a stationary car in front. during the collision the first car moves a distance of 0.300 m as it comes to a stop. the driver is wearing her seat belt, so she remains in her seat during the

    asked on July 5, 2014
  87. Chemistry

    How much water would I need to add in order to dilute 200mL of a 5 M solution down to 2 M?

    asked on February 21, 2014
  88. physics

    A car sits in an entrance ramp to a freeway, waiting for a break in the traffic. The driver sees a small gap between a van and an 18-wheel truck and accelerates with constant acceleration along the ramp and onto the freeway. The car starts from rest, moves

    asked on September 29, 2013
  89. physics

    Cliff divers at Acapulco jump into the sea from a cliff 37.1 m high. At the level of the sea, a rock sticks out a horizontal distance of13.39 m. The acceleration of gravity is 9.8 m/s^2. With what minimum horizontal velocity must the cliff divers leave

    asked on February 19, 2013

    3. What is the rhyme scheme of the following Anne Bradstreet poem? To Her Father with Some Verses Most truly honored, and as truly dear, If worth in me or ought I do appear, Who can of right better demand the same Than may your worthy self from whom it

    asked on September 4, 2012
  91. Math

    How many ways can a person select 3 movies to rent from the top ten rentals? Arrange them into a triple feature?

    asked on May 31, 2011
  92. Chemistry

    How do I calculate the amount of heat needed to convert 96g of ice at -24 degrees celciua to water at 28 degrees celciua?

    asked on April 26, 2011
  93. biology

    If an atom of sulfur (atomic number 16) were allowed to react with atoms of hydrogen (atomic number 1), which of the molecules below would be formed? a.S-H b.H-S-H c.H-S-H | H d.H | H-S-H | H e.H=S=H

    asked on December 11, 2008
  94. Chemistry

    What is the Lewis structure for IF4-?

    asked on March 10, 2008
  95. Science

    I have some equations that I would like checked. Thanxs! 1. An automobile starts from rest and accelerates at 3m/s2 for 4 seconds. How fast is it going after acceleration? 3m/s^2 / 4 = .75 m/s 2. If an automobile travels at 30 km/hr. for 2 hours, how far

    asked on August 26, 2007
  96. Economics

    Help me with this, please. Read the statement. Economists note that personal income rose by 5 percent last year. What impact will the change in personal income have on-demand? It will cause the demand curve to shift down. It will cause the demand curve to

    asked on October 31, 2019
  97. Pre-Algebra A

    A company reports $23,765 in income and $18,945 in expenses for February. What was the amount of profit or loss for the month? A. $4,820 profit B. $4,820 loss C. $5,220 profit

    asked on February 13, 2019
  98. Biology

    What would happen if the gametes forming a zygote is diploid?

    asked on July 18, 2017
  99. chemistry help!!! please!!! DrBob222 I need you!!

    The G value for formation of gaseous water at 298 K and 1 atm is -278 kJ/mol. What is the nature of the spontaneity of formation of gaseous water at these conditions? A. The reaction is sometimes spontaneous. B. The reaction is spontaneous. C. The reaction

    asked on August 20, 2016
  100. Psychology

    3.If you adopt the _______ perspective, you'll reject an emphasis on what goes on in people's minds in favor of focusing on measurable behaviors that can be objectively measured. A. psychodynamic B. neuroscience C. cognitive D. behavioral 4.Agatha

    asked on May 4, 2016


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