Most popular questions and responses by anna
  1. Polynomials

    Write and simplify the polynomial represented by the model. (Model shows: 3 big blank squares, 2 long black rectangles, 3 small blank squares, 1 big black square, 6 small black squares) a. -2x^2 + 2x + 3 b. 2x^2 - 2x - 3 c. 3x^2 - 2x - 3 d. 2x^2 - 2x + 3

    asked on March 25, 2016
  2. Chemistry

    How can I make 100ml 0f 2N of HCl? purity is 35% and density is given as 1.18 g/mL

    asked on May 21, 2016
  3. Calculus

    If the volume of a cube is increasing at 24 in^3/min and the surface area of the cube is increasing at 12 in^2/min, what is the length of each edge of the cube? I know that dV/dt=24 and ds/ds=12. I also know that Volume=s^3 and Surface Area=6*s^2, but what

    asked on December 7, 2010
  4. math cal

    A plane flying horizontally at an altitude of 3 mi and a speed of 480 mi/h passes directly over a radar station. Find the rate at which the distance from the plane to the station is increasing when it is 6 mi away from the station. (Round to the nearest

    asked on November 17, 2010
  5. physics

    a pet truck is moving at 25m/s north, a dog inside moves at 1.75 m/s at angle 35 degrees east of north. What is the velocity of the dog relative to the road?

    asked on November 13, 2011
  6. Math help, anyone?

    Solve the proportion. Where necessary, round to the nearest hundredth. Plz help i really need 2 get this in!! 11. 9/10 = x/10 9 *** 90 10 100 12. x/4 = 6/7 168 0.21 28 3.43 13.Write the ratio as a fraction in simplest form. 22:36 14. Write the ratio as a

    asked on November 26, 2013
  7. Social Studies

    Which of the following is the largest ethnic group in china A.Han B.tibetan C. Uighurs D. Hui Which of the following is the staple crop of the north China plain A. Barley B. Rice C. Soybeans D. Wheat Crops grow well on the north China plain because the

    asked on November 24, 2014
  8. chemistry

    Rank the following elements by electron affinity, from most positive to most negative EA value: tellurium, bismuth, neon, sodium, iodine i tried Te, Bi, Na, I, Ne and it was incorrect.

    asked on November 6, 2014
  9. chemistry

    1. In the reaction 2Ca(s) + O2(g) → 2CaO(s), which species is oxidized?

    asked on November 12, 2015
  10. History

    According to Americans living in the cities what was I sign of a communist revolution in the United States and the rise of mass culture be labor strikes see the deportation of anarchist did the great migration

    asked on January 25, 2019

    What effect did the eastern front have on World War I? (Select all that apply.) The heavy Russian losses, combined with food and fuel shortages, led to the abdication of Czar Nicholas II. The eastern front weakened German and Austro-Hungarian forces,

    asked on August 5, 2018
  12. Living Environment(please check answers)

    1-true 2-false 3-not enough info Transplanting genetic material into bacteria is a simple task- 2 Under certain conditions, bacteria reproduce at a rapid rate-3 The continued use of insulin from animals many cause harmful side effects in some people- 1 The

    asked on March 12, 2012
  13. physics

    A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.5 x 10 exponent 5 kg, its speed is 27.0 m/s and the net braking force is 4.30 x 10 exponent 5 N, (A) what id its speed 7.50 s later? (b) how far has it

    asked on November 1, 2011
  14. English

    I am on my final exam and need to do the last two 16 point questions. Could someone help me out on the first one? Choose any two characters studied in Semester B, and compare them to one another. The characters that you choose may be characters in a story

    asked on June 11, 2018
  15. Algebra

    A ranger spots a forest fire while on a 45-meter observation tower. The angle of depression from the tower to the fire is 12 degrees. To the nearest meter, how far is the fire from the base of the tower? IS THE ANSWER 212 meters

    asked on February 18, 2012
  16. Social Studies

    Compare the tactics used by the French troops in the French and Indian War with those of the American patriots during the Revolution.

    asked on September 12, 2016
  17. chemistry

    Hi! Can you please check if my answers are correct? And, can you please tell me any other details you think are important to add. Also, the last two questions i have no clue how to answer. can you help? thanks so much! 3.A burning candle produces a

    asked on September 11, 2015
  18. chemistry

    Sodium chloride is decomposed into the elements sodium and chlorine by means of electrical energy. How many grams of chlorine gas can be obtained from 2.50 mol NaCl?

    asked on May 4, 2010
  19. Math

    There were d passengers in the train. 15% of all of them went in the first car, 20% went in the second car. How many passengers were in the rest of the train? D - 0.15d + (0.15d*0.2) + ? 0.15 + 0.03 = 0.18 I don't know what to do next?

    asked on April 3, 2017
  20. spanish

    Using the subject “usted” and the verb in the imperative, tell your instructor three things she or he must do. Then tell your instructor two things she or he must not do. You will be graded on accuracy and pronunciation. Provide your sentences in

    asked on April 18, 2011
  21. physics

    A slingshot consists of a light leather cup attached between two rubber bands. It takes a force of 32 N to stretch the bands 1.1 cm. a) What is the equivalent spring constant of the rubber bands? Answer in units of N/m.

    asked on February 24, 2011
  22. history

    1-Which of the following statements about literary movements is NOT true? (1 point) A A literary movement is a period that shares a particular set of ideas, concerns, or characteristics. B Ideas, concerns, or characteristics may be shared by literary

    asked on September 19, 2012
  23. Trigonometry

    Let (7,-3) be a point on the terminal side of theta. Find the exact values of cos of theta, sec of theta and cot of theta?

    asked on March 20, 2014
  24. Chemistry

    A 76.00-pound flask of mercury costs $151.50. The density of mercury is 13.534 g/cm3. a) Find the price of one cubic inch of mercury by calculating the following intermediate values. What is the price of one pound of mercury? =$1.99 What is the price of

    asked on February 10, 2014
  25. Math

    Draw two number lines that show 0.20 and 1/5 are equivalent

    asked on October 6, 2015
  26. math

    If tan(xy) = x, then dy/dx =

    asked on December 30, 2011
  27. Physics

    A loop circuit has a resistance of R1 and a current of 2.2 A. The current is reduced to 1.7 A when an additional 3 Ω resistor is added in series with R1. What is the value of R1? Assume the internal resistance of the source of emf is zero.

    asked on February 6, 2018
  28. physiology

    Which of the following statements is TRUE regarding bile? Bile is produced by the gall bladder, and secreted into the duodenum Bile is produced and secreted in response to CCK, which is in turn secreted primarily in response to high acidity of duodenal

    asked on April 26, 2010
  29. geometry

    The coordinates for a rhombus are given as (2a, 0), (0, 2b), (–2a, 0), and (0, –2b). Write a plan to prove that the midpoints of the sides of a rhombus determine a rectangle using coordinate geometry. Be sure to include the formulas.

    asked on January 8, 2013
  30. Physics

    A 50 cm diameter wheel rotates through 25 radians. How do I figure out the amount of distance it will move?

    asked on January 29, 2015
  31. Calculus

    If f(x)= sqrt(4sin(x)+2), then f'(0)=

    asked on December 8, 2010
  32. geometrey

    The grade of a road is 7%. What angle does the road make with the horizontal? I'm confused!! What is the grade of a road? Thanks for the help!

    asked on March 10, 2008
  33. Social Studies PLZ HELP ASAP

    Analyze the effect that plentiful harvests had on population in the ancient civilizations of the mainland's river valleys. Write a one-paragraph answer. Plz help me with this, i dont understand.

    asked on May 1, 2018
  34. Chemistry

    This is a problem I got on my Mastering Chemistry homework: Consider the following reaction: H2(g)+I2(g)⇌2HI(g) A reaction mixture at equilibrium at 175 K contains PH2=0.958atm, PI2=0.877atm, and PHI=0.020atm. A second reaction mixture, also at 175 K,

    asked on March 16, 2014
  35. Physics

    Location A is 3.00 m to the right of a point charge q. Location B lies on the same line and is 4.70 m to the right of the charge. The potential difference between the two locations is VB - VA = 45.0 V. What is the magnitude and sign of the charge?

    asked on February 5, 2007
  36. algebra

    Company A rents copiers for a monthly charge of $360 plus 12 cents per copy. Company B rents copiers for a monthly charge of $720 plus 6 cents per copy. What is the number of copies above which Company A's charges are the higher of the two?

    asked on July 20, 2013
  37. chemistry

    CH3OH(g) ----> CO(g) + 2H2 (g) (delta H =+90.7k) A) is heat absorbed or released in the course of this reaction? b) calculate the amount of heat transferred when 45.0g of CH3OH(g)is decomposed by this reaction at constant pressure. c) for a given sample of

    asked on October 17, 2011
  38. chemistry

    A chemist prepares a sample of hydrogen bromide and finds that it occupies 249 mL at 60◦C and 552 Torr. What volume would it occupy at 0◦C at the same pressure? Answer in units of mL

    asked on March 5, 2015
  39. Chemistry

    A student heats 5.128g of the sodium carbonate/sodium bicarbonate mixture to a constant mass of 4.256g. Determine the mass of sodium bicarbonate present in the mixture.

    asked on February 28, 2010
  40. Math

    Find the missing length, round to the nearest tenth if necessary. There is a picture it shows a right triangle with side a being 14 and side b being 9 side c is ? I dont understand please help. A 4.5 B5 C 10.7* D 11

    asked on March 4, 2019
  41. Physics

    A pair of speakers separated by distance d = 0.900 m are driven by the same oscillator at a frequency of 670 Hz. An observer originally positioned at one of the speakers begins to walk along a line perpendicular to the line joining the speakers as in the

    asked on June 8, 2015
  42. Calculus

    A particle is moving around the unit circle (the circle of radius 1 centered at the origin). At the point (.6 , .8), the particle has horizontal velocity dx/dt=3. What is its vertical velocity dy/dt at that point? I don't know what equation to use or

    asked on December 7, 2010
  43. chemistry

    A 2.00 L flask is filled with propane gas (C3H8)at 1.00 atm and -15.0 Degrees Celsius. What is the mass of the propane in the flask?

    asked on May 24, 2016
  44. Chemistry

    Using the following data 1. CU3+ + 2e- ---> Cu+ E1= 1.28V 2. CU2+ + e- ---> Cu+ E2= 0.15V 3. Cu2+ + 2e- ----> Cu(s) E3= 0.34V 3. Cu+ + e- ----> Cu (s) E4= 0.52V calculate the standard reduction potential for the reaction of Cu(III) to Cu(II). Is it .783 V?

    asked on November 9, 2014
  45. Spanish

    Okay so I have some online activities and I'm not sure what they are asking. Situaciones Completa las oraciones con el tiempo verbal adecuado. A. Situaciones probables o futuras Si Teresa no viene pronto, nosotros ______ (tener) que ir sin ella. B.

    asked on April 27, 2009
  46. Biology Check answers

    1.   Which of the following correctly describes the image below?    protein Molecule RNA Molecule amino Acid carboxylic Acid 2.   Glucose and fructose are monosaccharides that have the same chemical formula, C6H12O6. However, they do not react the

    asked on November 20, 2015
  47. Chemistry

    How many mL of 18 M H2SO4 are required to react with 250 mL of 2.50 M Al(OH)3 if the products are aluminum sulfate and water? How do i solve this?

    asked on April 30, 2010
  48. Geometry

    A rhombus has diagonals of length 4 and 10. Find the angles of the rhombus to the nearest degree. would the angles be 136 and 44?

    asked on March 10, 2008
  49. chemistry

    Calculate the amount of energy in the form of heat that is produced when a volume of 3.56 L of SO2(g) is converted to 3.56 L of SO3(g) according to this process at a constant pressure and temperature of 1.00 bar and 25.0 °C. Assume ideal gas behavior.

    asked on October 15, 2013
  50. Chemistry

    Calculate pH and concentration of H2SO3, H2SO3- and SO32- in NaHSO3 c=0,05M. Ka1= 1,23*10^(-2) Ka2= 6,6*10^(-8) Results attached are: a) [H2SO3]= 1,04x10-4 M, [SO32-]=1,3x10-4 M, [HSO3-]= 0,05 M but i keep getting different numbers.

    asked on January 7, 2016
  51. Pre-Calc

    1.) Suppose that y varies directly as x. If y is 5 when x is 30, the constant of variation is 150. True Or False 2.) If w varies directly as z and w = 9 when z = -6, find w when z = 3. 3.) If y varies directly as x and y = 2 when x = 4, find x when y = 4.

    asked on October 2, 2014
  52. Math please help urgent!!

    2. If m

    asked on February 18, 2016
  53. Physics

    You have 250 g of water in an aluminium calorimeter with a mass of 125 g. How long will it take to increase the temperature of the water and calorimeter from 20C to 37C if the system is heated by a resistive heating element with 8 V across the resistor and

    asked on April 12, 2015
  54. Cultural Anthropology

    In a band society, who would most likely be responsible for punishing a murderer

    asked on March 18, 2013
  55. AP Environmental Science

    A new trend in environmental susatinability is reclamation. Reclamation is taking any disturbed areas and trying to converth them back to natural state. Describe the costs, impacts, and success in reclaming a gold mine.

    asked on April 7, 2009
  56. Physics

    A 0.4 kilogram sample of Aluminum at 115 degrees Celsius is put into a container containing 0.5 kilograms of water at 15 degrees Celsius. Neglecting the small amount of energy absorbed by the container and knowing that the specific heat of Aluminum is 900

    asked on July 17, 2014
  57. probobility

    4 -letter "words" are formed using the letters A, B, C, D, E, F, G. How many such words are possible for each of the following conditions? (a) No condition is imposed. Your answer is : Preview (b) No letter can be repeated in a word. Your answer is :

    asked on March 22, 2016
  58. physics

    An object of mass m attached to a spring of force constant k oscillates with simple harmonic motion. The maximum displacement from equilibrium is A and the total mechanical energy of the system is E. What is the object's velocity when its potential energy

    asked on December 15, 2015
  59. Math

    Stem-and-Leaf plots Use stem-and-leaf plot to answer questions 1-3 ----|----- 5| 4, 5 6| 0, 6, 9 7| 2, 3, 4, 5, 5 8| 1, 2, 8, 9 9| 5, 6 Key: 5|4 = 54 1. What is the range of data? A. 40 B. 42 ** C. 54 D. 96 2. What is the median of the data? A. 64.5 B.

    asked on April 30, 2018
  60. Language Arts 6 A- Unit 3: Life Stories

    15. Which sentence contains an error in subject-verb agreement? a. A family of squirrels live in my yard. b. Nobody wants to go to bed early. c. Chris and Susan live in the city. d. A group of elephants is called a herd 5. This selection was most likely

    asked on November 29, 2017
  61. English

    Topic : persuasive essay on why you should or should not have a dog. (Don't be scared to say what you think I need the truth so that I can make a good grade) Do you have a dog? Everything about owning a dog seems to lead to better heart health . Dogs are

    asked on December 18, 2018
  62. Physics

    The Golden Gate Bridge in San Francisco has a main span of length 1.28 km, one of the longest in the world. Imagine that a steel wire with this length and a cross-sectional area of 4.00 x 10-6 m^2 is laid on the bridge deck with its ends attached to the

    asked on June 15, 2015
  63. Chemisty

    Fluorine gas can react with ammonia gas to produce dinitrogen tetrafluoride gas and hydrogen fluoride gas. This reaction is described by the following balanced equation: 5 F2 (g) + 2 NH3 (g) N2F4 (g) + 6 HF (g) What mass of hydrogen fluoride gas is

    asked on March 8, 2013
  64. Chemistry

    The bromine content of the ocean is about 65 grams of bromine per million grams of sea water. How many cubic meters of ocean must be processed to recover 1.0 pounds of bromine if the density of sea water is 1.0 x 103 kg/m3?

    asked on September 19, 2012
  65. Physics

    A - A boy runs 12.7 blocks North, 7.5 blocks Northeast, and 14.4 blocks West. Determine the length of the displacement vector that goes from the starting point to his final position. B - Determine the direction of the displacement vector. Use

    asked on October 22, 2017
  66. Chemistry

    Use the van der Waals equation of state to calculate the pressure of 3.60 mol of NH3 at 489 K in a 4.50-L vessel. Van der Waals constants can be found here. P= Use the ideal gas equation to calculate the pressure under the same conditions. P= I have tried

    asked on October 23, 2015
  67. AP Chem

    A chemist added an excess of sodium sulfate to a solution of a soluble barium compound to precipitate all of the barium ion as barium sulfate, BaSO4. How many grams of barium ion are in a 458-mg sample of the barium compound if a solution of the sample

    asked on November 3, 2008
  68. Spanish

    Are my answers correct? Parte I: Conteste las preguntas en frases completas en español 1. ¿Qué significan las palabras te y té? Te es un pronombre, mientras que el té es una bebida. 2. ¿Prefiere Ud. usar el tiempo futuro o IR A + infinitivo? ¿Por

    asked on April 10, 2014
  69. World History

    Which option accurately describes the reason for Ferdinand Magellan’s exploration efforts? A. to be the first person to conquer the Incan Empire and establish Spanish colonies B. to be the first person to reach the Spice Islands by sailing west from

    asked on November 30, 2018
  70. Spanish

    Sra. do my answers look correct? Part I Los mandatos en contexto. Escoge el mandato apropiado. Pon atención al contexto para determinar si es un mandato formal o informal. 1. Sé que Ud. tiene hambre pero, ¡no _______________! A. lo come B. lo coma C.

    asked on May 29, 2014
  71. math/Probability

    what is the probability of rolling a sum that exceeds 4 with two dice

    asked on June 11, 2010
  72. Algebra Square Roots

    For which value of x should the following expression be further simplified? \sqrt{ 39x} a x = 2 b x = 6 c x = 10 d x = 11

    asked on February 2, 2017
  73. Spanish

    Sra do theses look correct? Part I ¿Por o Para? Complete each statement correctly by choosing either POR or PARA. 1. Sacar buenas notas en esta clase es muy importante _____ mí. para 2. El drama Spy Kids fue escrito _____ Robert Rodríguez. por 3.

    asked on May 15, 2014
  74. Chemistry

    The color of light emitted by a hot solid object depends on?

    asked on December 1, 2014
  75. improving it without changing its overall meaning

    Ever been assigned to work on a group project for class! Many students dread group projects: because one student typically does most of the work. Unfortunately for some, group work does not end when students leave school, many employers use teams to

    asked on September 26, 2011
  76. Spanish

    Hola Sra. Do these look ok? Part I Complete el párrafo por llenar los espacios en blanco con la forma correcta de los verbos entre paréntesis. ¡OJO ! No todos requieren el subjuntivo. Hoy martes estoy en el aeropuerto y tengo que pasar la aduana. El

    asked on March 20, 2015
  77. Math

    Translate this phrase into an algebraic expression. 49 decreased by twice Vanessa's savings Use the variable v to represent Vanessa's savings.

    asked on January 7, 2017
  78. English

    Which of the following sentences demonstrates a subject-verb-modifier pattern? A. Shelly served dinner after spending hours preparing a meal. B. Shelly, after spending hours preparing the meal, served dinner. C. After spending hours preparing the meal,

    asked on August 1, 2016
  79. Spanish

    Sra. do these look correct? Part I Entonces, complete el diálogo telefónico en una manera lógica utilizando oraciones completas en español. 1. Dígame. Hola. ¿Puedo hablar con el señor Costa? 2. ¿De parte de quién? De parte de Anna. 3. Lo siento,

    asked on October 10, 2014
  80. Spanish

    Sra. are my answers correct? Thank you! Part I ¿Subjuntivo, indicativo o infinitivo? Choose the correct verb form to complete each sentence. 1. Tengo miedo de que mi novio _____. A. mienta B. miente C. mentir B. miente 2. ¡Qué lástima que ese hombre no

    asked on April 30, 2014
  81. Spanish

    Sra. would you look over my answers please? Part I. El subjuntivo con expresiones hipotéticas: Complete las frases siguientes utilizando EL SUBJUNTIVO. Ejemplo: No completaré la tarea hasta que... estudie los verbos. My answers are after the ... on each

    asked on September 26, 2014
  82. Calculus

    Find the critical numbers of the function. h(t) = t3/4 − 5t1/4

    asked on January 28, 2014
  83. chemistry

    Methanol is manufactured by the below catalyzed reation using ZnO/Chromate. CO + 2H2 --> CH3OH deltaH -91kJ Does the amount of methanol increase, decrease, or remain the same when an equilibrium mixture of reactants and products is subjected to the

    asked on April 22, 2010
  84. Spanish

    Sra. Are these correct? Part I ¿Pretérito o imperfecto del subjuntivo? Llene los espacios en blanco con la forma del PRETÉRITO o el IMPERFECTO DEL SUBJUNTIVO como apropiado. 1. Les pedí a ellos que __________ la factura inmediatamente. pagaran 2.

    asked on December 10, 2014
  85. chemistry

    what is the experimental errors in determining the formula unit of zinc chloride?

    asked on June 25, 2011
  86. AP Chem

    A solution of hydrogen peroxide, H2O2, is titrated with a solution of potassium permanganate, KMnO4. It requires 51.7 mL of 0.145 M KMnO4 to titrate 20.0 g of the solution of hydrogen peroxide. What is the mass percentage of H2O2 in the solution? If you

    asked on November 3, 2008
  87. History

    Which of the following statements best describes the middle class during the Industrial Revolution?A. The middle class lived in tenements because they faced harsher economic problems. B. The middle class women did not do physical labor and instead they

    asked on February 5, 2018
  88. Calculus

    Find two numbers whose difference is 132 and whose product is a minimum.

    asked on January 28, 2014
  89. math

    Anyone please help me! Directions: Follow the instructions below to design a fair race for the new video game Animal Tracks. 1. Choose two animals with different speeds. You can choose from the chart that starts at the bottom of this page or do research to

    asked on May 14, 2016
  90. chemistry

    a 1.00 L aqueous solution contained 5.80 g of NaOH. what is the pH of the solution? Can someone help me out with the setup of this?

    asked on April 28, 2010
  91. chemistry

    Calculate the molar solubility of BaSO4 in a solution in which [H3O+] is 0.50 M. Ksp(BaSO4) = 1.1×10-10, Ka(HSO4-)=1.02×10-2

    asked on April 23, 2017
  92. Precalc

    okay sorry last two questions! I promise! The sun always illuminates half of the moon’s surface, except during a lunar eclipse. The illuminated portion of the moon visible from Earth varies as it revolves around Earth resulting in the phases of the moon.

    asked on August 5, 2011
  93. Spanish

    Hola Sra. Are these correct? La tercera persona plural de pretérito. Cambie las formas entre comillas al pretérito según el ejemplo. Ejemplo: No “han podido” sacar dinero de la máquina. No pudieron sacar dinero de la máquina. Esos dos turistas 1.

    asked on November 20, 2014
  94. Chemistry

    A sample of gas at 47 C and 1.03 atm occupies a volume of 2.20 L. What volume would this gas occupy at 107 C and 0.789 atm?

    asked on March 4, 2012
  95. Chemistry

    What will happen when 100 ml of diethyl ether are added to 100 ml of water and thoroughly mixed? a.) Water will form a separate layer on top of the ether layer. b.)The temperature of the mixture will significantly increase. c.)There will be a chemical

    asked on August 12, 2012
  96. Math

    The Maximum Garden Problem. A farmer has 230 ft of fence to enclose a rectangular garden. What is the largest garden area that can be enclosed with the 230 ft of fence?

    asked on December 20, 2009
  97. Science

    explain how a microclimate can affect crop production I need someone to explain this to me because i don't get it

    asked on April 7, 2014
  98. Spanish

    Are my answers correct? I had the most trouble with the accents in part II. Thank you. Part I Llene los espacios en blanco con la forma correcta del verbo en la forma del presente progresivo utilizando el verbo ESTAR con el gerundio. 1. Sé que vosotras no

    asked on April 2, 2014
  99. AP Chem

    Can someone please check these problems? 34. You fill a balloon with helium gas to a volume of 2.68 L at 23 degrees C and 789 mmHg. Now you release the balloon. What would be the volume of helium if its pressure changes to 632 mmHg but the temperature is

    asked on November 12, 2008
  100. Chemistry

    How much heat energy, in kilojoules, is required to convert 48.0g of ice at −18.0 ∘C to water at 25.0 ∘C ? Please show all steps. i don't know where to start

    asked on December 9, 2014


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