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

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

    asked on November 12, 2015
  3. 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
  4. 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
  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. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. math

    find how many six-digit numbers can be formed from the digits 2,3,4,5,6,7 (with repetitions) if a) numbers formed must be even b) the numbers formed must be divisble by 25 c) the odd digits must occupy even position (2nd, 4th, 6th) and the even digits must

    asked on April 27, 2019
  14. 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

    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
  16. 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
  17. 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
  18. 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
  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. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. math

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

    asked on December 30, 2011
  26. 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
  27. 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
  28. 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
  29. 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
  30. Calculus

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

    asked on December 8, 2010
  31. 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
  32. Math

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

    asked on October 6, 2015
  33. 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
  34. 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
  35. physics

    Calculate the work and power done when a track athlete lifts a 20 kg barbell 0.6 meters in 0.8 seconds.

    asked on April 19, 2020
  36. 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
  37. 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
  38. 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
  39. 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
  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. 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
  42. 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
  43. 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
  44. 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
  45. 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
  46. 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
  47. 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
  48. 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
  49. 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
  50. 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
  51. 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
  52. 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
  53. 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
  54. 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
  55. 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
  56. 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 same

    asked on November 20, 2015
  57. Chemistry

    HA and HB are two strong monobasic acids. 25.0cm3 of 6.0moldm–3 HA is mixed with 45.0cm3 of 3.0moldm–3 HB. What is the H+(aq) concentration, in mol dm–3, in the resulting solution? A 1.9 B 2.1 C 4.1 D 4.5 could you please explain how you reach an

    asked on May 18, 2019
  58. Math please help urgent!!

    2. If m

    asked on February 18, 2016
  59. 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
  60. Calculus

    The table of values below shows the rate of water consumption in gallons per hour at selected time intervals from t = 0 to t = 12. Using a Trapezoidal sum with 5 subintervals, estimate the total amount of water consumed in that time interval. x 0 2 5 7 11

    asked on May 14, 2019
  61. Chemistry

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

    asked on December 1, 2014
  62. Math

    Mai has a piece of cloth that is 8.35 meters long. How many 15 centimeter pieces can she cut from the cloth? How much will be left over?

    asked on April 29, 2016
  63. Cultural Anthropology

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

    asked on March 18, 2013
  64. 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
  65. Calculus

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

    asked on January 28, 2014
  66. Geography

    a majority of the greenhouse gas emissions released into the atmosphere is composed of methane*** carbon dioxide oxygen nitrous oxide (my second guess)

    asked on May 16, 2016
  67. 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
  68. 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
  69. math/Probability

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

    asked on June 11, 2010
  70. History

    Which identify positive effects of New Imperialism? (Select all that apply.) introduction of medical vaccines enforcement of the abolition of slavery decline of indigenous beliefs and practices adoption of European styles of clothing C,D?

    asked on August 3, 2018
  71. 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
  72. 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
  73. history

    Which mostaccurately identifies a main difference between the revolutions led by Lenin and Gandhi? Lenin wanted to establish a Communist state, while Gandhi sought independence for India. Lenin wanted to establish a Communist state, while Gandhi fought to

    asked on August 5, 2018
  74. 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
  75. 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
  76. 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
  77. 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
  78. 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
  79. 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
  80. 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

    A salesperson contacts eight potential customers per day. From past experience, we know that the probability of a potential customer making a purchase is .05. b.) What is the probability the salesperson will make exactly two sales in a day? this is what I

    asked on October 9, 2015
  82. geometry

    The force of gravity pulling on an object down a hill is its weight multiplied by the sine of the angle of elevation of the hill. With how many pounds of force is gravity pulling on a 3000 lb car on a hill will a 3 degree angle of elevation? What i did:

    asked on March 12, 2008
  83. Math 105

    Suppose you are looking to buy a $10,000 face value 13-week T-bill. If you want to earn at least 3% annual interest, what is the most you should pay for the bill? Round your answer to the nearest penny.

    asked on July 2, 2016
  84. science

    identify the process that represents how organisms grow and replace old or damaged cells. Identify the process that is necessary for sexual reproduction, explain why it is necessary, and identify how this process increases genetic variation. (Hint: Answer

    asked on December 19, 2018
  85. 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
  86. Math

    Which expression is the same as 6 times 52? A) 2(50 + 6) B) 6(50 + 2) C) 6(5 + 2) D) 50(6 + 2)

    asked on March 20, 2019
  87. 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
  88. Calculus

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

    asked on January 28, 2014
  89. 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
  90. Math7 grade

    Wallpaper was applied to one rectangular wall of the photographer s studio. .The dimension of the wall are shown below 42 ft by 25.5 feet .If the total cost of the wallpaper was &771.21, what was the cost of the wallpaper per square foot.

    asked on October 22, 2016
  91. AP Chem

    A 3.50 g sample of KCl is dissolved in 10.0 mL of water. The resulting solution is then added to 60.0 mL of a 0.500 M CaCl2(aq) solution. Assuming that the volumes are additive, calculate the concentrations of each ion present in the final solution.

    asked on November 3, 2008
  92. probability math

    you have a set of 10 cards numbered 1 to 10. You choose a card at random. event A is choosing a number less than 4. Event B is choosing an even number. Calculate the probability of A.

    asked on May 18, 2017
  93. Chemistry

    What mass of salt(NaCl)should you add to 1.20 L of water in an ice cream maker to make a solution that freezes at -10.4∘C?

    asked on February 8, 2017
  94. 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
  95. 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
  96. 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
  97. 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
  98. Math

    The distance between Mountain View and crown top is 6.5 inches on a map if the scale on the map is 1 inch equals 25 miles what is the actual distance between the two towns 831.5 miles be 16.5 miles see 162.5 miles D 1 165 miles

    asked on January 28, 2019
  99. Calculus

    What is the linearization of f(x)=e^x at x=1?

    asked on December 7, 2010
  100. science

    A wolf us chasing a rabbit.Graph the wolf's motion using the following data: 15 m\s at 0 s,10 m\s at 3 s,1 m\s at 4 s,and 0 m\s at 5 s.What does the graph tell you???

    asked on December 1, 2012


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