Most popular questions and responses by anna
  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. math

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

    asked on December 30, 2011
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. Calculus

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

    asked on December 8, 2010
  19. 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
  20. Math please help urgent!!

    2. If m

    asked on February 18, 2016
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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

    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
  27. 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
  28. 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
  29. 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
  30. 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
  31. 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
  32. 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
  33. 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
  34. chemistry

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

    asked on November 12, 2015
  35. 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
  36. 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
  37. 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
  38. 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
  39. 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
  40. 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
  41. Cultural Anthropology

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

    asked on March 18, 2013
  42. 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
  43. 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
  44. Math

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

    asked on October 6, 2015
  45. Chemistry

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

    asked on December 1, 2014
  46. Please help with Physics Quickly

    1. How are impulse and momentum related? (Points : 1) Impulse is the change in momentum of an object. Momentum is the change in impulse acting on an object. Impulse and momentum are always equal in magnitude. Impulse and momentum are the same thing.

    asked on January 27, 2014
  47. 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
  48. 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
  49. 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
  50. 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
  51. 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
  52. 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
  53. 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
  54. Algebra

    When mushrooms are dried, they lose 80 percent of their mass. What weight of mushrooms must be picked to get 1 kg of dry mushrooms?

    asked on February 13, 2017
  55. math/Probability

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

    asked on June 11, 2010
  56. 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
  57. Chemistry

    Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.250 M phosphoric acid solution. [H3PO4] = ? [H2PO4^-] =? [HPO4^2-]=? [PO4^3-]=?

    asked on March 5, 2015
  58. 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
  59. 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
  60. Calculus

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

    asked on January 28, 2014
  61. Calculus

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

    asked on January 28, 2014
  62. 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
  63. 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
  64. 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
  65. Chemistry

    For which of these elements would the first ionization energy of the atom be higher than that of the diatomic molecule? helium oxygen carbon lithium Please explain why and thanks

    asked on December 2, 2014
  66. 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

    If one added 130 mL of 2 M NaOH to 1 L of a buffer composed of 2.3 M NH3 and 3.2 M NH4Cl, what would be the pH of the resulting solution? The Kb of NH3 is 1.8 × 10−5.

    asked on May 17, 2011
  68. 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
  69. 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
  70. science

    What are the most important events in the history of animal life that occurred at the beginning and at the end of the paleozoic

    asked on January 18, 2018
  71. 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
  72. science 6th grade

    1.the nose diaphragm and lungs are part of the_________system circulatory excretory nervous respiratory(my answer)

    asked on April 25, 2016
  73. 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
  74. History

    please help i have my answers just not sure if im correct :( what criticism did tillman direct at conservations? a.)they controlled the office of the govnr b.)they didn't think blacks should vote ****** c.)they believed in white supremacy d.)they didn't

    asked on March 24, 2015
  75. 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
  76. 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
  77. 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
  78. 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
  79. History

    Which were characteristics of the Ottoman Empire? (Select all that apply.) It controlled much of central Europe. Its capital was Moscow. It was multinational. Its rulers were Islamic leaders. A, C, D?

    asked on August 4, 2018
  80. liviing environment

    Transplanting genetic material into bacteria is a a simple task?

    asked on March 12, 2012
  81. 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
  82. 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
  83. 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
  84. 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
  85. AP Chem

    Would someone please check these for me? 52. In an experiment, you fill a heavy-walled 5.00-L flask with methane gas, CH4. If the flask contains 7.13 g of methane at 19 degrees C, what is the gas pressure? 2.14 atm 56. A 2.50-L flask was used to collect a

    asked on November 19, 2008
  86. chemistry

    Aniline (MW93 g/mol) co-distills with water 98.2 C. The vapor pressure of water at 98.2 C is 717 mmHg. You need to isolate 10 g of aniline. What is the minimum volume of water required to isolate 10 g of aniline in a steam distillation at 760 mmHg?

    asked on November 2, 2014
  87. math

    One store sells milk for $3.00 per gallon. A second store sells milk for $0.80 per quart.If you need two gallons, which store should you buy from?

    asked on March 9, 2017
  88. Physics

    The 3.80 kg cube in Fig. 15-45 has edge lengths d = 5.50 cm and is mounted on an axle through its center. A spring (k = 1300 N/m) connects the cube's upper corner to a rigid wall. Initially the spring is at its rest length. If the cube is rotated 2.00°

    asked on March 16, 2012
  89. Physics-Gravity

    A orbiting satellite stays over a certain spot on the equator of (rotating) Pluto. What is the altitude of the orbit (called a "synchronous orbit")? Do I use T^2=4pi^2/GM x r^3?

    asked on July 17, 2010
  90. maths

    A car travels 40 miles per gallon of petrol. How many kilometres can it travel on 5 gallons of petrol? (From a KS2 CGP SATs question book). The solution in the book says 40/5 = 8 8x8=64 64x 5 = 320Km I get the 64x5 =320Km, but not the first bit. Can anyone

    asked on March 20, 2016
  91. 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
  92. 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
  93. 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
  94. math

    Lee built a scale model of his car. The model was 3 inches long. The scale from the model to Lee’s car was 1 to 60. What was the length of Lee’s car? A 20 inches B 57 inches C 63 inches D 180 inches I don't get it please help

    asked on December 19, 2018
  95. Spanish

    In Columbia, _______. A. Children are not required to go to school B. Children are required to go to school until they are about 9 C. Children are required to go to school until they are about 14** D. Children are required to go to school until they are

    asked on October 6, 2016
  96. 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
  97. 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
  98. study skills

    what is the persistence triangle? This website discusses a persistance triangle and shows a clear diagram of it. Thank you for using the Jiskha Homework Help Forum. Here is a pdf file to download that will tell

    asked on August 12, 2007
  99. math, algebra

    Members at a yoga school pay $7 per class plus a one-time $120 membership fee. Non-members pay $11 per class. How many classes would a member have to take to save money compared to taking classes as a non-member? I'm struggling with this problem a bit, and

    asked on December 28, 2016
  100. 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


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