Questions and answers by visitors named Jessica


  1. Find the radius of a sphere with a volume of 972π cubic millimeters.

  2. What is the missing interval in the pattern for a major scale?

    W W H W __ W H A. W B. H C. rest D. W W

  3. A bicycle and its rider together have a mass of 80 kg. If the bicycle's speed is 6m/s, how much force is needed to bring it to a stop in 4 seconds

  4. Use the display of data to find the standard deviation.

    A bar graph titled Score with a horizontal axis labeled from 5 to 11 in increments of 1 and a vertical axis labeled Frequency from 0 to 12 in increments of 2 contains three vertical bars with labels

  5. A saturated solution of Na2SO4, with excess of the solid, is present at equilibrium with its vapor in a closed vessel. (a) How many phases and components are present? (b) What is the number of degrees of freedom o the system? Identify the independent

  6. What group was in the highest caste?

    A.dalits B.rulers and warriors C.priests D.landowners and merchants

  7. How many gram of sodium fluoride should be added to 100000 liter of drinking water containing 0.6 ppm of sodium fluoride to provide a recommended concentration of 1.75 ppm?

    Answer is 115 grams. I keep getting .115 g What am I doing wrong? Please help.

  8. Classify the possible combinations of signs for a reaction's ∆H and ∆S values by the resulting spontaneity.

    A) Spontaneous as written at all temperatures. B) Spontaneous in reverse at all temperatures. C) Spontaneous as written above a certain

  9. What is the net ionic equation for the neutralization of CHOOH with NaOH?

  10. The energy used to power one of the Apollo lunar missions was supplied by the following overall reaction:

    2N2H4 + (CH3)2N2H2 + 3N2O4 -> 6N2 + 2CO2 + 8H2O For the phase of the lunar module ascended from the surface of the moon, a total of 1200kg N2H4 was

  11. The title "another evening at the club" is close in meaning to "just another evening at the club" given the events of the story, what is the significance of this meaning?

    I need help explaining this. I have no idea how to word it

  12. Find z so that 5% of the area under the standard normal curve lies to the right of z.

    the answer according to the book is 1.645, anyone got any ideas on how to get this?

  13. A researcher put 10.0 moles of N2O into a 2-L container at some temperature where it decomposes according to the following: N2O = 2N2+ O2. At equilibrium 2.20 moles of N2O remain. Calculate the Kc for the reaction.


  15. I am doing the Factoring Quadratic Expressions Quiz, has anyone done it? I am really stuck on it.

  16. 1.Which event took place soon before The United States annexed Texas.

    A Sam Houston became president B Texas became a u.s. territory C James Polk became president D Texas wrote a new constitution 2.Which of the following images would be the best symbol of

  17. A rock is thrown straigh down from a height of 480 feet with an initial velocity of 16 feet per second. How long does it take to hit the ground and with what speed does it hit the ground?

  18. In a tennis match, a player wins a point by hitting the ball sharply to the ground on the opponent's side of the net.

    If the ball bounces upward from the ground with a speed of 17 m/s , and is caught by a fan in the stands with a speed of 12 m/s , how high

  19. Right triangle FHG is shown

    *The sine of angle F is 0.53 What is the cosine of angle H? Round the answer to the nearest hundredth

  20. (I just need 2 writer ideas)

    In the middle of the 19th century, political philosopher Alexis de Tocqueville claimed, "The inhabitants of the United States have...properly speaking, no literature." In other words, de Tocqueville believed that America’s

  21. Iron combines with oxygen and water from the air to form rust. If an iron nail were allowed to rust completely, one should find that the rust weighs:

    I know the answer is the rust should way more than the nail it came from but can someone explain why

  22. 8. The lateral area of a cone is 555πcm^2. The radius is 15.1 cm. What is the slant height to the nearest tenth of a centimeter?

    A. 36.8 cm B. 11.7 cm C. 83.8 cm*** D. 25.5 cm 10. What is the volume of the given prism? Round the answer to the nearest tenth

  23. An isosceles triangle has a vertical angle of 116 degrees and its base is 8cm long.calculate its height

  24. 1. Which of the following energy transformations best describes the operation of a solar powered battery charger?

    (a) electrical energy --> thermal energy --> kinetic energy (b) nuclear energy --> potential energy --> chemical energy (c) thermal energy -->

  25. 1. Which of the following events caused immigrants to migrate north after the civil war?

    -the passage of the homestead act****** -the emergence of industry in cities -advances in the printing industry - the completion of the transcontinental railroad 2.

  26. A triangle and trapezoid share a 15 inch base and a height of 10 inches. For what values of b is the area of the trapezoid less than twice the area of the triangle?

  27. Find the mass of barium metal (in grams) that must react with O2 to produce enough barium oxide to prepare 1.1 L of a 0.10 M solution of OH^ -.

  28. A segment with endpoints (3, -2) and (4, 2) is dilated to the image segment with endpoints (9, -6) and (12, 6). What is the scale factor for the dilation?

    3 2 6 **my choice 9 **i feel its this one too, im stuck

  29. Iodine-131 is a radioactive isotope. After 8.00 days, 50.2% of the sample remains. What is the half life of 131-I?

  30. 1. A boy pushes a car to slow it down while the car is rolling horizontally down the road. If the boy pushes backwards on the car with 10N of force as the car rolls forward 3.0m, the amount of work done by the boy is:

    a)-30 b)0 c)3.3 J d)30 N•m e)300J my

  31. Refer to the following equation: 4NH3 + 7O2= 4NO2 +6HO, How many moles of ammonia would be required to produce 11.9 mol of water?

    Can you please walk me through the steps on how to figure this problem?

  32. A 200g mass attached to a horizontal spring oscillates at a frequency of 2.0 Hz. At one instant, the mass is at x= 5.0cm and has v= -30cm/s.

    find amplitude

  33. (a) When 300.0 milliliters of a solution of 0.200 molar AgNO3 is mixed with 100.0 milliliters of a 0.0500 molar CaCl2 solution, what is the concentration of silver ion after the reaction has gone to completion?

    (b)Write the net cell reaction for a cell

  34. Calculate the energy of a photon of red light with a wavelength of 6.45 x 10-5 cm. h = 6.626 x 10^-34 Js c = 2.998 x 10^8m/s

    Thank you!

  35. A camper attaches a rope from the top of her tent, 4 feet above the ground, to give it more support. If the rope is 8 feet long, about how far will the stake need to be from the middle of her tent?

  36. A particle moves along line segments from the origin to the points (3, 0, 0), (3, 3, 1), (0, 3, 1), and back to the origin under the influence of the force field

    F(x, y, z) = z2i + 5xyj + 4y2k. I have tried multiple times to solve this problem but the

  37. What are some differences between the European and Taino (Native American) ways of life and cultures?

    Desperate for anything. I've been researching for hours but can't find ANYTHING.

  38. Jan and Nika ride their bikes. Jan rides 5 miles per hour for 1 hour then rides at ten miles per hour for 30 minutes.Nika rides at a constant 8 miles per hour. the tripss cover the ssme distance. Forr w many minutes does Nika ride ?

  39. How many grams of dry NH4Cl need to be added to 2.10L of a 0.600M solution of ammonia,NH3 , to prepare a buffer solution that has a pH of 9.00? Kb for ammonia is 1.8x10^-5.

    I just wanted to make sure I dd this write, can you please check my work? Thank

  40. Write a balanced chemical reaction to show the dissociation of solid magnesium chloride (MgCl2) in water, indicate states of the reactants and products

  41. A photocopying machine purchased new for $4500 loses $900 in value a each year.

    a. Find the book value of the machine after 18 months. b. When will the book value be $1200? Assume that each situation can be decribed as a linear equation HELP!!! I don't know

  42. A jet engine applies a force of 300 N horizontally to the right against a 50 kg rocket. The force of air friction 200 N. If the rocket is thrust horizontally 2.0 m, what is the kinetic energy gained by the rocket.

  43. Find the missing dimension of the cylinder. Round your answer to the nearest whole number. Volume = 10,000π in.3 diameter= 32in

  44. What number makes this equation true? 82- ___ -29=18. I have no idea what the answer is.

  45. Using only​ algebra, find a cubic function with the given zeros.

    -2, 3, -7 the polynomial function is: f(x)=x^3+ (BLANK) x^2-13x-42 i can't figure out what BLANK is Thank you!

  46. Solve for x. Express the answer in simplest form.

    1/7 = 3 over 4x - 1 1/7 is a fraction

  47. The selling prices of houses in a city during one year were normally ditributed with a mean of $259,000 and a standard deviation of $15,000. Which of the following is closest to the percentage of the homes that had a selling Price between $244,000 and

  48. Hypothesis: A prediction of what you think the results of the project will be. Write your hypothesis before you begin the experiment and, if the experiment has more than one part, you will need a hypothesis for each section. Remember to create an

  49. Two blocks of masses m1 = 2.00 kg and m2 = 3.70 kg are each released from rest at a height of h = 5.60 m on a frictionless track, as shown in the figure below, and undergo an elastic head-on collision. (Let the positive direction point to the right.

  50. Two forces are the only forces acting on a 7.8 kg object which moves with an accelera- tion of 4.5 m/s2 in the positive y direction. One of the forces acts in the positive x direc- tion and has a magnitude of 14 N.

    What is the magnitude of the other force

  51. a ball is thrown upward at a speed of 12 m/s. It will reach the top of its path in about:

    a) 0.6 sec b) 1.2 sec c) 1.8 sec d) 2.4 sec Please explain how you find the answer!!! I cannot figure it out

  52. Determine the quadratic equation whose solutions are: 3 and -2. Explain your solution

  53. The density of aluminum is 2.70g/cm3. If a cube of aluminum weighs 13.5 grams whatis the length of the edge of the cube. I need help with the formula to figure this one out.

  54. A 0.180 kg ball falls 2.5m. How much wordoes the force of gravity do on the ball?

    Do I multiply .180x2.5 to get .45J Thank you for your help

  55. I'm so confused!

    Al + O2 -> Al2O3 This is supposed to be a balanced equations but how did it go from 2 oxygens to 3?

  56. Determine if the following system of equations has no solutions, infinitely many solutions or exactly one solution.

    -x+5y= −x+5y= \,\,-7 −7 -3x+14y= −3x+14y= \,\,-18 −18

  57. A sample of propane, C3H8, contains 18.0 moles of carbon atoms. How many total moles of atoms does the sample contain?

  58. x is partly constant and partly varies with y.When y=5,x=19 and when y=10,x=34.

    (i) Find the relationship between x and y. (ii) Find x when y=7.

  59. A parking garage charges a base rate of 3.50 for up to 2 hours, and an hourly rate for each additional hours. The sign below gives the prices for up to 5 hours of parking.

    Parking rates: 2hrs. $3.50 3hrs. $9.00 4hrs. $14.50 5hrs. $20 Which linear equations

  60. change the verbs from the present tense to the present progressive

    Nosotros salimos de la escuela Answer: estamos saliendo

  61. Which ordered pair could be removed to make a function?

    {(1,3) (2,4) (3,4) (3,6) (5,10) (6,3)} A) (2,4) B) (3,4) C (1,3) D) (6,3)

  62. Just as no mechanical device can be 100% efficient, no heat engine can transfer 100% of its heat to a single object. Some of the heat energy must be wasted (released into the environment). We have a heat engine that produces 150 J of heat, does 40 J of

  63. A compressed air tank carried by scuba divers has a volume of 9.5 L and a pressure of 140 atm at 20∘C.

    If the gas was instead in a cylinder with a floating, massless, frictionless piston, what would the volume of the gas be (in liters) at STP? Express the

  64. if an ideal gas has a pressure 2.47 atm, a temperature 86.78C and has a volume of 23.83L how many moles are in the sample

  65. A skier of mass 110 kg travels down a frictionless ski trial. a.) If the top of the trail is a height 200m above the bottom, what is the work done by gravity on the skier? b.) Find the velocity of the skier when he reaches the bottom of the ski trail.

  66. If m and n are integers, which of the following must be an even integer?

    A. 2mn B. mn C. mn+2 d. mn-2 e. 3mn

  67. A total of 598 tickets were sold for the school play. They were either adult tickets or student tickets. There were 52 fewer student tickets sold than adult tickets. How many adult tickets were sold?

  68. Consider the reaction:

    M + 2HCl �¨ MCl2 + H2 When 0.85 mol of the metal, M, reacted with an aqueous HCl solution (the HCl is in excess), the temperature of the solution rose because the reaction produced 6795 J of heat. What is ∆H in kJ per mol of M for

  69. What is the funtion rule shown in the table

    n 3,4,5,6 y 2,1,0,-1

  70. Plane A leaves the airport. One hour later, Plane B leaves the same airport on the same course. It catches up to Plane A in 2.5 hours. The average speed of Plane B is 300km/h faster than Plane A. Find the speed of each plane.

  71. Even though they are good friends, what is one argument seen in the play "The Night Thoreau Spent in Jail" between Henry and Waldo?

  72. why do we use the limiting reactant data to calculate delta h?

    why might it be important to know delta h prior to running a reaction?

  73. Consider the following equilibrium system at 900°C:

    H20(g) + CO(g) <==> H2(g) + CO2(g) Initially 5.0 moles of H2O and 4.0 moles of CO were reacted. At equilibrium, it is found that 2.0 moles of H2 are present. How many moles of H2O remain in the mixture?

  74. BoxedNGone truck rentals calculates that its price function is p(x)=160-2x,where p is the price (in dollars) at which exactly x trucks will be rented per day. Find the number of trucks that BoxedNGone should rent and the price it should charge to maximize

  75. A student determines the iron (II) content of a solution by first precipitating it as iron (II) hydroxide, and then decomposing the hydroxide to iron (II) oxide by heating. How many grams of iron (II) oxide should the student obtain if her solution

  76. When two fair six-sided dice are rolled, there are 36 possible outcomes. Find the probability that either doubles are rolled or the sum of the two dice is 8.

  77. A 1.40 kg skateboard is coasting along the pavement at a speed of 5.5 m/s when a 0.800 kg cat drops from a tree vertically downward onto the skateboard. What is the speed of the skateboard-cat combination.

  78. Trini adds 10g of baking soda to 100g of vinegar. The mixture begins to bubble. When the bubbling stops, trini finds the mass of the resulting mixture. She determines its mass is 105g. Why has the mass changed?

    A. A gas has formed and left the mixture B.

  79. Earlier you determined that the proper ratio of packages of buns, packages of patties, and jars of pickles is 3:2:4. If you want to feed at least 540 people, but also maintain the proper ratio, what minimum number of packages of buns, packages of patties,

  80. A student sits on a rotating stool holding two 3.4-kg objects. When his arms are extended horizontally, the objects are 1.0 m from the axis of rotation and he rotates with an angular speed of 0.75 rad/s. The moment of inertia of the student plus stool is

  81. Five-eights of Jesse Black's inventory was destroyed by fire. He sold the remaining part, which was slightly damaged, for one-third of its value and received $1300.

    a)What was the value of the destroyed part of the inventory? b)What was the value of the

  82. As a salesperson, you are paid $50 per week plus $3 per sale. This week you want your pay to be at least $100. Write an inequality for the number of sales you need to make, and describe the solutions.

  83. The figure below shows two current carrying wires and the directions of the currents they carry. The wires carry the following currents: I1 = 7.1 A and I2 = 8.9 A. Wire 1 is at (0, 5.8) mm; wire 2 is at (15.1, 0) mm; point P is at (15.1, 5.8) mm. Wire 1 is

  84. ​ A 3-kg stone is dropped from a height of 100 m.  Find its kinetic and potential energies when it is 50 m from the ground.


  85. a developer wants to enclose a rectangular grassy lot that borders a city street for parking. If the developer has 336 feet of fencing and does not fence the side along the street, what is the largest area that can be enclosed and what are the dimensions

  86. Find a cofunction with the same value as sin 19 degrees

  87. where are the shoulders relative to these parts?

    1. throat (inferior) 2. hip (superior) 3. ears (inferior) 4. hands (superior) 5. eyes (inferior) will someone please take a look at my answers and tell my if i am right

  88. Find the average rate of change of f(x) 3x^2-4x from x=3 to x=6 .

    Simplify your answer as much as possible.

  89. Which of the following health care professionals has overall responsibility for the accuracy of the medical record?

    A. attending physician B. chief executive officer C. Registered health information technician D. Registered health information administrator

  90. "Happiness belongs to the self-sufficient." - Aristotle

    What does it mean? I don't get it...

  91. The function f(x)=(x+6)^2 is not one-to-one. Choose the largest possible domain containing the number 0 so that f(x) restricted to this domain is one-to-one.

    The largest possible domain is [-6,infinity) If the restriction function is written F, then inverse

  92. Separation scheme for isolating benzoic acid

    Could you please show me a separation scheme for isolating benzoic acid from a reaction mixture if mixing a Grignard reagent phenylmagnesium bromide with dry ice (CO2) in ether? Thanks!

  93. 50 ml of a solution of 50% dextrose is added to a liter of 0.45% NaCl with 2.5% dextrose to yield a solution with a final dextrose concentration of what percent

  94. What is the molarity of 250 mL of a solution that contains 12.5 g of dissolved zinc bromide, ZnBr2?

  95. Consider the quadratic function

    f(x) = x^2 + 12x + 40. Find the vertex.

  96. If 20 counters are the whole set, what fraction of the set is 16 counters?

  97. If a rule is (3x,y) and a scale factor of 4 is used to transform it , what will the new rule be???

    Show work

  98. what does mitosis mean?

  99. I am having trouble with the answer on these questions:

    1. ¿_________ un suplemento para la primera clase en nuestros viajes en el pasado? a. hizo b. habia c. haz d. haga 2. Quiero saber ________ dicen los viajeros del horario nuevo. the choices are a. a

  100. The fastest recorded pitch in Major League Baseball was thrown by Nolan Ryan in 1974. If this pitch were thrown horizontally, the ball would fall 0.809 m (2.65 ft) by the time it reached home plate, 18.3 m (60 ft) away. How fast was Ryan’s pitch? (See


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