Questions Asked on
September 27, 2015

  1. science

    when an electric current is passed through water during the process of electrolysis, two gases are formed. One gas has a boiling point of -183C degree and the other has a boiling point of -253C degree. Has a physical or chemical change occurred?

    asked by dragas
  2. physics

    the magnitude of vector A is 35 units and points in the direction 325 degrees counterclockwise from the positive X-axis. calculate the X and y components of the vector

    asked by nelson
  3. math

    can you please check my work. A scientist uses a submarine to study ocean life. She begins at sea level, which is at an elevation of 0 ft. she travels straight down at a speed of 3.5ft per second. she then travels directly up 30seconds at a speed of 2.2ft

    asked by sara7
  4. Health

    Which of the following secondary sex characteristics do not develop during the teen years? (1 point) development of breasts in girls development of body hair in boys development of ovaries in girls and testes in boys development of acne in boys 2. What is

    asked by Shalee ^~^
  5. science- physics

    A car is traveling at a steady 90 km/h in a 50 km/h zone. A police motorcycle takes off at the instant the car passes it, accelerating at a steady 7.3 m/s/s.How much time elapses before the motorcycle is moving as fast as the car? How far is the motorcycle

    asked by Laura
  6. Chemistry I - University Level

    Suppose 5.87 g of barium acetate is dissolved in 300. mL of a 71.0 m M aqueous solution of sodium chromate. calculate the final molarity of barium cation in the solution. You can assume the volume of the solution doesn't change when the barium acetate is

    asked by Jessica
  7. Physics

    A projectile is fired at 12.5 m/s at an angle of 53.1 with the horizontal from a point 75m above the ground. A) How long does it take to reach the ground? B)What max height does it reach? C) What horizontal distance does it travel before striking the

    asked by Kitty
  8. chemistry

    Write the net ionic equation for the following molecular equation. HNO3 is a strong electrolyte. NaNO2(aq) + HNO3(aq)--> NaNO3(aq) + HNO2(aq) HNO2 is a weak electrolyte.

    asked by Megan
  9. physics

    NASA launches a satellite into orbit at a height above the surface of the Earth equal to the Earth's mean radius. The mass of the satellite is 550 kg. (Assume the Earth's mass is 5.97 1024 kg and its radius is 6.38 106 m.) (a) How long does it take the

    asked by Kristen
  10. math

    Max Wholesaler borrowed $2,000 on a 10%, 120-day note. After 45 days, Max paid $700 on the note. Thirty days later, Max paid an additional $630. Use ordinary interest

    asked by bosco
  11. Economics

    Suppose the price elasticity of demand for a novel translated into English is perfectly inelastic. Assume the initial price of the novel is $24 and the quantity demanded is 222 copies per year. If the price of the novel increases by $3, then the quantity

    asked by Cole
  12. public speaking

    What type of visual aid is showing the actual thing being discussed? A. Photograph B. Graph C. Object D. Videotape

    asked by Anonymous
  13. physics

    if two forces 10N and 20N are inclined at angle 60degree to each other. Find the resultant force.

    asked by John
  14. Physics

    The figure below represents part of the performance data of a car owned by a proud physics student. (The horizontal axis is marked in increments of 1 s and the vertical axis is marked in increments of 10 m/s.) f (a) Calculate the total distance traveled by

    asked by Kaleem
  15. Tertiary

    if sinh x=tan y, show that x=In(secy+tany)

    asked by Rosco
  16. CHEMISTRY

    A 70.0 mL solution of 0.165 M potassium alaninate (H2NC2H5CO2K) is titrated with 0.165 M HCl. The pKa values for the amino acid alanine are 2.344 (pKa1) and 9.868 (pKa2), which correspond to the carboxylic acid and amino groups, respectively. Calculate pH

    asked by Owen
  17. Math

    bus A stops every 12 minuets Bus B stops every 9 minuets on the same circuit they stop at the same bus stop at 9:15 am when is the next time this will happen ??

    asked by Hannah
  18. design and logic

    A software company sells a package that retails for $99. Quantity discounts are given according to the following table: Quantity Discount 10-19 20% 20-49 30% 50-99 40% 100 or more 50%

    asked by max omoh
  19. Physics

    A mover has to move a heavy sofa of mass 146 kg to the second floor of the house. He uses a rope to pull the sofa up a ramp from the first to the second floor. As he pulls the sofa he makes sure that the rope is parallel to the surface of the ramp which is

    asked by Anna
  20. math

    a contractor's crew can frame 3 houses in a week. how long will it take them to frame 54 houses if they frame the same number each week?

    asked by henry
  21. Principles of Sociology

    Apply conflict theory to gentrification.

    asked by Dee365
  22. physics

    Shoes made for the sports of bouldering and rock climbing are designed to provide a great deal of friction between the foot and the surface of the ground. Such shoes on smooth rock might have a coefficient of static friction of 1.2 and a coefficient of

    asked by xxx
  23. Economics

    When XYZ firm entered the market for good two years back, it kept the price of its product low to attract customers away from its leading competitor. The firm has now established itself and has a market share of 20 percent. The management of XYZ is is

    asked by Cole
  24. Physics

    A uniform electric field exists everywhere in the x, y plane. This electric field has a magnitude of 5600 N/C and is directed in the positive x direction. A point charge -9.6 × 10-9 C is placed at the origin. Find the magnitude of the net electric field

    asked by Anonymous
  25. Physics

    A rifle bullet, traveling at "v1" strikes a large tree an penetrates to a depth of "d". the mass of the bullet is "m". assume the de-acceleration is constant as it penetrates the tree. a) the time required to stop. b) the de-acceleration of the bullet. c)

    asked by John
  26. Geometry

    A carpenter cut the top section of a window frame with a 37-degree angle on each end. the side pieces each have a 50 degree single cut at their top sides. Will the side pieces of the frame be ?

    asked by Steve
  27. Math

    Gisela has 135 cds 11 are pop music she has 3 times as many rocks cds as she had classical how many rocks cds does she have?

    asked by Anna
  28. Math

    when linda and martin work together painting one room, they can complete the work in 5 hours. when linda works alone it takes her 7 hours to paint the same room. how long would it take marvin to paint the room alone?

    asked by Cesar
  29. Math

    Confused on this 8log8(19)=

    asked by Adam
  30. Chemistry I - University

    Suppose 5.87 g of barium acetate is dissolved in 300. mL of a 71.0 m M aqueous solution of sodium chromate. calculate the final molarity of barium cation in the solution. You can assume the volume of the solution doesn't change when the barium acetate is

    asked by Jessica
  31. physics

    A quarterback takes the ball from the line of scrimmage, runs backwards for 9.0 yards, then runs sideways parallel to the line of scrimmage for 17.0 yards. At this point, he throws a 46.0-yard forward pass straight downfield, perpendicular to the line of

    asked by Anonymous
  32. AP Chemistry

    Consider the cell Pb(s)| PbSO4(s)| SO4(2-) (aq , 0.60 M)|| H+(aq , 0.70 M)| H2(g , 192.5 kPa)| Pt. If E◦ for the cell is 0.36 V at 25◦C, write the Nernst equation for the cell at this temperature. I do not understand this at all right now.

    asked by AllysonR99
  33. Science PLEASE HELP

    Could a mixture be made up of only elements and no compounds? Explain why or why not.

    asked by Katie
  34. Finance

    Dr. Mallory practices at your hospital and your competitor. Presented below are data for MS-DRG 470 (Major Joint and Limb Reattachments, Lower Extremity) that reflect practice patterns for Dr. Mallory at the two hospitals. What do you think accounts for

    asked by millicent
  35. Physics

    A basketball player shoots a free throw at a 50 degree angle. Assume the ball is released at a height of 1.8 meters, the hoop is 3 meters off of the floor and 4.6 meters away from the shooter. With what velocity should the player release the ball to hit

    asked by Taylor
  36. Science

    At a constant velocity, a 5kg bag of cement is pulled straight up a 7m wall. How much work is done by the puller? W(J)=F(N)*D(m) (Gravitational pull is 9.8m/s to the second power)

    asked by CeeJay
  37. math

    john and bryan share 1500 Rs.if john gets twice as much as bryan how much money does bryan have

    asked by haider
  38. physical science

    . You make the following measurements of an object: 22kg and 42m3. What would the object’s density be? Show your work for credit and include final units.

    asked by bee
  39. fundamentals math

    A standard math test was given to 6000 students. The scores were normally distributed with a mean of 420 and a standard deviation of 40. If george scored 340, how many students scored more than George? This is hrd because I tried using calculator but

    asked by Jacqueline
  40. physics

    a mass of 15kg was suspended from a ceiling is pulled aside with a horizontal force,F, calculate the value of tension, T. (g=10m/s)

    asked by prince
  41. Quick math help

    a set of data points has a correlation r= -0.86 your friend claims that because the correlation is close to -1 it is reasonable to use the line of best fit to make predictions is your friend correct explain your reasoning. I say she isn't correct because

    asked by Hanna
  42. chemistry

    how i can prepare 0.6M H3PO4(250ml).

    asked by mostafa
  43. Physics-Urgent

    A sign with a mass of 23 kg is hanging in two wires both making an angle of 27 degrees with the vertical. Find the tension in one of the wires. Give your answer in newtons (N) and with 3 significant figures.

    asked by Anonymous
  44. chem

    Potassium-40 undergoes three different modes of radioactive decay (Beta decay, Positron decay, and Electron Capture decay). Write balanced nuclear reactions for each of these decay modes. Are the products stable (not radioactive)?

    asked by Zak
  45. Math

    Three fifth of the members of a hiking trip club went on the last hiking trip. If 39 people went on the trip how many are in the club? Mathew travels two and one half miles to get to school. This is 3 times the distance that Jennifer travels . How far does

    asked by Sunny
  46. PE

    Which side of the health triangle corresponds to getting enough rest? physical health social health mental and emotional health**** none of the above

    asked by Stacy
  47. PE

    Lifestyle choices and health awareness affect your position on the health continuum. wellness scale. risk factor chart**. rating.

    asked by Stacy
  48. Chemistry

    The strontium-90 isotope decays by the reaction below. It has a half-life of 28 yr. If the initial activity of this isotope was 168dpm, what would the activity be after 28.0 yr?

    asked by Morgan
  49. accounts

    Ex 11.5 The year-end balance sheet of Jackson Products, INC., includes the following stockholders' equity section (with certain details ommited): Stockholders' equity: Capital stock: 7% cumulative preferred stock, $100 par value----$15,000,000 Common

    asked by Hotwani
  50. Math

    One eight-ounce glass of apple juice and one eight-ounce glass of orange juice contain a total of 180 milligrams of vitamin C. Four eight-ounce glasses of apple juice and three eight-ounce glasses of orange juice contain a total of 637.4 milligrams of

    asked by Kathy
  51. chemistry

    When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 14.4 g of carbon were burned in the presence of 55.2 g of oxygen, 16.8 g of oxygen remained unreacted. What mass of carbon dioxide was produced?

    asked by liz
  52. Washington lee

    A certain spring stretches 8.9 cm when it supports a mass of 0.89 kg . If the elastic limit is not reached, how far will it stretch when it supports a mass of 18 kg ?

    asked by Ana
  53. physics

    if a girl walks 30m northwards from point A-B and then 40m eastwards to point C.What is her total displacement and distance?

    asked by christain
  54. Health PLEASE HELP

    Hi, can some one check my health answers? I answered all the questions, I would just like some one to check them :) btw I go to connections academy. 1.Which of the following secondary sex characteristics do not develop during the teen years? (1 point)

    asked by KawaiiLightlee
  55. Chemistry - Radioactivity

    The activity of a sample of Ba-137m has decreased by 75% from its initial activity after 5.10 minutes. What is the half-life of Ba-137m? What fraction of activity remains after 6.25 minutes? (A=Aoe (-kt); k = .693/t1/2)

    asked by William
  56. Chemistry

    what is the mass percent of a solution made by dissolving 35.5 g. of NaCl in 500 g. of water?

    asked by Dillan
  57. Chemistry

    An atom of an element weighs 3.00x10^-23 g. What is the atomic mass of this element in atomi

    asked by Hailey
  58. Calculus

    Consider the line through the points (3,2,5) and (1,1,1). Consider the plane A that is perpendicular to this line, and passing through the point (-1,0,2). Consider the plane B that passes through the points (1,-1,0), (0,2,0), and (0,5,2). Consider the

    asked by Alexa
  59. maths

    . 30 girls and boys have planned for a picnic. There is a ratio of 3 girls to 7 boys. How many boys are there?

    asked by maths
  60. Math

    Pharmacy has 325mL of a 40% solution. 120mL of sterile water is added to this solution to decrease the concentration. How many grams of active ingredient would be in the diluted solution?(just need to know how to set this up please)

    asked by Rayne
  61. Chemistry

    I am doing an elementary experiment regarding separating mixtures. My mixture contained NaCl, SiO2, and CaCO3. In the beginning, I calculated the mass of my mixture (all components together). As I completed the experiment, some of the elements were lost

    asked by Michael
  62. Chemistry

    The strontium-87 isotopes stores in the body and decays by the process shown below. The half-life is 2.80hr. Suppose that 0.766 millicuries got into the body. How many mc will remain after 8.40 hr?

    asked by Morgan
  63. physics

    A man walks 30km east ward and 35km north ward what is the resultant displacement of the man,as well as his direction

    asked by chika nsitem
  64. math

    An item is on sale at 40% off the regular price. It is taxed at a rate of 6%. If the final sale price including tax is $57.24, then what is the sale price of the item without tax? What was the regular price of the item? The sale price of the item without

    asked by Anonymous
  65. Calculus

    Find y" by implicit differentiation. x^3+y^3 = 1 (x^3)'+(y^3)' = (1)' 3x^2+3y^2(y') = 0 3y^2(y') = -3x^2 y' = -3x^2/3y^2 y' = -x^2/y^2 y" = [(y^2)(-x^2)'-(-x^2)(y^2)']/y^4 y" = [(y^2)(-2x)-(-x^2)(2y)]/y^4 y" = [(-2xy^2)-(-2yx^2)]/y^4 y" = -2xy(y-x)/y^4 y"

    asked by Justin
  66. psychology

    Gavin, a seventh grader, has more trouble in school than many of his peers, particularly with word problems in math and other areas that aren't concrete and tangible. In spite of high motivation, he still struggles, and new situations and problems “throw

    asked by Anonymous
  67. math

    One month, ruby worked 6 hours more than Isac, and Svetlana worked 4 times as many hours as Ruby. Together they worked 126 hours. Find the number of hours each person worked

    asked by maleia
  68. math please help

    Marissa is designing a rectangular poster whose width is 2/3 of its height. Its perimeter will be 100 inches. what are the dimensions of the poster?

    asked by quel
  69. Physics

    In the figure below the left-hand cable has a tension T1 and makes an angle of 45 ◦ with the horizontal. The right-hand cable has a tension T3 and makes an angle of 48 ◦ with the horizontal. A W1 weight is on the left and a W2 weight is on the right.

    asked by Josh
  70. Math- Please help

    I'm in desperate need of help on how to do these 4 problems. Write the function g(x) with the indicated transformations. 1. f(x)=x; translated right 3 units 2. f(x)=x^2; vertical stretch by 5, translated down 3 units and reflected across the x-axis 3

    asked by Hannah
  71. college algebra

    A freight rain leaves a station and travels north at a constant rate of 60 mph. One hour later a passenger train leaves the same station traveling north on a parallel track at 80 mph. How long will it take for the passenger train to draw even with the

    asked by quel
  72. math

    Dan is cutting 4.75 foot legths of twine from a 240 foot spool of twine. He needs to cut 42 lengths, and says that 40.5 feet of twine will remain. Show that this is reasonable. THANK YOU!

    asked by kimie
  73. PE

    You discover a red bump on your leg that itches. You decide to research the symptoms. While researching, you discover contradictory information. What is the best next step? Assume the bump is life threatening and call the doctor.*** Implement the solution

    asked by Stacy
  74. math

    An item is on sale at 40% off the regular price. It is taxed at a rate of 6%. If the final sale price including tax is $57.24, then what is the sale price of the item without tax? What was the regular price of the item? The sale price of the item without

    asked by Anonymous
  75. college algebra

    Marissa is designing a rectangular poster whose width is 2/3 of its height. Its perimeter will be 100 inches. what are the dimensions of the poster?

    asked by quel
  76. Physics

    A fireman d = 33.0 m away from a burning building directs a stream of water from a ground-level fire hose at an angle of θi = 21.0° above the horizontal as shown in the figure. If the speed of the stream as it leaves the hose is vi = 40.0 m/s, at what

    asked by James
  77. Physics

    A basketball player shoots a free throw at a 50 degree angle. Assume the ball is released at a height of 1.8 meters, the hoop is 3 meters off of the floor and 4.6 meters away from the shooter. With what velocity should the player release the ball to hit

    asked by Taylor
  78. General CHEMESRY

    A chemist weighed out 84.9 of sodium. Calculate the number of moles of sodium she weighed out.

    asked by PLEASE HELP
  79. Math

    A stero was discounted by 20 % and sold at the discount price of $256 which of the following equals the price of the stereo before the discount

    asked by Mohammed
  80. physics

    a body is at equlibrium under the action of three forces.one force is 10n acting due east and one is 5n in the direction 60degree north east.what is the magnitude and direction of the third force.

    asked by mfoniso
  81. math

    An advertisement for a steel-belted radial tire states that this tire delivers 16% better gas mileage. If the present gas mileage is 24.5 mpg, what mileage would you expect if you purchased these tires? Round your answer to the nearest tenth of a mile per

    asked by Valerie
  82. shammah int'l school

    A man walks at 30km east ward and 35km north ward what is the resultant displacement of the man,as well as his direction

    asked by chika nsitem
  83. Math

    There is the mystery number between 337 and 400. This number has 2 digits that are the same. The sum of all the digits is 12. What is the mystery number?

    asked by Nath
  84. math

    Gregory is 2 years older than Esmeralda. In 5 years the sum of their ages will be 42. How old is Esmeralda now? (A) Translate the given information into an equation using the variable x = current age of Esmeralda. Simplify the left side of your equation.

    asked by Anonymous
  85. Chemistry

    Which one of the following is a diastereomer of (2R,3R)-2,3-dibromopentane? How do I got about this?

    asked by chemmy
  86. chemistry (Physchem)

    Calculate the standard heat of reaction at 250C (298K) and 1 atm pressure of 3FeO(s) + 2Al(s) → Al2O3(s) + 3Fe(s) in terms of per mole of Al2O3 formed, per mole of Fe formed, per mole of FeO reacted, per mole of Al reacted and per g of Fe formed.

    asked by Anna
  87. math

    can you please check my work. sorry to repost but I was skipped over earlier and just want to know if I did this correctly? A scientist uses a submarine to study ocean life. She begins at sea level, which is at an elevation of 0 ft. she travels straight

    asked by sara7
  88. Math

    PLEASE HELP ASAP!!! 1 rectangular prism has a base area of 120 square feet, a height of 12 feet per second and has dimensions of 84 inches, 6 feet, and 16 feet. Is the volume of the second more than or less than half that of the first? now explain

    asked by Kim
  89. Math

    The price of a television set on sale is $360. This is two third of the regular price. Find the regular price?

    asked by Sunny
  90. English

    Use myriad minutia nominal ponderous and vast in these sentences. Correct me if I'm wrong! 1. I am burdensome. (Ponderous?) 2. I am a great host. (Myriad?) 3. I am the least acceptable amount. (Nominal?) 4. I am the tiny details that are sometime easy to

    asked by Hanna
  91. science

    A system is a group of connected parts that work together as one to produce a particular result. Let’s say that you go to the Smoothie station and get a banana strawberry smoothie. Describe the main parts of this system- input, process, and output.

    asked by Helpppppppppppppppp Plzzzzzzzzzzz
  92. Physics

    Two charges are placed on the x axis. One of the charges (q1 = +5.44C) is at x1 = +3.00 cm and the other (q2 = -27.7C) is at x2 = +9.00 cm. Find the net electric field (magnitude and direction given as a plus or minus sign) at (a) x = 0 cm and (b) x =

    asked by Anonymous
  93. sociology

    How can the three sociological perspectives (e.g., social functionalism, social conflict, and symbolic interaction) be used to conceptually understand the family

    asked by Susie
  94. Social Studies

    What was a great contribution of the Islamic golden age? West African trading empires traded what commodities? Why did the Bantu-speaking people migrate? How did Kilwa and Aksum become powerful? How did the Inca keep records? What did the Maya farmers do

    asked by Animegirl
  95. Math

    You bought a total of four cans of chicken soup at the grocery store. You paid a total of $3.16 for all four cans. How much did each can cost?

    asked by Zoe
  96. Criminal Justice/Terrorism

    the general public needs to understand that if the U.S. becomes more serious about protecting its citizens from terrorists: A. taxes will be raised. B. we will be asked to give up our access to sensitive information. C. we will rely on federal agencies for

    asked by Pat
  97. Math

    Every 12th customer at a Chicago deli gets a free soda. Every 15th customer gets a free bagel. Which is the first customer to get a free bagel and free soda? Please help!!!

    asked by Keesha
  98. science

    a stone is falled from a tower of height of 500 m into a pond water. When did we hear the sound of the stone, contact with water from the tower. If velocity of sound is 340m/s and accelaration of gravity is 10 m/s2

    asked by biki
  99. Math

    500! is divisible by 21. How many times can 21 go into 500! ? The answer key does not simply state 500!/21 times, and my calculator does not have the capacity to compute such a large sum. Thanks!

    asked by Beth
  100. Math

    A salesperson's weekly paycheck is 25% less than a second salesperson's paycheck. The two paychecks total $1425. Find the amount of each paycheck. first salesperson's paycheck ? second salesperson's paycheck?

    asked by Kathy
  101. math

    The sum of the ages of Jose and Valerie is 78 years. 9 years ago, Jose's age was 3 times Valerie's age. How old is Jose now? (A) Translate the given information into an equation using the variable x = current age of Jose. Your equation should contain 78,

    asked by Anonymous
  102. Physics

    An automobile uniformly accelerates from rest at 15 ft/s2 for 6s. What is the fanal velocity in ft/s? v=d/t 15 *6= 90 90ft/s

    asked by RP
  103. College algebra

    Curt can be paid in one of two ways for the sales he generates: Plan A: 900$ per month plus 10% sales commission. Plan B: $1200 per month plus 15% commission on sales above $8,000. Assuming he always exceeds $8,000 in sales, for what amount interval of $

    asked by quel
  104. math

    The sum of the ages of Jose and Valerie is 78 years. 9 years ago, Jose's age was 3 times Valerie's age. How old is Jose now? (A) Translate the given information into an equation using the variable x = current age of Jose. Your equation should contain 78,

    asked by Anonymous
  105. precalc

    3- l2x-4l is less than or equal to 1 are the values of x x is greater than or equal to 3 x is less than or equal to -3

    asked by rebecca
  106. Programming

    The Parasol Insurance Group sells a variety of insurance policy types. Design a flowchart for a program that accepts a client’s name and “Y’ or “N’ string answers to questions about whether the client wants each of the following policy types:

    asked by Tim
  107. Pre-Algebra

    You are a member of a fund raising committee for your school. The committee is sponsoring a fair. Each member of the committee has agreed to sell 50 tickets to the fair. Student tickets are $3 each and adult tickets are $5 each. Use an expression to

    asked by Zoe
  108. Biology

    You find 3 trees where each tree gives a different coloured fruit: red, pink or orange. You perform crosses between all three trees and get the following results: P: red x pink ---F1: ½ red: ½ pink P: red x orange --- F1: ½ red: ½ orange P: pink x

    asked by James
  109. algebra

    solve the system by substitution x+y=9000 .06x+.15y=1215 .06x+.15(x-9000)=1215 .06x+.15x-1350=1215 .21x-1350=1215 x-1350+1214.79 x+2564.79 don't look right? where did I go wrong

    asked by john
  110. math

    A company makes two products , namely X and Y. Each product must be processed in 3 stages; welding , assembly and painting. Each unit X takes 2 hours in welding, assembling 3 hours and 1 hour in painting. Each unit Y takes 3 hours in welding, 2 hours

    asked by Iman
  111. Criminal Justice/Terrorism

    The best way to ensure success in the event of a terrorist attack is through: a. the use of the IMS because it can be expanded or contracted to include local, state, and federal agencies. b. adoption of the Critical Coordination Contract, whereby different

    asked by Pat
  112. French

    Are these sentences correct? Dimanche la semaine dernière, j'ai vu ma cousine. Dimanche 16, j'ai joué aux cartes.

    asked by Anonymous
  113. bio gr 11

    are sharks more related to amphibians or rodents? I feel as if its rodents because they both give live birth but im not sure cause based on my photogenic tree amphibians are underneath sharks

    asked by Lila
  114. Social Studies

    What was a great contribution of the Islamic golden age? West African trading empires traded what commodities? Why did the Bantu-speaking people migrate? How did Kilwa and Aksum become powerful? How did the Inca keep records? What did the Maya farmers do

    asked by Animegirl
  115. AP Physics

    A car enters the freeway with a speed of 6.9 m/s and accelerates uniformly for 2.7 km in 3,7 min. How fast is the car moving after this time? Answer in units of m/s.

    asked by Natasha
  116. integration need help

    integrate secxdx

    asked by collins
  117. science

    titanium reacts with oxygen a chemical change or a physical change

    asked by Krystal
  118. Chemisty

    What volume of 0.57 M HCl is needed to react with 5.6 g CaCO3?

    asked by Junior
  119. Physics

    How do I calculate the upper limit and lower limits in order to obtain F(max)and F(min)for the problem below. Using the force F = (1/2)CApv^2 on the car due to air friction. Consider a car with front cross-sectional area of A=(1.77 ± 0.02)m^2 and a drag

    asked by NONEE
  120. math

    Gregory is 2 years older than Esmeralda. In 5 years the sum of their ages will be 42. How old is Esmeralda now? (A) Translate the given information into an equation using the variable x = current age of Esmeralda. Simplify the left side of your equation. =

    asked by Anonymous
  121. Statistics (Central Limit Theorem)

    Does the central limit theorem apply to non-normally distributed variables? Why?

    asked by Zam
  122. Physics

    A concrete sidewalk is constructed between two buildings on a day when the temperature is 25 0C. The sidewalk is 6 m long and consists of two slabs each 3 m in length and of negligible thickness. What would be amount of buckling (displacement) upwards that

    asked by Pam
  123. Algebra I

    How would I find an absolute value inequality which x is less than or equal to 6 or x is greater than or equal to 10?

    asked by Mikey
  124. Math

    Bob was riding his dune buggy. Part of the time he was riding at 10 mph and the remainder of the time at 14 mph. The total distance traveled was 68 miles and it took him 5 hours. How much time was spent traveling at 10 mph?

    asked by Christina
  125. Quick English check

    Please correct me if I'm wrong! Canada, Denmark, Russia, Norway, and the USA are the five countries with territorial claims to the artic seabed. The EXTENSIVE (as compared to the other claimants) Denmark has already submitted its claim to be reviewed for

    asked by Hanna
  126. Organic Chemistry

    Are n-pentyl chloride and n-pentyl bromide miscible or immiscible? Why?

    asked by Sasha
  127. math

    A shopper uses a department store gift card to pay for 3 sweaters priced at $27 each. What integer can be used to show the amount of change?

    asked by Melanie
  128. Calculus

    Let u=f(r) and r=|x|=((x1)^2 +···|(xn)^2)^1/2. Show that􏰀 ∑ (∂u/∂xj)^2 = (f′(r))^2 Please help! it's an assignment due tomorrow

    asked by Sarah
  129. algebra

    The ratio of the tens digit to the units digit of a two digit number is 2:3. The number that results when the digits of the original number are reversed is 27 more than the original number. Find the original number.

    asked by lucy
  130. History

    Is Davy Jones real? Is Blackbeard real?

    asked by Christina Johnson Wong
  131. precalculus

    hello there! i wanted to check my answer. is: 2(x-y) / (radical x- radical y) = 2 radical x + 2 radical y? thanks so much for your help!

    asked by rebecca
  132. English

    I am doing an essay on why language is important in today's society. I have 2 main points so far: 1) it benefits an individual greatly 2) See things in a different perspective 3)?? I don't know what else, I am stuck on this for 2 hours. Please any advice?

    asked by Joe
  133. Social Studies

    What was a great contribution of the Islamic golden age?

    asked by Animegirl
  134. precalc

    i also need help with these two questions: 1/r=1/r1 +1/r2 solve for r1 and: f= G(mM/r^2); solve for m

    asked by rebecca
  135. french

    Write a composition in French about what you do everyday

    asked by louisa
  136. CHEMISTRY

    You have 875 mL of an 0.53 M acetic acid solution. What volume (V) of 1.30 M NaOH solution must you add in order to prepare an acetate buffer of pH = 4.94? (The pKa of acetic acid is 4.76.)

    asked by Owen
  137. Chemistry

    What mass of Pb(No3)2 would be required to yield 9g of 3PbCl2 on the addition of excess sodium chloride solution

    asked by Jossy
  138. Math

    Jay loaned Ray 18220 at interest rate of 5.2% for 175 days. How much will Ray pay Jay at the end of the 175 days?

    asked by Eve
  139. Physics

    To ward off oceanic invaders, a cannon is placed 10 meters from the water's edge, pointing out at sea. The cannon is capable of firing a projectile at a maximum velocity of 100m/s. a) what is the maximum firing range of the cannon? b)If the cannon was

    asked by :(
  140. Math

    The circumference of a rear wheel of a carriage is 50 inches more than a front wheel. If the rear wheel makes as many revolutions in going 200 feet as the front wheel in going 120 feet, find the length of the circumference of each wheel.

    asked by Sean
  141. Math

    Distribution of exam 2 scores is unimodal and symmetric with a mean of 78 and a standard deviation of 4.6 points. What exam score corresponds to z- score of -2.46

    asked by Julie
  142. Math

    How many 300mg clindamycin capsules are required to compound a prescription as follows "clindamycin 3%, propylene glycol 5%, isopropyl alcohol qs ad 360mL"? (again just need help to set this problem up)

    asked by Rayne
  143. Math

    In a bag of red and black jellybeans 136 are red jb and the remaining r black jb if 15% of the jellybeans in the bag are black whatis the total number of jelly beans in bag A) 151 B 175 C) 175 D 200 E 906

    asked by Mohammed
  144. physics

    The potential energy (in J) of a system in one dimension is given by:2 3 U(x) = 5 − x + 3x − 2xWhat is the work done in moving a particle in this potential from x = 1 m to x = 2 m? Whatis the force on a particle in this potentialat x = 1 m and x = 2 m?

    asked by freddy
  145. chemistry

    49.5(0.506-x)(0.253-x)=4x^2 How to make it in quadratic equation Please help with step by step. thank u so much

    asked by Bobby
  146. Calculus

    limit (x^2+y^2)/(x+y)^2 as (x,y)->(0,0) I don't know how to prove it doesn't exist. Please help!

    asked by Margo
  147. english

    30-day Money Back Guarantee Groom Co. electric shavers come with a 30-day money back guarantee. The only stipulation is that you use your new exclusively for 2 weeks to become accustomed with the product. If you are not satisfied, we will refund the amount

    asked by Joshua
  148. Precalculos

    Find quadratic function with points (0,5), (1,2) and (3,2). Graph the function

    asked by Jenny
  149. Math

    What is this equation in standard form 8y-16x=24

    asked by Minenhle mposula
  150. math

    A internet movie rental company has two different options for renting movies. Option A: pay a one-time $40 membership fee and then pay $1 for each movie rental. Option B: Do not become a member and pay $6 for each movie rental. 1. Write an expression to

    asked by Brandon
  151. maths

    if A and B are in ratio 3:4 and B and C in 12:13,then A and C will be

    asked by maths
  152. Math

    Write the quadratic equation in general form. (x − 5)2 = 5

    asked by Kathy
  153. maths

    If the price of one tin is £t, which of the expressions below represents how much it will cost Morris to buy five tins? 5(t – 1) 5t – 1 t – 5 5t – 5

    asked by ashley
  154. World History

    How has Imperialism affected and continues to affect Malaysia politically, economically, and socially?

    asked by Tess
  155. Geometry

    Given: r is perpendicular to s, t is perpendicular to s prove:r is parallel to t

    asked by Steve
  156. math

    Peter will apply to his favorite school . Requirement for admission to the school : 1. Indonesian languange score should not be less than 6 , 2. Mathematics score should not be less than 5 3. Score of Indonesian languange + score of mathematics should not

    asked by Iman
  157. Geography

    I'm trying to solve for y (4y+2) = 2(3y-25) I've gotten as far as y= -26 but i needed to figure out how to make the answer positive

    asked by Julian
  158. Geometry

    I'm trying to solve for y (4y+2) = 2(3y-25) I've gotten as far as y= -26 but i needed to figure out how to make the answer positive

    asked by Julian
  159. Cryptography

    I have to find the deciphering multiplier for a multiplication cipher given, Cq=Pi so q goes to i / 17 goes to 9 I plugged it into the equation 17a = 9(mod 26) then solved using the inverse of 17 to reduce so 23 (17)a = 23 (9)(mod 26) this left me with

    asked by Victoria
  160. Calculus

    Let u=f(r) and r=|x|=(x1^2 +···|xn^2)^1/2. Show that􏰀 ∑ 1 to n (∂u/∂xj)^2 = (f′(r))^2

    asked by Martha
  161. Math

    x/(x+1) - 2/(x-1)= 1 I have been trying to solve it but I do not know the steps to solve it.

    asked by Jose
  162. Math

    5+5-5(5)/5

    asked by Farxaan
  163. math

    How many milligrams of a drug are in 500 g of a 25% Ointment?

    asked by Eleanor
  164. biology

    What does a chameleon do for the environment?

    asked by anon
  165. Quick English check

    Please correct me if I'm wrong! The VAST area of the artic seabed may have fossil fuel resources, but the costs to claim them are currently prohibitive. But that does not keep news organizations from INTIMATING that Russia is attempting a land grab. The

    asked by Hanna
  166. Chemistry

    An undergraduate student weighed 20g of sodium carbonate salt. If Na=23, O=16, carbon = 12and H=1, what is the mole of the hydroxide?

    asked by Gbadeola Ayodeji
  167. Physics, math

    What is the answer to this? I don't understand how to solve it. 1.2 = 4.6 tan 50 - 4.9 (4.6^2)/(x^2 cos^2 50)

    asked by Taylor
  168. math

    I need help with this problem: 33 1/3 of what number is 4 5/6

    asked by billy
  169. Algebra II

    Hi, can someone please explain how to graph piece wise functions to me? I am extremely confused. Ex.: -x+3, if x

    asked by Alex
  170. reading

    30-day Money Back Guarantee Groom Co. electric shavers come with a 30-day money back guarantee. The only stipulation is that you use your new exclusively for 2 weeks to become accustomed with the product. If you are not satisfied, we will refund the amount

    asked by Joshua
  171. Stats

    estimate the probability that a patient has health insurance, if 59% of Americans have private insurance and 25% have government insurance. Estimate the probability that it is private insurance Is this P(A and B) = P(A) x P(B)

    asked by Christina
  172. MATH

    how do you factor: a^3-b^6 ??? please help!

    asked by Diana
  173. pre-calc

    how do you factor 3x^-1/2 + 4x^1/2 + x^3/2?

    asked by Diana
  174. Science

    Could a mixture be made up of only elements and no compounds? Explain why or why not.

    asked by Katie
  175. Math

    -0.52(z)=-0.13 What does z =?

    asked by Zoe
  176. math

    there are 3 times as many boys as girls. if there are 24 more boys than girls.how many are there altogether

    asked by kian
  177. Chemistry

    100mls of propane gas in grams. Pressure is equal to one atmosphere

    asked by Anonymous
  178. Math

    4y + 8 = 6y + 3 True false or open My choice: False the expressions are never the same

    asked by Appreciated Help
  179. Chemistry

    Water drips from a faucet into a flask at the rate of two drops every 3 seconds. A millimeter of water is 20 drops. What volume of water, in liters, will be collected in 2.5 hours?

    asked by Gabrielle
  180. Science

    Does Chewbacca have a human like wiener or is it one of those red rocket type deals? George Lucas won't answer my emails.

    asked by Adam