Most popular questions and responses by Courtney
  1. math 5th

    Estimate the area of the circle and use 22/7 for pie. Teh circle shows line all the way accross measruing 28cm. Find area. Can some one explain how

    asked on April 24, 2013
  2. English

    What grammatical structure is the italicized portion of the sentence? 1. (Headed by a senior), the group drew up rules for School Spirit Week. - nominative absolute 2. My most valuable coin, (one from Spain), is worth more than $100.00. - prepositional

    asked on November 4, 2012
  3. Chemistry

    Many metals react with oxygen gas to form the metal oxide. For example calcium reacts: 2Ca(s) + O2(g)--> 2CaO(s) Calculate the mass of calcium prepared from 4,20g of Ca and 2.80g of O2. (a) How many moles of CaO can form from the given mass of Ca? (b) How

    asked on September 28, 2009

    In what areas of North Africa do the majority of the people live and why? I know that they live by the Nile river but why is what don't know plz help I have been doing everything only come here if it's important plz help thank you

    asked on October 6, 2016
  5. Speech

    Group communication should be evaluated according to which of the following characteristics? a. Do the group members attain their individual goals? b. Do all members participate in the decision-making process? c. Does the group leader encourage

    asked on April 20, 2011
  6. Science

    Explain how sexual reproduction increases genetic diversity in many species of plants and animals, make sure to include the importance and function of gametes. PLEASE HELP!!

    asked on October 19, 2017
  7. physics

    a 95-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is: (A) accelerating upward with an acceleration of 1.8 m/s^2 (answer 1.1 * 10^3 N) (B) moving upward at a constant speed (answer 931 N) (C) accelerating

    asked on January 31, 2014

    How did European affect Africa during the 18 hundreds how did Africa Africans respond in the 1900 Plzzzzzz help I swear I have read my text read a link about but I still don't understand plz help!!!!!#

    asked on October 6, 2016
  9. Chemistry

    A solution contains an unknown amount of dissolved magnesium. Addition of 3.38×10−2mol of Na2CO3 causes complete precipitation of all of the magnesium. What mass of magnesium was dissolved in this solution?

    asked on October 3, 2013
  10. Language art

    Consider the main characters from " The Stolen Day and the night the bed fell in a paragraph discuss which character learns the most and which one learns the least. PLZ ANSWER ASAP and yes I have read both stories

    asked on October 6, 2016
  11. Chemistry

    1.62 g of CoCl2 x (xH20) were heated. After heating only .88g of CoCl2 remained. What was the formula of the original hydrate?

    asked on April 5, 2011
  12. Math ASAP ASAP!!!!!

    Earl earns a weekly salary of $150 plus 20% of amount of his sales for the week. Last week he earned $230. The equation below can be used to find "s" the amount of his sales in dollars last week 230=150+0.2s What was the amount of Earl's sales last week?

    asked on January 15, 2016
  13. College Chemistry

    the acid dissociation constant for acetic acid is 1.85x10^-5. Calculate the pH at the equivalent point and the pH at one-half the equivalence point for the titration of 25.00 mL of 0.100 M acetic acid with 0.100 M NaOH?

    asked on October 18, 2015
  14. World Geography

    Which statements describe the geographic theme of regions? a. Different types of regions have little or no effect upon each other. b. Climate regions are defined by their average temperature and their political system. c. Physical regions can be formed by

    asked on September 16, 2010

    Henry's current age is 10 times Justin's current age. in 6 years,Henry's age will be 4 times Justin's age. Which system of equations can be used to calculate H Henry's current age J Justin's current age? A. J=10h j+6=4(H+6) B.J=H+6 J+4=H+10 C.H=10J

    asked on January 15, 2016
  16. Physics

    Suppose at one point along the Nile River a ferryboat must travel straight across a 1.29-mile stretch from west to east. At this location, the river flows from south to north with a speed of 2.58 m/s. The ferryboat has a motor that can move the boat

    asked on February 4, 2016
  17. physics

    a boat has a mass of 6800 kg. its engine generate a drive force of 4100 N, due west, while the wind exerts a force of 8000 N, due east, and the water exerts a resistive force of 1200 N due east. what is the magnitude and direction of the boats

    asked on January 31, 2014
  18. Science

    How can volcanic eruptions change the surface of the earth? by creating large deposits of coal by creating new islands and land by lowering land levels several feet by decreasing the level of the ocean I think its C

    asked on December 26, 2015
  19. earth

    3. Show how the length of day changes with latitude by plotting the following points. Use the table below as a graph and place an X in the box where you want to plot a data point. For example, if you find that a day is 10 hours long at 30° N latitude,

    asked on March 26, 2012
  20. Speech

    After analyzing a problem, what is the next step in the problem-solving process? a. Develop creative solutions. b. Identify possible solutions. c. Select a solution. d. Implement a solution. I think it might be B

    asked on April 26, 2011
  21. Math

    what angle in radians corresponds to 3 rotations around the unit circle

    asked on February 18, 2014
  22. physics

    a 15-g bullet is fired from a rifle. it takes 2.50 * 10^-3s for the bullet to travel the length of the barrel, and it exits the barrel with a speed of 715 m/s. assuming that the acceleration of the bullet is constant, find the average net force exerted on

    asked on January 31, 2014
  23. calculus

    Find the number b such that the line y = b divides the region bounded by the curves y = 16x2 and y = 9 into two regions with equal area. (Round your answer to two decimal places.)

    asked on November 9, 2011
  24. geometry

    the measure of one interior angle of a parallelogram is 50 degrees more than 4 times the measure of another angle. find the measure of each angle.

    asked on February 9, 2017
  25. Chemm

    A 2.00L flask is filled with propane gas(C3H8)at 1.00atm and 15C. What is the mass of propane in the flask?

    asked on April 6, 2010
  26. Math/Physics

    Lil decides to estimate the height of the Empire State Building. She measures the angle θ of elevation of the spire atop the building as 19°. After walking x = 9.10 ✕ 102 ft closer to the building, she finds the angle to be 23.8°. Use Lil's data to

    asked on January 13, 2016
  27. Physics

    The angular speed of a propeller on a boat increases with constant acceleration from 11 rad/s to 26 rad/s in 2.4 seconds. Through what angle did the propeller turn during this time?

    asked on November 16, 2010
  28. Pre-Cal

    A Ferris wheel is 40 meters in diameter and boarded from a platform that is 5 meters above the ground. The six o'clock position on the Ferris wheel is level with the loading platform. The wheel completes one full revolution every 7 minutes. You make two

    asked on February 14, 2014
  29. Chemisrty

    Chlorine gas can be produced in the laboratory by adding concentrated hydrochloric acid to manganese(IV) oxide in the following reaction.. MnO2(s)+ 4HCl(aq)-->MnCl2(aq)+ 2H2O(l)+ Cl2(g) A. Calculate the mass of MnO2 needed to produce 25.0g of Cl2 B. What

    asked on April 12, 2010
  30. Math

    A box contains some white balls and some blue balls. There are 5 more blue balls than white balls. One ball is removed at random and not replaced. A second ball is then removed at random. The probability that the balls are different colours is 52/105. Find

    asked on November 10, 2016
  31. chemistry

    Find the solubility of AgBr in 3.9 M NH3 [Ksp of AgBr = 5.0 10-13 and Kf of Ag(NH3)2+ = 1.7 107]

    asked on November 4, 2011
  32. Pre-Calculus

    A rectangular garden with an area of 250 square meters is to be located next to a building and fenced on three sides, with the building acting as a fence on the fourth side. Let x be the length of the side parallel to the building. 1. Find T(x), the total

    asked on January 18, 2008
  33. history

    What is the correct definition of indigenous? native to a certain area or region applying to people of low social standing following a migratory pattern originating from India

    asked on November 6, 2018
  34. language

    A poem's underlying message or concept _____. 1 poetic diction 2 tone 3 atmosphere 4 all of these 5 none of these I think its the tone? Is this right?

    asked on June 2, 2010
  35. World Geography

    Which of these statments describe NATO? 1. NATO's preferred method for resolving conflict is through military defense. 2. NATO's original purpose was to defend its members from Soviet aggression. 3. NATO's members include the U.S. and Canada. 4. NATO was

    asked on March 25, 2011
  36. novel

    After the death of Curly in The Call of the Wild, Buck concludes that no fair play exists in his world and that he will never go down in a fight. The theme illustrated here is apparently derived from London's interpretation of

    asked on November 18, 2008

    Calculate the pressure on the top lid of a chest buried under 4.30 meters of mud with density 1.75X 10^3 kg/m^3 at the bottom of a 12.5 m deep lake

    asked on October 29, 2014
  38. Math 7th grade

    Write a mixed number for each time period. Be sure each fraction is in lowest terms. 8:00am to 9:20 am Not sure how to set up

    asked on September 4, 2013
  39. Physics

    A 55-kg soccer player jumps vertically upwards and heads the 0.45-kg ball as it is descending vertically with a speed of 29 m/s. If the ball is in contact with the player's head for 16 ms, what is the average acceleration of the ball? (Note that the force

    asked on October 3, 2014
  40. history help

    12. __________ and _________ first attracted settlers to the West.

    asked on November 18, 2014
  41. College Algebra

    A truck driver traveled at an average speed of 55 miles per hour on a 200 mile trip to pick up a load of freight. On the return trip(with the truck fully loaded), the average speed was 40miles per hour. What was the average speed for the round trip?

    asked on November 19, 2007
  42. English

    Read the lines from Shelley's "Ode to the West Wind." O thou Who chariotest to their dark wintry bed The winged seeds, where they lie cold and low, Each like a corpse within its grave, Which best explains the metaphor in these lines? 1.The wind is compared

    asked on June 3, 2010
  43. english

    Read the lines from Wordsworth's "Tintern Abbey." The sounding cataract Haunted me like a passion: the tall rock, The mountain, and the deep and gloomy wood, Their colours and their forms, were then to me An appetite: a feeling and a love, That had no need

    asked on June 3, 2010
  44. Math

    A box contains some red balls and some blue balls. There are four more blue balls than red balls. A ball is removed at random, replaced and a second ball randomly removed. The probability that the two balls are different colours is 21/50. How many balls of

    asked on November 10, 2016
  45. Reading

    Describe Johnny’s relationships with Cilla, Lavinia Lyte, and Dove now that Johnny is living with Rab and his family. What do these relationships reveal about Johnny and his personal growth?

    asked on December 21, 2015
  46. Physics

    A 2.87 kg object initially moving in the positive x-direction with a velocity of +4.87 m/s collides with and sticks to a 1.96 kg object initially moving in the negative y-direction with a velocity of -2.55 m/s. Find the final components of velocity of the

    asked on October 2, 2014
  47. physics

    A train travels at a constant speed around a curve of radius 225 m. A ceiling lamp at the end of a light cord swings out to an angle of 20.0º throughout the turn. Draw a free body diagram? What is the speed of the train?

    asked on November 20, 2012
  48. English

    It is impossible to have an indirect object without a subject, transitive verb, and a(n) _____. noun preposition direct object intransitive verb

    asked on November 4, 2012
  49. physics

    the coefficient of starting friction for wood on wood is 0.55. What is the force of friction of a wood block of mass 3.5 kg being pulled on a wood floor? i think i use the formula F=mMA where F is the force needed to move a solid from rest, m=coefficient

    asked on October 17, 2010
  50. Chem B

    The air in a dry, sealed 2L soda bottle has a pressure of 0.998 atm at sea level at a temperature of 34C. what will be it's pressure, if it is brought to higher altitude where the temperature is only 23C?

    asked on April 5, 2010
  51. Geography

    1. The statement, "Paraguay is one of two landlocked South American nations" describes what type of region? a.cultural b.economic c.physical d.political 2. The statement, "Farmers in this area benefit from a long growing season" describes what type of

    asked on September 9, 2010
  52. Math

    A diameter that is perpendicular to a chord bisects the chord. True or False

    asked on June 10, 2010
  53. English

    The MLA format for citing an entire website includes A. an article title. B. source from which you found the website. C. electronic publication information. D. author's apparent credibility.

    asked on March 1, 2016
  54. chemistry

    1.00 of an aqueous solution contains 1.52g of a compound used in antifreeze. If the osmotic pressure of this solution at 20.0 degree C is 448 torr, calculate the molar mass of the antifreeze compound

    asked on April 28, 2014
  55. Physics

    A car going 15 m/s is brought to rest in a distance of 3 m as it strikes a pile of dirt.  How  large a force is exerted by the seatbelts on a 90 kg passenger as the car is stopped?

    asked on June 24, 2017
  56. math

    the ratio of hydrogen atom to oxygen atoms in water is 2:1 if an amount of water contains 341 trillion atoms of oxygen how many hydrogen atoms are there? how would i do this?

    asked on October 21, 2010
  57. language

    Which of these terms is interchangeable with atmosphere? 1.setting 2.tone 3.mood 4.all of these 5.none of these

    asked on June 2, 2010
  58. Physics

    In a huge oil tanker, salt water has flooded an oil tank to a depth of h2 = 4.50 m. On top of the water is a layer of oil h1 = 7.55 m deep, as in the cross-sectional view of the tank as shown in the figure. The oil has a density of 0.700 g/cm3. Find the

    asked on October 28, 2014
  59. Physics

    Calculate the pressure on the top lid of a chest buried under 4.30 meters of mud with density 1.75 103 kg/m3 at the bottom of a 12.5-m-deep lake

    asked on October 28, 2014
  60. Chemistry

    If the density of carbon is 3.51 g/cm3, and you have a small diamond (pure carbon) that has a mass of 0.0270 grams, what is the volume?

    asked on September 4, 2016
  61. Calculus

    A tank is full of water. Find the work W required to pump the water out of the spout. r=6 h=3

    asked on December 5, 2011

    suppose you wish to estimate a population mean based on a random sample of n observations, and prior experience suggests that sd=12.7. if you wish to estimate the mean correct to within 1.6, with probability equal to .95, how many observations should be

    asked on November 15, 2010
  63. Statistics

    Suppose the correlation between SAT Verbal scores and Math scores is 0.57 and that these scores are normally distributed. If a student's Verbals core places her at the 90th percentile, at what percentile would you predict her Math score to be/

    asked on January 22, 2008
  64. Physics

    Kim is tuning a piano. She strikes a 440 Hz tuning fork and a string at the same time and hears 4 beats per second. a) What are the possibe frequencies of the string? b)She tightens the string a little then repeats. She now hears 1 beat per second. What is

    asked on February 17, 2011
  65. Physics

    When a carpenter shuts off his circular saw, the 10.0-inch diameter blade slows from 4665 rpm to zero in 2.00 s. What is the distance traveled by a point on the rim of the blade during the deceleration? (in ft). What is the magnitude of the net

    asked on November 16, 2010
  66. Chemistry

    Many metals react with oxygen gas to form the metal oxide. For example calcium reacts: 2Ca(s) + O2(g)--> 2CaO(s) Calculate the mass of calcium prepared from 4,20g of Ca and 2.80g of O2. (a) How many moles of CaO can form from the given mass of Ca? (b) How

    asked on September 29, 2009
  67. precal

    A kite flier wondered how high her kite was flying. She used a protractor to measure an angle of 36 degrees from level ground to the kite string. If she used a full 140-yard spool of string, how high, in feet, was the kite? (Disregard the string sag and

    asked on February 14, 2014

    a child is pulled on a sled across a snow-covered yard. the combined mass of the child and the sled is 35 kg. the angle that the rope pulling the sled makes with the horizontal is 34 degrees. the person pulling on the rope applies a force of 182 N. given

    asked on January 15, 2008
  69. World Geography

    What words best describe the Baltic landscape?(there can be more then one answer) a. desert b. flat c. lowland d. marshland e. mountainous f. tropical I think its B E and F Can someone please help?

    asked on May 12, 2011
  70. Physics

    A child sits on one side of a teeter totter of length 7.60 m, a distance of 49.7 cm away from the end of the beam. The child has a mass of 21.6 kg. Her mother has a mass of 43.6 kg. How far away from her end does she have to sit in order for the teeter

    asked on December 17, 2007
  71. Trig

    A pendulum swings through an angle of 22 degrees each second. If the pendulum is 30 inches long, how far does its tip move each second?

    asked on February 20, 2013
  72. Calculus

    A tank is full of water. Find the work W required to pump the water out of the spout. r=6 h=3

    asked on December 5, 2011
  73. Physical Science

    Inferring:A student examines a thermometer placed in a can containing a substance that is being heated. The temperature remains the same for several minutes, then it starts to rise.Without looking in the can, how does the student know what is occurring in

    asked on February 13, 2008
  74. Chemistry

    In a coffee-cup calorimeter, 1.50 g of NH4NO3 is mixed with 72.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.65°C. Assuming the solution has a heat capacity of

    asked on February 19, 2015
  75. chemistry

    how many liters are occupied by 0.908 mol of nitrogen at 108 degrees C and 0.858 atm pressure?

    asked on April 23, 2013
  76. Trugonometry

    Simplify the expression √x2 +1 as much as possible after substituting tan(θ) for x.

    asked on January 31, 2012
  77. Forensics

    What is a follicular tag and how can it be used to implicated a suspect of a crime?

    asked on November 14, 2010
  78. Chem B

    What mass of acetylene, C2H2, will be produced for the reaction of 90.g of calcium carbide, CaC2, with water in the following reacion? CaC2(s) + 2H20(l) ---> C2H2(g) + Ca(OH)2(s)

    asked on April 12, 2010
  79. the short story, part 2

    In "Young Goodman Brown," the allegorical meaning of Faith's pink ribbons is

    asked on November 13, 2008
  80. Chem


    asked on January 6, 2008
  81. Reading

    9. As you're revising an essay, you write down several sentences to describe your intended readers. Why should you do this? To make sure you're writing what you know, not what you believe B. To ensure that you're instructing your audience adequately C. To

    asked on December 11, 2016
  82. 12th grade economics

    Frank wants to buy a $10,000 car. The car dealer offers him financing of 60 payments at 9% interest. What will his payments be assuming he pays $0 down?

    asked on March 14, 2010
  83. Physics

    You are tasked with designing a roller coaster ride with a radius of curvature of 6.0 m.  What minimum speed must the roller coaster have at the top of the circle so that the passengers experience a sense of "'free fall"?

    asked on July 19, 2017
  84. English

    Which type of Internet resource would be the most reliable in providing accurate information? A. A general reference site such as Encyclopedia B. An email you received from your instructor C. An email listserv D. An online newsgroup dedicated to your topic

    asked on March 1, 2016
  85. math

    Tickets to a concert cost $12 for kids and $15 for adults. A total of 300 tickets were sold and total receipts were $4140. How many were adult tickets and how many kids?

    asked on February 4, 2015
  86. Organic Chemistry

    Hello I have to determine the theoritical yield of sulfanilamide after crystalization of impure sulfanilamide with 95% ethyl alcohol (the impure sulfanilamide contains 5% Fluorenone) I understand how to calculate the theoretical yield, my problem is

    asked on September 11, 2012
  87. Speech

    Why is it important for group members to be group-oriented?

    asked on April 20, 2011
  88. Physics

    A 3 kg block travels along a horizontal surface with a coefficient of kinetic friction of 0.26 at a speed of 7 m/s.  After sliding a distance of 1.0 m the block makes a smooth transition to a ramp with a coefficient of kinetic friction of 0.26.  How far

    asked on June 27, 2017
  89. Physics

    An astronaut throws a ball with mass m to the right with speed v. It strikes the wall of the space station and rebounds, moving left with a speed V/2. What was the magnitude of the impulse of the ball caused by the collision?

    asked on November 10, 2016
  90. general math 1

    can you help me with penn foster general math 1 please exam #00701300

    asked on May 27, 2010
  91. english

    What is the schwa sound in paper?

    asked on April 27, 2009
  92. math


    asked on November 8, 2018
  93. Trig

    Use the Law of Cosines to determine the indicated angle θ. (Assume a = 17, b = 10, and c = 20. Round your answer to one decimal place.)

    asked on March 2, 2016
  94. Chemistry

    2NaN(3) > 2 Na +3N(2) What mass of sodium azide must be reacted to inflate and air bag to 70.0 L at STP?

    asked on October 19, 2014
  95. Pre Calc

    Determine how many orders of magnitude the quantities differ. A canary weighing 20 g and a hen weighing 2 kg. I want to say 1 but I am not sure...

    asked on December 5, 2010

    Mr. Smith wants to save for his son’s college education. If he deposits $300 each month at 12% compounded monthly, how much (to the nearest penny) will he have in the account after 8 years? Answer = $ HOW DO I SOLVE THIS ??

    asked on September 29, 2010
  97. GCF Math Check

    Can you see if my answers are correct? Directions find the GCF: (I did the factor tree for each) 40; 2^3 times 5 128; 2^7 GCF: 2 90; 3^2 times 2 times 5 105; 5 times 3 times 7 180; 3^2 times 2^2 times 5 GCF: 5 3x^3; what is that suppose to be 6x; 2 times 3

    asked on April 15, 2010
  98. pre-calculus

    find the cube roots of -216 answer in polar form and complex

    asked on March 6, 2008
  99. physics

    A man pulls a crate of mass 53.0 kg across a level floor. He pulls with a force of 180.0 N at an angle of 28.0° above the horizontal. When the crate is moving, the frictional force between the floor and the crate has a magnitude of 124.0 N. If the crate

    asked on March 2, 2008
  100. Physics

    A 7150 kg truck traveling east at 5 m/s collides with a 1650 kg car traveling 30 degrees south of west at 20 m/s.   After the collision at what angle do the two vehicles move.   Express you answer in degrees from the positive x-axis.  Use a coordinate

    asked on July 11, 2017


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