Popular questions and responses by William
  1. Geometry

    In trapezoid $ABCD$, $\overline{AB}$ is parallel to $\overline{CD}$, $AB = 7$ units, and $CD = 10$ units. Segment $EF$ is drawn parallel to $\overline{AB}$ with $E$ lying on $\overline{AD}$ and $F$ lying on $\overline{BC}$. If $BF:FC = 3:4$, what is $EF$?

    asked on May 6, 2017
  2. Grammar Advisor

    Are these correct? I mark my answer with an X. 88. The reason to list all of the preliminary (non-procedural) information in a lesson plan is to be sure have considered each aspect. keep good records for your future needs. be able to communicate clearly

    asked on September 25, 2013
  3. chemistry

    What volume of 0.307 m naoh must be added to 200.0ml of 0.425m acetic acid (ka = 1.75 x 10-5 ) to produce a buffer of ph = 4.250?

    asked on July 18, 2018
  4. Trig application

    I can't figure this out. A famous golfer tees off on a long, straight 459 yard par 4 and slices his drive 10 degrees to the right of the line from tee to the hole. If the drive went 288 yards, how many yards will the golfer's second shot have to be to

    asked on October 29, 2015
  5. English

    In Academy writing, introductions must include a thesis statement. true or false

    asked on July 14, 2020
  6. Grammar Advisor

    I just cannot figure out if these answers are correct or not. Can you please help me? 78. If the sound system hadn’t failed, last night’s show would have been better. This is a correct sentence using the 1st conditional form. x This is a correct

    asked on September 25, 2013
  7. Chemistry

    Gold is alloyed with other metals to increase its hardness in making jewelry. Consider a piece of gold jewelry that weighs 9.85 g and has a colume of 0.675 cm cubed. The jewelry contains only gold and silver, which have densities of 19.3 g/cm cubed and

    asked on July 25, 2005
  8. math

    if a polynomial leaves a remainder of 5 when divided by x-3 and a reminder of -7 when divided by x+1, what is the reminder when the polynomial is divided by x^2-2x-3?

    asked on March 21, 2019
  9. biology

    There are two methods used for cutting DNA into small pieces – this is via ultrasound and restriction enzymes. Which method is considered better and why?

    asked on May 21, 2008
  10. Algebra 1

    Write M={1,3,5,7,9,11,13,15,17,19} in set builder notation

    asked on December 24, 2019
  11. Finance

    Winnebagel Corp. currently sells 33,000 motor homes per year at $49,500 each, and 13,200 luxury motor coaches per year at $93,500 each. The company wants to introduce a new portable camper to fill out its product line; it hopes to sell 23,100 of these

    asked on February 4, 2012
  12. chemistry

    What is the %v/v concentration of a solution made by adding 25 ml of acetone to 75 ml of water?

    asked on July 22, 2018
  13. Ap Chemistry

    Can anyone help me with this question How much NaCl should be added to 0.35 L of a 0.15 M solution of AgNO3 so that it reacts completely with the silver to form AgCl(s)? A. 8.8 g B. 0.0525 g C. 0.89 mg D. 3.07 g

    asked on April 12, 2018
  14. Psychology

    Agatha maintains that people are capable of freely making voluntary choices. Constance is mainly focused on how aggression is caused by genetic inheritance. It seems reasonable to assume that Constance is not much interested in environmental factors

    asked on May 29, 2019
  15. geometry

    In triangle $ABC$, $BC = 4$, $AC = 3 \sqrt{2}$, and $\angle C = 45^\circ$. Altitudes $AD$, $BE$, and $CF$ intersect at the orthocenter $H$. Find $AH:HD$. I tried using the pythagorean theorem to find side lengths, algebraically, but I couldn't find

    asked on June 23, 2017
  16. Physics

    A flea can jump a vertical height h. What is the maximum horizontal distance it can jump? What is the time in the air in both cases?

    asked on November 15, 2017
  17. Art

    1. Why would an artist chose to use harmony in a piece of artwork? 2. Perspective drawings will utilize all methods listed here except? 3. To create an image that is not harmonious, an artist could...?

    asked on November 3, 2014
  18. Math

    Work out the product of 1 3/5 and 8 1/2 Give your answer in its simplest form as a mixed number.

    asked on April 15, 2020
  19. geometry

    Isosceles $\triangle{ABC}$ has a right angle at $C$. Point $P$ is inside $\triangle{ABC}$, such that $PA=11$, $PB=7$, and $PC=6$. Legs $\overline{AC}$ and $\overline{BC}$ have length $s=\sqrt{a+b\sqrt{2}}$, where $a$ and $b$ are positive integers. What is

    asked on May 28, 2017
  20. English

    @ words : 1- curtail 2- devastate 3- digress 4- incentive 5- incorporate 6- indispensable 7- intermittent 8- rigor 9- squander 10-succumb Linda never had to work hard to make good grades in high school. But in college, where the ___(8)___ of course work

    asked on October 23, 2014
  21. Chemistry

    A compound containing 3 atoms of carbon and 8 atoms of hydrogen is combined in a reaction with oxygen molecules. The two end products of this equation are carbon dioxide and water. What element should you look at first in balancing this equation? A. oxygen

    asked on November 7, 2009
  22. math

    The surface area covered by a rectangular playground is 100 square yards. The width of the playground is 15 yards longer than its length. Using factors, find the length and the width of the playground.

    asked on November 28, 2016
  23. Physical Science

    An exercise spring has a spring constant of 315 N/m. How much work is required to stretch the spring 30 cm? What force is needed to stretch the spring 30 cm?

    asked on December 19, 2012
  24. physics

    Two disks are mounted (like a merry-go-round) on low-friction bearings on the same axle and can be brought together so that they couple and rotate as one unit. The first disk, with rotational inertia 3.30 kg·m2 about its central axis, is set spinning

    asked on April 18, 2010
  25. chemistry

    The amount of copper was determined in 10 g sample. copper was precipitated, filtered and calcined, obtaining a final precipitate of 0.79 g oxide of copper , What % in copper mass in this sample?

    asked on June 24, 2020
  26. Algebra

    The legs of an isosceles triangle are 0.3 foot less than twice the base. The perimeter of the triangle is 4.9 feet. What is the length of one of the triangle’s legs?

    asked on May 1, 2015
  27. English

    How is the word brusque used in a complex sentence? please give examples.

    asked on October 28, 2014
  28. calculus

    The circumference of a sphere was measured to be 74 cm with a possible error of 0.5 cm. (a) Use differentials to estimate the maximum error in the calculated surface area. (Round your answer to the nearest integer.) cm2 What is the relative error? (Round

    asked on March 18, 2012
  29. Physics

    Left over from the big-bang beginning of the universe, tiny black holes might still wander through the universe. If one with a mass of 3.5 1011 kg (and a radius of only 1.0 10-14 m) reached Earth, at what distance from your head would its gravitational

    asked on February 19, 2011
  30. chemistry

    What is the pH of sodium hydroxide (NaOH) 0.5N

    asked on June 26, 2018
  31. Calculus

    For Questions 1–2, use the differential equation given by dy/dx = xy/3, y > 0. 1. Complete the table of values x -1 -1 -1 0 0 0 1 1 1 y 1 2 3 1 2 3 1 2 3 dy/dx 2. Find the particular solution y = f(x) to the given differential equation with the initial

    asked on May 7, 2018
  32. Chemistry

    Calculate the heat of reaction (ΔHrxn) for the following reaction: 5O2(g) + 4NH3(g) → 6H2O(g) + 4NO(g)

    asked on April 13, 2018
  33. chemistry

    Which is the mass of the solute in 400 grams of 20% solution. What is the concentration of this solution knowing that its density is 1.2 g/mL

    asked on September 21, 2017
  34. Vectors, Math

    A is (3, 2) and point B is 4 units from A in the direction (1,-1) Find AB(arrow). Find the coordinates of B. I can't do this question, Ive attempted it many times.

    asked on April 11, 2016
  35. Chemistry

    A sample of calcario and other components of the soil was intensely warm. Under these conditions, the calcario undergoes decomposition in calcium oxide and carbon dioxide. CaCO3 (s)-> CaO (s) + CO2 (g) The analysis of 71, 42 g of a sample of limestone

    asked on March 28, 2016
  36. physics

    3 equal charges each of of 2*0.000001C are fixed at three corners of an equilateral triangle ofsides 5 cm.find the column force experienced by one of the charge due to the other two

    asked on March 23, 2016
  37. History Help?

    What role did Stephen Austin play in the settlement of Texas by American colonists? He defeated Santa Anna's army, making it safe for colonists in the region. He convinced American colonists in Texas to declare their independence from Mexico. He received a

    asked on December 1, 2014
  38. Psychology

    Sources of stress do not automatically cause stress-related problems. Moderators of stress, which can include our personal strengths, might mean that we can have a healthier and more productive life in spite of life's challenges, or maybe even because of

    asked on October 28, 2012
  39. physics

    A piece of metal at 80 degrees celsius is placed in 1.2 L of water at 72 degrees celsius. The system is thermally isolated and reaches a final temperature of 75 degrees celsius. Estimate the approximate change in entrophy for this process.

    asked on April 19, 2012
  40. chemistry

    how many grams of Na2CO3 must be dissolved into 155 g of water to create a solution with the molality of 8.20 mol/kg?

    asked on December 6, 2010
  41. calc2

    A manufacturer sells two products, one at a price of $3000 a unit and the other at a price of $12000 a unit. A quantity q1 of the first product and q2 of the second product are sold at a total cost of $5000 to the manufacturer. Express the manufacturer's

    asked on December 1, 2010
  42. chemistry

    How do you calculate the energy released when 1 mole of ethanol, C2H5OH, is burned?

    asked on November 7, 2010
  43. Science

    How much would a 75 kg man weigh due to the effect of gravity?

    asked on November 4, 2010
  44. chemistry

    What is the volume of solution in which 7.6 g of FeSO4 should be dissolved in order to obtain a solution is 0.1 N?

    asked on June 6, 2020
  45. Maths

    Two people depart from the same spot.One traveling North at at 5 ft per second and one traveling East at 1 ft per second.How fast are they separating from each other after 5 seconds?

    asked on April 14, 2020
  46. Counseling

    What courses can I do with the subject like Geography, Life Sciences, Agricultural Sciences and Mathematical Litaracy?

    asked on February 1, 2020
  47. math

    a plant grew 18 inches over 5 months. the plant grows the same amount each month. use this rate to complete the tabel

    asked on November 21, 2019
  48. science

    An electric train moving at 20kgh-1 accelerate to a speed of 30kgh-1 in 20s.find the distance travel in meters during the period of acceleration.

    asked on September 19, 2019
  49. Chemistry

    What mass of H2 gas would be formed when 2.45 g Zn reacts with excess acetic acid? Zn (s) + 2 HC2H3O2 (aq) ------> H2 (g) + Zn (C2H3O2)2(aq)

    asked on September 13, 2019
  50. Lo

    Suggest how attitude and safety skills may deal with the impact of environmental factors at a personal level.

    asked on August 10, 2019
  51. life orientation

    define risky behaviours

    asked on August 3, 2019
  52. english

    who should I choose on call of the wild

    asked on July 24, 2019
  53. Math

    A, B, C and D are four points on a line such that AB:AC = 7:10, and BD:CD = 9:2. If CD = 9 cm, what is the length, in cm, of AB? A) 49 B) 64 C) 54.25 D)73.25 E)70

    asked on October 2, 2018
  54. chemistry

    Calculate the volume of hydrogen gas from the C4H9O3N compound, under temperature or pressure conditions (STP).

    asked on July 30, 2018
  55. chemistry

    Indicate what type of compound (ionic or covalent) would be expected from the possible binary combinations of the following elements: O, F, Cs, CI, Na. Consider the elements ' negativity

    asked on July 30, 2018
  56. chemistry

    The melting temperatures of the two isomers of molecular formula C2H6O are-139 °c and-115 °c. Knowing that one of the isomers is an alcohol and the other a ether, indicate the melting temperature corresponding to each of them

    asked on July 13, 2018
  57. chemistry

    A calorimeter is filled with 250.0 g of water at 24.6oC. A 60.0 g sample of a metal at 100.0 oC is dropped in this calorimeter and causes the temperature to increase a total of 4.5oC. What is the specific heat of the metal (in J/g°C)? Ignore the

    asked on July 1, 2018
  58. chemistry

    What volume of 15.00 M CaCl2 solutions is needed to make 3.000 gallons of 5.500 M CaCl2 solution ?

    asked on July 1, 2018
  59. Calculus

    The table below gives selected values for the function f(x). Use a trapezoidal estimation, with 6 trapezoids to approximate the value of 2∫1 f(x) dx . x 1 1.1 1.3 1.6 1.7 1.8 2.0 f(x) 1 3 5 8 10 11 14

    asked on June 28, 2018
  60. chemistry

    25 ml of milk were titrated with a 0.124M KOH solution of potassium hydroxide. If 4.5 ml of KOH solution were required to reach the titration endpoint, with a percentage (% w / v) lactic acid present in the milk? (MM = 90.08g / mol)

    asked on June 16, 2018
  61. Algebra 1

    A salesman starts a trip with 15 gallons of gasoline in his tank. After traveling 220 miles he has 10 gallons of gasoline in his tank. Model this relationship with a linear equation relating the number of miles you can travel to the remaining gallons of

    asked on July 18, 2017
  62. software development

    statement that assigns the length of an array named intMovieTimes to intSpan. intPan = (intMovies.intSpan).

    asked on July 11, 2017
  63. Trig/PreCalc

    Find a parametrization for the line segment with endpoints (5,2) and (-2, -4).

    asked on January 10, 2017
  64. Physics

    A space station, in the form of a wheel 197 m in diameter, rotates to provide an “artificial gravity” of 2.5 m/s2 for persons who walk around on the inner wall of the outer rim. The rate of the wheel’s rotation in revolutions per minute that will

    asked on December 8, 2016
  65. Physics

    A 5.7 g bullet leaves the muzzle of a rifle with a speed of 636.8 m/s. What constant force is exerted on the bullet while it is traveling down the 0.5 m length of the barrel of the rifle? Answer in units of N

    asked on October 13, 2016
  66. geometry

    The endpoints of are A(2, 2) and B(3, 8). is dilated by a scale factor of 3.5 with the origin as the center of dilation to give image . What are the slope (m) and length of ? Use the distance formula to help you decide: .

    asked on September 11, 2015
  67. Algebra

    The measure of the smallest angle of a triangle is one-fourth the measure of the largest angle. The measure of the second angle is 36 less than the measure of the largest angle.

    asked on August 31, 2015
  68. math

    Kendra bought 4 paintings and wants to hang them side by side on a wall in her bedroom. However, only 3 of the paintings will fit side by side on this wall. How many different ways can Kendra arrange 3 of the 4 paintings on the wall?

    asked on July 31, 2014
  69. math

    Sheila received a 6.5% commission on a house she sold for $110,400. How much commission did she receive?

    asked on August 14, 2013
  70. Science

    Which of the following is true about an object that floats in water? (1 point) The object is less dense than frozen water. The mass of the object is less than that of water. The density of the object is less than that of water. The volume of the water is

    asked on April 19, 2013
  71. math

    I am moving to a new house. My old house is 3 kilometers from my new house. How many meters is the old house from the new house?

    asked on October 30, 2012
  72. vocabulary

    The ----------- definition of gloomy is dismal or depressing.

    asked on June 18, 2012
  73. Physics

    At a city park, a person throws some bread into a duck pond. Two 4.00-kg ducks and a 9.00-kg goose paddle rapidly toward the bread, as shown in our sketch (Intro 1 figure) . If the ducks swim at 1.10 m/s, and the goose swims with a speed of 1.30 m/s, the

    asked on March 25, 2012
  74. chemistry

    The combustion of 0.1619 g benzoic acid increases the temperature of a bomb calorimeter by 2.77°C. Calculate the heat capacity of this calorimeter. (The energy released by combustion of benzoic acid is 26.42 kJ/g.) kJ/°C A 0.1510 g sample of vanillin

    asked on November 13, 2011
  75. chemistry

    Consider the dissolution of CaCl2. CaCl2(s) Ca2+(aq) + 2 Cl-(aq) ΔH = -81.5 kJ A 13.0 g sample of CaCl2 is dissolved in 134 g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the

    asked on November 13, 2011
  76. math

    find the product or quotient. write the strategy you used, write model, break apart, multiplication table, inverse operations, pattern, or doubles

    asked on September 25, 2011
  77. Chemistry

    100 grams of glucose is mixed with 500 grams of water. 10 grams of yeast is then added to the mixture. If the reaction goes to completion, what is the mass of ethanol in the final mixture?

    asked on April 28, 2011
  78. Math - Calculus

    Show that the equation x^3-15x+c=0 has at most one root in the interval [-2,2].

    asked on February 28, 2011
  79. Physics Craziness

    A big olive (m = 0.40 kg) lies at the origin of an xy coordinate system, and a big Brazil nut (M = 1.2 kg) lies at the point (1.0,2.0) m. At t = 0, a force o = (2.0 + 3.0) N begins to act on the olive, and a force n = (-3.0 - 2.0) N begins to act on the

    asked on February 28, 2011
  80. help me physics

    The femur is a bone in the leg whose minium cross-sectional area is about 3.60 E-4 m2. A compressional force in excess of 6.90 E4 N will fracture this bone. (a) Find the maximum stress that this bone can withstand. 1 N/m2 (b) What is the strain that exists

    asked on November 16, 2010
  81. Accounting please help in homework

    The overall (weighted average) cost of capital is composed of a weighted average of : a)The cost of common equity and the cost of debt b)The cost of common equity and the cost of preferred stock c)The cost of preferred stock and the cost of debt d)The cost

    asked on August 5, 2010
  82. Triginometrry

    Solve an equation 8x^3+4x^2-18x-9=0 algebraically for all values of x.

    asked on January 1, 2010
  83. math

    What is the value of the underline digit 6 in 4,600,028

    asked on August 31, 2011
  84. chemistry

    Is there a salt bridge in a fuel cell? I think there isn't one because hydroxide ions and hydrogen ions are in the water, so they can move around freely already.

    asked on February 21, 2008
  85. chemistry

    a technician went to the laboratory to prepare a solution of 250.0 mL of calcium carbonate (Na2CO3). It was weighed on the analytical balance 1.3316g of the solid calcium carbonate reagent. Knowing that salt has 99.5 %m/m, calculate the %m/v of this

    asked on June 28, 2020
  86. Physics

    Principle of moments.

    asked on May 2, 2020
  87. Physics

    State the reason why a steel sphere resting on a horizontal surface is said to be in neutral equilibrium.

    asked on May 2, 2020
  88. creative writing

    the clover told me he was good luck

    asked on April 30, 2020
  89. Pre-calculus

    An airplane’s velocity with respect to the air is 569 miles per hour, and it is heading N 63 ◦ W. The wind, at the altitude of the plane, is from the southwest and has a velocity of 77 miles per hour. Draw a picture that gives a visual representation

    asked on April 8, 2020
  90. math (algebra)

    If x = 6 and y = −2, find the value of (a) x² (b) 5x + y (c) x + y²

    asked on March 26, 2020
  91. science


    asked on April 24, 2019
  92. Engilsh

    An Essasy A Short Incident I Witness

    asked on October 13, 2018
  93. Physics

    A car travels for .50 of a trip at 20 km/h. How fast must it travel in the second half to average 55 kmh?

    asked on September 20, 2018
  94. math

    What is the answer to to 85,639 with the underlined being 3 answer ? I got 85,640 is this correct

    asked on September 10, 2018
  95. chemistry

    What is the g/L concentration of a solution terminating 10g of NaCI with 95% purity in 250 ml of water?

    asked on July 12, 2018
  96. chemistry

    Knowing that the Atom X mass is equivalent to 6 boron 10 atoms, what is the relationship between the masses of atom X and the carbon atom 12?

    asked on June 28, 2018
  97. chemistry

    5.750 ml of a soil sample was dissolved in water up to the volume of 50 ml. An aliquot of 10 ml of the same was transferred to an Erlenmeyer flask and added 10 ml of KOH 1 mol L-1 and 2. Drops of Calcein and the solution that had a yellow coloration was

    asked on June 24, 2018
  98. chemistry

    An analyst wants to determine the content of a 7% magnesium hydroxide bottle acquired in a drugstore, through the Volumetry method of neutralization. 8.995 g of magnesium hydroxide suspension were avolumados to 100ml of water, then,25 ml were added to the

    asked on June 14, 2018
  99. chemistry

    We can determine the content (%) of calcium in milk through complexometric analysis by titration with EDTA. If we weigh 0.50 g of milk powder and titrate with EDTA 0.010 mol/L. What percentage of Ca2+does the milk if expended EDTA was 13.6 ml?

    asked on June 13, 2018
  100. chemistry

    A 100ml aliquot of a water sample containing Ca(II) and Mg(II) is titrated with 22,74mL of EDTA 0.00998 mol/L at PH 10. Another aliquot of 100ml of the same sample is treated with NaOH to precipitate Mg(OH)2 and is then titrated with PH 13 with 15.86 ML of

    asked on September 27, 2017


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