Popular questions and responses by Stephen
  1. Math- PLEASE HELP

    Altitudes $\overline{XD}$ and $\overline{YE}$ of acute triangle $\triangle XYZ$ intersect at point $H$. If the altitudes intersect at a $123^\circ$ angle, and $\angle YXH = 26^\circ$, then what is $\angle HZX$ in degrees?

    asked on April 21, 2016
  2. Math 117

    A class has 10 boys and 12 girls. In how many ways can a committee of four be selected if the committee can have at most two girls?

    asked on October 3, 2008
  3. Physics

    A plane wave has an equation y=25 sin(120t - 4x), find wavelength in meters,frequency,period,velocity and amplitude.

    asked on June 24, 2019
  4. Math

    The question goes as follows: Two trains are moving toward each other at speeds 17 mph and 43 mph. How far apart are they 1 minute before they pass each other? So I have been trying to answer this question for a while now, and it is turning out to be a

    asked on August 15, 2016
  5. physics

    a ball of mass 0.1kg is thrown vertically upwards with an initial velocity of 80m/s.calculate the potential energy (I) half way up (ii) at its maximum height.what is the kinetic energy as it leaves the ground

    asked on March 13, 2016
  6. Maths

    Change these fractions to twentieths and then arrange them in order of size, smallest first. 7/20 2/5 3/4 7/10

    asked on September 8, 2015
  7. Physics

    Three point charges are placed on the x-y plane as follows: Q1=-1.2nC at ( 3,4)cm, Q2=2.3nC at (0,0)cm and Q3=-3.7nC at (5,0)cm. What is the net force exerted by the two point charges on Q2?

    asked on January 22, 2018
  8. MATH


    asked on June 5, 2019
  9. English

    peer pressure destroys character yes or no?.

    asked on January 29, 2017
  10. chem

    What mass of hydrochloric acid (in grams) can be neutralized by 2.3g of sodium bicarbonate? (: Begin by writing a balanced equation for the reaction between aqueous sodium bicarbonate and aqueous hydrochloric acid.)

    asked on April 5, 2011
  11. Math HELP

    The table below shows the measured dimensions of a prism, and the maximum and minimum possible values based on the greatest possible error. Dimensions l w h Measured 9 5 3 Maximum 9.5 5.5 3.5 Minimum 8.5 4.5 2.5 a. Find the measured volume. b. Find the

    asked on November 19, 2010
  12. Math

    Shows an equilateral triangle with the length of its sides given in terms of a and b.4a cm and 3b cm.(a+b+c)cm.

    asked on February 7, 2019
  13. math

    For the Rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. For an 10 month period, the last term is and the series sum is . For a 15 month period, the last term is and the series sum is . For a 20 month

    asked on March 15, 2016
  14. Math

    1. The curve y=10/2x+1 -2 intersects the x-axis at A. The tangent to the curve at A intersects the y-axis at C. (i) Show that the equation of AC is 5y+4x=8 (ii) Find the distance of AC 2. The equation of a curve is y=1/6(2x-3)^3-4x (i) Find dy/dx (ii) Find

    asked on January 14, 2013
  15. math

    suppose you are drinking root beer from a conical cup. the cup has a diameter of 8 cm and a depth of 10 cm. as you suck the straw, root beer leaves the cup at the rate of 7 cm^3/second. at what rate is the level of the liquid in the cup changng when the

    asked on January 1, 2011
  16. Physics

    A ball of mass 0.3kg, moving at a velocity of 20ms-1 is suddenly hit by a force of 5N for a time of 0.03 sec. find its new velocity

    asked on April 25, 2019
  17. chemistry

    when a quantity of powdered sulphur is burnt in excess oxygen, 100cm3 of SO2 were produced at STP CAL,the vol of gas at STD

    asked on November 11, 2016
  18. ss

    In what ways can it be argued that the European union caused ww1 and ww2

    asked on March 17, 2015
  19. Physics

    Lightning occurs when there is a flow of electric charge (principally electrons) between the ground and a thundercloud. The maximum rate of charge flow in a lightning bolt is about 20,000 C/s, this lasts for 100 μs or less. How much charge flows

    asked on June 18, 2020
  20. AP Chem help?!!!!

    What effect will dissolving larger amounts of salt in a beaker of water have on the concentration and conductivity of the solution? 1. The concentration does not change, but the conductivity increases. 2. Both concentration and conductivity decrease. 3.

    asked on August 18, 2016
  21. math 121

    Henry will reject a cookie with less than 8 raisins.In the past, one out of every 100 cookies had less than 8 raisins. Find theprobability that the first cookie Henry rejects is the 5th cookie on the line.

    asked on November 20, 2012
  22. Math

    AB+BA = 1A4 In the correctly worked out addition problem above, A and B represent two different digits. What digit does A represent? a 3 b 4 c 5 d 8 e 9

    asked on September 2, 2011
  23. Chemistry

    Calcium carbonate of mass 10g was heated until there was no further change A. Write an equation for the reaction B. Calculate the mass of the residue C. Calculate the volume of gas evolved at STP D. What would be the volume of the gas measured at 15°C and

    asked on April 23, 2020
  24. Chemistry

    Diamonds are measured in carats, and 1 carat=0.200g. The density of diamonds is 3.51g/cm3. what is the volume of a 5.0-carat diamond, expressed in liters?

    asked on October 16, 2019
  25. math probability

    A fair tetrahedral die (with face 1,2,3 and 4)and a fair coin are tosses together Construct a table of sample space of a random experiment Use your sample space to.find the probability that (1):a tail and an odd number show up (2):a head and a square show

    asked on April 28, 2019
  26. AP Calculus AB

    The fence around Wayne Manor (a rectangular plot of land) is going to be replaced. No fence will be required for the side lying along Gotham river. If the new wrought iron fence costs $12 per meter for the side parallel to the river and $4 per meter for

    asked on December 11, 2016
  27. AP Chemistry help!!!!!

    How does the boiling point of ethane (CH3CH3) compare with that of ethanol (CH3CH2OH)? 1. The boiling point of ethane is higher because it has stronger London dispersion forces. 2. The boiling point of ethane is higher because it has stronger dipole-dipole

    asked on August 18, 2016
  28. art

    what perspectives are important in understanding a work of art?

    asked on March 2, 2015
  29. Programming

    I need help with debug Debug06-02 // Program lets user input scores on four tests // Average is computed and letter grade is determined // Letter grades are based on 90 for an A, 80 for a B, and so on start string name num score num NUM_TESTS = 4 num

    asked on June 16, 2013
  30. Chemistry

    Given Zn(NO3)2 + (NH4)2S = ZnS + 2NH4NO3 (molar mass of Zn(NO3)2 189 g, molar mass of (NH4)2S 68 g), what is the molarity of a 250 ml solution if you have 123 g of zinc nitrate?

    asked on March 20, 2013
  31. phy

    a watermelon seed has the following coordinates: x= -5.0, y = 8.0m, and z = 0m. find its position vector (a) in unit-vector notation and as (b) a magnitude and (c) an angle relative to the positive direction of the x axis (d) sketch the vector on the

    asked on February 9, 2013
  32. Physics

    4. As shown in the figure shown below, find the total electric potential due to the two point charges A and B. +8.0 x 10-9 C A B -8.0 x 10-9 C | | | | 0.20 m 0.20 m 0.40 m

    asked on June 18, 2020
  33. Physic

    A Uniform beam 6.0 metre long and weighing 4kg rest on supports at p and q placed left and right 1.0 metre from each end of the beam. Weights of mass 10kg and 8kg are placed near p and q respectively one each end of the beam. Calculate the reactions at p

    asked on February 18, 2019
  34. Calculus

    Hello, I would greatly appreciate any help that I can have with the following calculus question below. It has to do with separable differential equations. I'm also going to explain what I've done so far, so please bear with me (but honestly I don't think

    asked on April 16, 2017
  35. math

    if the three sides of an equilateral triangle are 3x + 2, 2y - X and y + 3. find X and y and the perimeter of the triangle. kindly elucidate further on this question

    asked on November 22, 2016
  36. Math

    A hiker started to climb up the hill at 6:00 am and either kept climbing up or rested at some place(s). He reached the top at 6:00 pm. he rested there for the next 12 hours. Next day at 6:00 am, he began to travel down the same path. He either moved

    asked on August 17, 2016
  37. chemistry

    what will be formed when oxygen combines with hydrogen in the presence of hydrated iron 3 oxide?

    asked on July 17, 2016
  38. Chemistry

    how many molecules of N2 could fit in a 2.00L soda bottle at 23C and 755mmHg

    asked on March 30, 2015
  39. Algebra

    If there is a grid and you are going to draw three different rectangles so that each has an area of 12 square units and they all have different widths. What are the dimensions of the rectangle? Please help answer

    asked on January 5, 2015
  40. Physical Science 9

    what part of the carbon process is responsible for the release of carbon at a p[power plant combustion photosynthesis digestion decomposition my answer is a combustion

    asked on March 30, 2014
  41. Science

    How did the discovery of neutrons change the atomic model?

    asked on March 18, 2014
  42. trigonometry

    How do i do them? :l 7. At 2:00 P.M., the angle between the hour and minute hands on a clock is 60° (approximately 1.05 radians). The arc length formed by the two hands is 2.63 inches. What is the radius of the clock in inches? (Round to the nearest

    asked on December 12, 2012
  43. math

    what is the volume of a rectangular prism l=7in.w=5in.h=3in.

    asked on December 5, 2012
  44. chemistry

    what is the result of using 75g of dihydronoxybutanedioric acid in one liter of H2O in a titration? I do not have a answer.

    asked on October 4, 2012
  45. calculus

    find the most general antiderivative of the function f(t)=8t-3sec^2t

    asked on July 1, 2011
  46. chemistry

    When 15.3g of NaNO3 was dissolved in water inside a constant pressure calorimeter, the temperature fell from 25.00 °C to 21.56 °C. If the heat capacity of the calorimeter (including the water it contains) is 1071 J/°C, What is the enthalpy change for

    asked on March 4, 2011
  47. science

    how does(what is the chemistry involved) k2so4 raise the boiling point of h2so4

    asked on January 30, 2011
  48. Microeconomics

    In a patent-driven market, using the concept of minimum efficient scale of production, explain what would happen to competiton and to price when the patent expires? I don't see how I can interweave the minimum efficient scale of production into this

    asked on November 7, 2010
  49. physics

    during 4.0 min a 5.0 a current is set up in a wire,how many coulombs and the electrons pass through any cross section across the wire?

    asked on October 14, 2010
  50. chemistry

    calculate the number of liters of liquid ethanol (density = 0.789g/ml) required to obtain a sample containing 1.00*10^25 C2H5OH molecules

    asked on February 28, 2010
  51. Physics

    Two objects 18.5m apart both have the same charge. If the force on one of them is 0.4029N what is the charge (in µC) on the object?

    asked on June 18, 2020
  52. Math

    If X is partly costant and partly varies with y, when y=40, X=150, and when y=54,x=192. find x when y=73

    asked on February 25, 2020
  53. chemistry

    state two mathematical expression for Raoult's law

    asked on May 22, 2019
  54. chemistry

    state the equation for the determination of molecular mass using (i)osmotic pressure (ii)depression of freezing

    asked on May 22, 2019
  55. chemistry

    an arcaecologist recovered wood with a specific activity of 8.61d/min.g, assume the ratio of 12C/14C in a living plant has the activity of 15.3d/min.g estimate the age of the wood?

    asked on May 22, 2019
  56. chemistry

    what volume (in litres) of 17.6M NaOH will be used to prepare 0.5M NaOH in 50,000ml?

    asked on May 22, 2019
  57. chemistry

    given that 5milimeter of 5.2mol per liter NaCl will be used to prepare 0.026mol per liter NaCl, describe how you will prepare this solution?

    asked on May 22, 2019
  58. chemistry

    what are the distinct characteristic does radiocarbons depends on?

    asked on May 22, 2019
  59. chemistry

    the label of a bottle of NaOH bears the following of 46.7% and density of 1.57gml calculate the molar concentration of it?

    asked on May 22, 2019
  60. Chemistry

    Given Lead (||) oxide, nitric (V), sodium carbonate solution and water. Explain briefly how you can prepare Lead (||) Carbonate. Use equation where possible.

    asked on March 25, 2019
  61. chemistry

    What will happen if ammonium chloride solution is used to standardize the potassium tetraoxomangate(vii)solution?

    asked on May 20, 2017
  62. Maths

    Solve : | x | - 5 > 6

    asked on May 6, 2017
  63. Physics

    A sphere of radius r =5cm and volume charge density ρ=14μC/m^3 spins at ω=200rad/s . What is the magnetic field at the center of the sphere in Tesla?

    asked on March 5, 2017
  64. Math

    Students measure the velocity of a car as it races along a track in a clockwise direction. Their measurements are detailed below: Time (sec) | Velocity (in/sec) 0 | 4 1 | 8 2 | 10 3 | 6 4 | 9 5 | 12 6 | 5 7 | 8 8 | 10 9 | 6 10 | 12 Estimate the distance

    asked on January 22, 2017
  65. math

    The roof of a tunnel is in the shape of a parabolic arch whose highest point is 18m above the road. The road surface is 16m wide. Lights are placed in the tunnel 12 meters high. How far from center of the tunnel are the lights placed?

    asked on January 19, 2017
  66. Calculus

    The Question: A particle moves along the X-axis so that at time t > or equal to 0 its position is given by x(t) = cos(√t). What is the velocity of the particle at the first instance the particle is at the origin? So far I was able to determine that the

    asked on December 27, 2016
  67. science

    How many drop (1drop=0.05ml) of 0.20M potassium iodide must we add to 0.010M Pb(NO3)2 to get precipitation of lead iodide to start if Ksp of lead iodide is 7.1x10^-9.

    asked on November 28, 2016
  68. Riddle

    Long_short,round_square,good_broken,painted_plaine. What are they.

    asked on November 26, 2016
  69. math

    subtract 3x-12/4x^2-8*2x^2-4/9x-36

    asked on September 30, 2016
  70. Physics

    I'm having Sig fig troubles. What would 0.98*2040 be using Sig fig rules???

    asked on September 13, 2016
  71. math

    if V(r)=4/3 pir^(3) find (v2r)/(vr)

    asked on September 5, 2016
  72. Math

    Let K(x)= (sin(3x-7)) / (e^x-2) (I'm sorry if it is not clear here, but the denominator in K(x) has the natural number, e, to the power of just x. So "x-2" is not the exponent. "x" is the exponent). The Question: Does K(x) have a horizontal asymptote? (I'm

    asked on September 4, 2016
  73. English

    Is the word "and" still considered a coordinating conjunction if it is being used in a list rather than to connect two independent clauses? For example: "Jeff wants to buy an apple, a pear, and a banana" Is the "and" used in that sentence still a

    asked on August 24, 2016
  74. English

    Just out of curiosity, is it okay to use the phrase "and so" in a sentence? Like "Johnathan knew that he had to help the boy asking a question on Jiskha. And so, he did just that, and the boy went on to being the happiest boy on earth." I just need to know

    asked on August 21, 2016
  75. Math

    Context: The function v(t) represents the velocity of a particle moving along a horizontal line at any time, t, greater than or equal to zero. If the velocity is positive, the particle moves to the right. If the velocity is negative, the particle is moving

    asked on August 20, 2016


    asked on July 3, 2016
  77. Geometry

    Point $G$ is the midpoint of median $\overline{XM}$ of $\triangle XYZ$. Point $H$ is the midpoint of $\overline{XY}$, and point $T$ is the intersection of $\overline{HM}$ and $\overline{YG}$. Find the area of $\triangle MTG$ if $[XYZ] =150$.

    asked on April 21, 2016
  78. mathematics

    A mortgage is taken out of 100000 dollars and is repaid by annual instalments of 20000 dollars. Interest is charged on the outstanding debt at 10 percent annually. If the first repayment is made one year after the mortgage is taken out, find the number of

    asked on January 28, 2016
  79. Social Studies

    Why did the Spanish and French start fighting? Question from Social Studies weekly week 8 for 4th graders.

    asked on October 25, 2015
  80. programming in basic

    1 If four statements are entered with the same statement number, the computer will accept the ______ statement with the duplicate statement number first second third fourth 2 ______ is a valid BASIC number? 567890100 200,000 $65 1.05E+09 3 Data provided

    asked on October 6, 2015
  81. Algebra

    Simplify. -x^3(1-x^2)^-1/2 -2x(1-x^2)^1/2 ------------------------------- x Do I first start by getting rid of the negative exponents? I do not know where to begin. Please help.

    asked on August 21, 2015
  82. Algebra

    Factor by removing the common factor with the lesser exponent 2x(x-5)^-3 -4x^2(x-5)^-4 I don't really know how to do this. The final answer I got is: 2x(2x^2-10x+1) -------------- (x-5)^4

    asked on August 21, 2015
  83. Algebra

    t^2/ã(t^2+1) - ã(t^2+1) ------------------------- t^2 Is the final answer -1/t^2 sqrt(t^2+1)

    asked on August 21, 2015
  84. Algebra

    Simplify 5^-1/2 * 5x^5/2 (5x)^-3/2 My final answer was x/sqrt5

    asked on August 21, 2015
  85. Algebra

    Solve the complex fraction ((t^2/sqrt t^2+1)-sqrt t^2+1))/t^2 Is the LCD to multiply by sqrt t^2+1????? Please help!

    asked on August 21, 2015
  86. Algebra

    5^-1/2 x 5x^5/2(5x)^-3/2= 1/sqrt5 x sqrt5x^5 x 1/sqrt5x^3= ??? I need to simplify and I need help understanding what the next step is

    asked on August 20, 2015
  87. Algebra

    Rationalize numerator. ((sqrt7)-3/4)(sqrt7+3/sqrt7+3) I got that the answer is 7-9/4sqrt7+12= -2/4sqrt7+12

    asked on August 20, 2015
  88. Finance

    BH Holding Inc. is considering undertaking a capital project, costing $8 million today. in addition, the project will be installed over the next 2 years, costing $1.0 million at the end of the first year and $0.5 million at the end of the second year.

    asked on June 11, 2015
  89. Maths

    A football match between United and City is watched by 24 000 spectators. Of the 24 000 spectators, 14 112 support United and 8208 support City. The rest of the spectators are neutrals who support neither team. a.Work out the percentage of the 24 000

    asked on April 27, 2015
  90. Maths

    In a sale of electrical equipment, the price of all goods is reduced by . Work out the sale price of the following. a A DVD player which normally costs £88 b A portable audio player which normally costs £150 c A laptop computer which normally costs £986

    asked on April 27, 2015
  91. Maths

    Ranee keeps £360 in a savings account for a year. At the end of the year she gets £13.50 in interest.Work out the interest rate on the account.Give your answer as a percentage. What's the answer guys and girls

    asked on April 27, 2015
  92. Entrepeurnuership

    which of the following companies is the easiest type to set up sole proprietorship LLC C corporation S corporation

    asked on February 24, 2015
  93. entrepreneurship

    A trade mark can help your company do what Organize itself differentiate it self buy and sell itself track inventory

    asked on February 24, 2015
  94. Algebra please help

    Pain says she should get $3 discount on the price of each shirt and a $3 discount on the price of each pair of jeans. Part 1 Write and simplify an expression to find the amount she would pay if this is true. Part 2 why are the amounts Pani pays in a and b

    asked on January 7, 2015
  95. Math 1

    The number 2 is chosen to begin a ladder diagram to find the prime factorization of 66. What other numbers could have been used to start the ladder diagram for 66? How does starting with a different number change the diagram?

    asked on January 5, 2015
  96. math

    What is the product written in scientific notation? (2.6 × 10–4)(2.2 × 108)

    asked on December 17, 2014
  97. Math

    Solve using the annihilator method Y"-8y'+20y=5xe^(4x) sin (2x)

    asked on November 25, 2014
  98. Health

    a boy notices a special needs student sitting by himself during recess. How can he get the student involved in a meaningful way? a- coach one of the teams b- be the all time referee c- the game be modified to allow for 2 goalies d- the game be played by

    asked on March 21, 2014
  99. Science

    What type of a bond is a metal cation likely to form?

    asked on March 18, 2014
  100. trigonometry

    Use a sum-to-product formula to rewrite cos5w+cos2w as a product.

    asked on March 18, 2014


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