Most popular questions and responses by Harry
  1. Algebra

    Suppose you are researching the eating habits of people your age. What sampling method could you use to find the percent of students in your grade who eat five servings of fruit and vegetables each day? What is an example of a survey question that does not

    asked on June 14, 2018
  2. Physics

    A race driver has made a pit stop to refuel. After refueling, he leaves the pit area with an acceleration whose magnitude is 6.0m/s 2 . After 4.0s he enters the main speedway. At the same instant, another car on the speedway and traveling at a constant

    asked on January 6, 2010
  3. Math

    Suppose you are researching the eating habits of people your age. What sampling method could you use to find the percent of students in your grade who eat five servings of fruit and vegetables each day? What is an example of a survey question that does not

    asked on June 14, 2018
  4. Physics

    A horizontal force, F1 = 85 N, and a force, F2 = 18.4 N acting at an angle of θ to the horizontal, are applied to a block of mass m = 2.1 kg. The coefficient of kinetic friction between the block and the surface is μk = 0.2. The block is moving to the

    asked on October 9, 2014
  5. Calculus

    Given the table below for selected values of f(x), use 6 right rectangles to estimate the value of the integral from 1 to 10 of f(x)dx. Table: 1 3 4 6 7 9 10 4 8 6 10 10 12 16 The only problem I'm having with this is figuring out the values of f(2.5),

    asked on April 4, 2018
  6. Math/ Number sense

    Use the numbers shown. Make the sum of the numbers across equal the sum of the number down. 7 5 1 9 3

    asked on November 29, 2011
  7. college calc

    Give a formula for the function illustrated using a vertical shift of an exponential function. The two points marked on the graph are A=(−1,17) and B=(1,2). The red horizontal line is given by y=1, and is a horizontal asymptote of the function. What is

    asked on September 6, 2012
  8. Linear Algebra

    I need help please!! How many solutions does the system of equations have? 2x=-10y+6 and x+5y=3 a. one b. two c. infinitely many d. none y=4x+3 and y=4x+4 a. one b. two c. infinitely many d. none x-4y=12 and y=1/4x-3 a. one b. two c. infinitely many d.

    asked on March 13, 2014
  9. AP chemistry

    Liquid butane, C4H10, is stored in cylinders, to be used as a fuel. The normal boiling point of butane is listed as -0.5 C. (a) suppose the tank is standing in the sun and reaches a temperature of 35 C. Would you expect the pressure in the tank to be

    asked on October 28, 2012
  10. Maths

    A runner has four different pairs of shoes. If two shoes are selected at random, what is the probability that they will be a matching pair? Answer: 1/7 Thanks for any help

    asked on July 6, 2019
  11. Math

    Please Check My Answers!!! What is the type of conic section is given by the equation x^2-9y^2=900 and what is the domain and range? Answer: Type is hyperbola, Domain is all real values of x, not sure what the range is. Please explain how to find these

    asked on June 18, 2018
  12. Math

    Please Check My Answer: Find the probability that you throw a dart and land in the region labeled "G" Here is a link to the image: I can't place it in here, but if you google the question, the very first image that pops up (A square with different colors

    asked on June 18, 2018
  13. Trig

    Two people decide to find the height of an obelisk. They position themselves 25 feet apart in line with, and on the same side of, the obelisk. If they find that the angles of elevation from the ground where they are standing to the top of the obelisk are

    asked on September 10, 2014
  14. Math

    Insert the missing digits to make number sentence true _,_63-3,9_9=2,83-

    asked on October 25, 2017
  15. Art... check

    Which of the following is a convention Chinese artist Shen Zhou used in his brush paintings? He used only black ink to emphasize expressive brushstrokes. He painted several seated Buddha in the background. He painted flat, realistic figures to reflect

    asked on November 15, 2014
  16. Math

    Reasonableness. Use the clues to solve the. Riddle. I am between 24and34. You say my name when you count by twos from zero. You say my name when you count by fives from zero. What number am I? 20 21 22 23 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

    asked on November 22, 2011
  17. math

    semir, sarah and sung so decided to raise money for a local homeless shelter by working in a local deli. the deli agreed to donate to the shelter a portion of the profits from each meal the three sold. semir sold 3 times as many meals as sarah. sung sold 2

    asked on October 14, 2014
  18. Physics

    The diameter of the Moon is 3.78x10^6m. It subtends an angle of .00982 radians at the surface of Earth. How far is the Moon from Earth? (Please explain I can't wrap my head around this question.)

    asked on November 13, 2014
  19. Maths

    A balloon is inflated so that its increase in volume is at a constant rate of 10cm^3 s^-1. If its volume is initially 1 cm^3, find its volume after 3 seconds. Answer: 31 cm^3

    asked on April 29, 2019
  20. math

    Susie bought 5 kg of flour and 4 kg of sugar for $14.80.If 3/4kg of flour cost as much as 3/5kg of sugar,find the cost of 1kg of sugar.

    asked on April 6, 2015
  21. Math

    A eighteen-sided die is rolled three times. In how many ways can this happen? How would I solve this problem?

    asked on September 4, 2016
  22. Physics

    A telescope has an objective with a refractive power of 1.65 diopters and an eyepiece with a refractive power of 240 diopters. What is the angular magnification of the telescope?

    asked on March 26, 2018
  23. Physics

    Consider the equation v = (1/7)zxt2. The dimensions of the variables v, x, and t are [L/T], [L], and [T] respectively. The numerical factor 7 is dimensionless. What must be the dimensions of the variable z, such that both sides of the equation have the

    asked on October 16, 2015
  24. Health science

    Branches of health education

    asked on February 5, 2019
  25. Maths

    In Yahtzee, 5 dice are rolled. Find the probability of rolling at least one 6. Answer: 4651/7776 Thanks for any help

    asked on July 2, 2019
  26. physics

    What displacement must be added to a 50cm displacement in the +x-direction to give a resultant displacement of 85cm at 25 degrees

    asked on November 1, 2010
  27. chemistry

    enthalpy change^H is +23kJ mol-1 of phosphine (PH3) for the reaction 2P(s)red+3H2(g)---->2PH3(g) a) Calc. entropy change for this reaction. Explain how this information allows you to determine the spontaneity or non-spontaneity of this reaction at any temp

    asked on February 12, 2013
  28. Chemistry

    One enzyme- catalyzed reaction in a biochemical cycle has an equilibrium constant (K1) that is 10 times the equilibrium constant (K2) of a second reaction. If the standard Gibbs energy of the former reaction is - 300 kJ mol-1, what is the standard reaction

    asked on April 10, 2012
  29. Spanish

    Need help with FOUR Spanish questions @snra Escribe este verbo en el pasado: Hoy yo voy a la escuela. Ayer yo _______ a la escuela My Answer: fui Escribe este verbo en el pasado: Cada domingo, yo doy un paseo. Cada domingo, yo __________ un paseo. My

    asked on June 13, 2018
  30. math

    19 cars start a race. in how many ways can the top 3 cars finish

    asked on December 14, 2013
  31. Chemistry

    Calculate the percent purity of a sample of zinc metal if 325 mL of hydrogen gas is collected by water displacement at a temperature of 22.0 C and an atmospheric pressure of 745.0 mm Hg when 1.12 g of the sample is reacted with excess HCl: Zn + 2 HCl = H2

    asked on December 11, 2014
  32. Sound and music

    If the fundamental frequency for a 60-cm long guitar string is 500 Hz, what is the speed of the traveling waves?

    asked on March 15, 2011
  33. Math

    For questions 2 and 3, use a calculator to find the values of the inverse function in radians. sin^-1(0.65) 0.71 + 2pi n and –0.71 + 2 pi n 0.71 + 2 pi n and –3.85 + 2 pi n 0.86 + 2pi n and –0.86 + 2pi n –0.61 + 2pi n and 2.54 + 2 pi n

    asked on June 16, 2018
  34. Chemistry

    The fluoride ion concentration in a saturated solution of magnesium fluoride, MgF2, is 2.3 10-3 M. Calculate the value for the equilibrium constant.

    asked on May 5, 2014
  35. chemistry

    write the equation for copper(II) sulfate pentahydrate and ammonium sulfate forming: Cu(NH4)2(SO4)2*6H2O not sure how to balance it Check your question very carefully. Is this a question given to you by a teacher? yeah it is in a lab CuSO4.5H2O + (NH4)2SO4

    asked on November 6, 2006
  36. Maths

    A cone shaped candle whose height is 3 times its radius is melting at the constant rate of 1.4 cm^3 s^-1. If the proportion of radius to height is preserved, find the rate at which the radius will be decreasing when it is 3.7cm. Answer: -0.01

    asked on April 30, 2019
  37. statistics

    A company has four production sections viz., S1, S2, S3 and S4 which contribute 30%, 20%, 28% and 22% of the total output. It was observed that those sections respectively produced 1%, 2%, 3% and 4% defective units. If a unit is selected at random and

    asked on February 4, 2015
  38. Maths

    In a class of 30 girls, 13 are dancers and 23 are gymnasts. If 7 girls do both dance and gymnastics, what is the probability that a girl chosen at random does neither dance nor gymnsatics. Answer: 1/30 Thanks to anyone who helps

    asked on July 7, 2019
  39. Maths

    Two identical biased coins are tossed together, and the outcome is recorded. After a large number of trials it is observed that the probability that both coins land showing heads is 0.36. What is the probability that both coins land showing tails? Answer:

    asked on July 12, 2019
  40. Chemistry

    A 53.8-mg sample of sodium perchlorate contains radioactive chlorine-36 (whose atomic mass is 36.0 amu). If 29.6% of the chlorine atoms in the sample are chlorine-36 and the remainder are naturally occurring nonradioactive chlorine atoms, how many

    asked on June 21, 2016
  41. math

    Agus sold packets of sweets to Halim and Kairi in the ratio 8:13.He sold the sweets in 2-kg packets.What was the smallest possible mass of sweets Agus sold to both of them?

    asked on April 21, 2015
  42. Maths

    A set of 5 cards, each labeled with the letters A, B, C, D and E, is placed in a hat and two selected at random without replacement. Find the probability of getting D and E. Answer: 1/10 Thanks for any help

    asked on July 6, 2019
  43. maths

    There are 34 men and 32 women at a party. Of these, 13 men and 19 woman are married. If 2 people are chosen at random, find the probability that both will be men. Answer: 17/65 Thanks for any help

    asked on July 6, 2019
  44. Biology

    Zucchini cores placed in sucrose solutions at 27oC resulted in the following percent changes after 24 hours: % change in mass [Sucrose] 20 distilled water 10 0.2 M -3 0.4 M -17 0.6 M -25 0.8 M -30 1.0 M Graph the results and find the molar concentration of

    asked on October 11, 2007
  45. Mathematics

    A bullet is found embedded in the wall of a room 2.9 m above the floor. The bullet entered the wall going upward at an angle of 36.7°. How far from the wall was the bullet fired if the gun was held 1.1 m above the floor?

    asked on October 18, 2015
  46. Maths

    Two fair dice are thrown. If the first die thrown is a 3, what is the probability that the sum of the two dice is greater than 7? Answer: 1/3. Thanks for any help

    asked on August 3, 2019
  47. Chemistry

    The reaction of aqueous barium hydroxide and aqueous sodium sulfate is represented by the balanced net ionic equation. Ba2+(aq) + SO42-(aq) → BaSO4(s) Give the balanced ionic equation for the reaction. Include the states.

    asked on January 29, 2010
  48. English 2

    In "It Can't Be Helped," why does Mama destroy her dishes? a)She does not like the pattern on the dishes, which are chipped anyway. b)Most of the other dishes have been broken in the move. c)She doesn't want the dealer to take advantage of her family's

    asked on November 23, 2010
  49. Physics

    A flat disk 1.0 m in diameter is oriented so that the plane of the disk makes an angle of pi/6 radians with a uniform electric field. if the field strength is 589.0 N/C, find the electric flux through the surface. I know that Flux=(integral)|E|cos(theta)dA

    asked on February 3, 2015
  50. Reasonableness

    The flag that Nico waves has an odd number in the ones place and an even number in the tens place. RED flag 25- blue flag 14- yellow flag-32-green flag 6--oranges flag--17

    asked on November 2, 2011
  51. Maths

    A stone is dropped from a building 50 m high. Its acceleration at any time, t, can be approximated by the equation a = -10. How long does it take for the stone to hit the ground at the foot of the building? Answer: 3.16 s

    asked on May 26, 2019
  52. math

    Simplify the expression 8² +9(12÷3 x 2) -6 Explain each of your steps.

    asked on September 13, 2016
  53. physics

    A 475 gram box is given a push and it then slides up and back down a ramp with a 35.0° incline. The coefficient of friction is 0.30. (a) Determine the rate of deceleration as the box slides up the ramp. (b) Determine the rate of acceleration as the box

    asked on February 20, 2014
  54. Physics

    A force of 40 N is required to start a 5 kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? (b) If the 40 N force continues, the box accelerates at 0.70 m/s2. What is the

    asked on December 4, 2012
  55. Chemistry

    What volume will be required to contain a mixture of 0.547 mol of N2 and 0.547 mol of O2 at 1.11 atm and 22.1 degrees celsius?

    asked on March 20, 2012
  56. math

    A stone is dropped from a building 50 m high. Its acceleration at any time, t, can be approximated by the equation a = -10. How long does it take for the stone to hit the ground at the foot of the building? Can someone please help me with this. Thanks in

    asked on May 27, 2019
  57. Chemistry

    2NaN3(s) −> 2Na(s) + 3N2(g) . If 0.65 mol of NaN3 reacts, what mass of nitrogen would result? Answer in units of g. Step by step with answer please! I'm begging!

    asked on March 23, 2011
  58. physics

    Two identical mass-spring systems consist of 250-g masses attached to springs of spring constant 15 N/m. If one of them starts oscillating from its equilibrium position at time t = 0, how much later should the second one start so they oscillate out of

    asked on June 9, 2016
  59. Physics

    The brakes of an automobile are suddenly applied at the instant when its velocity is 20 m/s. If the automobile comes to a stop after 5 seconds, what is its acceleration?

    asked on January 11, 2016
  60. maths

    The rate of flow of water into a dam is given by R=500+20t L h^-1. If there is 15 000L of water initially in the dam, how much water will there be in the dam after 10 hours? Answer: 21 000L

    asked on April 29, 2019
  61. chemistry

    list the following substances in order of increasing molar entropy at 25'c. H2O(l), H2O(g), H2O(s), C(s), Ar (g) Explain your reasoning

    asked on February 12, 2013
  62. Chemistry

    Uranium-238 has half life of 4.51 * 10^9 years Uranium-234 has half life of 2.48 * 10^5 years Thorium-230 has half life of 8.0 * 10^4 years Radium-226 has half life of 1.62 * 10^3 years Lead-210 has half life of 20.4 years. The rate constant for the decay

    asked on March 20, 2012
  63. Math

    Find F(t) such that F'(t)= Sec^4 (t) and F (pi/4) = 0

    asked on November 23, 2018
  64. Math

    A satellite dish has a diameter of 32 inches and is 6 inches deep. If the antenna needs to be put at the focus of the parabola, where would the parabola be placed?

    asked on November 17, 2016
  65. Maths

    A spherical bath oil capsule dissolves in the bath so that its decrease in volume is proportional to its surface area. If its shape remains spherical as it dissolves, show that the radius of the capsule will decrease at a constant rate. Thanks to anyone

    asked on May 13, 2019
  66. physics

    A champion discus thrower throws a discus with an initial speed of 26 m /s. If the discus is thrown upward at an angle of 45o, what maximum height and what range will the discus attain? What is its time of flight? For the sake of simplicity, ignore the

    asked on November 22, 2017
  67. CAL-Critical points

    For the function F(x) = inx/x^2 , find the approximate location of the critical point in the interval (0, 5).

    asked on December 29, 2014
  68. Chemistry

    Aniline, C6H5NH2, is a weak base. If the hydroxide ion concentration of a 0.201 M solution is 9.2 10-6 M, what is the ionization constant for the base?

    asked on May 5, 2014
  69. Maths

    A quiz has 20 multiple choice questions, each with a choice of 4 answers. If Jay guesses an answer for each question at random, find the probability that he will score 75% on this quiz, correct to 2 significant figures. Answer: 0.000 003 4 Thanks for any

    asked on June 7, 2019
  70. algebra

    Solve the following system of equations. You will type your x value in the first part and the y value in the second part of the question. If the answer is no solution then type NS in both parts and if the the answer is infinite solutions then type I in

    asked on January 8, 2019
  71. chemistry

    A hydrate of strontium choloride contains 40.54% water. What is the formula of the hydrate ? SrCl2*xH2O. H2O = 40.54% SrCl2 = 100 - 40.54 = 59.46% Take 100 g sample. This gives us 59.46g SrCl2 and 40.54g H2O. Convert to mols. mols SrCl2 = 59.46/158.5 =

    asked on November 26, 2006
  72. Maths

    A circular lily pond is surrounded by a gravel walkway that is 4 m wide. Calculate the area of the walkway if the pond is 12 m in diameter.

    asked on August 28, 2014
  73. please hurry

    what is the square root of 0.31428 with explanation.by divison method.

    asked on May 20, 2013
  74. phys chem

    Calculate the Coulomb potential due to the nuclei at a point in a LiH molecule located 200 pm from the Li nucleus and 150 pm from the H nucleus. just doing exam review and got stuck on just this one, be great if I could get an answer.

    asked on April 9, 2012
  75. science

    what is the current prouce by a potential difference of 240 volts through a resistance of 0.2 ohms?

    asked on May 15, 2010
  76. History

    One main difference between the Articles of Confederation and the U.S Constitution was that the Articles were very weak and the people had more power than the government while the Constitution gave more power to the government. Are there any other main

    asked on October 23, 2008
  77. Maths

    If a rockets acceleration is given by a=-k/x^2, where x is the distance from the centre of the Earth, and if the rocket starts from rest at the surface of the Earth (radius 6400 km), find an equation for the velocity of the rocket in terms of x. Answer: v

    asked on May 14, 2019
  78. Maths

    The velocity of a particle is given by v= t / t^2+3 ms^-1. If the particle is initially at the origin, find its displacement after 10s, correct to 2 decimal places. Answer: 1.77 m

    asked on May 10, 2019
  79. Maths

    If (1+px)^n = 1 + 15x +90x^2 +... , find the values of p and n. Answer: p=3, n=5 Thanks for any help

    asked on April 27, 2019
  80. math

    An architect is designing an office building with n floors that will have an FM radio antenna 15.85m tall on its roof. Each floor of the building will be 3.9m high. Which equation can be used to find the total height, h, of the building in meters,

    asked on April 9, 2015
  81. CHEM

    Calculate the equilibrium constant for the weak base CH3NH2, if a solution of the base with an initial concentration of 7.05×10-4 M has a [CH3NH3+] of 0.000379 M (make an exact calculation assuming that initial concentration is not equal to the

    asked on April 26, 2009
  82. algebra

    Find the points of discontinuity and any holes. y=x^2-1/(x^2+3x+2) please and thank you y =(x^2-1)/((x+1)(x+2)) =(x-1)/(x+2) we cancelled the (x+1)/(x+1) which is 0/0 for x=-1 so in our simplified expression when x=-1 y = -2 There is a "hole" at (-1,-2) in

    asked on April 27, 2007
  83. algebra

    A coffee merchant sells a customer 3 lb of Hawaiian Kona at $9.75 per pound. The merchant's scale is accurate to within ±0.03 lb. By how much could the customer have been overcharged or undercharged because of possible inaccuracy in the scale? (Round your

    asked on February 10, 2015
  84. Math

    Why can't the slope of a line be expressed as a decimal or a fraction? The slope of a line should be expressed as a fraction. The formula is Rise over Run. Rise is how much further up u go and run is how much further across do u go. Does that answer your

    asked on October 27, 2006
  85. science

    A uniform solid sphere is placed on a smooth horizontal surface and a horizontal force F is applied on it at a distance h above the surface. The acceleration of the center?

    asked on December 27, 2015
  86. Physics C

    A charged particle is released from rest in a region that has a uniform electric field of magnitude 64.0 N/C. After traveling a distance of 0.500 m in this region, the particle has a kinetic energy of 0.880 J. The charge on the particle is _______ C

    asked on January 14, 2015
  87. physics

    model rocket is launched straight upward with an initial speed of 50.0 m/s. It accelerates with a constant upward acceleration of 1.00 m/s2 until its engines stop at an altitude of 130 m. (a) What is the maximum height reached by the rocket? m (b) How long

    asked on September 8, 2010
  88. Maths

    Find the area enclosed by the curves y=x^2 and x=y^2. Thank you to any who helps

    asked on March 4, 2019
  89. Physics

    Find the net force and the acceleration for the situation below. 30N 20N

    asked on February 19, 2014
  90. Ap chem

    Why does pf3 have dipole dipole internolecular forces? I thought it had dispersion...

    asked on February 12, 2014
  91. physics

    A 67.7 kg person jumps from rest off a 3.11 m-high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 1.04 m under the surface of the water. Determine the magnitude of the average force that the water exerts on

    asked on February 19, 2012
  92. Chemistry

    What is the balanced net ionic equation for the following reaction: 2 NH4Cl + Ba(OH)2 = 2H2O + BaCl2 + 2 NH3 i got 2NH4^+ +2OH- = 2H2O + 2NH3 but it keeps telling me i'm wrong

    asked on November 13, 2010
  93. reading

    Listening to a CD has been the method of listening to music for the last 20 years. Now downloading on Itunes and sharing MP3 files has become the wave of the future. Do you think this technology is a revolution and advancement in music or is it a downfall

    asked on October 24, 2007
  94. Math

    Which coins would you use to make $0.28? Write two ways

    asked on October 1, 2012
  95. Chemistry

    Ik this has been answered, but doesn't the copper oxide have something to do with it? And could you explain it in simpler terms? I'm just confused because you said forget the copper oxide, but your using it somehow, what puzzles me is the carbon dioxide,

    asked on February 23, 2014
  96. Chemistry

    Phosphorous trichloride (PCl3) is produced from the reaction of white phosphorous (P4) and chlorine: P4(s) + 6Cl2(g) --> 4 PCl3(g) . A sample of PCl3 of mass 280.7 g was collected from the reaction of 70.86 g of P4 with excess chlorine. What is the

    asked on March 23, 2011
  97. physics help

    An electric circular saw is designed to reach its final angular speed, starting from rest, in 1.16 s. Its average angular acceleration is 375 rad/s2. Obtain its final angular speed.

    asked on November 19, 2010
  98. physics

    A hockey puck was moving at +22.8m/s. When it hit the goalie's glove, it showed down and came to a stop in +0.10m. a) How far was the player from the goalie if it took 0.30s to travel from the player's stick to the goalie's glove? b) How long did it take

    asked on November 25, 2018
  99. Chemistry

    N2(g) + O2(g) → N2O5(g) What volume of oxygen gas reacts to yield 750.0 cm3 of N2O5? The reaction conditions are 350°C and 2.50 atm pressure

    asked on February 2, 2014
  100. 7th grade math

    consider the inequality 2x+3≤-3. Find the set of all integer solutions of this inequality that are also solutions of the inequality 5x-2

    asked on October 22, 2014


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