Popular questions and responses by Maria
  1. math

    A​ student's course grade is based on one midterm that counts as 15​% of his final​ grade, one class project that counts as 15​% of his final​ grade, a set of homework assignments that counts as 40​% of his final​ grade, and a final exam that

    asked on February 17, 2019
  2. math

    In an isosceles triangle, the perimeter is 75 cm and one of the sides is 25 cm. Find all its sides. Can you find all angles of the triangle? Explain your answer.

    asked on January 28, 2017
  3. PHI 105 critical thinking and problem solving

    explaining the relationship between informative, explanatory and persuasive statements and critical thinking

    asked on December 19, 2011
  4. calculus

    A rectangular beam is cut from a cylindrical log of radius 25 cm. The strength of a beam of width w and height h is proportional to wh2. (See Figure 4.70.) Find the width and height of the beam of maximum strength.

    asked on November 1, 2011

    A 5.00-kg box slides 7.00 m across the floor before coming to rest. What is the coefficient of kinetic friction between the floor and the box if the box had an initial speed of 3.00 m/s?

    asked on March 18, 2014
  6. science

    A person drive an automobile with a mass of 450 kilograms at a velocity of 26 meters per second. The driver accelerates to a velocity of 30 meters per second. The difference in the automobile's kinetic energy is how many joules?

    asked on November 18, 2015
  7. math

    A rope goes from one building to another. The distance between the buildings is 10m, and the rope is tied at each building at a point 8m and 4m from the ground. Find the length of the rope.

    asked on February 11, 2017
  8. chemistry

    Calculate the grams or milliliters of solute needed to prepare the following solutions. 1.)75. g of a 7.0 % (m/m) KCl solution 2.) 1250 mL of a 8.0 % (m/v) NH4Cl solution 3.) 270. mL of a 15.0 % (v/v) acetic acid solution I really just need to know how to

    asked on July 17, 2016
  9. statistics

    A service station has a pump that distributes diesel fuel to automobiles. The station owner estimates that only about 3.2 cars use the diesel pump every 2 hours. Assume the arrivals of diesel pump users are Poisson distributed. a. What is the probability

    asked on March 19, 2013
  10. statistics

    A new extended-life light bulb has an average service life of 750 hours, with a standard deviation of 50 hours. If the service life of these light bulbs approximates a normal distribution, about what percent of the distribution will be between 600 hours

    asked on January 9, 2012
  11. chemistry

    Solubility (g/100gH2O) Substance 20∘C 50∘C KCl 34.0 42.6 NaNO3 88.0 114.0 C12H22O11 (sugar) 203.9 260.4 Using the above table, determine whether each of the following solutions will be saturated or unsaturated at 50 ∘C. 1.) Adding 19.7 g KCl to 35.0

    asked on July 17, 2016
  12. Physics

    Jason works for a moving company. A 95 kg wooden crate is sitting on the wooden ramp of his truck, the ramp is angled at 11 degrees. What is the magnitude of force, directed parallel to the ramp, that he needs to get it to start moving up the ramp? What is

    asked on August 25, 2019
  13. Geometry

    The distance from the center of a square to its side is 4 yd. Find the perimeter of the square. if you post the answer it would be a big help

    asked on April 20, 2017
  14. English

    I. Violent video games like Grand Theft Auto are a perpetual sources of controversy. II. After Atari's E.T. the Extra-Terrestrial video game flopped with consumers, 700,000 unsold cartridges were buried in a landfill in Alamogordo, New Mexico. III. The CIA

    asked on July 31, 2020
  15. chemistry

    What volume of 0.10 M NaOH can be prepared from 250. mL of 0.30 M NaOH? A) 0.075 L B) 0.25 L C) 0.75 L D) 0.083 L E) 750 L

    asked on July 15, 2016
  16. math

    A group of people were asked if they had run a red light in the last year. 325 responded "yes", and 294 responded "no". Find the probability that if a person is chosen at random, they have run a red light in the last year.

    asked on November 8, 2015
  17. Chem (HELP ASAP)

    Phenol C6H5OH partially dissociates in water as shown C6H5OH + H2O --> H3O+ + C6H5O- If Ka is 1.6*10^-10 and the concentration of H3O and C6H5O are both 1.0*10^-5 M at equilibrium, what would be the concentration of phenol?

    asked on June 8, 2010
  18. physics

    Two identical containers are open at the top and are connected at the bottom via a tube of negligible volume and a valve which is closed. Both containers are filled initially to the same height of 1.00 m, one with water, the other with mercury, as the

    asked on December 6, 2010
  19. Algebra

    What is the value of the y-coordinate of the solution to the system of equations? X + 2y = 4 -2y - 3y =9

    asked on July 22, 2020
  20. Pre Calculus

    Two forces with magnitudes of 150 and 75 pounds act on an object at angles of 30° and 150°, respectively. Find the direction and magnitude of the resultant force. Round to two decimal places in all intermediate steps and in your final answer. Having lots

    asked on August 18, 2016
  21. physical sicence

    If a force gives a 2-kg object an acceleration of 1.6 m/s2, what acceleration does this same force give to an 8-kg object?

    asked on October 12, 2012
  22. Algebra


    asked on July 15, 2020
  23. Chemistry

    So this is a three part question. I solved the first part correctly but I need help with the second and third. Q: The dissociation equilibrium constants for the protonated form of of alanine (a diprotic amino acid, H2X+)are Ka1 = 4.6 x 10^-3 and Ka2 = 2.0

    asked on May 9, 2017
  24. Math

    How many of the 28 students in Andy's class are boys, if 4/7 are girls?

    asked on October 9, 2011
  25. algebra

    Simplify the expression. Assume all variables represent nonzero real numbers (x^5)^-10

    asked on July 26, 2009
  26. Geometry

    Given: ΔABC, AB = BC Perimeter of ΔABC = 50 Perimeter of ΔABD = 40 Find: BD BD is the altitude and I got 15, 15+20+5=40 20+20+10=50

    asked on May 8, 2017
  27. business and finance

    Mel’s Furniture received an invoice dated September 27 for five bedroom sets at $3,000 each. The invoice indicated a trade discount of 5/8/3. The seller of the furniture prepaid the freight of $200. Terms were 2/10 EOM. Assuming Mel pays on November 2,

    asked on August 13, 2012
  28. Calculus--Please Help!

    A 13-foot ladder is leaning against a vertical wall. If the bottom of the ladder is being pulled away at a rate of 2 feet per second, how fast is the area of the triangle formed by the wall, the ground, and the ladder changing when the bottom is 12 feet

    asked on November 13, 2011
  29. Biology - population growth

    Two yeast cells were placed into a special container to which food was continually added, to keep it at a constant concentration. All other factors were set for optimal yeast growth (for example, temperature, oxygen, and pH). The population was sampled

    asked on January 24, 2019
  30. science

    Calculate the kinetic energy in joules of a body of mass 30kg at a velocity of 3ms-1

    asked on May 13, 2016
  31. College Physics

    A weightlifter has a basal metabolic rate of 64.6 W. As he is working out, his metabolic rate increases by about 650 W. (a) How many hours does it take him to work off a 450 Calorie bagel if he stays in bed all day? (b) How long does it take him if he's

    asked on November 24, 2014
  32. physics

    A shotputter accelerates a 7.3kg shot from rest to 14m/s. If this motion takes 2.0s what average power was developed?

    asked on February 28, 2011
  33. Chemistry

    What will the pH be if 15 mL of 0.1 M HCl are added to the buffer obtained by mixing 70 mL of 0.5 M CH3NH2 and 30 mL of 1.0 M CH3NH3+Cl-? (Kb for CH3NH2 is: 5.2 x 10-4 ) I'm having a hard time figuring out what to do first. is the ICE table come in handy

    asked on January 18, 2015
  34. Algebra 2 help...

    A half life of a certain radioactive is 36 days. An initial amount of the material has a mass of 487 kg. Write an exponential function that models the decay of this material. Find how much radioactive material remains after 5 days. Round your answer to the

    asked on January 10, 2014
  35. Cultural Anthropology

    The difference between transhumance and nomadic pastoralism is: (Points : 1) in transhumance people grow food and in nomadic pastoralism any domesticated plant food is acquired through trade. different types of animals are herded. in transhumance women do

    asked on October 21, 2012
  36. Pre-Calculus

    Find all solutions to the equation in the interval [0, 2pi) cos4x-cos2x=0 So,this is what i've done so far: cos4x-cos2x=0 cos2(2x)-cos2x (2cos^2(2x)-1)-(2cos^2(x)-1) No idea what to do next.

    asked on March 19, 2012
  37. Calculus

    A sphere with radius 1m has temperature 15 degrees C. It lies inside a con- centric sphere with radius 2m and temperature 25 degrees C: The temperature T(r) at a distance r from the common centre of the spheres satisfi es the di fferential equation:

    asked on August 8, 2011
  38. Physics

    Calculate the net charge on a substance con- sisting of a combination of 1.9 × 10^13 protons and 3.9 × 10^13 electrons. Answer in units of C.

    asked on March 7, 2011

    PLEASE HELP ME! THANK YOU! The table shows the percentage of the body composed of water for various vertebrates. ANIMAL % OF BODY COMPOSED OF WATER herring 67 Frog 78 Chicken 74 Kangaroo rat 65 A)Which animal would you expect to have the most concentrated

    asked on September 16, 2009
  40. College Chemistry

    What are the concentrations of Pb2+ and Cu2+ when the cell potential falls to 0.370 V? Given: A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+ half-cell at 25degrees C . The initial concentrations of Pb2+ and Cu2+ are 5.30×10−2 M and 1.60 M,

    asked on June 23, 2012
  41. chemistry

    determine the value of x for the following reaction: 4C + S8-> 4CS2 3.2 mol S8 yield x mol CS2

    asked on January 20, 2011
  42. Alegebra 1

    Urn A has balls numbered 1 through 7. Urn B has balls numbered 1 through 5. A ball is selected at random from urn A and then a ball is selected at random from urn B. What is the probability that a 4 is drawn from A followed by a 2 from B?

    asked on September 8, 2009
  43. algebra

    a 38 inch piece of steels is cut into three pieces so that the second piece is twice as long as the first piece, and the third piece is three inches more than four times the length of the first piece. find the lengths of pieces.

    asked on April 4, 2016
  44. Chemistry

    Write a balanced equation for an alpha particle from Gd-148

    asked on December 6, 2013
  45. trig.

    a person standing 100ft. from the base of the tree looks up to the top of the tree with an angle of elevation of 52. assuming that the persons eyes are 5ft above ground the ground how tall is the tree?

    asked on November 27, 2013
  46. Math

    Paul and Sammy take part in a race. The probability tha Paul wins the race is 9/35. The probability that Sammy wins the race is 26%. Who is more likely to win the race? Give a reason for your answer.

    asked on May 25, 2018
  47. physics

    An earthquake generates three kinds of waves: surface waves (L waves), which are the slowest and weakest; shear (S) waves, which are transverse waves and carry most of the energy; and pressure (P) waves, which are longitudinal waves and travel the fastest.

    asked on October 24, 2011
  48. Calculus

    If f is a continuous function with even symmetry and lim x→∞ f(x)=10, which of the following statements must be true? I. lim x→∞ f(x)=10 II. there are no vertical asymptotes III. The lines y=10 and y= -10 are horizontal asymptotes a) I only b) II

    asked on December 4, 2018
  49. physics

    A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. this best demonstrates that: a) the carton of milk has no acceleration b) there is an action-reaction pair of forces c) gravity tends to

    asked on March 24, 2018
  50. language arts

    which sentence best describes the employer in the original story "the ninny" and the employer in the adaptation the governess

    asked on May 10, 2016
  51. Chemistry

    Which ion has larger radius O2- or F 1-?why?

    asked on December 5, 2012
  52. Social Studies

    Maria ivanov has owned a successful clothing boutique chain for 20 years. Sha has gone into debt several times to expand her business.each time she paid off the debt in full sooner than expected. How will Maria's record affect the loans she is offered? She

    asked on May 5, 2017
  53. chemistry

    Calculate the energy (in kJ) required to heat 25 g of liquid water from 25oC to 100.oC and change it to steam at 100oC. The specific heat capacity of liquid water is 4.18 J/goC, and the molar heat of vaporization of water is 40.6 kJ/mol.

    asked on February 17, 2016
  54. Chemistry

    Describe the subatomic structure of the nucleus, including the structure of each nucleon. Describe the forces that hold the nucleus together Explain how beta emission works.

    asked on May 31, 2013
  55. URGENT!

    Ian admits to and corrects bookkeeping mistakes right away. Shin Lee reported a conflict-of-interest issue to her supervisor immediately. Who is acting ethically? A. Neither Ian nor Shin Lee B. Both Ian and Shin Lee C. Ian only D. Shin Lee only

    asked on March 15, 2013
  56. Probability PLEASE HELP

    A box contains exactly five chips, three red and two white. Chips are randomly removed one at a time without replacement until all the red chips are drawn or all the white chips are drawn. What is the probability that the last chip drawn is white ?

    asked on November 24, 2011
  57. physics

    A sinusoidal wave on a string is described by the equation y = (0.169 m) sin (0.713 x - 41.9 t), where x and y are in meters and t is in seconds. If the linear mass density of the string is 10.1 g/m ... a) ... the phase of the wave at x = 2.27 cm and t =

    asked on October 25, 2011
  58. Math

    A business finds that it has to increase its staff by 5% each year due to growth. After how many years would the size of their staff double?

    asked on May 7, 2018
  59. Social studies

    To which internatinal associations does the United States belong to?

    asked on October 12, 2016
  60. algebra

    A large swimming pool has a perimeter of 1,028 meters, this rectangular-shaped pool is 40 meters longer than 5 times its width. Find its dimensions. width m length m

    asked on March 25, 2016
  61. Chemistry

    What is the equilibrium equation for FeS(s) + 2H3O+(aq) - Fe2+(aq) + H2S(aq) + 2H2O(l) ? Explain if possible !

    asked on April 23, 2015
  62. math

    Let t be time in seconds and let r(t) be the rate, in gallons per second, that water enters a reservoir: r(t)=700−40t. a) For 0≤t≤30, when does the reservoir have the most water? b) For 0≤t≤30, when does the reservoir have the least water

    asked on September 13, 2013
  63. Math

    A Classroom bulletin board is 7 feet by 4 feet. If there is a picture of a student every 6 inches along the edge, including one in each corner, how many pictures are on the bulletin board? The teacher gave me the answer 40 but I don't know how.... Can you

    asked on September 10, 2013
  64. english

    Identify the type of subordinate clause in the following sentence. If we remember to brush our teeth, we will get fewer cavities. a)noun b)adjective c)adverb

    asked on January 6, 2013
  65. Business

    Identify which of the following sentences uses modifiers correctly; a) kurt and his hockey teammates nearly cooked two hundred pancakes for the breakfast fundraising event. d) Bridget decided to leave her career as an attorney and pursue acting during the

    asked on April 27, 2011
  66. chemistry

    balance this stoichiometric equation: SO2 + CaCO3 + O2 ------> CaSO4 + CO2

    asked on July 22, 2009
  67. Math

    if the bowl contains 5 red marbles 7 blue marbles and 8 white marbles what is the probability you will draw a red or blue marble? 5/20 15/20** 7/20 3/5

    asked on May 10, 2019
  68. Verbal reasoning

    If Tom is taller than Mary ,and Mary is taller than Ann ,who was the shortest ?

    asked on June 7, 2017
  69. PLEASE HELP !!

    Which of the following would require a cash receipt? A. Credit memo B. Purchase order C. Check D. Refund

    asked on March 15, 2013
  70. math

    Best Rentals charges a daily fee plus a mileage fee for renting its cars. Barney was charged $120 for 3 days and 300 miles, while Mary was charged $210 for 5 days and 600 miles. What does Best Rental charge per day and per mile?

    asked on August 27, 2012
  71. Chemistry

    The pH of a 0.002 50 mol/L solution of benzoic acid is 3.65. Calculate the Ka for benzoic acid.

    asked on December 20, 2011
  72. Math

    Joe keeps all his socks in one drawer. He has 7 blue socks and 9 brown socks. If he reaches in the drawer without looking, what is the least number of socks he can take out to be sure of getting a pair of the same color?

    asked on October 9, 2011
  73. chemistry

    On average, earth's crust contains about 8.1% aluminum by mass. If a standard 12-ounce soft drink can contains approximately 15.0g of aluminum, how many cans could be made from one ton of the Earth's crust?

    asked on January 17, 2011
  74. physics

    if you wished to warm 100 kg of water by 15 degrees celsius for your bath, how much heat would be required? (give your answer in calories and joules)

    asked on January 28, 2010
  75. MATH 157

    A spherical tree ornament is to be painted in bright colors. If the ornament has a diameter of 4 cm, how much paint is needed?

    asked on August 18, 2009
  76. Math

    What is the probability of not rolling a 5 on a die? 1/5 1/6 5/6** 1/4

    asked on May 10, 2019
  77. math

    List the sides of triangle ΔMNP in ascending order (shortest to longest) if: m∠M = 64°, m∠N = 48°, for this one i am not sure if your supposed to find the third angle and or the third side can you guys explain and show me the answer i got 132

    asked on January 28, 2017
  78. chemistry

    what are the isomers of chlorodibromobenzene

    asked on November 15, 2016
  79. History

    Which factor contributed to growing conflict over slavery from the 1820s through the 1850s? falling crop prices rapid industrialization rising tariff rates territorial expansion** If someone could please help me out a little. I'm pretty confused and this

    asked on February 28, 2016
  80. Math

    Find the 100th place to the right of the decimal point in the decimal expansion of 1/13.

    asked on May 30, 2015
  81. geometry

    Quadrilateral Math has been dissected into squares. The area of the red square is 64 square units and the area of the blue square is 81 square units. Determine the dimensions and the area of Quadrilateral Math?

    asked on October 25, 2014
  82. Algebra 2

    Which matrix represents the system of equations below? -10x-9y+13z=12 8x-7y-5z=15 5x+4y-6z=-12 a. -10,-9,13 8,-7,-5 5,4,-6 b.-10,-9,13 8,7,5 4,4,-6 c.-10,8,5 -9,-7,4 13,5,-6 d. 10,8,5 9,-7,4 13,5,-6

    asked on January 9, 2014
  83. algebra

    An herbalist has 30 oz of herbs costing $2 per ounce. how many ounces of herbs costing $1 per ounce should be mixed with these 30 ounces of herbs to produce a mixture costing $1.60 per ounce?

    asked on September 27, 2013
  84. Who is correct?

    Sarah says that overhead includes utility, rent, and salary costs. Jonas says that overhead includes liabilities and accounts payable.

    asked on March 15, 2013
  85. Statistics

    In your biology class, your final grade is based on several things: a lab score, scores on two major tests, and your score on the final exam. There are 100 points available for each score. However, the lab score is worth 15% of your total grade, each major

    asked on February 19, 2013
  86. physics

    With each cycle, a 2650-W engine extracts 2330 J from a thermal reservoir at 85.1°C and expels 1840 J into a thermal reservoir at 20.9°C. a) What is the work done for each cycle? b) What is the engine's efficiency? c) How much time does each cycle take?

    asked on January 1, 2012
  87. math

    log(4x+10)=3 simplify?

    asked on May 26, 2011
  88. physics

    Two electrostatic point charges of +50.0 μC and +50.0 μC exert a repulsive force on each other of 197 N. What is the distance between the two charges? The Coulomb constant is 8.98755 × 109 N · m2/C2. Answer in units of m.

    asked on March 16, 2011
  89. chemistry

    An explosive whose chemical formula is C3H6N6O6 produces water, carbon dioxide, and nitrogen gas when detonated in oxygen. write the chemical equation for the detonation reaction of this explosive.

    asked on January 17, 2011
  90. chemistry

    show that 1mg/L = 1g/m3

    asked on January 15, 2011
  91. statistics

    from a group of six people two individuals are to be selected at random. How many possible selections are there?

    asked on January 8, 2011
  92. english

    Identify the italicized part of the sentence. The main event will be a memory contest. Will is italicized

    asked on July 24, 2019
  93. Math

    Which is an example of the Symmetric Property? if 3x + 2 = a + 6, then a + 6 = 3x + 2 if a = b and b = 5, then a = 5 if y = 6, then y + 12 becomes 6 + 12 x + 2 = x + 2 *** 2. To properly use the Addition Property of Equality what number would have to be

    asked on May 10, 2019
  94. Calculus

    Rolle's theorem cannot be applied t the function f(x)= ln(x+2) on the interval [-1,2] because a) f is not differentiable on the interval [-1,2] b) f(-1)≠ f(2) c) All of these d) Rolle's theorem can be applied to f(x)= ln(x+2) on the interval [-1,2]

    asked on December 19, 2018
  95. Algebraic Expressions

    Terrance picked 54 apples. He kept a apples for himself and gave each of 6 friends an equal number of apples. How many apples did each friend receive?

    asked on August 11, 2018
  96. biochemistry

    What is the concentration of H+ in a solution of 0.2 M NaOH? i got [H+] = 5x10^-14, is this correct? all i did was [H+][OH-] = Kw

    asked on March 18, 2017
  97. calculus

    The region bounded by the given curves is rotated about the specified axis. Find the volume V of the resulting solid by any method. y = −x2 + 7x − 12, y = 0; about the x-axis

    asked on March 14, 2017
  98. check pls

    Grayson is designing a rectangular athletic field. On his scale drawing. the vertices of the rectangle are (4,5), (9,10), and (9,5). What are the coordinates of the fourth vertex? A. (4,9) B. (4,10) C. (5,10) D. (5,9) I think it's A. (4,9) Am i right?

    asked on April 30, 2015
  99. physics

    You're in an airplane that flies horizontally with speed 830km/h (230m/s ) when an engine falls off. Neglecting air resistance, assume it takes 35s for the engine to hit the ground. Find the height of airplane. Find the horizontal distance that the

    asked on March 26, 2015
  100. Science

    a reasonable estimate for the size of a cell's nucleus is a. 0.003 b. 3 mm c. 0.003m d. 3m

    asked on October 13, 2014


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