Please help

Popular questions and responses by Please help
  1. math

    Can someone please help me/ Sal's Sandwich Shop sells wraps and sandwiches as part of its lunch specials. The profit on every sandwich is $2 and the profit on every wrap is $3. Sal made a profit of $1,470 from lunch specials last month. The equation 2x +

    asked on October 24, 2015

    Three people play a game of "nonconformity": They each choose rock, paper, or scissors. If two of the three people choose the same symbol, and the third person chooses a different symbol, then the one who chose the different symbol wins. Otherwise, no one

    asked on November 25, 2012

    1. A rectangular package to be sent by a postal service can have a maximum combined length and girth (perimeter of a cross section) of 108 inches. Find the dimensions of the package of maximum volume that can be sent. (Assume the cross section is square.)

    asked on October 17, 2014

    The highest recorded waterfall in the world is found at Angel Falls in Venezuela. Its longest single waterfall has a height of 807 m. If water at the top of the falls is at 16.7°C, what is the maximum temperature of the water at the bottom of the falls?

    asked on November 26, 2012
  5. chemistry

    Ima Chemist found the density of Freon-11 (CFCl3) to be 5.58 g/L under her experimental conditions. Her measurements showed that the density of an unknown gas was 4.38 g/L under the same conditions. What is the molar mass of the unknown?

    asked on November 1, 2014
  6. PHYSICS 2

    Two resistors have resistances R(smaller) and R(larger), where R(smaller) < R(larger). When the resistors are connected in series to a 12.0-V battery, the current from the battery is 1.99 A. When the resistors are connected in parallel to the battery, the

    asked on January 25, 2013
  7. Biology

    What are two traits of an information source that may indicate the information given is scientifically unreliable? Answer: peer review does not necessarily indicate that the other field expert reviews are in agreement with conclusions of the original

    asked on August 28, 2014
  8. Math

    I am terrible at ellipse The base of an auditorium is in the form of an ellipse 200ft long and 100 ft wide. A pin dropped near one focus can clearly be heard at the other focus. Determine the distance between the foci to the nearest tenth of a foot. Show

    asked on December 14, 2017
  9. Maths

    Around a circle i place 64 equally spaced points, so that there are 64x63 divided by2=2016 possible chords between these points. I draw some of these chords, but each chord cannot cut across more than one other chord. What is the maximum number of chords I

    asked on December 3, 2016

    One night the King couldn't sleep, so he went down into the Royal kitchen, where he found a bowl full of mangoes. Being hungry, he took 1/6 of the mangoes. Later that same night, the Queen was hungry and couldn't sleep. She, too, found the mangoes and took

    asked on September 21, 2011
  11. Algebra

    John is thinking about buying a house for $179,000. The table below shows the projected value of two different houses for three years. Number of years 1 2 3 House 1 (value in dollars) 186,160 193,606.40 201,350.66 House 2 (value in dollars) 190,000 201,000

    asked on August 19, 2019
  12. chemistry

    Examine the statement. Substances dissolve through three processes: I. ionization II. dissociation III. dispersion Which of the answer choices correctly lists the dissolving processes that change the identity of a substance? I and II II and III I,II and

    asked on September 15, 2017
  13. physics

    At most, how many bright fringes can be formed on either side of the central bright fringe when light of wavelength 656 nm falls on a double slit whose slit separation is 3.45 × 10-6 m?

    asked on March 28, 2013
  14. chemistry

    Which of the statements correctly describes the reactivity of noble gases, according to the octet rule? They have eight electrons in their valence shell, so noble gases are very unreactive. They have eight electrons in their valence shell, so noble gases

    asked on August 29, 2017
  15. math

    The measure of angle A is 124 degrees. What is the correct classification for angle A? a. acute b. right c. obtuse d. straight I'm pretty sure it's c. Right?

    asked on May 22, 2016
  16. english-macbeth

    in Act I, Scene iii, line 19 the witches say "I'll drain him dry as hay" I have to explaion this quotation but i don't quite undertsand what it means. Please help! this similie means: this is a metaphor that simply means that whatever they are "draining"

    asked on September 21, 2006
  17. chemistry

    Examine the scenario. A magnesium (Mg) atom gives one electron to two atoms of another element, and takes on a 2+ charge. The two atoms of the other element each form a 1− charge. As a result, the magnesium ion and the two ions of the other element

    asked on August 30, 2017
  18. Math

    Maya has 120 caramel apples to sell. Each caramel apple is covered with one topping. 1/5 of the caramel apples are covered with peanuts. 1/3 are covered with chocolate chips. 3/10 are covered with coconut. The rest are covered with sprinkles. How many

    asked on April 7, 2019
  19. Biology

    An animal cell that is surrounded by fresh water will burst because osmotic pressure causes... A. water to move into the cell B. water to move out of the cell C. solutes to move into the cell D. solutes to move out of the cell

    asked on September 4, 2018
  20. Mechanical behavior

    The television coverage of the World Series showed several remarkable slow-motion views of the deflection of the bat as it hit the ball. Major league wood baseball bats are made of ash. A typical major league bat has a length of 0.95m and a tapering

    asked on November 11, 2015
  21. Math

    1: Classify the quadrilateral using the name that best describes it I tried posting it but it didn't work 2: which statement is a true statement 3: which statement is a true statement 4: Which property is not a characteristic of a polygon 5: Which figure

    asked on January 19, 2018
  22. chemistry

    Examine the scenario. Chemical Reaction A and Chemical Reaction B involve the same two reactants. Chemical Reaction A is performed in a hot container, while Chemical Reaction B is performed in a cold container. Which of the answer choices correctly

    asked on September 5, 2017
  23. psychology

    Regarding eyewitness testimony, which of the following statements is TRUE? A. Most victims do not have an adequate weapon focus B. Victims certain of their testimony are usually more accurate C. Eyewitness testimony is generally very accurate D. Perception

    asked on January 22, 2016
  24. algebra 1

    Which of the following options results in a graph that shows exponential growth? a) f(x) = 0.4 (0.2) ^x b) f(x) = 4(0.98)^x c) f(x) = 0.7(5)^x d) f(x) = 5(4) ^-x I think it is c, can you please help?

    asked on November 12, 2015
  25. Physics

    In a series RCL circuit the generator is set to a frequency that is not the resonant frequency. This nonresonant frequency is such that the ratio of the inductive reactance to the capacitive reactance of the circuit is observed to be 4.91. The resonant

    asked on February 22, 2013
  26. chemistry

    For the reaction N2O4(g) ---> 2NO2(g) ,which of the following disturbances will cause an increase in NO2(g) concentration? 1. a decrease in temperature 2. removal of some N2O4(g) 3. need H for the reaction to predict 4. an increase in temperature 5. an

    asked on March 28, 2012
  27. chemistry

    Which way of dissolving does NOT change the chemical identity of the solute? disintegration dissociation ionization dispersion is it a?

    asked on September 12, 2017
  28. chemistry

    CaCl2(aq)+ NaHCO3(aq) =CO2(g)+ CaCO3(aq)+ NaCl(aq) +H2O(l) could some one explain to me how to balance the equation? please

    asked on September 7, 2017
  29. stats

    Question 5 of 10 Why are partial regression coefficients necessary in multiple regression? (Points : 1) Multiple variables each provide some of the same information. Each variable involved contributes a unique error component. Each variable involved is

    asked on July 20, 2014
  30. Algebra

    1. What is the shape of the bases for the following polyhedron? A. Triangle B. Square C.rectangle D. Circle 2. What is the best name for the given solid figure? A. Rectangular pyramid B.rectangular cone C. Rectangular prism D. Rectangle 3. How many lateral

    asked on February 12, 2018
  31. chemistry

    Examine the false statement. Weak acids always have a high pH. Select the rewording that makes the statement true strong acids always have a high pH weak acids always partially dissociate strong acids always have a low pH weak acids always fully dissociate

    asked on September 14, 2017
  32. physics

    The human lungs can function satisfactorily up to a limit where the pressure difference between the outside and inside of the lungs is 1/21 of an atmosphere. If a diver uses a snorkel for breathing, how far below the water can she swim? Assume the diver is

    asked on September 10, 2015
  33. Math

    A heated piece of metal cools according to the function c(x)=(.5)^(x−9), where x is measured in hours. A device is added that aids in cooling according to the function h(x)=−x−2. What will be the temperature of the metal after five hours? -7 Degrees

    asked on October 8, 2014
  34. algebra

    Determine if each root is a rational or irrational number. Explain your reasoning. √36 3√78

    asked on March 3, 2020
  35. Math

    A boat on a river traveled from City A to City C with a stop at City B. On the first part of the​ trip, the boat traveled at an average speed of 10 miles per hour. From City B to City C the average speed was 15 miles per hour. The entire trip covered 100

    asked on February 23, 2020
  36. Language Arts

    Which of the following words best describes Mr. Birkway? a. adoring b. enthusiastic c. unrealistic d. outgoing I think it's D. (This is based on the Novel Walk Two Moons.)

    asked on June 8, 2016
  37. Easy Math

    Draw a line with 3 distinct points on it. Label each with a different letter. How many different rays can you name using only three given points? a. 8 b. 6 c. 4 d. 2 Not quite sure. Could the answer possibly be four (c.)?

    asked on May 22, 2016
  38. history

    1. what impact did the education improvement act of 1984 have on south carolina a. South carolina teachers were paid the most in the southeast b. the state's schools were ranked the lowest in the nation c. fewer students took high school exit exams d. the

    asked on May 16, 2016
  39. physics

    A ballet student with her arms and a leg extended spins with an initial rotational speed of 0.90rev/s . As she draws her arms and leg in toward her body, her rotational inertia becomes 0.80 kg⋅m2 and her rotational velocity is 4.1rev/s . Determine her

    asked on March 9, 2015
  40. help please

    Devon's target heart rate zone is 140bpm—177bpm. Julian's target heart rate zone is 148bpm—181bpm. They stop running and take their pulse, and both count the heart rate at 173bpm. If they decrease their heart rates by 20bpm, who will be in his THR

    asked on October 5, 2014
  41. Physics

    A student is reading a lecture written on a blackboard. The lenses in her eyes have a refractive power of 59.82 diopters, and the lens-to-retina distance is 1.686 cm. (a) How far is the blackboard from her eyes? (b) If the writing on the blackboard is 4.81

    asked on March 24, 2013
  42. Math-geometry

    . If a spherical Triangle on Earth has an excess of 30 degrees, find the area of this spherical triangle measured in square miles. b. If a spherical triangle on the moon has an excess of 30 degrees, find the area of this spherical triangle in sqare miles.

    asked on March 9, 2013
  43. Calculus First Derivatives

    If f(2) = 2.5 and f'(2) = -2.5, then f(2.5) is approximately... I have no idea how to do this without an equation.

    asked on May 31, 2012
  44. physics

    A ball player wishes to determine her pitching speed by throwing a ball horizontally from an elevation of 3.0 m above the ground. She sees the ball land 15 m down the range. What is the speed of the ball as it leaves her hand?

    asked on November 28, 2010
  45. Math

    Jason has already used 3 1/1 cans of paint painting furniture. He is painting chairs that use 8 1/1 cans of paint. Let the total cans of paint used be represented by p. Let the number of chairs painted be represented by c. An equation that represents this

    asked on February 11, 2019
  46. English

    roxie 1. Choose the answer that best matches the word in italics. Use context clues to determine the meaning of the word, if necessary. The decorations were reminiscent of autumn leaves. (1 point) leftovers made reminders symbolic 2. Choose the answer that

    asked on November 7, 2016
  47. Physical Science

    What is the density of a rectangular block that has a mass of 500g and a volume of 50cm3? what i came up with was 1000. i feel like im wrong though. can anyone please help me.

    asked on March 24, 2016
  48. Mechanical Behavior of Materials

    Determine the creep compliance J(t) of a material that responds like: a) an elastic spring with Young's modulus E J(t): b) a viscous dashpot with viscosity η as a function of time t) J(t): c) the Maxwell model (E for spring, and η for dashpot as a

    asked on November 14, 2015
  49. Physics

    A frisbee is thrown horizontally with a speed of 12 m/s. If the frisbee moves a horizontal distance of 15 m, how long will it stay in the air?

    asked on March 7, 2015
  50. social studies

    1. During the War of 1812, the Americans were fighting for a) self-government b) freedom of the seas c) freedom from England Answer is B 2. The Americans were most successful on a) sea b) Lake Champlain and Lake Erie c) on land Answer: B 3. The English

    asked on May 7, 2014
  51. chemistry

    Liquid nitrogen, which has a boiling point of 77 K, is commonly used to cool substances to low temperatures. How much energy must be removed from 1.4 kg of gaseous nitrogen at 77 K for it to completely liquefy? Assume the latent heat of liquid nitrogen is

    asked on April 25, 2012
  52. chemistry

    For the system H2(g) + CO2(g) H2O(g) + CO(g) at equilibrium, the addition of H2(g) would cause (according to LeChatelier’s principle) 1. more H2O(g) and CO(g) to form. 2. only more CO2(g) to form. 3. only more H2O(g) to form. 4. no change in amounts of

    asked on March 28, 2012
  53. Chemestry @

    A 27.6ml volume of chlorine gas is collected over water at 23 C and 750 torr. The mass of the gas is 78.4mg. The vapor pressure of water is 21 torr. a)what is the pressure of the chlorine gas? b) what volume does the chlorine gas occupy? c)How many moles

    asked on October 26, 2008
  54. Trig


    asked on September 26, 2019
  55. Math

    A Parabola has a vertex (-3,7) and one x intercept is -11. Find the other x intercept and the y intercept. How on earth do i do this

    asked on May 13, 2019
  56. science

    which of the following is a chemical change a.boiling water b.melting a cube of ice c.dissolving 10 grams of salt in water d.splitting water into hydrogen and oxygen my answer: c

    asked on January 7, 2019
  57. Science

    If you scratch a penny with an steel file, will the copper of the penny rub off on the file, or the steel (iron) of the file rub off on the penny? 12. What can we determine from the above experiment about the relative hardness of copper and steel. 13. What

    asked on March 17, 2018
  58. MATH

    Sally is evaluating some test papers. There are 80 multiple choice questions in the test. Students get two points for every correct answer and for every wrong answer or any question left blank, one point is deducted from the total score. Mick got 115

    asked on November 8, 2017
  59. chemistry

    Where does radioactivity come from? physical changes in atoms the nuclei of unstable isotopes chemical reaction the breaking of chemical bonds please help

    asked on September 8, 2017
  60. chemistry

    Lists how many valence electrons are shared, gained, or lost by each atom of the 6 compounds? N2 CCl4 SiO2 AlCl3 CaCl2 LiBr

    asked on August 31, 2017
  61. Math

    I don't understand this. on a blueprint, the length of a wall is 5 centimeters. if the actual length of the wall is 15 feet, what is the scale of the blueprint?

    asked on January 17, 2017
  62. Math

    Find the complement and supplement of the angle shown. The picture is of an acute angle that is measured 52 degrees. How am I supposed to find the complement and supplement of the angle? Please help.

    asked on May 23, 2016
  63. algebra

    the width of a poster board is 30 inches. using scissors you reduce the width of the poster board to 10 inches what is the scale factor of the dilation? a. 1/3 b. 1/10 c. 3 d.10

    asked on January 21, 2015
  64. Physics- Circuits

    In a series RCL circuit the generator is set to a frequency that is not the resonant frequency. This nonresonant frequency is such that the ratio of the inductive reactance to the capacitive reactance of the circuit is observed to be 5.53. The resonant

    asked on February 24, 2013

    Two wires have the same cross-sectional area and are joined end to end to form a single wire. The first wire has a temperature coefficient of resistivity of α1 =0.00603 (C°)-1 and a resistivity of 5.00 x 10-7Ω m. For the second, the temperature

    asked on January 26, 2013
  66. Math - logs

    the log(10^ -1)of 3.66 = of 9.86 = of -2.8 = please help. (the 10^-1 is the subscript to log)

    asked on January 20, 2013
  67. Physics

    When a driver brakes an automobile, the friction between the brake drums and the brake shoes converts the car's kinetic energy to thermal energy. If a 1750-kg automobile traveling at 28 m/s comes to a halt, how much does the temperature rise in each of the

    asked on November 26, 2012
  68. physics/optics

    Transpose the prescription -0.75DS/-3.25DCx30 to the toric form with a capstan-form surface which has a +2.50D base curve

    asked on November 26, 2012
  69. chemistry!

    What volume of solvent should be added to 36.8 g of CH3OH to produce a 0.500 M solution of CH3OH?

    asked on April 22, 2012
  70. chemistry

    In the reversible reaction in water solution NH3 + H2O NH4+ + OH− , what acts as a Bronsted-Lowry acid and what acts as a Bronsted-Lowry base? 1. H2O; NH4+ 2. H2O; OH− 3. OH−; NH4+ 4. NH3; H2O 5. OH−; H2O

    asked on April 3, 2012
  71. Math

    Solve the equation by the substition method. x-y=11 3x+10y=-6?

    asked on December 6, 2011
  72. Physics

    A Chinook (King) salmon (Genus Oncorynchus) can jump out of water with a speed of 6.75 m/s. If the salmon is in a stream with water speed equal to 1.65 m/s, how high in the air can the fish jump if it leaves the water traveling vertically upwards relative

    asked on September 11, 2010
  73. Math

    The dimensions of a pyramid are increased by 1100%. The percentage increase in surface area is The new dimensions are ___times the original dimensions, and the new surface area is ___times the original surface area. The increase in surface area is___%.

    asked on May 20, 2020
  74. Biology

    Which of the following lists structures from smallest to largest? A. Chromosome, supercoil, coil, nucleosome, double helix B. Chromosome, coil, double helix, nucleosome, supercoil C. Double helix, nucleosome, coil, super coil, chromosome D. Nucleosome,

    asked on September 11, 2018
  75. chemistry

    Which of the solvents will be most effective at dissolving a nonpolar gas like methane? water, a polar solvent solid mercury hexane, a nonpolar solvent solid copper is it a?

    asked on September 15, 2017
  76. chemistry

    How does the saturation of a solution affect crystal formation?

    asked on September 14, 2017
  77. chemistry

    Which of the following solvents would most effectively dissolve a nonpolar gas like methane? a polar solvent at 10°C a polar solvent at 35°C a nonpolar solvent at 35°C a nonpolar solvent at 10°C is it a?

    asked on September 13, 2017
  78. social studies

    What is a reason that market prices are not always the same as equilibrium prices? A) Market prices are often set by buyers rather than by sellers. B) Supply and demand are not well-understood by business owners. C) The equilibrium is not always the most

    asked on April 13, 2017
  79. science

    The work of which scientist(s) helped to explain light's ability to propagate through a vacuum? A. Maxwell ==B. Davisson and Germer C. Fresnel, Fraunhofer, and Arago D. Newton An object that has a height of 0.4 meter is placed at a distance of 0.7 meter

    asked on February 2, 2017
  80. english

    Which of the following sentences contains an action verb? 1)Brad looks upset today. 2)Brad drove to the zoo with us.+++ 3)The animals seem very active today. 4)Our friend appeals happy now. I think it is number 2?

    asked on December 5, 2016
  81. Chemistry

    The iodine-131 nuclide has a half-life of 8 days. If you originally have 625-g sample, how many grams will you have after 2 months(approximately 64 days)?

    asked on November 2, 2016
  82. Chemistry

    The cesium-131 nuclide has a half life of 30 years. After 90 years, about 6g remain. What is the original mass of the cesium-131 sample?

    asked on November 2, 2016
  83. Geography

    which of the following was a belief of the quakers that set them apart from ither religious groups that settled in the american colonies? A. Quakers believed that all people are equal in God's eyes B. Quakers believed in freedom of religion C. Quakers

    asked on October 4, 2016
  84. Math

    If an object is propelled upward fom a height of s feet at an initial velocity of v feet per​ second, then its height h after t seconds is given by the equation he=−16t squared + vt + ​s, where h is in feet. If the object is propelled from a height

    asked on September 13, 2016
  85. math PsyDAG

    write the result in scientific notation (1.1 * 10^-5)(3 * 10^-2) a. 4.1 *10^-7 b. 4.1 *10^10** c. 3.3 *10^-7 d. 3.3 *10^10

    asked on May 27, 2016
  86. History

    Which of these indicated that the Tang Dynasty had lost the Mandate of Heaven? a. military defeats, rebellions, and economic troubles b. earthquakes, economic troubles, and isolationism c. rebellions, mass migrations, and military dictators

    asked on May 25, 2016
  87. History

    Which pair of ancient civilizations were ruled by dynasties? a. China and Egypt b. China and the Indus Valley c. the Indus River Valley and Mesopotamia d. Egypt and Mesopotamia I'm pretty sure its a.

    asked on May 17, 2016
  88. math

    In a jar there are 4 red marbles 5 green marbles and 7 blue marbles. 1 what us the probability of selecting a red marble replacing it and then selecting a blue marble 2 What is the probability of selecting a red marble setting it aside and then selecting a

    asked on December 17, 2015
  89. Mechanical behavior

    An atomic force microscope cantilever, of rectangular cross section, has a length, l, of 200μm, a width, b, of 20μm and a depth, h, of 1μm. It is made of silicon nitride, which has a Young's modulus, E, of 300GPa. What is the maximum force that can be

    asked on November 11, 2015
  90. English

    What sentences are compound or complex? 1.He, passionate, studious, austere, and having already a bride in his Art; she a maiden of rarest beauty, and not more lovely than full of glee; all light and smiles, and frolicsome as the young fawn; loving and

    asked on October 9, 2015
  91. Geometry

    How to put each circle in standard form? 1. Center of the line 5x-3y=12 and tangent to both axes.(first quadrant circle only). 2.passes through (-3,22) and tangent to the y axis at (0,19) 3.diameter ab with a (4,10) and b (8,14) 4. Center (6,10) tangent to

    asked on September 22, 2015
  92. art

    1. during which time period were artists keenly interested in using the golden ratio in their paintings a.Baroque period b.oriental period c.futuristic period d.renaissance period 2. what is the best definition for the term visual composition a. a

    asked on February 12, 2015
  93. Physics

    1.) A tennis ball (mass = 57 grams) is held directly above a basketball (mass = 624 grams)that is held 4.7 meters off the ground. Both are dropped simultaneously. Assuming an elastic collision, how high above the ground does the tennis ball reach after

    asked on December 16, 2014
  94. Science

    Put the following in the correct order. Report results Determine if hypothesis is true Do background research Construct a hypothesis Collect data Analyze results and draw conclusions Design and implement an experiment State the problem / ask questions

    asked on September 17, 2014
  95. PHYSICS 2

    Near San Francisco, where the vertically downward component of the earth's magnetic field is 6.8 x 10-5 T, a car is traveling forward at 17 m/s. The width of the car is 2.1 m. Find the emf induced between the two sides of the car. If positive charge

    asked on February 8, 2013
  96. geometry

    distint points a, b, c, d, e, and f are marked on a circle. How many triangles can be formed using these points as vertices?

    asked on January 14, 2013
  97. Science

    Well water in karst areas is often very hard. What is the role of chemical weathering in producing hard water in aquifers?

    asked on March 7, 2012
  98. Math

    Solve the equation by the substition method. x-y=11 3x+10y=-6?

    asked on December 6, 2011
  99. US History

    How did the British mercantlism prevent the economic development of the colonies? A.) The colonies were process to export their products to Great Britain only, thus limiting development. B.) British laws discouraged the growth of manifacture and forced

    asked on October 2, 2011
  100. vocab

    What does irrevelent mean?

    asked on September 21, 2011


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