Most popular questions and responses by sal
  1. AP Chemistry

    Write the formula for each of the following compounds, being sure to use brackets to indicate the coordination sphere. (b) bis(bipyridyl)cadmium(II) chloride (c) potassium tetrabromo(ortho-phenanthroline)- cobaltate(III) (d) cesium

    asked on December 29, 2017
  2. Art

    1. Which movie professional creates the storyboard? A. Screenwriter B. Production designer C. Director D. Graphic artist 2. How might a cinematographer create a believable scene in natures? A. Through research of plants and animals B. Through adjustment of

    asked on March 9, 2015
  3. science

    From the following: pure water solution of C12H22O11 (m=0.01) in water solution of NaCl (m=0.01) in water solution of CaCl2 (m=0.01) in water choose the one with the a) highest freezing point b) lowest freezing point c) highest boiling point d) lowest

    asked on October 5, 2010
  4. calculus

    A car leaves an intersection traveling east. Its position t sec later is given by x = t2 + t ft. At the same time, another car leaves the same intersection heading north, traveling y = t2 + 3t ft in t sec. Find the rate at which the distance between the

    asked on October 19, 2011
  5. Physics

    This question has been blowing my mind, and my teacher is offering no help whatsoever. Experiments performed on the wing of a hawkmoth (Manduca sexta) show that it deflects by a distance of = 4.9 mm when a force of magnitude = 3.2 mN is applied at the tip.

    asked on October 22, 2009
  6. Linear algebra

    If →u and →v are the vectors below, find the vector →w whose tail is at the point halfway from the tip of →v to the tip of →v−→u and whose head is at the point halfway from the tip of →u to the tip of →u+→v. Assume all vectors are in

    asked on September 22, 2018
  7. Language arts

    Which of the following events is part of the novels falling action? A. Paul reveres ride to Lexington B. Johnnys injury of his hand and need to find another trade C. Johnnys acceptance of Dr. Warrens offer to operate on his hand D. General gage and the

    asked on January 7, 2015
  8. linear algebra

    Find all values of x so that the triangle with vertices A=(−3, 1, x), B=(−3, 4, −2), and C=(−2, −2, 2) has a right angle at A.

    asked on September 26, 2018
  9. calculus

    Find the slope of the tangent line to the curve x^2+y^3=5x^2y+5 at the point (1,−1). Please help!

    asked on October 24, 2018
  10. algebra

    Write an expression in simplest form that represents the perimeter of the polygon. the measure of the sides are 3x, x + 10, 2x + 2, and 5x. Would the simplified expression be 11x + 12?

    asked on December 15, 2015

    I have 3 coins, They total less than 25 cents. I cannot make 15 cents. I can make 6 cents. What are my coins.

    asked on October 28, 2015
  12. Physics

    This is a very confusing question and I have no idea how to tackle it. - In a nuclear reactor, neutrons released by nuclear fission must be slowed down before they can trigger additional reactions in other nuclei. To see what sort of material is most

    asked on October 30, 2009
  13. Linear Algebra

    Find conditions on k that will make the matrix A invertible. To enter your answer, first select 'always', 'never', or whether k should be equal or not equal to specific values, then enter a value or a list of values separated by commas. A = −2 3 0 2 k 0

    asked on October 21, 2018
  14. psychology

    what is the difference between absolute continuity and differential continuity in regards to personality traits?

    asked on June 1, 2010
  15. physics

    A 53.0-kg person jumps from rest off a 12.0-m-high tower straight down into the water. Neglect air resistance. She comes to rest 3.00 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This

    asked on July 10, 2013
  16. physics

    A child starts from rest and slides down a snow-covered hill with a slope angle of 47° from a height of 1.8m above the bottom of the hill. The speed of the child at the bottom of the hill is 3.1m/s. Find the coefficient of kinetic friction between the

    asked on October 27, 2018
  17. calculus

    find the slope of the tangent line to the curve (sqrt 2x+4y) + (sqrt 4xy) = 9.16 at the point (1,5) dy/dx method implicit differantiation?

    asked on May 9, 2010
  18. linear algebra

    Let A be the matrix below and define a transformation T:ℝ3→ℝ3 by T(U) = AU. For the vector B below, find a vector U such that T maps U to B, if possible. Otherwise state that there is no such U. A = +3+3 −6 +1+3 −8 −3 0 −2 B = +6 0 −9 Not

    asked on November 4, 2018
  19. Chemistry

    for the reaction 2Na(s) + Cl2(g) -> 2NaCl(s), how many grams of NaCl could be produced from 103g of Na and 13L of Cl2 (at STP)

    asked on January 31, 2008
  20. Language Arts

    which of the following sentence parts describes the italicized portion of this sentence? the board walk in atlantic city hugs the white, sandy, coastline

    asked on March 7, 2019
  21. Chemistry

    Identify each enthalpy change by name and classify each change as exothermic or endothermic. a)1 mol C3H8 (l) ==> 1 mol C3H8 (g) b)1 mol Hg (l) ==> 1 mol Hg (s) c)1 mol NH3 (g) ==> 1 mol NH3 (l) d)1 mol NaCl(s) + 3.88kJ/mol ==> 1 mol NaCl (aq) e)1 mol NaCL

    asked on May 23, 2010
  22. Algebra

    Given the following vector X, find a non-zero square matrix A such that AX=0: You can resize a matrix (when appropriate) by clicking and dragging the bottom-right corner of the matrix. X= 2 -8 6 A= _ _ _ _ _ _ _ _ _ Please help, I do not understand this..

    asked on October 13, 2018
  23. Mathematics

    Monica stepped outside and began to think how fast she is moving even when she is standing still. Assume that the earth is a sphere with a radius of 3960 miles and Monica is at a latitude of 13∘N. What is Monica's speed due solely to the rotation of the

    asked on October 24, 2016
  24. linear algebra

    If →u and →v are the vectors below, find the vector →w whose tail is at the point halfway from the tip of →v to the tip of →u and whose head is at the point halfway from the tip of →u to the tip of →u−→v. Assume all vectors are in

    asked on September 21, 2018
  25. Calculus

    The area of largest isosceles triangle that can be drawn with one vertex at the origin and with others on a line parallel to and above the x-axis and on the curve y=27-x^2 is.... A) 108 B) 27 C) 12 root 3 D) 54 E) 24 root 3

    asked on March 8, 2011
  26. Physics

    When physicians diagnose arterial blockages, they quote the reduction in flow rate. If the flow rate in an artery has been reduced to 30% of its normal value due to plaque formation, and the average pressure difference has increased by 40%, by what factor

    asked on November 6, 2010
  27. physics

    You swing a 1.40m long string with a metal ball attached to its end in a vertical circle, such that the speed of the ball does not change but the rope is always taut. The tension in the string when the ball is at the bottom of the circle is 64.0N more than

    asked on November 15, 2018
  28. physics

    A curious child finds a rope hanging vertically from the ceiling of a large storage hangar. The child grabs the rope and starts running in a circle. The length of the rope is 13.0m. When the child runs in a circle of radius 7.0m, the child is about to lose

    asked on October 15, 2018
  29. Chemistry

    Identify each enthalpy change by name and classify each change as exothermic or endothermic. a)1 mol C3H8 (l) ==> 1 mol C3H8 (g) b)1 mol Hg (l) ==> 1 mol Hg (s) c)1 mol NH3 (g) ==> 1 mol NH3 (l) d)1 mol NaCl(s) + 3.88kJ/mol ==> 1 mol NaCl (aq) e)1 mol NaCL

    asked on May 23, 2010
  30. astronomy

    what does the phenomenon of interference demonstrate? a)the wave nature of light b)the polarization of light waves c)the quantization of the atomic orbitals d) the particle nature of the photon e) the process of ionization -how about for diffraction?

    asked on September 12, 2010
  31. calculus

    Let f be a continuous function on [−3,3], and suppose 7 is the absolute maximum value of f on [−3,3]. Using properties of integrals, this tells us that ∫3,−3 f(x)dx≤−−−. What number goes in the blank? please help..

    asked on November 30, 2018
  32. linear algebra

    The reduced row-echelon form of the augmented matrix for a system of linear equations with variables x1, ... , x5 is given below. Determine the solutions for the system and enter them below. 1 0 0 -3 -3 = 4 0 1 0 -2 -5 =-1 0 0 0 0 0 = 0 If the system has

    asked on October 7, 2018
  33. chemistry

    How many grams of rust form when 453 kJ of energy are released?

    asked on November 15, 2010
  34. Stats

    Suppose a random sample of size 58 is selected from a population with σ = 9. Find the value of the standard error of the mean in each of the following cases (use the finite population correction factor if appropriate). A) The population size is infinite

    asked on November 21, 2019
  35. calculus

    If F(x)+C is the general antiderivative of f(x), then what is the general antiderivative of f(x)+3 ?

    asked on November 24, 2018
  36. geography

    which event had the greatest impact on the culture of south america

    asked on October 22, 2019
  37. calculus

    You are making a rectangle from two horizontal rods and two vertical rods. Horizontal rods cost $3 per foot and vertical rods cost $5 per foot. If your budget is $180, then what area is the largest possible area of the rectangle? Not sure how to start it

    asked on November 14, 2018
  38. chemistry honors

    a student collects 400 mL of oxygen at 9.80 kPa. if the tempeture remains constant, what volume would this gas occupy at 9.40 kPa

    asked on May 14, 2009
  39. linear algebra

    If A, B, and C are 3×3 matrices; and det(A) = −3, det(B) = −2, and det(C) = −1 then compute: det(2A^−1C^−1A^TC^2B^2) = 0

    asked on October 27, 2018
  40. calculus 1

    the average temperature in Hartford can be expressed as t = f(m) where m is month (January = 1, etc.) and t is the average daily high temperature for the month in degrees F. 1) what is the meaning of f'(m)? rate of change of the average temperature (in

    asked on February 8, 2016
  41. math

    1. Use special right triangles to state the value of the 6 trig functions for 30 degrees, 45 degrees and 60 degrees. 2. Use the calculator to evaluate the value of the following trig functions. sec 54^o 23’ cot 35^o 21’ 45’’

    asked on October 4, 2019
  42. physics

    A 13.0kg block slides 5.00m down a frictionless surface inclined 31.0° above the horizontal, before being stopped by an originally unstretched spring of spring constant k=346N/m secured to the inclined surface. Find the maximum compression of the spring.

    asked on October 27, 2018
  43. math

    A surveyor has a unit pace of 0.9 m/pace. (a) she counts 37 paces while walking From point C to point D. What is the distance between C to D? (b) how many paces should the same surveyor. count to lay out a line roughly 122m long?

    asked on July 4, 2011
  44. physics

    A helicopter is flying horizontally at 7.5 m/s and an altitude of 17 m when a package of emergency medical supplies is ejected horizontally backward with a speed of 13 m/s relative to the helicopter. Ignoring air resistance, what is the horizontal distance

    asked on January 29, 2010
  45. Linear Algebra

    Consider the following system of linear equations: 2x1+2x2+4x3 = −12 x1+6x2−8x3 = −6 x1−2x2+9x3 = −8 Let A be the coefficient matrix and X the solution matrix to the system. Solve the system by first computing A−1 and then using it to find X. I

    asked on October 20, 2018
  46. math

    John has $2.50 in nickels and dimes in his wallet. He has twice as many dimes as nickels. How many of each coin does he have? Let dimes = _____. Let nickels = _______. Equation:________________

    asked on November 11, 2008
  47. math

    the waiting time for a roller coaster is 20 minutes if 150 people are in line how long will you wait if 240 people are in line

    asked on January 14, 2015
  48. English

    Signal Phrase: Read "Too Much Pressure" by Colleen Wenke (564-568). Consider it a model for using signal phrases to introduce quoted material as explained on pages 508-512 of the Bedford Handbook. 1. Copy two good examples from Wenke's essay of signal

    asked on July 3, 2013
  49. chemistry

    what is the chemical word equation for neutralizing acid spills? Please help me!!

    asked on November 3, 2010
  50. physics

    A baseball is thrown with an initial velocity of magnitude v at an angle of 27.2 with respect to the horizontal (x) direction. At the same time, a second ball is thrown with the same initial speed at a different angle with respect to x. If the two balls

    asked on January 30, 2010
  51. geometry

    what is the height of a cone with a volume of 66 cubic centimeters and a base with a radius of 3 centimeters

    asked on October 17, 2011
  52. science

    What does "statistical analysis" mean?? I tried to look at dictinary. com but i didn't get anything that i understood... PLEASE HELP ME!!

    asked on March 25, 2009
  53. calculus

    Take the second derivative of 2sin2(x) and evaluate it at x=π/3. So I got the second derivative, -8sin(2x) How do I solve plug in x=π/3 and solve? Do I use the special triangle?

    asked on October 24, 2018
  54. algebra

    Solve the following system of linear equations: 2x2+4x3+2x4 = −5 5x2+10x3+5x4 = −15 x1+2x2+2x3−3x4 =3 If the system has no solution, demonstrate this by giving a row-echelon form of the augmented matrix for the system.

    asked on October 7, 2018
  55. Math

    if a dog is sitting on a porch and 20 meters away a cat is playing. if the dog travels at 4m per second and the cat travels at 2m per second. how many seconds does the cat have before he should be up a tree

    asked on February 5, 2013
  56. physics

    to prevent dust and soot particles from polluting the atmosphere, industry often employs static electric charge in their smokestacks. explain the physics principle involved in this application

    asked on October 20, 2012
  57. Algrebra

    I would appreciate your help with this. Thank you Solve each equation and check for extraneous solutions. [SQRT(x - 3)] - 7=0 2[SQRT(w + 4)]=5 [SQRT(x)]=-2

    asked on December 31, 2008
  58. probability

    For each 100 8th grade girls in a certain middle school, 85 play soccer, 70 have a cell phone, 75 have a tablet computer, and 80 play a musical instrument. What is the least possible number of these 100 girls who play soccer, have a cell phone, own a

    asked on January 10, 2015
  59. chem PLEASE HELP

    WHO MADE THESE ATOMIC DISCOVERIES? An atom has a nucleus that is very small In a reaction, the mass of the products must equal the mass of the reactants. Electrons are negatively charge pieces of matter. An electron has a mass that is very small compared

    asked on April 14, 2011
  60. calculus

    Consider the following function. f(x) = (x+2)/(x-3) (a) Find f '(x) (b) Find f '(4)

    asked on October 27, 2010
  61. Physics

    If the height of the water slide in the is = 3.9m , and the person's initial speed at point A is 0.60 m/s , what is the horizontal distance between the base of the slide and the splashdown point of the person?

    asked on October 22, 2009
  62. Physical Science

    Almost all the water vapor in the atmosphere is in the exosphere, ionosphere, stratopause, or troposphere?

    asked on June 2, 2009
  63. Science- bio- Please help!!

    Pretend you are a medical professional and it your job to make an I.V. solution for a patient that has a total cellular solute count of 1.19%. What would be the perfect I.V. solution to administer to your patient?

    asked on October 6, 2017
  64. Math

    If apples are 25 cent's, watermelon is 4 dollars, and cantaloupe is 50 cents . what 25 fruits can I buy with 25 dollars ??

    asked on August 20, 2016
  65. Organic Chemistry

    I have a Lab assignment that requires the synthesis of carboxylic acid and our final product is Benzoic Acid. The following equation was provided: C7H8 + KMnO4 ---> MnO2 1) KMnO4, OH-, heat 2) H3O+ We were asked to balance the equation including the

    asked on November 7, 2014

    What is the direction (vertical or horizontal) of the transmission axis of Polaroid sunglasses? Give the physical reason for your answer.

    asked on November 25, 2012
  67. math

    what is the rule for using diameter to find circumference? If the diameter is 2* the length of the radius then d/2 then C=2pie+r. CATCH YOU ON THE FLIP SIDE

    asked on November 26, 2006
  68. calculus

    Find limx→∞ e^−x = 1/e So would the answer be 0?

    asked on October 17, 2018
  69. linear algebra

    If →u and →v are the vectors below, find the vector →w whose tail is at the point halfway from the tip of →v to the tip of →v−→u and whose head is at the point halfway from the tip of →u to the tip of →u+→v. Assume all vectors are in

    asked on September 22, 2018
  70. calculus

    Let t be an angle between π and 3π/2, and suppose sec(t)=−2.6. What is tan(t)? Having a hard time with this one..

    asked on September 19, 2018
  71. science

    What are 5 dinosaurs that lived in Georgia

    asked on September 12, 2018
  72. Chemistry

    How do you create a calibration curve? How do you use a calibration curve to convert absorbance to concentration in mg/mL?

    asked on November 7, 2016
  73. Math

    Please help. Julio uses a scale of 1/ 8 inch  1 foot when he paints landscapes. In one painting, a giant sequoia tree is 34.375 inches tall. How tall is the real tree?

    asked on February 6, 2016
  74. Trigonometry

    Graph the following functions .include two full periods .a)y=3cos(2x) and b)y=-4sin(4x) on same graph

    asked on December 9, 2014
  75. algebra

    solve 1/3(2x-5)=3

    asked on October 11, 2013
  76. Geometry

    The points A,B,C,D have coordinates (3,3) (8,0) (-1,1) (-6,4) respectively. Find the coordinates of the point of intersection of the diagonals AC and BD? Help plZ!!!

    asked on January 30, 2013
  77. biology

    What are two behaviors in either a plant or animal that demonstrates a circadian rhythm?

    asked on August 12, 2011
  78. algebra

    Solve for n: 5to the second power n + 1= 1/25 express answer as a common fraction.

    asked on January 30, 2011
  79. geography

    What are the various problems and difficulties that can occur with a society in the middle of the ocean, or a society under the ocean. (Ex. Waste management, or agriculture) I need about 5. Also, what is the necessary technology needed to make the

    asked on April 5, 2010

    Can someone please solve these for me? Thank you. x^2 + 5x + 6 = 0 [SQRT(x + 3)] = 2[SQRT(x)]

    asked on January 5, 2009
  81. calculus

    Define a function f(x)= {(x^2-9)/(x-3), if x≠3, {c, if x=3 What value of c makes f continuous at x=3? Is the answer 1?

    asked on October 17, 2018
  82. calculus

    Let g(x)=(3x+x^2)(2+e^(x−1)). Find g′(1) So I found the derivative (2x+3)(e^(x−1)+2)+(x^2+3x)e^(x−1) I tried plugging in 1 but I'm getting a different answer..

    asked on October 17, 2018
  83. trig

    if (-12,5) is a pointon the terminal side of an angel 0 find the exact value of six trig funcation of 0

    asked on June 19, 2014
  84. Geometry

    You are given the cordinates of the four points A (6,2), B(2.4), C (-6, -2) and D (-2,-4). Show that the equation of the line DA is 4y-3x = -10 help please!!

    asked on January 30, 2013

    What is the direction (vertical or horizontal) of the transmission axis of Polaroid sunglasses? Give the physical reason for your answer.

    asked on November 25, 2012
  86. Biology: Ecosystems

    What are three groups of organisms that are photosynthetic autotrophs? What are the primary producers of the deep-sea vents?

    asked on August 25, 2011
  87. Science-Physics?

    Hi simple question which of these have the dimension as length? A) a*t^2 B) v^2/2*a C) a*v D) (v^2*m)/F

    asked on October 18, 2009
  88. physics

    can someone else me solve this equation? E=mgh

    asked on September 12, 2016
  89. math

    168p divided by -14

    asked on October 12, 2011
  90. algebra

    Five socks colored blue, brown, black, red, and purple are in a drawer. How many combinations of three socks can be randomly selected from the drawer?

    asked on February 8, 2011
  91. AP math 11 grade

    the charges for a phone call are $.52 for first min. and $.35 for each additional min. A)graph this step function for 6 minutes.Let x represent time, and f(x) the charge B) for the domain 0

    asked on November 21, 2010
  92. linear algebra

    Find the point 4/5 of the way from (7, −10, −4) to (7, 0, 10). Not sure where to go about with this. I'm assuming I find the distance from the two points first..

    asked on September 22, 2018
  93. Math

    Find the solution or solutions of the equation: 3^x=3/2x+6 Thank You ;)

    asked on February 3, 2016
  94. Math

    Please check my answer for this: 17 - 4 x 3 + 8 = The answer I come to is 13

    asked on November 2, 2015
  95. Grammar

    Is "is" an adverb?

    asked on February 8, 2013
  96. temperture

    c= 5over9 (f-32)

    asked on October 17, 2011
  1. Science

    idk help me

    posted on December 3, 2019
  2. Finance

    not sure

    posted on March 21, 2019
  3. Language Arts


    posted on March 7, 2019