Popular questions and responses by ruby
  1. Spanish

    2. ¿Conocen a mi amiga Maria? A. Sí, conocen a tu amiga Maria. B. Sí, conocemos tu a amgia Maria. C. Sí, saben a tu amiga Maria. D. Sí, sabemos a tu amiga Maria. D? 3. ¿_____ tú dónde estáb la biblioteca? A. Conoces B. Sabemos C. Conozco D. Sabes

    asked on August 23, 2018
  2. English

    I have a few questions that I'm stuck on. 1. Identify how the pronoun is used in the sentence. Just today Terry bought a picture for her. direct object indirect object object of a preposition*** (I think this is the answer because of the preposition for

    asked on March 2, 2016
  3. Math

    Hi guys! I am desperately in need of help. I really need to do good on this test but I am uncertain if I am doing this portion correctly. Can someone check my work? 11. Which inequality matches the graph? (The dot on the graph is at 1 and the arrow is

    asked on January 13, 2017
  4. Physical science

    Which type of graph best shows data that are parts of a whole?

    asked on October 29, 2015
  5. Algebra

    On the first part of a trip to Carmel traveling on the​ freeway, Marge averaged 70 mph. On the rest of the​ trip, which was 25 mi longer than the first​ part, she averaged 60mph. Find the total distance to Carmel if the second part of the trip took

    asked on November 27, 2016
  6. Math

    What makes the statement true? 7^-2=? A- 49 B- 1/49*** C- 14 D- 1/14 Am I correct?

    asked on October 14, 2016
  7. Algebra

    True or False 1. – 5, – 5, – 5, – 5, – 5, … is an arithmetic sequence. 2. In an arithmetic sequence, it is possible that the 13th term is equal to its 53rd term. 3. In an arithmetic sequence, the common difference is computed by subtracting the

    asked on September 9, 2014
  8. Math

    For f(x) = 0.01(2)^x, find the average rate of change from x = 2 to x = 10. A.1.275 B.8 C.10.2 D.10.24

    asked on November 4, 2015
  9. math

    1. Which of the following expressions is written in scientific notation? 1. 73.4 x 105 2. 0.09 × 107 3. 80 x 103 4. 4.22 x 10–3 2. Which of the following is 0.0000000708 written in scientific notation? 1. 7.08 x 10–8 2. 7.8 x 10–8 3. 708 x 10–10

    asked on January 31, 2013
  10. English (ELA)

    Hi! I really need to do well on this quiz, can someone check my answers? 1. What can you infer from this sentence near the stat of "The Story-Teller" Most of the Aunts remarks began with "Don't" and nearly all of the children's remarks began with "Why" A.

    asked on October 4, 2016
  11. Physics

    A submarine is at a depth of 15.0 m under the ocean surface. The inside of the submarine is kept at atmospheric pressure. What is the net force being exerted on a circular window of the submarine that has a radius of 25 cm? The density of the ocean water

    asked on January 21, 2014
  12. physics

    a soccer player kicks a stationary ball giving it a speed of 20m/s at an angle of 15degrees to the horizontal. what is the maximum height reached by the ball?

    asked on October 15, 2010
  13. Math

    Mrs Li bought some oranges. She gave 1/2 of them to her sister, 1/4 of the remainder to her neighbour, 3/5 of those left to her children and had 6 left in the end. How many oranges did Mrs Li buy? Explain your workings

    asked on November 5, 2011
  14. calculus

    A ball of radius 10 has a round hole of radius 8 drilled through its center. Find the volume of the resulting solid.

    asked on February 3, 2009
  15. physics

    the question is this: suppose you want to design an air-bag system that can protect the driver in an head-on collision at a speed of 100 km/h. estimate how fast the airbag must inflate to protect the driver-- I GOT THE CORRECT ANSWER TO THIS ONE ALREADY.

    asked on July 16, 2008
  16. physics.

    A steel beam is used in the construction of a skyscraper. By what fraction (change in L)/Lo does the length of the beam increase when the temperature changes from that on a cold winter day (-15 degree F) to that on a summer day (+ 105 degree F)? I got

    asked on February 10, 2008
  17. physics

    1. A piece of rectangular block weighing 5 kg is pressed on a vertical wall by a horizontal force applied to the block. If the coefficient of friction between the block and the wall is 2.0, what force is necessary to keep the block in place? 2. If the

    asked on March 20, 2013
  18. physics

    -A person throws a ball upward into the air with an initial velocity of 15 m per second. - How could you calculate how high the ball goes and how long the ball is in the air before it comes to the thrower's hand?

    asked on July 21, 2008
  19. business letter

    can you check for me? Thanks Assigment: write a business letter according to the background. Background:Assume that you’ve worked for the last five years as an administrative assistant for the Human Resources Department of Broadworth General Hospital.

    asked on February 13, 2010
  20. Biology

    I understand the role of enzymes in chemical reactions but metabolism is the sum of all the reactions in a cell or in the body. So how do enzymes control metabolism? Can they change the number of reactions in a body or can enzymes just control the chemical

    asked on April 6, 2019
  21. mathematics

    Please help me answer this question; 1.A metal gutter open at the tops and ends, is bent up from material 30 cm wide to form a rectangular cross section. a) If the base of the gutter is x cm wide, find the height of the gutter. b)Show that the area of the

    asked on August 29, 2011
  22. physics help?

    A coin with a diameter of 3.30 cm is dropped on edge onto a horizontal surface. The coin starts out with an initial angular speed of 16.1 rad/s and rolls in a straight line without slipping. If the rotation slows with an angular acceleration of magnitude

    asked on November 28, 2010
  23. CIS

    Assume you have a computer that contains 1 GB of memory. It contains 4 memory slots. Each slot can contain on of the following memory modules: 128 MB, 246 MB, 512 MB, 1GB or 2 GB. Two of the slots are currently used, each contain a 512 MB memory module.

    asked on March 3, 2017
  24. Math

    The mass of a 10p coin is 6.5g.What is the mass in kilograms of £20 in 10ps?

    asked on January 30, 2017
  25. Math

    Please help me I don't understand what to do for this, as I haven't learned what to do if I need to find the average of something in Scientific Notation. I tried doing it using division, but I got 0.62 x 10^2, which isn't one of the choices. Could someone

    asked on October 12, 2016
  26. Algebra

    Unit 1: ready, set, succeed- lesson 2 3. C or D ?? 4. A ? Please help

    asked on August 26, 2019
  27. math

    how to solve 7x^2+7y^2-28x+63y-4=0 in general equation of circle?

    asked on June 5, 2019
  28. algebra

    tommy is playing with a kite, and it flies 80 feet high with 100 feet of string released. what is the horizontal distance from tommy to the kite?

    asked on October 26, 2015
  29. physics

    a block of mass 0,5kg is attached to a spring .The spring is compressed to a distance of0,1m.The block is released .The block moves 0,07m past the equilibrium position .What is the force of friction that does work on the block. spring constant is 500

    asked on August 29, 2014
  30. Maths

    Assuming the earth to be a sphere of radius 6370 km.If seventy five percent of the earth's surface is covered by water, then find how many square kilometres is area of the land.

    asked on March 7, 2016
  31. math

    You are skier A, the first skier in a skiing event with three other skiers. Compared to your time, skier B is slower, by a time of +00:28. Skier C has a time of +02:13, and skier D has a time of -01:24. Who is the fastest skier.

    asked on September 2, 2015
  32. physics

    A box is resting on a table frictionless). Determine the weight of the box and the normal force acting on it. (a) If the box was pushed down, with a force of 40N, determine again the normal force acting on the box. (b) If the box was pulled up with a force

    asked on July 22, 2008
  33. Algebra

    Biologists tagged 180 fish in a lake on January 1. On February​ 1, they returned and collected a random sample of 45 ​fish, 15 of which had been previously tagged. On the basis of this​ experiment, approximately how many fish does the lake​ have?

    asked on November 27, 2016
  34. business memo

    can someone double check for me? This is the second part to the business letter I posted a few days ago. Process: Draft an interoffice memorandum to Miriam Hopkins, the Director of Human Resources: a. Assume that you’ve received confirmation from Jeremy

    asked on February 15, 2010
  35. physics

    a block of mass 0,5kg is attached to a spring.The spring is compressed to a distance of 0,1m .The block is released .The block moves 0.07m past the eequilibrium position .What is the force of friction that does work on the block? spring const is 500. F -kx

    asked on August 29, 2014
  36. chemistry

    I have a problem that I need help with. The diameter of the oil molecule has to be calculated and presented in scientific notation. The data in the questions tells me that drop of oil(volume 0.05cm ^3) is released from a dropper onto the surface of the

    asked on February 4, 2007
  37. Math: Algebra

    By what percent will a fraction increase if its numerator is decreased by 10% and its denominator is decreased by 50%?

    asked on March 6, 2016
  38. math

    suppose you use the rule (3x+1,3y-4) to transform the original figure into a new figure. How would the side lengths of the new figure compare to the side lengths of the original? I need help fast. Thank you so much.

    asked on January 16, 2012
  39. math

    A family spends 20% of its monthly income on food, 23% on rent, and 42% on other expenses and saves the balance. If the family saves $360 per month, what is its monthly income?

    asked on March 18, 2008
  40. algebra 1

    1. MULTI-STEP PROBLEM There are 5743 known amphibian species in the world. Of these, 1856 species are judged to be at risk of extinction, and another 113 species may already be extinct. a. Find the probability that an amphibian species chosen at random is

    asked on May 17, 2016
  41. math

    You are skier A, the first skier in a skiing event with three other skiers. Compared to your time, skier B is slower, by a time of +00:28. Skier C has a time of +02:13, and skier D has a time of -01:24. Who is the fastest skier

    asked on September 2, 2015
  42. Chemistry

    h2c4h4o4 + 2naoh --> 2h2o + na2c4h4o4 as for the previous question im sorry i forgot to plug the maleic acid in the formula properly. so this ones it ^ .2213 of c4h4o4 used (maleic acid) and .1 M NaOH 1. show the equation for 1st and 2nd ionization 2. find

    asked on March 12, 2012
  43. chemistry

    help needed in drawing the diagram to show how hydrogen has numerous spectral lines I also need help with this question.... ---------------- ---------------- ---------------- ---------------- ---------------- -------------------- Each line above represents

    asked on February 6, 2007
  44. CHEM

    A 3.5g sample of potassium chloride(KCl)is dissolved in 10mL of water.The resulting solution is the added to 60mL of a 0.5M CaCl2 soltion. Assuming that the volume are additive,calculate the molar concentration and %w/v of each ion present in final

    asked on October 13, 2017
  45. Algebra

    A private plane traveled from Seattle to a rugged​ wilderness, at an average speed of 220 mph. On the return​ trip, the average speed was 264mph. If the total traveling time was 5 hours, how far is Seattle from the​ wilderness?

    asked on November 26, 2016
  46. Algebra

    A private plane traveled from Seattle to a rugged​ wilderness, at an average speed of 220 mph. On the return​ trip, the average speed was 264mph. If the total traveling time was 5 hours, how far is Seattle from the​ wilderness?

    asked on November 27, 2016
  47. physics

    two girls exeret a force of 30 N and 10 N on a bag in same direction. a dog tugs at bag and drag it in oppsite direction with the force of 5 N. calculate the new force exerted on bag and draw a vector diagram. F= 10+30 = 40 N dog applied force in opposite

    asked on December 21, 2014
  48. bobpursley please help

    A coin with a diameter of 3.30 cm is dropped on edge onto a horizontal surface. The coin starts out with an initial angular speed of 16.1 rad/s and rolls in a straight line without slipping. If the rotation slows with an angular acceleration of magnitude

    asked on November 28, 2010
  49. chemistry

    The rate constant of a reaction is 6.2 x 10^-3s-1 at 25 degrees C, and the activation energy is 33.6 KJ/mol.. What is k at 75 degrees C? Enter your answer in scientific notation.

    asked on September 13, 2015
  50. math

    a square carpet covers an area of 64 ft ^2. what is the length of each side of the carpet?

    asked on September 10, 2015
  51. math

    Write in expanded form. 7.37 Is this the correct answer? 7+3/10+7/100

    asked on November 3, 2011
  52. Maths

    please help me answer this question: A pilot sets to fly from B to A and wishes to set a course to offset a 32 km/h easterly wind.The aircraft can fly at the speed of 800km/h in still air. A is 256 from B in a bearing of 330 degrees. a)on what course must

    asked on August 11, 2011
  53. physics

    earlier in this forum, marina asked the same question as i did. unfortunately, someone did answer, very clearly, but for some reason i remained to be a little lost. Here is the question: A car traveling 90 km/h is 100 m behind a truck traveling 75 km/h.

    asked on July 20, 2008
  54. chemistry

    I am in the process of calculating the hydrogen ion concentration in a .25litre solution of sulfuric acid,.21g of sulfuric acid was disolved in water to make the solution. I have calculated the molarity of the acid to be 2.14x10^-3 mol per litre. I also

    asked on March 5, 2007
  55. Science

    How much sodium hydroxide, at what concentration, do I need to add to 500 mL of 0.1 N HCL to obtain pH 6.8. How do you calculate this? pH = -log(H^+) M HCl = N HCl mols = M x L. After you know mols HCl you have, then make a solution of NaOH and calculate

    asked on February 5, 2007
  56. Math- Mixed Numbers

    1. White 17/4 as a mixed number. Hi, could someone please explain how to do this? Correct me if I’m wrong but do I try to multiply 4 x how many times I can before it goes to 17 and the number I get is the whole number and the newmerator is the numbers

    asked on October 7, 2015
  57. physics

    a horizontal force of 3 N is excerted on an object while a vertical force of 4 N is excerted at the same time. calculate the resultant force on the object? 3 square + 4 square = 25 so the resultant force will be 25 N

    asked on December 21, 2014
  58. Math

    Laura is moving up to the attic and wants to paint a wall white. The wall is a triangle with a base of 7.5 feet and a height of 12.25 feet. What is the area of the wall? Please help me!!

    asked on March 30, 2017
  59. Math

    Center at (2,-5), conjugate axis parallel to the y-axis, slopes at asymptotes numerically one-sixteenth times the length of the latus rectum, and distance between foci is 2sqrt145.

    asked on May 14, 2015
  60. Math

    Please check my work. 1) 64 divide -4 = -16 2) -144 divide (-9) = 16 3) Simplify -9 and a small 2 = -81 4) Simplify (-3) and a small 3 = -27 5) Add -4/11 + 5/11 = 1/11 6) subtract 5/11- [-3/11] = 8/11 7) multiply [-7/8] • [-2/4] = 7/16 8) divide -3.5

    asked on November 8, 2011
  61. Pre-Algebra

    I have no clue how to solve these, could someone help me? For questions 6-8, multiple the following polynomials. 7. 4a(a^2+7a+4) A. 4a+28a^2+16a B. 4a^3+28a^2+16a C. 4a^3+44a D. 44a^4 8. (2y-3)(3y-2) A. 6y^2-13y+6 B. 6y^2-13y-6 C. 6y^2+13y-6 D. 6y^2+13y+6

    asked on May 23, 2017
  62. Algebra

    1. Why cant you use the formula of the infinite geometric series on 1/81 + 1/27 + 1/9 + 1/3 + ..... 2. Using concepts of infinite geometric series, show that 0.9999 ..... = 1.

    asked on September 9, 2014
  63. Chemistry

    Suppose u place a beaker containing a solution in the refrigerator. An hour later, white solid found at thr bottom of beaker, wat hapoened? Why?

    asked on February 24, 2013
  64. Dental Terminology and Anatomy

    1.The largest of the salivary glands is the A. Submandibular B. Sublingual C. Minor D. Parotid 2.The portion of the tooth that is used for mastication and is visble in the oral cavity is the A. Cervix B. Crown C. Root D. Gingiva 3.The ____ makes up the

    asked on September 21, 2011
  65. Physics

    Physics Homework _____________________________________________________________ 1.) A particle at t 1 = -2.0 s is at x 1 = 3.4 cm and at t 2 = 4.5 s is at x2 = 8.5 cm. What is its average velocity? Can you calculate its average speed from this data?

    asked on July 20, 2008
  66. college calc

    Approximate the square root of 64.3, y=x^(1/2). Starting point is the square root of 64.

    asked on October 26, 2012
  67. Math

    Amandeep decides to grow a vegetable garden. She wants to make it 10.1m long and 4.2m wide. She is worried about rabbits eating from her garden so she builds a fence around it. The fence will be 11.2m long and 5m wide. What is the area between the fence

    asked on January 12, 2012
  68. physics

    A car moving with a constant acceleration covers the distance between two points 80 m apart in 8.0 s. Its velocity as it passes the second point is 15 m/s. (a) What was the speed at the first point? (b) What is the constant acceleration? (c) How far behind

    asked on October 22, 2011
  69. Chemistry

    Superphosphate, a water soluble fertilizer, is sometimes marked as a "triple phosphate". It is a mixture of Ca(H2PO4)2 + 2CaSO4. Ca3(PO4)2 + 2H2SO4 --> Ca(H2PO4)2 + 2CaSO4 If you treat 400g of calcium phosphate with 267g of sulfuric acid, how many g of

    asked on January 8, 2011
  70. chemistry

    What mass iron(III) oxide could be produced from 8.2 mol of oxygen gas in the synthesis of iron(III)?(Balanced equation)

    asked on March 15, 2010
  71. ETH

    We are writing a paper on "Race in your Community" and I have had a hard time getting going because I live in a small town with really one ethnic group, however as I dug I started finding some minority groups are here, what I am looking for is for some

    asked on April 3, 2008
  72. chemistry

    help required in calculating the pH value of a .84 mols per litre solution of sulfuric acid. I understand that pH = -log 10 (2x 0.84), I am not very experienced with logs and need assistance as to which keys to press on the scientific calculator in

    asked on March 6, 2007
  73. chemistry

    I would like my equation checked, sodium cyanide and water.I have worked the balanced equation as: NaCN+H20=NaOH+HCN. If you want the molecular equation this looks good to me. Actually, it's the CN^- that is hydrolyzed (reacts with water) and the ionic

    asked on February 8, 2007
  74. Science

    The potential energy of a projectile at its maximum height is equal to its kinetic energy there . If the velocity of projection is 20m/s its time of flight is ?

    asked on July 19, 2016

    Sarah took the advertising department from her company on a round trip to meet with a potential client. Including Sarah a total of 66 people took the trip. She was able to purchase coach tickets for ​$150150 and first class tickets for ​$11601160. She

    asked on January 24, 2016
  76. Math

    If Logan's family can drive 23.125 miles on 1 gallon of gas, how far can they drive on 17 gallons?

    asked on April 14, 2014
  77. geometry

    two of the angle of a arallelogram measure 75 what are the measures of the other two angle

    asked on November 29, 2010
  78. physics

    -Suppose that a person is standing on the edge of a cliff 50 m high, so that the ball in his/her hand can fall to the base of the cliff. Questions (a)-How long does it take to reach the base of the cliff? (b)- What is the total distance traveled by the

    asked on July 21, 2008
  79. math[fractions]

    how would u multiply two fractions ex. 2 2/3 times 3 5/6 First, make each one an improper fraction. To do this, multiply the denominator by the whole number in front of it and then add the numerator. Put all of that on top of the denominator: 3*2=6 6+2=8 2

    asked on January 23, 2007
  80. Electronic

    A metal plate infused with excess electrons will attract a proton placed nearby?

    asked on July 16, 2018
  81. algebra

    is this correct?: -4^4= -256 (-5)^2= 25 (-3)^5= -243 ( I don't get the meaning of the parantheses) thank you!

    asked on August 26, 2015
  82. science

    Why do humans use running shoes, winter boots, snowshoes, skis and flippers? Why are these not biological adaptations? Use animals as examples.

    asked on October 28, 2012
  83. Pythagorean theorm

    i have been workin on this problem for hours and desperatly need help. Im suppose to solve the following three problems in the pythagoream theorem form and also find the ratios. Can someone pleasse help me =] Pythagorean Theorem a² + b² = c² 1.) O =

    asked on July 24, 2008
  84. Earth science

    I would like to comfirm that the 4 cycles on Earth are: carbon, water and rock. I think the 4th one is the biosphere but am not sure as the biosphere contains all attributes necessary (including the atmosphere)for life to exist. Am I on the track? I do

    asked on April 25, 2007
  85. Math

    Remove the xy-term by rotation of axes, reduce the resulting equation to standard form and trace the curve on the new axes: 16x^2-24xy+9y^2-60x-80y+100=0

    asked on May 18, 2015
  86. Algebra

    1. Solve for the 101st term of the sequence whose 1st term is x-y and d=2x+y-3. 2. In the sequence 2, 6, 10, … , what term has a value of 106? 3. Solve for the 101st term of the sequence: 6-p, 4+p, 2+3p, 5p, … .

    asked on September 9, 2014
  87. dynamics

    Mass of 2.3 kg and 4.5 kg is connected with the cord as shown. The coefficient of kinetic friction between box and floor is 0.35. Determine: a)The tension in the cord b)The acceleration of the blocks c)If the block start slides with 2.3 m/s, d)How far does

    asked on May 7, 2013
  88. history

    against the Ku Klux Klan. Together, these were known as the _______ Acts. A. Grant B. Force C. Klan D. Reconciliation

    asked on February 2, 2012
  89. physics

    How would you reword the terms of this equation: (1/2)M Vo^2 = M g H Where H is the maximum height above the thrower's hand. H = Vo²/(2 g) = 11.5 m Could you substitute the letters H & M with Y, Yo, V, Vo, G, T, or use any of these four newton's equtions:

    asked on July 22, 2008
  90. MATH

    A customer has a balance of $1,350. Interest is paid at the end of 12 months. Assuming the balance remains at $1,350 for all 12 months, how much interest will be earned after 12 months if the interest rate on the account is 5.5%?

    asked on March 17, 2012
  91. Mathematics

    A man walked for some distance at 8 km/h, and for an equal distance at 5 km/h. The total time he took was 13/4 hours. Find the total distance he walked. Explain your workings

    asked on November 5, 2011
  92. trigonometry

    Simplify:2sec^2A-2/4tan A...Please help,anyone who can answer

    asked on June 5, 2011
  93. trig

    Given Tangent theta = -5 on 4 and cos theta >0, find sine theta and sec theta

    asked on June 4, 2011
  94. physics

    The maximum speed that a car can travel around a flat curved road is 18m/s. What would be the maximum speed for that car around a curve with half the radius?

    asked on November 17, 2009
  95. economics

    what is a country's excess quantity of demand to a nation's? exports or imports

    asked on February 9, 2008
  96. physics

    Assistance required as to why visible light is not emitted when infrared radiation falls on fluorescent materials.

    asked on February 5, 2007
  97. trig

    Simplify the expression cos^2 x (sec^2 x-1)

    asked on March 8, 2012
  98. English

    Hi there, I am doing a presentation on Martin Luther King's March on Washington August 28th, 1963 and was wondering if you direct me to any useful links to information, videos and pictures.

    asked on March 10, 2009
  99. geology

    there are 3 rock types:(a)igneous,(b)sedimentary,(c)metamorphic.If rock (a)were to cut across both other rocks and (c) is the oldest rock, describe the new relationship between the rocks. are you doing 103 by any chance im stuck on this q as well and

    asked on April 20, 2007
  100. biology

    Help needed to draw a mating diagram where L is the dominant gene for the digestion of lactose and shows the crosses between two heterozygotes and wiht the the phenotypic and genotypic ratio of the offspring in the F1 generation. I also need to know the

    asked on March 13, 2007


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