Most popular questions and responses by Shane
  1. Math Word Problem

    Ron is tiling a countertop. He needs to place 54 square tiles in each of 8 rows to cover the counter. He wants to randomly place 8 groups of four blue tiles each and have the rest of the tiles in white. How many white tiles will Ron need?

    asked on November 16, 2012
  2. CHEM

    A 0.4647-g sample of a compound known to contain only carbon, hydrogen, and oxygen was burned in oxygen to yield 0.8635 g of CO2 and 0.1767 g of H2O. What is the empirical formula of the compound? i got C3H3O2 IS IT RIGHT?

    asked on March 14, 2013
  3. chem

    Consider the fermentation reaction of glucose: C6H12O6 ----) 2C2H5OH+2CO2 A 1.00-mol sample of C6H12O6 was placed in a vat with excess yeast. If 35.1 g of C2H5OH was obtained, what was the percent yield of C2H5OH?

    asked on March 14, 2013
  4. Pre-Calculus

    a ferris wheel is elevated 1 meter above ground. When car reaches the highest point of the Ferris wheel, it's altitude from ground level is 31 metres. How far away from the center, horizontally, is the car when it is at an altitude of 25 meters?

    asked on June 8, 2017
  5. Science

    Explain why it is necessary for phloem to be alive to be functional,whereas xylem can function as dead tissue:

    asked on March 6, 2013
  6. math

    In a bag there are 3 green apples,5 yellow apples,7 green pears and 2 yellow pears,Simon randomly is taking fruit out of the bag by one by one. How many fruits must he take out in order to be certain that he has at least one apple and one pear of the same

    asked on February 5, 2017
  7. physics

    A softball of mass 0.220 kg that is moving with a speed of 6.5 m/s (in the positive direction) collides head-on and elastically with another ball initially at rest. Afterward it is found that the incoming ball has bounced backward with a speed of 4.8 m/s.

    asked on December 9, 2009

    Write the expression in terms of sine only. 8(sin 2x − cos 2x)

    asked on May 21, 2013
  9. chemistry

    For the electrolysis of molten potassium bromide: Write the equation for the overall reaction.

    asked on September 7, 2014
  10. chemistry

    For the electrolysis of molten potassium bromide: (a) write the equation for the reaction at cathode. (b) write the equation for the reaction at anode. (c) write the equation for the overall reaction.

    asked on September 10, 2014
  11. 7th math

    I have no more than five books in my bag. I need to write an inequality for this, x

    asked on May 16, 2013
  12. Cruz

    A ferris wheel is elevated 1 meter above ground. When car reaches the highest point of the ferris wheel it's altitude from ground level is 31 meters. How far away from the center,horizontally, is the car it is at an altitude of 25 meters?

    asked on June 8, 2017
  13. statistics

    A music industry researcher wants to estimate, with a 90% confidence level, the proportion of young urban people (ages 21 to 35 years) who go to at least 3 concerts a year. Previous studies show that 21% of those people (21 to 35 year olds) interviewed go

    asked on March 19, 2017
  14. Physics

    A window washer pulls herself upward using the bucket-pulley apparatus shown in Fig. 4-42. The mass of the person plus the bucket is 69 kg.How hard must she pull downward to raise herself slowly at constant speed?If she increases this force by 11 percent,

    asked on October 13, 2009
  15. Math algebra

    The radiator in a car is filled with a solution of 60% antifreeze and 40% water. The manufacturer of the the antifreeze suggests that, for summer diving, optimal cooling of the engine is obtained with only 50% antifreeze. If the capacity of the radiator is

    asked on November 24, 2015
  16. science

    Represent this reaction with balanced chemical equation. Disilane gas (Si2H6) undergoes combustion to form solid silicon dioxide and water.

    asked on November 23, 2012
  17. Chemistry

    I'm stumped 4ko2 + 2co2 ----2k2co3 + 3o2 What mass of k02 in grams is required to react with 8.90 l at 22.0 c and 767 mm hg? Please help thank you

    asked on December 15, 2014
  18. math

    divide $ 680.00 among three children with the ratio 2:4:6 please show me how to work out the answer

    asked on October 22, 2009
  19. chemistry

    in HNO3 titration, you add few drops of phenolphthalein indicator to 50.0 mL of acid in a flask. you quickly add 20.00 mL of 0.0547 M NaOH but overshoot the end point, and the solutions turn deep pink. instead of starting over, you add 30.00 mL of acid,

    asked on September 27, 2014
  20. physics

    A 2.40 kg mess kit sliding on a frictionless surface explodes into two 1.20 kg parts: 3.78 m/s, due north, and 5.28 m/s, 32.8° north of east. What is the original speed of the mess kit?

    asked on March 11, 2015
  21. Chemistry

    One step of the Ostwald process for manufacturing nitric acid involves making nitrogen monoxide by oxidizing ammonia in the presence of a platinum catalyst: 4NH3 (g) + 502 (g)>> 4NO (g) + 6H2O (g). If the percentage yield is 80.3%, how many grams of NO can

    asked on June 10, 2013
  22. Calculus

    Estimate the area under the curve f(x) = x2 + 1 from x = 0 to x = 6 by using three circumscribed (over the curve) rectangles. Answer to the nearest integer.

    asked on March 15, 2016
  23. Maths

    An aeroplane flies due north for 200 km and then turns due east and flies for a further distance of 325km. Find the bearing,to the nearest degree,of the aeroplane from its starting point.

    asked on April 5, 2013
  24. Science

    COMPOUND 1 CH2=CH-CH-OH ________| _______CH3 COMPOUND 2 _____________O ____________// CH3-CH-CH2-C _____|______\ ____CH3______OH *Now, I must: Identify any functional groups in these compounds and name them. The functional group in 1 is the OH which makes

    asked on February 7, 2007
  25. maths

    ABC is the segment of a circle with center O. This segment is enclosed in a rectangle APQC. Given that AC = 32 cm and AP = 8 cm, calculate; (a) The radius of the circle. (b) The angle AOC in both degrees and radians. (c) The area of the shaded region.

    asked on June 20, 2013
  26. chemistry

    The volume occupied by the reaction SiF4(g)+2H2O (g)=SiO2 (s)+4HF (g). is reduced.Predict the direction of shift in the position of equilibrium.Will the shift be in the direction of the more gaseous molecules,or fewer?

    asked on March 6, 2013
  27. math

    Your favorite breakfast cereal contains a toy dinosaur in each box. There are four different dinosaur toys in the complete collection, and each one has an equal chance of being in each box. You want to figure out what the probability is that you will get

    asked on May 16, 2013
  28. Science

    Which of the following represents a decimal system of measurement? 1 quart = 16 fluid ounces 1 mile = 5,280 feet 1 kilometer = 1,000 meters 1 pound = 16 ounces

    asked on October 17, 2012
  29. physics - please help

    A 0.455 kg wood block is firmly attached to a very light horizontal spring (k = 160 N/m). It is noted that the block-spring system, when compressed 5.0 cm and released, stretches out 2.3 cm beyond the equilibrium position before stopping and turning back.

    asked on November 23, 2009
  30. math

    A florist has 78 white roses and 65 red roses. The florist arranges the roses into groups that have the same ratio of white roses to red roses as the whole collection of roses. How many white roses are in a group that has 10 red roses? Complete the ratio

    asked on February 4, 2019
  31. maths

    The coefficient of x^2 is 69 in the expansion of (1-ax)^24, where a>0. Find the coefficient of x^3.

    asked on August 8, 2013
  32. Pyhsics

    A sled slides down a snow-covered hill at CONSTANT SPEED. If the hill makes an ANGLE of 10degrees ABOVE THE HORIZONTAL, WHAT IS THE COEFFICIENT OF KINETIC FRICTION BETWEEN THE SLED AND THE SNOW? ~>HELP!

    asked on October 19, 2009
  33. Math

    An Ostrich can run 174 feet in 3 seconds. it costs $ 6:30 to mail a 6- pound package.

    asked on October 19, 2008
  34. science

    The substances listed on the left side of a chemical equation are the _____. A.coefficients B.products C.reactants im sayin a but not sure

    asked on May 17, 2019
  35. Biology

    Explain why a plant needs to move food around,particularly from the leaves to other regions:

    asked on March 8, 2013
  36. maths

    A parallelogram has two adjacent sides of length 4cm and 6cm reapectively. If the included angle measures 52 degrees, find the area of the parallelogram.

    asked on June 10, 2014
  37. accounting

    As of January 1 of the current year, the Grackle Company had accounts receivables of $50,000. The sales for January, February, and March of 2012 were as follows: $120,000, $140,000 and $150,000. 20% of each month’s sales are for cash. Of the remaining

    asked on May 3, 2015
  38. Chemistry

    Calculate the solubility of the compoud PbI2 in a 0.0333 M solution of Mg(ClO4)2 using (1) activities and (2) molar concentrations

    asked on February 6, 2019
  39. chemistry

    Please I need help. Many,but not all, compounds are made up of positive and negative ions. Three positive ions A^+, B^2+ and C^3+ could form a total of six different compounds with negative ions, Y^2- and Z^3-. Derive the formulae for six compounds and

    asked on August 28, 2014
  40. Trig.

    Help with this problem please. I don't get it at all. A ship is heading due north at 12 mph. The current is flowing southwest at 4mph. Find the actual bearing and speed of the ship.

    asked on March 30, 2010
  41. maths

    Calculate the arc length that subtends an angle of 55 degree at the centre of a circle with radius r = 5cm.

    asked on September 1, 2013
  42. Science

    If changing conditions lead to decreased oxygen levels in the stream, the carrying capacity of the stream for the trout will decrease. Oxygen level in water is therefore a(n) _____________ with respect to the number of trout that a particular stream can

    asked on January 7, 2014
  43. Chemistry

    Calculate the [H], [OH], pH and the pOH of this solution; 0.0025 M NaOH

    asked on June 19, 2013
  44. Macroeconomics

    Durring the late 1970's prices quoted in terms of the Israeli currency, the shekel, rose so fast that the grocery stores listed their prices in terms of the U.S. dollar and provided customers with the dollar-shekel conversion tables that they updated

    asked on October 13, 2010
  45. chemistry

    This balance equation shows the burning of octane in air. 2C8H18 + 25O2 ----> 16CO2 + 18H2O. How many grams of carbondioxide will be produced when 1 mole of octane burns completely?

    asked on August 8, 2013
  46. geo

    a carpenter cut the top section of window frame with a 32 degree angle on each end. The side peices hav an angle of 49 degreese at the top will the side pieces be parallel

    asked on December 1, 2011
  47. physics - PLEASE HELP

    A vertical spring (ignore its mass), whose spring constant is 980 N/m, is attached to a table and is compressed 0.160 m. (a) What speed can it give to a 0.400 kg ball when released? (b) How high above its original position (spring compressed) will the ball

    asked on November 24, 2009
  48. math

    You and your friend collect 180 cans for a food drive. The ratio of cans you collected to cans your friend collected is 4 to 5. Use the tape diagram to find how many cans you collected.

    asked on February 4, 2019
  49. math

    in the auditorium there are 24 rows of seats. the first second rows have 8 chairs and the third and fourth rows have 10 chairs.if this pattern many chairs are in the auditorium?

    asked on November 17, 2012
  50. phi 103

    mrs orlof teaches 2 history classes one in the afternoon and one in the morining yesturday she gave the same test to both classses anyone who failed the test must retake since a greater percentage of students who took the morining test failed the test than

    asked on February 1, 2011
  51. Physics

    A 17 kg child descends a slide 3.5 m high and reaches the bottom with a speed of 1.5 m/s. How much thermal energy due to friction was generated in this process?

    asked on November 16, 2009
  52. Maths

    Ship A is 18.5km from a port P on a beearing of 045 degree and ship B is 26.4km from point P on a bearing of 105 degree. Calculate the bearing of A from B and the distance AB.

    asked on May 6, 2013
  53. maths

    A lighthouse is 9.6 nautical miles from a ship which bears 156 degrees from the lighthouse.How far is the ship east of the lighthouse?Give answer correct to one-tenth of a nautical mile.

    asked on March 3, 2013
  54. Probabilities (Math)

    An experiment consists of tossing a coin 14 times. (a) How many different outcomes are possible? (b) How many different outcomes have exactly 9 heads? (c) How many different outcomes have at least 2 heads? (d) How many different outcomes have at most 10

    asked on March 22, 2010
  55. physics

    An object in equilibrium has three forces exerted on it. A 25 N force acts at 90 from the x-axis and a 48 N force acts at 60. What are the magnitude and direction of the third force

    asked on November 29, 2015
  56. chemistry

    Write the anodic reaction for the electrolysis of concentrated zinc chloride solution. (a) Using plantium electrodes. (b) Using zinc electrodes

    asked on September 6, 2014
  57. algebra

    Six people are going to be seated in a row of 8 chairs. How many different ways may they be seated?

    asked on December 14, 2010
  58. maths

    Write 1/2^1-n in non- fractional form.

    asked on May 19, 2014
  59. Maths

    A surveyor measures the angle of elevation of the top of the mountain from a point (P) at sea level as 30 detre along a track which slopes uniformly uphill towards the mountain. From this point, which is 50 metre above sea level, he measures the angle of

    asked on June 20, 2013
  60. physics

    What is the apparent weight of a lead brick 2.0 in x 2.0 in x 8.0 in if placed in oil with density p=0.93 g/cm^3 (Ppb=11.4 g/cm^3)(1 in. = 2.54 cm)

    asked on January 21, 2013
  61. government

    We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness. — That to secure these rights, Governments

    asked on August 18, 2016
  62. science

    Describe one benefit of the transpiration stream of a plant:

    asked on March 7, 2013
  63. Science

    Does all the water which rises up a plant escape through the leaves?

    asked on March 5, 2013
  64. Science

    A solution of silver nitrate is mixed with a solution of potassium sulphide.Write the molecular,total ionic,and net ionic equations illustrating the reaction.

    asked on November 23, 2012
  65. algebra

    Last year, Hans deposited $3000 into an account that paid 5% interest per year and $7000 into an account that paid 4% interest per year. No withdrawals were made from the accounts

    asked on February 24, 2018
  66. Algebra

    The difference between twice a number and a number that is 5 more than 3. Write an equation that could be used to find the value of the number n, and explain how you arrived your choice

    asked on October 16, 2016
  67. maths

    Obtain the binomial expansion of (2-x) (1+1/2x)^8 in ascending powers of x as far as the term in x^3. Use your result to estimate the value of 1.9 times (1.05)^8.

    asked on August 6, 2013
  68. Maths

    ABC is the segment of a circle with center O. This segment is enclosed in a rectangle APQC. Given that AC=32cm and AP = 8 cm, calculate; (a) The radius of the circle. (b) The angle of AOC in both degrees and radians (c) The area of the shaded region.

    asked on June 18, 2013
  69. Algebra

    A rectangle has dimensions in feet as shown in the figure it is 2x +5 And one side is 8. I need to write an expression for the area of the rectangle. B. Find the area of the rectangle, in sq.ft. if x=3 C. Find the value of x if the area of the rectangle is

    asked on October 3, 2016
  70. Biology

    Mature phloem is a live tissue,whereas xylem is dead when mature.Explain why it is necessary for phloem to be alive to be functional,whereas xylem can function as dead tissue:

    asked on March 8, 2013
  71. calculus

    A)A lighthouse emits a beam of light that rotates (counterclockwise from a birds-eye perspective) at a constant rate with one full rotation every 10 seconds. 100 feet east of the lighthouse is a long wall running north-south. How fast is the light’s

    asked on October 17, 2019
  72. Math

    Two cars leave the same town and travel in opposite directions. At the end of 8 hours, the cars are 896 miles apart. Find the rate of each car if the rate of one car is 4 mi/hr more than the rate of the other.

    asked on November 24, 2015
  73. maths

    Expand (1-x)^4. Hence find S if S = (1-x^3)^4 - 4(1-x^3)^3 + 6 (1-x^3)^2 - 4(1-x^3) + 1.

    asked on August 6, 2013
  74. maths

    A chord subtends an angle of 68 degree at the centre of a circle of radius 200 mm.Find the length of the chord.

    asked on March 3, 2013
  75. Maths

    The diagonals of a rhombus are 320mm and 240mm in length.Find the angles of the rhombus.

    asked on March 3, 2013
  76. math

    Which figure in the pattern below will have 99 squares? Figure 1 (picture of 1 square) Figure 2 (picture of 3 squares) Figure 3 (picture of 5 squares)

    asked on October 11, 2010
  77. Physics

    The mass of a certain planet is six times the mass of the earth and the diameter of the planet is twice the diameter of the earth. Find the acceleration od gravity on the surface of this planet. HELP ME SOLVE! THANKS!

    asked on October 15, 2009
  78. math

    2005 2006 2007 2008 Plant 1 20 4 25 10 Plant 2 25 5 5 48 Plant 3 20 8 20 32 Plant 4 43 10 10 47 Plant 5 40 11 15 48 A gardener recorded how many tomatoes 5 plants produced each year. Which year had the LARGEST interquartile range of tomatoes produced? A)

    asked on May 16, 2013
  79. HELP Physics

    The average rate at which energy is conducted outward through the ground surface in a certain region is 30.9 mW/m2, and the average thermal conductivity of the near-surface rocks is 3.11 W/m·K. Assuming a surface temperature of 9.48°C, find the

    asked on April 12, 2013
  80. maths

    Using the complementary angle ratio results,find the value of x for the following. (a) cos(x+35)degree=sin x degree (b) sec x degree=cosec(x+20)degree

    asked on April 5, 2013
  81. maths

    Two walkers set off at the same time from a crossroad and walk along flat straight roads inclined to each other at 68 degrees.If they both walk at a speed of 6km/h,find their distance apart 10 minutes later.

    asked on March 10, 2013
  82. maths

    A ship sailing on a course bearing 036 degrees is 5500 metres due south of a lighthouse.If the ship continues on this course,what is the closest distance the ship will come to the lighthouse?

    asked on March 8, 2013
  83. science

    Explain what is meant by source to sink flow in phloem transport.

    asked on March 6, 2013
  84. chemistry

    What is the molarity of a sulfuric acid solution if 30.00mL of H2SO4 is required to neutralize 0.840g of sodium hydrogen carbonate? H2SO4(aq) + NaHCO3(aq) → Na2SO4(aq) + H2O(l)+ CO 2(aq)

    asked on December 4, 2012
  85. Chemistry

    Complete and balance the following equations.Identify each type of the reactions. (a) Cr + O2 >Cr2O3: (b)Na2CO3 + Mg3(PO4)2: (c)H3BCO+ H2O> B(OH)3 + CO + H2:

    asked on November 25, 2012
  86. chemistry

    Represent this reaction with a balance chemical equation. Solid aluminium hydride is formed by a combination reaction of its two elements.

    asked on November 25, 2012
  87. AP Physics C

    A stone is catapulted at time t = 0, with an initial velocity of magnitude 21.5 m/s and at an angle of 35.3° above the horizontal. What are the magnitudes of the (a) horizontal and (b) vertical components of its displacement from the catapult site at t =

    asked on September 17, 2012
  88. Algebra

    how many cubic feet are in the volume of a round swimming pool which is 16 feet in diameter and 4 feet deep throughout?Express your answer in terms of pi.

    asked on December 14, 2010
  89. algebra

    Two runners jog around an oval path at constant rates, but in opposite directions. One runner completes a lap every 10 minutes, and the other does a lap every 12 minutes. How many minutes lapse between consecutive meetings of the runners? Express your

    asked on December 14, 2010
  90. Math

    I have a series of questions that I did. They lead up to the last question I can't solve. Could you check my math and help me with the last question? Thanks! a) Let a be the point (2,3). Compute the distance from Origin 0 to A answer: a^2 + b^2 = c^2 3^2 +

    asked on October 14, 2010
  91. algebra

    I have a few problems I need you to take a look at and tell me if I arrived at the right answer. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1), (-6,

    asked on January 7, 2010
  92. History

    What is one certain long-term cost of adding to national debt? a.) Americans in the future must have fewer public services b.) Americans in the future will not vote in elections c.) Americans in the future will not enjoy the benefits of the program d.)

    asked on April 30, 2015
  93. chemistry

    How many grams are there in 2.5 moles of CuSO4.5H2O?

    asked on August 11, 2014
  94. math

    a recipe calls for 2 and 3/4 cups of milk. how many cups of milk written as a fraction greater than one are used in the recipe?

    asked on March 6, 2014
  95. Maths

    Using the exact trigonometric ratios of 45 degree,30 degree and 60 degree,evaluate the following,leaving where necessary your answer in surd form. (a) 3 sin 30 degree-2 cos 60 degree (b)(tan 45 degree)(4 cos 60 degree-2 cos 60 degree)

    asked on April 5, 2013
  96. maths

    Two walkers set off at the same time from a crossroad and walk along flat straight roads inclined to each other at 68 degrees.If they both walk at a speed of 6km/h,find their distance apart 10 minutes later.

    asked on March 10, 2013
  97. chemistry

    If the temperature of the system PCl5 (g) =PCl3 (s) + Cl2 (g) + 92.5 kj. is increased, predict the direction of th Le Chatelier's shift.

    asked on March 6, 2013
  98. 6th Grade Math

    I just need some direction to get started please.... Some family friends have asked you to plan a rafting expedition. A rafting has given you specific details on how much weight a raft can hold. A raft can safely carry the weight of 24 babies. The weight

    asked on February 3, 2009
  99. Algebra

    The sum of 3 consecutive odd numbers is 63. What is the smallest of these numbers

    asked on October 19, 2016
  100. Math

    Prove the identity: sec^4x - tan^4x = 1+2tan^2x

    asked on November 10, 2014


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