Popular questions and responses by Lucy
  1. Math

    If 3,p,q,24 are consecutive terms of an exponential sequence. Find the value of p and q.

    asked on October 1, 2019
  2. Chemistry

    The heat of combustion of bituminous coal is 2.5 x 10^4 J/g. What quantity of coal is required to produce the energy required to convert 100. Pounds of ice at 0.0 degrees Celsius to steam at 100.0 degrees Celsius? Is the answer 5.36 about right. I'm not

    asked on January 6, 2015
  3. mathematics

    A frustrum that is cut of has the bottom radius being 63 and the top radius is 21.the height is 12.Find the volume of the frustrum.I 1st used the formula of R/r=H/h and i got the bigger height being 18 while the smaller height being

    asked on July 17, 2020
  4. Algebra

    Among all pairs of numbers with a sum of 34, find the pair whose product is maximum. Write your answers as fractions reduced to lowest terms.

    asked on October 9, 2015
  5. chem

    60cm^3 of oygen diffuses through a porous pot in 50seconds.How long would it take 60cm^3 of oxgen gas diffuses through a porous pot in 50sec.How long would it take 60cm^3 of sulphur(iv)oxide to diffuse through the same pot under the same conditions?

    asked on July 9, 2020
  6. College Algebra

    The area of a rectangular wall of a barn is 24 square feet. Its length is 8 feet longer than twice its width. Find the length and width of the wall of the barn

    asked on August 15, 2012
  7. Algebra

    A = P(1 + rt) is used to find the principal amount P deposited, earning r% interest, for t years. Use this to find what principal amount P David invested at a 5% rate for 12 yr if A = 7,000.

    asked on February 7, 2019
  8. physics

    A 6.0 Ù resistor and a 3.0 Ù resistor are connected in parallel to a 1.5 V battery of negligible internal resistance. What is the current in the 3.0 Ù resistor?

    asked on March 6, 2014
  9. Pre-Calculus-check answers

    Use a sum or difference identity to find the exact value of sin 255 degrees Answer: sqrt6-sqrt2/4 Thanks

    asked on August 30, 2008
  10. maths

    A plane climbed 10.000m in 19.4 minutes. What was the average rate of climb per minute

    asked on January 27, 2019
  11. interior decorateor

    Which of the following statements is correct regarding the design concept of emphasis? A. Focal points in a room's architecture must be emphasized with contrasting colors. B. A focal point can't be established in a setting where formal balance is used. C.

    asked on August 24, 2016
  12. Pre-Calculus-check answers

    If cos theta = 0.8 and 270

    asked on August 31, 2008
  13. Math

    if i were to get:Mathematics 80,English 85,Kiswahili 70,History 90,French 80,Chemistry 90,Biology 85,C.R.E 100.What would be my final grade.Please help!!!!

    asked on July 24, 2020
  14. Algebra

    A rectangular auditorium seats 1960 people. The number of seats in each row exceeds the number of rows by 9. Find the number of seats in each row. Thanks!

    asked on October 6, 2015
  15. microeconimics

    one type of systematic error arises because people tend to think of benefits in percentage term rather than in absolute dollar amounts. as an example, samir is wiling to drive 20 minutes out of his way to save $4 on grocery item that cost $10 at local

    asked on July 10, 2015
  16. Calculus

    Evaluate each telescoping sum: 1) Sum from i = 1 to 100 of (5^i - 5^(i-1)). I know that I could apply the (n(n+1))/2 summation rule to the 5^i part of the question and then plug in 100, but I am unsure what to do for the second half --> -5^(i-1)! Thank you

    asked on January 9, 2015
  17. math

    what is 2.47 rounded to the nearest tenth?

    asked on November 17, 2010
  18. 6th grade

    in this sentence - Grandma has just made chocolate chip cookies, what part of speech is the word "just"??

    asked on March 10, 2010
  19. chemistry

    Based on a Ksp experiment, describe a way to soften water by removing calcium ions. What would be the advantages and disadvantages of your method?

    asked on April 12, 2009
  20. Math

    A tree is losing its trees. Two thirds fall off in the first week, two thirds of those remaining fall off in the second week, and two thirds off those remaining fall off in the third week. Now there are 37 leaves. How many leaves did the tree have

    asked on October 25, 2014
  21. Algebra II

    Use log5(2)=0.4307 and log5(3)=0.6826 to approximate the value of log5=54. According to the example in my book I would divide 0.6826 by 0.4307 and the answer is 1.5848 but this is not one of the answers given. My choices are: a) 0.1370 b) 2.4785 c) 0.8820

    asked on March 29, 2008
  22. Chemistry

    Calculate the enthalpy change for the reaction 2C (s) + H2 (g) yield C2H2 (g) given the following reactions and their respective enthalpy changes: C2H2(g) + 5/2 O2(g) yield 2CO2(g) + H2O (l) = -1299.6kJ C(s) + O2(g) yield CO2 (g) -393.5 H2(g) + 1/2 O2(g)

    asked on December 29, 2007
  23. maths

    The ratio of the 6th to the 2nd term of geometric sequence is 256.If the 3rd term of this sequence is 32.Determine the first and the third term.

    asked on July 3, 2020
  24. science

    if 8.100 grams of C6H6 is burned and heat is produced from the burning is added to 5691 grams of water at 21 degrees celsius what is the final temp of the water? 2C6H6+15O2=12CO2+6H2O+6524kj

    asked on October 17, 2013
  25. Chemistry

    For the chemical reaction CH3Br + OH- CH3OH + Br-, which of the following would speed up the reaction? increasing the CH3Br concentration reducing the OH concentration cooling the reactant mixture Please help with this question. I appreciate it. Thank you.

    asked on April 16, 2012
  26. World History

    How has the world changed since the end of the Cold War, especially in the Middle East, Africa, and Asia?

    asked on May 26, 2020
  27. Math

    Mrs. Daniel pays $324 for a handbag and 3 pairs of shoes. The handbag costs half as much as the 3 pairs of shoes combined. Find the cost of the handbag.

    asked on September 15, 2011
  28. chemistry

    A compound weighing 42 grams was found to contain 12 grams of magnesium,6 grams of carbon the rest oxgen.Determine the empirical formular.i got i right or wrong

    asked on April 18, 2020
  29. math

    In a Grand Prix automobile race, Speedy Ryder averaged 110 miles per hour for the first half of the course and 130 miles per hour for the second half of the course. Cannonball Carter maintained a constant speed of 120 miles per hour throughout the race.

    asked on July 24, 2018
  30. Chemistry

    A model rocket is launched straight upward with an initial speed of 45.0 m/s. It accelerates with a constant upward acceleration of 1.50 m/s2 until its engines stop at an altitude of 160 m. A. what is the max height reached by the rocket? B. How long after

    asked on September 10, 2017
  31. Algebra

    Please check my answer The domain of the following relation: R: {(−4, 8), (8, 10), (5, 4), (1, 6), (5, −9)} is a. {8,10,4,6,-9} b.{-4,1,5,8) c. {-4, 8, 5,1,5} d. no domain exists I think that it is A, Am I right? Thanks

    asked on October 30, 2015
  32. statistics

    A box contains 19 red marbles and 19 green marbles. Sampling at random from the box five times with replacement, you have drawn a red marble all five times. What is the probability of drawing a red marble the sixth time?

    asked on October 12, 2014
  33. Algebra II

    1) Find the exact value of cos 105 degrees by using a half-angle formula. 2)Find the solution of sin 2theta = cos theta if 0 degrees

    asked on April 19, 2008
  34. maths

    The 10th term of an arithmetic sequence is 42 more than the 7th term.If the 1st term is -14,find the second term of the sequence

    asked on July 2, 2020
  35. chemistry

    Calculate the number of moles of Na2CO3 present in 100cm^3 of 2 M Na2CO3 solution.i got 5 i right

    asked on June 30, 2020
  36. chemistry

    Determine the number of sodium ions contained in 25cm^3 of 0.5M sodium carbonate solution.

    asked on June 30, 2020
  37. math

    A distance of 12km is represented by a length of 4cm on a map.Given that the scale of the map is 1:n,find the a)value of n b)actual area in hectares of a field on the map with an area of 32cm^2

    asked on April 11, 2020
  38. Math check my answer

    The weight of a person on Venus varies directly with his or her weight on Earth. A person weighing 120 pounds on Earth weighs 106 pounds on Venus. How much would a person weighing 180 pounds on Earth weigh on Venus? A. 120 pounds

    asked on October 11, 2019
  39. Social Studies

    1.Which is a source of political conflict between China, Japan, and South Korea today? A. trade barriers B. nuclear weapons development C. land claims in the South China Sea D. economic sanctions

    asked on October 3, 2019
  40. ochm

    sodium lauryl sulfate can be prepared by replacing chlorosulfonic acid with another reagent. what could be used? show equations

    asked on September 8, 2015
  41. physics

    A 0.50 kilogram ball is thrown vertically upward with an initial kinetic energy of 25 joules. Approximately how high will the ball rise ?

    asked on April 30, 2011
  42. CHEMISTRY- molality

    a sucrose solution was prepared by dissolving 13.5g sucrose in enough water to make 100ml of solution. the density is 1.050gml. calculate molality

    asked on October 9, 2010
  43. Pre-calculus

    solve 4 sin^2x + 4 sqrt 2 cos x-6=0 for all real values of x. Going by the example in the book I got to: 4 cos^2x + 4sqrt2 cosx -10 = 0 but do not know how to proceed. Any help would be great. Thanks

    asked on October 13, 2008
  44. math

    A cylindrical metal bar of diameter 14 cm and length 2m is melted and moulded into spherical balls.In the process,5% by volume is lost and what remains makes ball of radius 3.5cm.a)calculate the volume of metal used to make the balls.b)find to the nearest

    asked on April 15, 2020
  45. maths

    A rectangle measures 20 cm by 15.If each dimension is increased by 2.5cm,by what percentage is:a)the perimeter of the rectangle increased b)the area of the rectangle is increased.Explain in detail

    asked on April 11, 2020
  46. math

    Given that 2x^2-kx+18 is a perfect square,find k and hence solve the equation 2x^2-kx+18=0 by factorisation.Plz explain in detail.

    asked on April 8, 2020
  47. HELP!

    Which set of numbers is correctly ordered from smallest to greatest? A) 0.009, 0.0099, 0.0909, 0.099 B) 0.0099, 0.009, 0.0909, 0.099 C) 0.0909, 0.099, 0.009, 0.0099 D) 0.099, 0.0099, 0.009, 0.0909 Help ME!

    asked on December 8, 2016
  48. Chemistry

    How much time is required for a sound to travel 1 mile if the air temperature is: 0.0 Degrees Celsius 20.0 Degrees Celsius 40.0 Degrees Celsius 80.0 Degrees Celsius

    asked on March 12, 2015
  49. physics

    The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. A swimming polar bear climbs onto a piece of floating ice that has a volume of 3.25 m3. What is the weight of the heaviest bear that the ice can support without sinking completely

    asked on November 1, 2012
  50. Health Sciences

    i need interesting topics for a presentation for (English for Medical Sciences) !! topics like diseases or anything .. please reply ASAP

    asked on November 5, 2011
  51. Chemistry-College

    Given that: 2Al(s)+(3/2)O2(g)--->Al2O3(s) change in H(rxn)= -1601 kJ/mol 2Fe(s)+(3/2)O2(g)--->Fe2O3(s) change in H(rxn)= -821 kJ/mol Calculate the standard enthalpy change for the following reaction: 2Al(s)+Fe2O3(s)--->2Fe(s)+Al2O3(s) _______kJ

    asked on October 31, 2010
  52. Physics

    What is the potential difference required to accelerate a deuteron of mass 3.3x10^27kg and charges 1.6x10^-19C from rest to a speed of 5.0x10^6m/s?

    asked on April 21, 2009
  53. ipc

    How would I balance this equation Ca(C2H3O2)2+K3PO4-->Ca3(PO4)2+KC2H3O2

    asked on February 10, 2009
  54. Pre-Calculus-check answers

    Write an equation of the tangent function with period 3pi/8, phase shift -pi/5, and vertical shift -2. Answer: y=tan(8x/3 - 8pi/15)-2 Thanks

    asked on August 30, 2008
  55. Algebra II

    Find the exact value of cos 375 degrees. Answer: (sqrt6 + sqrt2)/4 Is this correct?

    asked on April 19, 2008
  56. math

    A man left his estate in kerugoya to his two sons.The remainder was to be shared equally among his six brothers.If the estate was worth sh 3,456,000,how much did each of those people get?Explain in detail

    asked on April 11, 2020
  57. maths

    The angle of elevation of the top of a tree from a point P on a horizontal ground is 30°.From another point Q 8 metres from the base of the tree,the angle of elevation of the angle of elevation of the top of the tree is 48°. a)Calculate to one decimal

    asked on April 7, 2020
  58. maths

    A piece of metal has a volume of 20 cm^3 and a mass of 300g.Calculate the density of the metal in kg/m^3.i got 15.plz confirm my answer.And how does one go about this.2.5 litres of water density 1g/cm^3 is added to 8 litres of alcohol density 0.8

    asked on March 31, 2020
  59. math

    The distance (d) in meters that an ant can travel varies directly with the amount of time (t) in hours it spends walking. Assume that an ant’s constant of proportionality is 18. If an ant walks for 10 minutes, how far will it travel in meters? If an ant

    asked on September 15, 2019
  60. math

    Statuary Hall is an elliptical room in the United States Capitol Building in Washington, D.C. The room is also referred to as the Whispering Gallery because a person standing at one focus of the room can hear even a whisper spoken by a person standing at

    asked on June 10, 2018
  61. Math

    A 73​-ton monolith is transported on a causeway that is 2500 feet long and has a slope of about 2.2°. How much force parallel to the incline would be required to hold the monolith on this​ causeway?

    asked on November 3, 2016
  62. Chemistry

    How many grams of ethanol must be added to 500.0 g of water to make a solution that freezes at 0.00 degrees fahrenheit? The molal freezing point depression constant for water is 1.86 degree celsius over moles.

    asked on October 24, 2016
  63. Math 143

    What is the probability of not rolling a number larger than 4 with a fair die?

    asked on April 10, 2016
  64. psychology

    The biosocial approach suggests that gender differences are based on: a. the hormone and neurological differences between men and women. b. how men and women think about their environment. c. the physical ability of men to protect the home and of women to

    asked on June 18, 2015
  65. physics

    The small piston of a hydraulic lift has a diameter of 8 cm and its large piston has a diameter of 40cm. The lift raises a load of 15,000 Newtons. A. Determine the force that must be applied to the small piston. B. Determine the pressure applied to the

    asked on January 6, 2015
  66. chemsitry

    How many moles of silver chromate will be produced from 146 g of silver nitrate?

    asked on November 3, 2014
  67. algebra 1

    at a certain high school,350 students are taking algebra. the ratio of boys to girls taking algebra is 33:37. How many more girls are taking algebra than boys? - How can you write a system of equations to model the situation? - Which equation will you

    asked on January 27, 2013
  68. College (Enthalpy) - College

    S(rhombic)+O2(g)--->SO2(g) change in H(rxn)= -296.06 kJ/mol S(monoclinic)+O2(g)--->SO2(g) change in H(rxn)= -296.36 kJ/mol 1. Calculate the enthalpy change for the transformation. S(rhombic)-->S(monoclinic) Our goal is to calculate the enthalpy change for

    asked on October 31, 2010
  69. Chemistry

    How do you tell if a molecular shape (VSEPR) is symmetrical or asymmetrical? I know that if it has lone pairs, it must be asymmetrical, but are there any other factors that could make it asymmetrical?

    asked on October 26, 2008
  70. Pre-calculus

    A set of data is normally distributed with a mean of 500 and a standard deviation of 40. What percent of the data is between 460 and 540? Answer: 68.3%

    asked on October 8, 2008
  71. Pre-Calculus

    Two cards are drawn from a standard deck of 52 cards. What is the probability of drawing 2 queens or 2 red cards? (4/52)(3/51)=1/221 ---drawing a queen (26/52)(25/51)=25/102--drawing a red card (1/221)(25/102)= 25/22542 drawing a queen or red card Is this

    asked on September 17, 2008
  72. Pre-Calculus

    Consider a class with 10 sophomores, 8 juniors, and 6 seniors. Two students are selected at random. 1) What is the probability of selecting 1 junior and 1 senior. 2) Find the odds of selecting two students who are not seniors. How do I set these up to

    asked on September 14, 2008
  73. Algebra II

    Find the exact value of sin(theta/2) if cos theta = 2/3 and 270 degrees

    asked on April 19, 2008
  74. Biology

    Why do lungs feel spongy? Is it because they contain alveoli...?

    asked on January 15, 2008
  75. Chemistry

    Write the net ionic equation for the reaction between sulfuric acid and potassium hydroxide. I got 2H^+ + 2OH^-1 ==> 2H2O. Is this correct?? Thanks.

    asked on December 2, 2007
  76. Chemistry

    What mass of sucrose, C12H22O11, is needed to make 500mL of a 0.20M solution? Help please... Thanks.

    asked on November 18, 2007
  77. Maths

    Write the 1st 3 terms of the sequence whose n^th term is given by 2^n+1.

    asked on July 2, 2020
  78. math

    In a circle radius 10cm,an arc PQ subtends an angle of radians at the centre of the circle.Calculate the radius of another circle whose circumference is equal to the length of arc PQ

    asked on April 22, 2020
  79. Math

    Find the probability of spinning a 5 and rolling a 1, 2, or 3. A) 1/16 B) 1/2 C) 1/6 D) 1/8

    asked on April 19, 2020
  80. maths

    A village water tank is in the form of a frustrum of a cone of height 3.2 cm.The top and bottom radii are 18cm and 24cm respectively.Calculate:The surface area of the tank

    asked on April 2, 2020
  81. Math

    Suppose you toss a fair, two-sided coin. List the sample space. List one possible event. Calculate the probability of that event.

    asked on February 19, 2020
  82. math

    A solid metal cylinder has diameter 60cm and height 28cm.It is melted and recast to 50 equal cubes.Find the edge of each cube to 3 significant figures

    asked on December 13, 2019
  83. steve plz help me on my math

    Find the perimeter of a rectangular area with a length of 13 inches and a width of 7 inches using distributive property and not using it.

    asked on December 1, 2016
  84. Music

    Can anyone help me find guitar chords for Regina spektor' song a cannon?

    asked on August 17, 2016
  85. History

    What does this mean? "It is apparent to my mind that the President thoroughly believed the tenure of office act to be unconstitutional and void . He was advised by every member of his cabinet...... "This was a punitive statue. it was directed against the

    asked on February 11, 2016
  86. Spanish

    Which sentence correctly substitutes the bolded phrase? Carla compro /los anteojos de sol./ Carla las compro Carla lo compro Carla los compro Carla la compro I'm confused because it's los anteojos but I thought los was part of it, and that it doesn't make

    asked on November 1, 2015
  87. math

    the sum of the ages of two siblings is 23 and the difference between their ages is 7. if frank is the older brother of beth, determine their ages by creating a pair of simultaneous equations and solving them. this is killing me i have been working on it

    asked on September 10, 2015
  88. Physics

    A ball of mass 0.6 kg, initially at rest, is kicked directly toward a fence from a point 20 m away, as shown below. The velocity of the ball as it leaves the kicker’s foot is 18 m/s at angle of 58◦ above the horizontal. The top of the fence is 10m

    asked on September 9, 2015
  89. genetics

    What is a replication bubble? A.A complex of replication enzymes on the DNA template strand B.A DNA sequence that initiates replication C.A tangle of denatured DNA strands near the replication fork D.A locally denatured segment of DNA where replication

    asked on March 22, 2015
  90. genetics

    In tomatoes, the allele T for tall plant height is dominant to dwarf allele t, the P allele for smooth is dominant to the p allele for peach fuzz skin, and the allele R for round fruit dominant to the recessive r allele for oblong fruit. The genes

    asked on March 22, 2015
  91. physics

    Imagine having an 80-turn coil with radius of 5.0 cm and resistance of 30 Ù. At what rate must a perpendicular magnetic field change to produce a current of 4.0 A?

    asked on March 30, 2014
  92. physics

    A uniform magnetic field makes an angle of 30 degrees with the axis of a circular loop of 300 turns and radius of 4 cm. The magnetic field changes at a rate of 85 T/s. Determine the magnitude of the induced emf in the loop.

    asked on March 30, 2014
  93. Chemistry

    Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas are formed when 48.7 g of sodium are added to water?

    asked on January 24, 2013
  94. Math

    You walk at 4 miles per hour for 1/2 hour, and then jog at 6 miles per hour for h hours. The total distance that you cover both walking and jogging is 6 miles. Write an equation that represents this situation.

    asked on January 23, 2013
  95. Chemistry

    What is the Ph for the solution made from 11.10mL of 0.278M HCL solution mixed with 70.90mL of 0.1300M ammonia solution? The pKa for NH4 is 9.241.

    asked on May 29, 2011
  96. poetry

    a face by marianne moore

    asked on May 24, 2011
  97. stats

    Particles are a major component of air pollution in many areas. It is of interest to study the sizes of contaminating particles. Let X represent the diameter, in micrometers, of a randomly chosen particle. Assume that in a certain area, the probability

    asked on February 3, 2011
  98. College Physics - fixed

    A positive and a negative charge are positioned as shown: + | - _______| The distance from - to corner is 4.00m and the distance from corner to + is 3.00m. Q1 = 4.00 microCoulomb Q2 = -4.00 microCoulomb 1. What is the distance between the charges? 2. What

    asked on September 1, 2010
  99. physics

    a bike racer is riding on his new bike at silverstone. The track is 4km long. What is his average velocity over one lap?

    asked on January 27, 2010
  100. Math - Trigonometry

    What is the answer to (sin45) / (cos45)?

    asked on April 16, 2008


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