# Lucy

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.

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

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

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.

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?

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

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.

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?

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

10. ## maths

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

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.

If cos theta = 0.8 and 270

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!

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

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

17. ## math

what is 2.47 rounded to the nearest tenth?

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

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?

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

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

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)

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.

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

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.

26. ## World History

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

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.

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 MgCO3.am i right or wrong

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.

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

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

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?

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

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

35. ## chemistry

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

36. ## chemistry

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

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

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

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

40. ## ochm

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

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 ?

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

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

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

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

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.

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!

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

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

50. ## Health Sciences

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

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

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?

53. ## ipc

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

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

55. ## Algebra II

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

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

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

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

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

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

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?

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.

63. ## Math 143

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

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

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

66. ## chemsitry

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

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

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

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?

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%

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

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

73. ## Algebra II

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

74. ## Biology

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

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.

76. ## Chemistry

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

77. ## Maths

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

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

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

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

81. ## Math

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

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

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.

84. ## Music

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

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

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

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

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

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

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

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?

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.

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?

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.

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.

96. ## poetry

a face by marianne moore

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

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