1. Chemistry

If a copper sample containing some zinc impurity is to be purified by electrolysis, the anode and the cathode must be which of the following? a. anode: pure copper cathode: pure zinc b. anode: pure zinc cathode: pure copper c. anode: pure copper cathode:

2. Math

What happened when the Crossword Puzzle Champion died?

3. Chemistry

If two salts AX and BX2, have the same Ksp values of 4.0x10^-12 at a given temperature, then A. their molar solubilities in water are the same B. the salts are more soluble in 0.1 M NaX than in water C. the molar solubility of AX in water is less than that

4. chemistry -check over work

Naphthalene (C10H8)is a solid aromatic compound often sold as mothballs.The complete combustion of this substance to yield CO2(g)and H2O(l)at 25 ْC yields -5154 kJ/mol. A. write balanced equation for the combustion of C10H8. C10H8+12O2->10CO2+4H2O ΔH

5. Chemistry

what is the molar solubility of lead sulfate in 1.0 X 10^-3 M Na2SO4? The Solubility Product Constant PbSO4 Ksp= 1.8 x 10^-8 The Ksp expression is: Na2SO4 = [2Na][SO4^-2] [2Na]=2x [SO4^-2]=x Ksp= 1.8 x 10^-8 = (x)(2x) Ksp= 1.8 x 10^-8 /4x^3 1.8 x 10^-8/4 =

6. chem

Briefly explain why the transitions associated with the Lyman series correspond to wavelengths in the ultraviolet region of the electromagnetic spectrum.

7. Physics

You want to take a full length photo of your friend who is 2 m tall, using a 35 mm camera having a 50 mm lens. The image dimensions of 35 mm film is 24 mm by 36 mm, and you want to make this a vertical photo in which your friend's image completely fills

8. trig help

verify that cos(A-B)/cosAsinB=tanA+cotB is an identity

9. Atomic physics

5)a. Electrons accelerated by a potential difference of 12.23 V pass through a gas of hydrogen atoms at room temperature. Calculate the wavelength of light emitted with the longest possible wavelength. b. Calculate the wavelength of light emitted with the

10. physics

A woman finds the front windshield of her car covered with ice at -12.6°C. The ice has a thickness of 4.80 10-4 m, and the windshield has an area of 1.25 m2. The density of ice is 917 kg/m3. How much heat is required to melt the ice?

11. Chemistry

If the concentration of a saturated solution of SrCO3 is 0.000040 mol*L^-1, what is the value for the solubility product constant of this salt. How do I start this please

12. Chemistry

The dissociation for a weak base BOH in water found to be 1.25 x 10^-6. What is the concentration of H+ in a 3.2M soluton of BOH.

13. physics

A law enforcement officer in an intergalactic "police car" turns on a red flashing light and sees it generate a flash every 1.5 s. A person on earth measures that the time between flashes is 2.9 s. How fast is the "police car" moving relative to the earth?

14. chemistry

using only the periodic table, write the expected ground-state electron configurations for: a. element number 116 b. an element with three unpaired 5d electrons c. the halogen with electrons in the 6p atomic orbitals

15. chem-help

the bright yellow light emitted by a sodium vapor lamp consists of two emission lines at 589.0 and 589.6 nm. what are the frequency and the energy of a photon of light at each of these wavelengths? what are the enegies in kJ/mol

16. Chemistry

What is the OH^- concentraton of a solution that is 0.10M in Na2C2O4? I have a couple of these concentration questions asking different things but I don't know how to do them

17. Macroeconomics

The following calculations help you see how the ratio of debt to GDP changes from one year to the next. Suppose that in a hypothetical country with a currency called the ducat, debt is equal to 140 trillion ducats and GDP is equal to 100 trillion ducats.

18. physics

A farm boy studying physics believes that he can fit a 15.0 m long pole into a 12.0 m long barn if he runs fast enough (carrying a pole). Can he do it? Explain in detail.How does this fit with the idea that when he is running the barn looks even shorter to

19. Chem II

Ammonia is a weak base. If Ammonium nitrate is added to it, the pH of the ammonia solution will _____________ (increase, decrease, stay the same)

20. physics

An owl has good night vision because its eyes can detect a light intensity as small as 5.0*10^-13 W/m2. What is the minimum number of photons per second that an owl eye can detect if its pupil has a diameter of 7.0 mm and the light has a wavelength of 545

21. Physics check

1)How is displacement different from distance? Under what conditions can an object travel a certain distance and yet its resultant displacement be zero? Displacement is a vector quantity while distance is a scalar quantity. If an object goes round-trip its

22. english - revise

Where do you normally find information for topics that interest you? how do you know when sources are reliable? Explain: In order to find information for topics that interest me, I will go to the University library. When using different sources such as

23. English expression

Hana Middle School This is our school. It's 37 years old. There are 780 students and 34 teachers. We have a computer center and a library. We have a gym and a music room, too. Our Classroom This is our classroom. There are 40 students in our class. Our

24. Chemistry

Equal volumes of 1 M BaCl2 and 1 M NaSO4 are mixed. What effect will the addition of more Na2SO4 solution have on the concentration of Ba^2+ remaining in solution? *No effect *increase the concentration of Ba^2+ ions *Decreases the concentration of Ba^2+

25. Chem II

Calculate the pH and percent ionization for the solution made up of 0.035 M NH3 and 0.015 M NH4Br.

Hi, in to Kill A mockingbird , can you please help me out, and tell me any significant events that happen in CHAPTER 23? I am suppose to explain why the events , important speeches in Chapter 23 are important. All I can really think of is that Attticus

27. Chemistry

Which one of the following salts is obtained by the reation of a weak acid with a strong base. MgCl2 NH4F LiClO4 NaCl K2SO3

28. Physics

The energy of the nth excited state of a hydrogen atom is proportional to 100 - (100/n2). 1) Using this formula, calculate the energy of the first five energy states. 2) How many spectral lines are possible for the transition of a photon in the n= 5 state

29. chemistry

Reaction 1: I2(aq)Cu^+2(aq) Ag^+(aq)Br2(aq) Column 1---Column 2---Column 3---Column 4---Column 5 I-(aq)---X---X---T---T Cu(s)---T---X---T---T Ag(s)---X---X---X---T Br-(aq)---X---X---X---X Reaction of metals and solution of ions Reaction 2:

30. science

unscrammble the word oucocbitinmulaa

31. English

How do you write a acrostic poem?

32. Physics

A 22.8 kg turntable with a radius of 47 cm is covered with a uniform layer of dry ice that has a mass of 4.08 kg. The angular speed of the turntable and dry ice is initially 0.52 rad/s, but it increases as the dry ice evaporates. What is the angular speed

33. Physics check

1)What can you say about the motion of a body if: a. its displacement-time graph is a straight line inclined with the time axis b. its velocity-time graph is a straight line inclined with the same axis. c. its velocity- time graph is a parabola A)The

34. Physics

A certain digital camera having a lens with focal length 7.5 cm focuses on an object 1.85 m tall that is 4.25 m from the lens. (a) How far must the lens be from the photocells? (b) How tall is the image on the photocells? Is it erect or inverted? (c) A SLR

35. Physics

What evidence can you cite for the wave nature of light? For the particle nature of light?

36. science(chem)

Can someone tell me if this objective for my lab report sounds alright? The objective of this multistep lab was to ultimately synthesize 4-bromo-2-chloro-6-iodoaniline through the intermediate formation of acetanilide, 4-bromoacetanilide,

37. chemistry

A weak base with a concentration of 1.3 mol/L has a percent ionization of 0.72%. What is the Kb of this weak base? could someone help me with this question or how to get started?

38. chemistry

calculate the equilibrium constant for the reactionas written at 940K. NH4Cl->NH3+HCl delta H= NH4Cl -1779, NH3 -46, HCl -92 delta s= NH4Cl - 682,NH3 192,HCl 187 i don't know how to solve for the equilibrium constant without the concentration of the

39. Physics

What does wave interference have to do with the electron energy levels in an atom?

40. English expression

What sport do you like best? I like rope jumping best. What sports do you like best? I like cricket and dodgeball best. Which sport do you like better, billiards or squash? I like billiards better. Do you play rugby sometimes? Yes, I do. Do you play sports

41. Physics

A skier starts at rest on the top of Mt Circular, a strange, smooth, icy hill shaped like a hemisphere. The hill has a constant radius of R. Neglecting friction (it is icy!), show that the skier will leave the surface of the hill and become air-borne at a

42. chemistry

Because solution pH is a measurement of either [H3O+] or [-OH] concentration, the acidic or basic nature of the acids and bases used in this experiment can be ascertained by inspecting just the density (electrostatic) potentials from the products (which

43. Physics

You want to take a full length photo of your friend who is 2 m tall, using a 35 mm camera having a 50 mm lens. The image dimensions of 35 mm film is 24 mm by 36 mm, and you want to make this a vertical photo in which your friend's image completely fills

44. chemistry

use and activity series to Identify two metals that will not generate hydrogen gas when treated with and acid write balanced molecular equations: aluminum metal with dilute nitric acid Write balanced molecular equations:Calcium hydroxide solution with

45. Biology-Smallpox

Who usually gets smallpox? Who's at risk, age groups or areas of the world

46. chemistry

The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.520. If a trial's absorbance is measured to be 0.275 and its initial concentration of SCN– was 0.00060 M, the

47. organizational theory and behavior

How has learning about Organizational Behavior given you a better understanding of organizations in your community? Has what you have learned about Organizational Behavior increased your interest in a future leadership or management role? Would you now

48. Physics

An electron (m=9.11 * 10^-31) enters a uniform magnetic field B=1.8T and moves perpendicular to the field lines with a speed v=0.92c. what is the radius of curvature of its path?

49. Chemistry

What does the density potential (also known as the electrostatic potential) measure? What do the colors on the images indicate?

50. chemistry

"Ag(s) reacts with none of the 4 (solutions of Ag^+2, Pb^+2, Cu^+2, Zn^+2}. So Ag(s) goes at the bottom of the table for now although there may be some metals below silver when you finish with the entire table. Cu(s) reacts with (Ag^+ solution) so Cu goes

51. PHYSICS

Oil is flowing with a speed of 1.30 m/s through a pipeline with a radius of 0.315 m. How many gallons of oil (1 gal = 3.79 10-3m3) flow in one day?

52. Math

In Music, What Does "Allegro" Mean?

53. English Expression

ex) Do you like baseball? Do you like jumping rope? Do you like jumping ropes? Do you like jump rope? Do you like rope jumping? Do you like skipping rope? Do you like rope skipping? --------------------- Instead of 'baseball', can we use all the other

54. Physics check

1)The velocity of sound in air is 332 m/s. If the unit of length is km and the unit of time is hour, what is the value of velocity? m/s 2)What conclusions can be drawn if a velocity-time graph is a curve? acceleration is not constant.

55. Physics check

A boy starts from point A and moves 5 units toward the east, then turns back and moves 3 units toward the west. What is the displacement in the position of the boy? 5-3=2 2 units east

56. chem

what colored lines are expected in the atomic emission spectrum for mercury?

57. Chem

In a molecular weight determination, a volume of an unknown gas effused through a small opening in 40 seconds while the same volume of O2 required only 20 seconds for effusion. Calculate the molecular weight of the unknown gas.

58. History

How did the consumer economy in the late 1800s effect American life?

59. Physics

A certain digital camera having a lens with focal length 7.5 cm focuses on an object 1.85 m tall that is 4.25 m from the lens. (a) How far must the lens be from the photocells? (b) How tall is the image on the photocells? Is it erect or inverted? (c) A SLR

60. calculus

Could somebody please check these for me? Solve the differential equation with the given initial solution. 1. (dy/dx)=(-y/3) for y(0)=10 my answer was y=10e^(-x/3) 2. dP/dt=P+4 for P(0)=100 my answer was P=104(e^t)-4 3. dz/dt=te^z for z(0)=0 my answer was

61. Geometry

Find the radius of a right cone with the slant height 21m and the surface area 168pi m^2

62. Spanish Homework

Estuve trastornado tan cuando mi hermano pidió que el hombre polaco saliera de nuestra casa. Entonces fui abajo al sótano a trabajar en mi preparación. Sin embargo, no era alegre. Deseé levantarme y bailar. Despejé tan mi escritorio, estaba parado

63. WORD PROBLEMS

AND THE LAST TWO ARE THE FOLLOWING: 9. MARTHA LIND RECEIVED ANOTICE SHOWING THAT HER EMPLOYER PAID THESE BENEFITS BASED ON HER 53,000 ANNUAL SALARY:8.7%, REQUIRED TAX BENEFITS, 6%; MEDICAL INSURANCE; 3% PENSION PLAN CONTRIBUTION; 5% VACAION AND HOLIDAY

64. English

How do you analyze a poem???...i always have trouble trying to understand the poem...especially metaphors because they have a different meaning then what the words means directly.

65. chem

why are the atomic emission line spectra different for each element?

66. math/trigonometry

solve secx/2=cosx/2 over the interval[0,2pi) without using a calculator

68. trig

write the expression sin4xsin5x as a sum or difference of trigonometric functions

69. calculus

from the equation: x^4 - i = 0 x^4 = i how do you get: The solutions are the fourth roots of i = cos(pi/2) + isin(pi/2) I don't understand how you get pi/2? please full and detailed explanation please.

70. Chemistry

How do you calculate the pH, pOH, [H3O] and [OH] for a 0.067 M solution of sodium iodate

71. chemistry

hey drbob222 do you think you could help me out with this lab. Lab: Electrolytic Cells Purpose: The purpose of this experiment is to test the method of stoichiometry in cells. Materials: balance steel can tin electrode power source wire lead (x2) tin (II)

72. Spanish

Estuve trastornado tan cuando mi hermano pidió que el hombre polaco saliera de nuestra casa. Entonces fui abajo al sótano a trabajar en mi preparación. Sin embargo, no era alegre. Deseé levantarme y bailar. Despejé tan mi escritorio, estaba parado

73. 6th grade math word problem

Mrs. Silva has 24 lillies to arrange in equal rows. Name all the possible of number of lillies she could have in each row.

74. english

In three of the last four presidential races, the winner of the Iowa Republican primary has not captured the Republican nomination. Therefore, the winner of the next Iowa Republican primary will not capture the Republican nomination. a) true beyond a

75. english

Michael Jackson has had more plastic surgery than anybody else in California. You can bet he’s had more than anybody in Connecticut! a) true beyond a reasonable doubt b) probably true c) possibly true or possibly false The answer is (C) possibly true or

76. AED

help! Is it best to adjust instruction to teach in accordance with individual learning styles, or should students experience and be encouraged to participate in activities that require learning styles other than those they naturally prefer? In other words,

77. Chemistry

What is the pH of the solution created by combining 2.00 mL of the 0.10 M base[ammonia] with 8.00 mL of the 0.10 M acid[acid acid]? I tried this problem so many times, but always got it wrong. It's a weak base and acid titration. but i don't know the

78. science

the movement of static electricity into an object is a(n)?

79. chemistry

I found a pattern and I was wondering if it applies to all reactions. The more times there is evidence of a redox reaction occuring for an element, the higher this element will be on the list?

80. math(did i do this right)

did i factorise this correctly?? 8h^2-4h 2h(4h-2) 8h^2-4h

3x - y = -4

82. Factoring

(100)d^2-(57.3)d= 0 solve for d. yes...I just can't figure out what number I'd use to factor this and it got bumped to the next page. I thought it was an easy question but... Thanks

83. trig

give the exact real number value without using a calculator sin[(cos^-1)(1/4)] sin[(tan^-1)(3/4)+(tan^-1)(12/5)]

84. chemistry

the s.p.h of iron is 0.405 J/g-K. how many joules of heat are needed to raise the temperature of 0.105 kg of Fe from 298K to 361.5K

85. math?? factoring

100N/m d^2 - 57.3d= 0 sigh...I can't figure out how to find d know it's factoring but as to actual number to factor out...not so sure. Thanks

86. mass media

If you have a population of 500,000 people how many to be sample to give a representative profile with only a 5% point margin of error ?

87. accounting

a) Use the following data to compute averafe revenues per store, capital spending per new store, and ending inventory per store. b) Assume 200 additional stores will be added by the end of year +1 and assume that each new store will be pen for business for

88. English Grammar

This school building is 37 years old. This is a 37-year-old school building. The boy is 13 years old. He is a 13-year-old boy. The is 170 cm tall. He is a 170 cm-tall boy. ---------------- Is each pair the same and grammatical?

89. english - after revision

In order to find information for topics that interest me, I will go to the University library. When using different sources such as website, library and articles, it is very important to know that each source has an author and which one is the most

asked by rose - Ms. Sue
90. Math

How could you use mental math to find 3x122?

91. english literature

i am writing a research paper about JOHN KEATS and his 3 works ( social political religious or any)_ but i didn't find some of the things about him. my question is: WHAT ARE THE SOCIAL POLITICAL AND RELIGIOUS CONTRIBUTION OF JOHN KEATS TO THE ENGLISH

92. math

how would I solve 5x+7=42

93. algebra 1

I'm having troubles with these problems from a packet I got: 1. 1/x^2-9 2. 2(x-1)^2-(x-1)-1 3. y^2(a-b)-(a-b) 4. c^2+c+1/4 5. (x+1)^2-3(x-1)+2 6. x^4-9x^2+20 7. y^2-1/6y-1/6 8. n^4+2n^2-3 Please help. Thanks.

94. chemistry

use and activity series to Identify two metals that will not generate hydrogen gas when treated with and acid write balanced molecular equations: aluminum metal with dilute nitric acid Write balanced molecular equations:Calcium hydroxide solution with

1.5 x 1.5 =

96. Western Civiliztion

In 1875, which of these four political philosophies best addresses the political realities of Europe? Why? ----------------------------------- 1. A group of Austrian conservatives, adherents to the principles advocated by Prince Clemens von Metternich: Our

97. social studies

List four major events from this lesson! Patriots at War

98. english

You expect to get forty miles to the gallon in that? Why, that old wreck has a monster V8; besides, it’s fifty years old and needs an overhaul. a) true beyond a reasonable doubt b) probably true c) Possibly true or possibly false The answer is (C)

99. english

. The number of cellular telephones has increased dramatically in each of the past few years. Therefore there will be even more of them in use this coming year. a) true beyond a reasonable doubt b) probably true c) possibly true or possibly false my answer

100. math

A cylindrical ring of thickness 3.5mm.Each ring has internal diameter 14 mm and external diameter 16 mm.Taking pie=3.14 calculate the volume of maetla in single link chain,writing your answer correc to 3 significant figs.

101. Science

After replicated a DNA molecule with two strands three times, how many molecules of DNA are formed? Is eight the correct answer?

102. spell

To be worryless, could mean life itself. Many people struggle through everyday life - Children, Bills, School, but most importantly money. The world has evolved around money, and i wish that people could be worry free, and didn't have to worry about money,

103. math (did i work this right)

if f(x)=2x-1 and g(x)=1/2(x+2) calculate a)f(3) b gf(3) a)f(3)=2(3)-1=5 b)gf(3)=1/2(3+2)=3 2(3)-1=5

104. algebra

Create an equation of a nonlinear function and provide two inputs to evaluate

105. Physics

A ball is thrown vertically upward with a speed of 1.53 m/s from a point 4.21 m above the ground. Calculate the time in which the ball reach the ground. I'm figuring I have to do something with 9.80 which is gravity but I don't know what.

106. math

how do i expand and simplify (2x+5) (3x-4)

107. 1984

1.What is Orwell's version of history prior to his own time? My answer: I don't understand this question. 2. How many of Orwell's predictions have come true? My answer: I don't think many of Orwell's predictions have come true. The thought police and the

108. math

how do i factorise: a)5a^2b+ab^2 b)9k^2-1 c)2y^2-5y+2

109. statistics

If you have a population of 500,000 people how many to be sampled to give a representative profile with only a 5% point margin of error ?

110. algebra

what is the solution to 8/9(b-72)

111. biology

Can someone help me find information to refute or support that without the invention of the mircscope, the cell theory would not have been possible.

112. Physics / Dynamics

An object is 6000 mi from the surface of a 4000 mi diameter planet. If the relative speed is 12000 mi/hr and the surface gravity of the planet is 12.9 ft/s^2, determine the impact velocity at the surface. Given answer: 15460 mi/hr Thanks in advance.

113. Physics

A free nuetron can decay into a proton, an electron, and a neutrino.Assume the neutrino's rest mass is zero, and the rest masses for proton and electron are 1.6726*10^-27 kg and 9.11*10^-31 kg. Determine the total kinetic energy shared among the three

114. English grammar

I would recommend parents to use articles that are written by college professors, a doctor in education, or a specialist in child development, since these are more credible articles than articles written by parents or family members.

115. Math

What happened after Chief Short Cake died?

116. Chemistry

All of the following species would be expected to be able to function a Lewis bases EXCEPT a. F- b. O2- c. OH+ d. H2O BF3

117. algebra

Create an equation of a nonlinear function and provide two inputs to evaluate

118. chemistry

I need an edible suspension for a project i am doing.

119. Chemistry

The Rydberg equation (1=Rni 2–Rnf 2) can be treated as a line equation. What is the value of nf as a function of the slope (m) and y-intercept(b)? A. (mb)^1/2 B. (–mb)^1/2 C. (mb)^1/2 D. mb E. –mb^2 F. None of these are correct.

120. english

Although Max bled profusely before he died, there was no blood on the ground where his body was found. Therefore, he was killed somewhere else and brought here after the murder. a) true beyond a reasonable doubt b) probably true c) possibly true or

121. english

The annual rainfall in California’s north valley averages twenty-three inches. So the rainfall next year will be twenty-three inches. a) true beyond a reasonable doubt b) probably true c) possibly true or possibly false The answer is (C) possibly true or

122. english

The New York steak, the Maine lobster, and the beef stroganoff at that restaurant are all exceptionally good. All the entrees are excellent. a) true beyond a reasonable doubt b) probably true c) possibly true or possibly false my answer is "C"

123. AP HISTORY

What was the least common and least sucessful form of slave resistance pre civi war?

124. AP HISTORY

Who were most slaves in the South owned by?

125. english

. Since the graduates of Harvard, Yale, Princeton, and other Ivy League schools generally score higher on the Graduate Record Examination than students from Central State, it follows that the Ivy League schools do more toward educating their students than

126. english

Relax. The kid’s been delivering the paper for, how long? Three, four years maybe? And not once has she missed us. The paper will be here, just wait and see. She’s just been delayed for some reason. a) true beyond a reasonable doubt b) probably true c)

127. WORD PROBLEMS

5. THE UNIT COST OF A BEGINNING INVENTORY OF 405 UNITS IS zzz\$15.16. TH EUNIT COST OF THE LAST 600UNITS PURCHASED IS \$16.81 . USE FIFO TO FIND THE VALUE OF THE ENDING INVENTORY OF 170UNITS. 6. MXV PRODUCTS USES A COMPUTER PROGRAM TO SCREEN JOB APPLICATION

128. WORD PROBLEMS HELP

CAN SOMEONE PLEASE HELP ME WITH ASSISTENCE ON THE PREVIOUS PROBLEMS....OR SHOW ME HOW OR WHAT FORMULA TO USE.....ANYTHING IS HELPFU.

129. english

• The article I chose is: how stuff works – communication. The type of introduction that the writer used was to include interesting facts about the subject. He also gave animated illustrations to show how telephone communication works. The kind of

130. Media- help with a reference

I'm currently writing an essay for university but have a slight problem with one of my references. The source comes from a book called Screen Violence which is a collection of essays, edited by Karl French. The piece that I am referencing from is an

131. biology

explain why the movement of chlordie ions and water is reduced in a person with cystic fibrosis. please could someone help me! thanks

132. math

solve the simlutaneous equation: x^2= 4-y x= y+2

133. grammar

could you explain the difference of seen and saw.Thankyou.

134. math

simplify: a^2+4a/a^2+3a-4

135. math

fatorise: a)x^2-5x b)x^2-81

136. math

solve the equation 4x+5/4 - 9+2x/3=0

137. math

given that l=-2, m=3 and n=7 calculate the value of: lm(m-n)

3x - y = -4

139. literary

My daughter has to write an advertisement using 3 different propaganda techniques. I cannot find a definition or sample of propaganda techniques..can you help?

140. Math Help Needed

I need to figure out a pattern (using an algebraic expression) that will get me from: 1 to .01, 2 to .02, 3 to .04, 4 to .08, etc. all the way to 25 to 153,948.16! HELP

141. Maths

Given y2 wirte down the value of y: y2 = 81 y2 = 25 y2 = 16 y2 = 100 y2 = 4 y2 = 16

142. mass media

If you have a population of 3,000,000 people, how many to be sampled to give a representative profile with only a 5% point margin of error?

143. mass media

If you have a population of 1,000,000 people, how many to be sampled to give a representative profile with only a 5% point margin of error ?

144. math

Explain how to reflect a polygon over the X axis and the Y axis.

145. algebra 1

c^2+c+1/4 I don't understand how to do that equation.

Vikings

147. math (repost)

if f(x)=2x-1 and g(x) 1/2 (x+2) calculate a)f(3) now if 2(3)-1=5 how do i find for gf(3)????

148. English

hi i would want to know good websites for research about Mid summer night stream as we are going 2 start reading that book and so my teacher wants a little summary about it??

149. maths (is this correct)

calculate the exact value of 4 1/5 - (1 1/9 * 3)is it=39/45

150. AP Chemistry

Hey I have the AP Chem test coming up and i was wondering where I could find the answer key to some of the AP Chemistry tests like 1994, 1999, and 2002 MC and FR

151. Statistics

If you have a population of 1,000,000 people, how many to be sampled to give a representative profile with only a 5% point margin of error ?

152. statistics

If you have a population of 3,000,000 people, how many to be sampled to give a representative profile with only a 5% point margin of error?

153. Math

Franca Traveled 6.8km from one town to another Town. Where might Franca have traveled.

154. geometry

What are the names of the faces of a pyramid?

155. religion

The basis of Jewish faith is found in which part of the Bible?

156. A

What is the translation of: The product of 32% of some number (q represents some number)?

157. spell

I have a question for language arts. My question is that I got this homework saying Each word below is misspelled. Rewrite each word correctly. And the words are rippol_____ sampel_____ rurol______ jewle______ raffel______ plurel______ royle_______

158. math

what is 4.48586766654575855656?

159. Science

How is yeast considered a fungus?

160. Math

How could you use mental to find 5x306?

161. socila studies

the pros and cons of oil issues

162. chemistry

for the redox k lab there are also two questions.. drbob222 do you think you could help Question: 1. Of the reactions that occurred spontaneously in the individual tables, what types of qualitative changes would you observe that would indicate the reaction

163. English expression

1. I like fully ripen persimmons. 2. I like well-grown persimmons. Are they have the same meaning? What is the English word for a persimmon which feels smooth and well ripen so that people can eat with ease? Do you have a special term for that?

164. english

The sign on the parking meter says “Out of Order,” so the meter isn’t working. a) true beyond a reasonable doubt b) probably true c) possibly true or possible false my answer is "B" please help

165. Biology-Bacteria

What are the two basic ways that bacteria cause disease? Thanks

166. Social Studies

Did the colony of Virginia want to be free from England?

167. trig

1-tan^2x/ 1-cot^2x = 1-sec^2 x

168. algebra1

If there are 700 people in the town, how many people have both cats and dogs? 22% has both cats and dogs. I am having trouble because i keep coming up with 1.54. Just don't seem correct.Help!

169. Social Studies

What laws regulate media censorship?

170. english

When liquor was banned in 1920, hospitalizations for alcoholism and related diseases plummeted; in 1933, when Prohibition was repealed, alcohol-related illnesses rose sharply again. Legalization of cocaine, heroin, and marijuana would not curb abuse of

171. english

First, it seems clear that even if there are occasional small dips in the consumption of petroleum, the general trend shows no sign of a real permanent decrease. Second, petroleum reserves are not being discovered as fast as petroleum is currently being

172. SCi

What carbohydrates are, the difference between simple and complex carbohydrates, how sugars are broken down and used in the body, the benefits that carbohydrates provide to the body • Give examples of foods that are considered healthy sources of

173. WORD PROBLEMS

I JUST NEED HELP IN DECIDING WHICH WAY TO SOLVE. I LIKE TO SOLVE THEM BUT I AM HAVING TROUBLE SETTING THEM UP... 1. THE BOARD GAME SKRIBIN HAS DAILY SALES OF 12UNITS. IT TAKES 28 DAYS TO RECEIVE A NEW SHIPMENT. NO SAFETY STOCK IS PURCHASED. WHAT IS THE

174. Maths

The weight of a termite mound (y) in kilograms is measured each month (x) after it was first found. The mound after 1 month is found to be 2 kilograms and after 3 months it is measured at 18 kilograms. It is believed that the model connecting the weight of