1. Math

Solve by substitution: x + 2y =1 8x + 8y =4

2. AP BIO

1. A biologist measured the amount of DNA in several single diploid cells taken from a culture. He knew that these cells could divide mitotically, but not meiotically. His data is shown below: Cell Number and DNA content in micrograms: Cell 1 (11.1

3. AP BIO

2. Suppose the DNA molecule were composed of six monomers. In addition to the monomers A, T, C and G, two other monomers, O and P, were present. Furthermore, O and P were known to pair only with each other. Which of following statements regarding this kind

Write an essay of about 300 words in which you describe in detail what constitutes a case study together with explaining what is analysis and types of input text in business case analysis.

5. ap physics

A skier of mass 70.5 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 60 m up a 38° slope (assumed to be frictionless) at a constant speed of 2.0 m/s?

6. ap physics

If one micrometeorite (a sphere with a diameter of 1.0 multiplied by 10-6) struck each square meter of the moon each second, it would take many years to cover the moon with micrometeorites to a depth of 1.5 m. Consider a cubic box, 1.5 m on a side, on the

7. College Physics

If you slam your finger in a car door how can you thank Coulomb's Law for the fact your finger wasn't chopped off? I don't understand.

8. Travel Agent

A ______ is the most commonly used input device.

13. geometry

what is the area and the perimeter of a square farm lot whose side mesure 21 m?

14. calculus

A cold metal bar at -30 degrees Celsius is submerged in a pool maintained at a temperature of 40 degrees Celsius. Half a minute later, the temperature of the bar is 20 degrees Celsius. How long will it take the bar to attain a temperature of 30 degrees

15. Chemistry

Aspirin equilibrium is : HC9H7O4(aq) + H2O (double arrow)C9H7O4^-(aq) + H3O^+ You have 2 tablets each containing 0.325g of active ingredient that you dissolve in water up to 225ml. Calculate the pH.

16. Physics

The heat capacity of a mercury thermometer is approximately equal to the volume immersed in metre cube multiplied by a constant x. If the densities of glass and mercury are 2.40 x 10^3 kgm^-3 and 1.36 x 10^4 kgm^-3 and their specific heat capacities are

17. Physics

24 kg of water are heated by a thermostatically controlled 4Kw electric heater. The thermostat switches the heater on at 60 degree centigrade and off at 65 degree centigrade. If the time between switching off and switching on is 3.0 min, what will be the

18. Physics

Two spheres S1 and S2 of the same metal and having the same type of surface, have radii 20cm and 10cm respectively. Compare their rates of fall of temperature as they cool (a) when S1 is at 50 degree centigrade, S2 is at 40 degree centigrade, the

19. math

solve with addition: -3x + y = 3 2x- 3y = 5

20. British Literature

Hello. I was wondering if someone can review my attempt to scan & indicate the ryhme scheme of the following lines from John Keats's "Ode on a Grecian Urn" ? When / old age / shall this gene/ration waste, ___ Thou/ shalt re/main, in mid/st of other woe ___

21. Physics

An advertisement claims that a particular automobile can "stop on a dime". What net force would actually be necessary to stop an automobile of mass 850Kg traveling initially at a speed of 43.0 km/h in a distance equal to the diameter of a dime, which is

22. chemistry

Starting with o.3700 mol CO (g) and 5.400*10^-2 COCl2 (g), in a 3 liter flask at 668 K, how many moles of Cl2 will be present? CO + Cl2 =++COCL2 KC = 1.2*10^3 at 668 K

23. History

Analyse the view that decolonisation was the product of a combination of forces beyond the British government's control.

24. English

I just want you to check my word choice. There are a few sentences I rephrased I'm not sure of.(Sentences 2.3.4). I really hope you'll help me improve my writing skills. Thank you for your help. 1) His father was a German from Bremen, who first settled in

25. English

I forgot to include these sentences. If you could possibly tell me if they are OK? I'm preparing a dissertion on this as part of my university course. 7) In addition, he told him that only desperate men and very fortunate men went abroad, he said. He was

26. Accounting

A company leases a piece of equipment to another company and appropriately records the 10 year lease as a sale. I have to determine the amount of profit to record in the first year - The lease payments are 500,000 for 10 years. The cost of the equipment is

27. Happy Pi Day

Happy Pi Day to all math "nerds" Even Google changed their log today. http://www.squidoo.com/PiDay

28. world history

Under whose reign did the Persian empire become the greatest military power of the ancient world?

29. Stress

I'm having a tough time brainstorming ideas about the four stress factors. I have to know why it's important for people to learn to deal with stress. Then I need to describe social, mental, emotional, and physical stress factors and its impact on living.

Light, XRays, and radio waves contain _____________ with different amounts of energy.

When the frequency of a note is twice the frequency of another, the notes are a(n) ______________ apart.

32. college

The diameter of a wire should be 8 cm. It follows a normal distribution and has a standard deviation of 0.01 cm. A person tests each delivery by taking 5 samples, accepting the goods only if the mean is at most 8.01 a) Find the probability of type 1 error?

33. social studies

how did the events in Kansas contribute to the onset of the Civil War?

34. social studies

what did freedom to former slaves and how did their lives change in the aftermath of the civil war? also could the federal government have done more to helpp southern africa americans after the civil war? please explain

35. science

I am doing a project on paper planes, and I don't know what they mean by indepent and dependent variable, I know I want to see what flies further, a light weight paper plane or a plane made of heavier paper, but then they ask about the dependent and

36. physic

A long jumper's take-off velocity is 10 m/s at an angle of 20o to the horizontal. His centre of gravity is 1 m above the ground at take-off and is 0.5 m above the ground at landing. a)How far does he displace his centre of gravity horizontally between

37. chemistry

how many grams of solute are in 250ml of 0.500M glycerin . (C3H8O3=92.1 amu)?

It's a lot of words, but short questions. I got most of it, but I'm confused on a and c. Help would be greatly appreciated: Theater Seven wants to increase its popularity. They want to determine the best number of newspaper (N), Radio (R), and Television

39. algebra

write a quadratic equation having the given numbers as solutions 6 - sqrt(2) , 6 + sqrt(2) thanks for any help

40. college physics

You are the design engineer in charge of the crashworthiness of new automobile models. Cars are tested by smashing them into fixed, massive barriers at 50 km/h (31 mph). A new model of mass 1400 kg takes 0.18 s from the time of impact until it is brought

41. college physics

From what maximum height can a 61 kg person jump without breaking the lower leg bone of either leg? Ignore air resistance and assume the CM of the person moves a distance of 0.65 m from the standing to the seated position (that is, in breaking the fall).

42. Physics

An electron and a proton execute uniform circular motion in the presence of a uniform magnetic field. If the radius of the circle is the same for both particles, which of the following statements is true? A)Both particles move in the same direction; the

43. statistics

2. The daily maximum temperature (T) on an island has approximately a normal distribution with a mean of 78 degree (F) and a standard deviation of 5 degree F on what proportion of days is the maximum temperature: a. Greater than 70 degrees F b. Greater

68. physics

The CM of an empty 1300 kg car is 2.40 m behind the front of the car. How far from the front of the car will the CM be when two people sit in the front seat 2.80 m from the front of the car, and three people sit in the back seat 3.80 m from the front?

69. economics

concepts and problems in Macroeconomics Ireland's high unemployment rate

70. Trig

How do I solve the following? sec 3 theta/2 = 2 on the interval 0

71. algebra

5 Times the numerator of the solution to 7|8-3h|=21h-49

72. french

what does nous avons bu un cafe mean?x

73. English

Thank you for your corrections! I wonder if you could possibly have a look at these other sentences on Defoe's Robinson Crusoe. My doubts concern the words preceding the question marks. Thank you very much for being so cooperative. 1) He attacks them and

74. Literature

Can someone give me some comparisons between Leopold (Sand County Almanac) and Thoreau (Walden Pond)? Similarities and Differences.

75. Biology

11. You are searching for a gene that traces its ancestry to an ancient gene in fish. Evolutionarily older fish, like the coelacanth, have only one copy of this gene. More modern fish, like a three-spine stickleback, have three. Modern humans and mammals

76. Chemistry

The active ingredient of the antacid is CaCO3 and so Sally chose titration with HCl as a method for analysis. What is the mass (in g) of the CaCO3 in the sample of antacid, if it is titrated by 21.2 mL of HCl solution with concentration of 0.1048 mol/L to

Frank wants to buy a $10,000 car. The car dealer offers him financing of 60 payments at 9% interest. What will his payments be assuming he pays$0 down?

78. Physics

A 40 W (120V) light bulb has a tungsten filament of thickness 0.035 mm. The filament's operating temperature is 1500 degrees C. PART A How long is the filament? PART B What is the resistance of the filament at 20 degrees C?

79. Math

How do you plot the y-axis of a 15 by 15 square graph with the points ranging from 0.1 to 27.8?

80. maths

Grace has 16 jellybeans in her pocket. She has 8 red ones, 4 green ones, and 4 blue ones.What is the minimum number of jellybeans she must take out of her pocket to ensure that she has one of each color? ( could you tell me the steps ) thanks.

81. Geometry

The area of a circle that has a circumference of 12 pi cm is ______ pi m squared?

82. geometry

A type of pyramid where all faces are triangles?

83. chemistry

what is the pressure of H2 if the hydrogen gas collected occupies 14L at 300K and was produced upon reaction of 4.5 mol of Al?

87. Prin of finance

Which of the following statements are true of a “two-for-one stock split?”: 1. It may signal higher future earnings 2. By creating more shares at a lower price, marketability may be improved 3. It increases the “Equity Section” of a company’s

99. 425 SOC

Does anyone think that a child should witness "good and bad" circumstances? Is it good for a child to see different perspectives of "reality" or no?

100. math

A pet shop has a total of 17 dogs and birds. Altogether there are 48 feet. How many dogs are there and how many birds?

101. chemistry

did i order the intermolecular forces correctly ion-ion > ion-dipole force > dipole-dipole >ion-induced dipole> dipole-induced dipole> hydrogen bond>dispersion bond

102. Math

What is 38 tmes 93 divided by 3 minus 4

103. Social Studies

Is this true or false: The radio business and the record business are interdependent; they have strong ties between them. i think its true and also is this true or false Radio programming can derive from locally produced, syndicated or network programming.

104. Math

Expand: log7= 3sqrtx / x^2y

105. computers

How does a computers benefit from having all in one computer security systems installed?

106. physics

In a ballistic pendulum experiment, projectile 1 results in a maximum height h of the pendulum equal to 2.4 cm. A second projectile causes the pendulum to swing twice as high, h_2 = 4.8 cm. The second projectile was how many times faster than the first?

107. chemistry

is Li3As a semiconductor

108. chemistry

what is the pH of .28 M HNO3 (aq) at 25 degree celsius? (Kw = 1.0 x 10 ^-14)

109. Writing

Could someone please help me write this sentence/sentences and punctuate it properly: Additional key questions answered by the management plan include: how the work is to be completed to achieve the project goal, how the changes will be monitored and

110. English 1

Revise the following paragraph, improving it without changing its overall meaning. Pay particular attention to any potential sentence fragments. Cooking is not as easy as it looks. For example, the terminology. Selecting the freshest ingredients for

111. chemistry

a scientist wants to make a solution of tribasic sodium phosphate ,Na3PO4, for an experiment. how many grams of Na3PO4 will be needed to produce 750 mL of a solution that has a concentration of Na+ ions of 1.30M

112. 425 SOC

I need help Identifying the attitude, values, and ideologies that tend to perpetuate gender inequality?

113. Social Studies

Why is school desegregation an important piece in the struggle for civil rights? Also, how did this change people's point-of-view toward race relations in American? Thanks

114. English 1

Identify the sentence that is not a run-on a)Some people are real risk-takers; my cousin loves sky diving. b)My cousin loves sky diving yes some people are real risk-takers. c)Some people are real risk-takers my cousin loves sky diving. d)Some people are

115. history

how would you describe how you spied for the colonist in the american revolution

116. english1

Identify the complete verb: Max will be arriving on a flight this afternoon. a)will be b)will c)arriving d)will be arriving I think the answer is d.

117. finanance

2. You charged $1,000 on your credit card for Christmas presents. Your credit card company charges you 16 % annual interest, compounded monthly. If you make the minimum payments of$25 per month, how long will it take [to the nearest month] top pay off

118. dulaney hi

what is the maxium mass of chlorine that could be released in the stratosphere by 100g of ech compound

119. Chemistry

what is the chemical formula for Petrolatum and Petroleum Distillates?

120. Math

unscramble the letters UEEMTTRARR to make a math word

121. chemistry

Aqueous solution with a pH of 10.6 is diluted from 1 L to 1.5 L. What is the pH of the diluted solution?

122. English

Identify the sentence with correct subject-verb agreement. a)The crowd was yelling, "De-fense, de-fense." b)The crowd were yelling, "De-fense, de-fense." c)The crowd are yelling, “De-fense, de-fense.” d)The crowd yelling, “De-fense, de-fense.” I

123. macroecon

Assume that there is equilibrium in both the goods and the money market at all times. Suppose that the president of the United States has decided to start a war. The government will have to increase spending to pay for weapons, equipments, and

124. Math

Write the numeral in base ten. 130five A) 40 B) 60 C) 640 D) 650 I got A)40

Assignment: Developing Good Business Sense – DUE DAY 7 in IF · Resource: Ch. 12 of Introduction to Business · Read the Developing Good Business Sense activity on p. 394 of the text. · Answer Questions 1–4 from the activity in a 700- to 1,050-word

126. Math

solve by addition method: please show work. -3x + y = 3 2x -3y =7

127. CHEMISTRY

Which of the fallowing compounds may be Arrhenius acids: CH4, SO2, H2S, Ca3(PO4)2 Can you please explain how you got the answer because I don't understand how you can tell.

128. chemistry

What is the mass of a mole of electrons if one electron has a mass of 9.11 x 10^-28 g?

129. English

Thank you very much. I was pleased I didn't make any mistakes this time. I still have a few more sentences I forgot to post to you. 1)The hero of the novel was always the bourgeois man with his problems. He was generally the mouthpiece of the author. The

130. math

give the prime factorization of 189

131. CHEMISTRY

Methylamine (CH3NH2) forms hydroxide ions in aqueous solution. Why is methylamine a Brønsted-Lowry base but not an Arrhenius base? I need help on this question. Please explain this to me!

132. Math

A pet shop has a total of 17 dogs and birds. Altogether there are 48 feet. How many dogs are there and how many birds? A) 7 dogs and 10 birds B) 9 dogs and 8 birds C) 6 dogs and 11 birds D) 8 dogs and 9 birds I got the answer C is this right?

133. chemistry

The vapor pressure of water at 30 Celsius is 31.82 mmHg and the density is 0.9956 g/mL. What is the new pressure after adding enough sorbitol to make a 2.7 m solution?

134. algebra

I have tried this problem over and over and just not getting how to do it can someone help I don't want the answer I just need showed how to do it. solve using the formula L 0.000169d^2.27/h where L is the proper length in feet of the letters on pavement,

135. english1

Identify the sentence with correct pronoun-antecedent agreement. a)Neither of the boys submitted his essay on time. b)Neither of the boys submitted their essay on time. I think it is b but i am not sure.

136. modern science

can someone pleaseexplain to me what cathodic protection is and how it works? i understand that a metal gets charged but what does that do? Thank you =)

156. statistics

refer to a bag of marbles containing 5 green marbles, 4 red marbles and 2 yellow marbles. Three marbles are drawn from the bag, without replacement. What is the probabilty that all three marbles drawn are green?

157. Base

Write the numeral in base ten. 130five

158. cjs/200

Describe the purposes of criminal law.

159. Calculus

Need the answer to find dy/dx y=(1+cos^4(t/12))^3

160. Writing

23. Which portion of this sentence followed by a letter is not parallel? The company president inspired his employees (A), charmed the press (B), and redefined his company's strategic plan (C). __A __B __C __No error

161. Writing

31. I had hoped the police would blame Bruce, not ___. __ me __ myself __ mineself __I 32. Some interviewers ____ have a clear sense of what they want in an employee, ask very tough questions. __ who __, who __ which __ that 33. A venture capitalist has to

162. chemistry

There is 0.150 moles of H2 and I2, and are brought to equilibrium in a 3.30 L flask. The equation is H2 + I2 = 2HI. Find the equilibrium amounts of H2, I2, and HI. I'm not getting the correct answer. I set up the formula as x^2/(.04545-x) (.04545-x). To

163. Science

I am making a pedigree and I want to know what do you call a person that Talks Alot????

164. Social

Ia Rush Limbaugh, as carried on WBEN radio in Buffalo is an example of network programming and is All things Considered", as carried by WBFO in Buffalo is an example of network programming as well

165. CHEMISTRY

Which of the fallowing compounds may be Arrhenius acids: CH4, SO2, H2S, Ca3(PO4)2 Can you please explain how you got the answer because I don't understand how you can tell.

166. Calculus

need answer to find dy/dx y=e^2x+3*e^x-1

167. CHEIMSRTY

Methylamine (CH3NH2) forms hydroxide ions in aqueous solution. Why is methylamine a Brønsted-Lowry base but not an Arrhenius base? I need help on this question. Please explain this to me!

168. Writing

Can you please tell me whats right and whats wrong..Thank you. Part I: True or False 1. The following word group is a FRAGMENT: That movie, one of my favorites. _x_True __False 2. The following word group is a FRAGMENT: The local baseball team, needing a

169. social

Are both these false? A unique format is one for which there is no similar competition in the market. A) True B) False I also think this one is false but again not sure A "head to head" format refers to a format that is trying to successfully program

170. Math

Perform the indicated operation let f(x)=x^2-7x-9 find(a+h)-f(a) and simplify

171. mental factors

I don't really get mental factors of stress. I need more clarification of this and figure out its impact on living.

172. math

How do I solve the equations using the elimination method: .3x-.2y=4 and .4x +.3y= 49/23 Normally I would multiply the decimals by 10 to make them whole numbers, but that fraction is really throwing me off. What do I multiply to eliminate that fraction?

173. Calculus

suppose that f(5)=5 and the limit as x->5 is 4f(x)-20/(x-5)(x+5)=10 find derivative of the function.

174. math

A baseball is thrown straight up from the rooftop 192 feet high. The function s(t)=16t^2+-64t+192 describes the ball's height above the ground,s(t), in feet, t seconds after it was thrown. How long will it take for the ball to hit the ground? Explain

175. Chemistry

Which of the following systems could act as a buffer? A. HCl/Cl- B. NaOH/OH- C. HSO4-/SO4-2 D. H3O+/OH- E. All of the above my guess is C because A and B are too strong, but I am unsure of D. Can someone explain how to think through this?

176. stats

what is the probability that at least one of the marbles drawn is green? I thinks it's 1/11 but not sure. Then what is the probability that only one of the marbles drawn are green?

177. calculus

Find derivative(use logrithmic functions). y=x^-cosx

178. Math

From a base elevation of 7000 ft, a mountain peak in colorado rises to a summit elevation of 14507 ft over a horizontal distance of 15842 ft. find the grade of the peak.

179. science

how does newton's laws apply to a toothpicks bridge

180. History

factors that led to the creation of Isreal and the outbreak of the 1948-49 war

181. history

does any side in the Chechen conflict hold the high ground morally? Have recent developments increased the likelihood of peace in CHechnya?

182. physics

projectile motion question need help working through it an airplane travelling 1001meters above the ocean at 125km/h is going to drop a box of supplies to shipwrecked victims below. a) How many seconds before the plane is directly overhead should the box

183. history

What problems did South Africa face in its transition to demacracy? What have been the magor achievments and problems in the new South Africa?

184. Chemistry

What is the structure of a tripeptide where glycine is first, serine is second, and alanine is third. Draw the structure in the proper zwitterionic form.

185. Chemistry

100 mL of each of the following solutions is mixed; which one of the mixed solutions is a buffer? A) 1.0 M NH3(aq) + 0.6 M KOH(aq) B) 1.0 M NH4Cl(aq) + 1.0 M KOH(aq) C) 1.0 M NH3(aq) + 0.4 M HCl(aq) D) 1.0 M NH4Cl(aq) + 0.4 M HCl(aq) E) 1.0 M NH3(aq) + 1.0

186. Algebra

Solve the poloynomial x^3+4x^2-x-4=0

187. math

1. Imagine you are in the market for a new home and are interested in a new housing community under construction in a different city. a. The sales representative informs you that there are 56 houses for sale with two floor plans still available. Use x to

188. Gen 200

Prepare a 700 to 1,050-word paper in which you explain the relationship among professional values, ethics, and career success. Address the following items in your explanation: Define values and ethics. Identify at least three sources of professional values

189. Chemistry (or Physio/Biochem)

Asthma affects about seven percent of the population. During an asthma attack smooth muscle cells in the bronchi constrict, the airways become inflamed and swollen, and breathing becomes difficult. What effect might an asthma attack have on blood pH? A. pH

216. Chemistry

If 4.56 grams of NaOH and 56.3 grams of Ca(OH)2 are added to enough water to make 1.50 L of solution, what will the pH be?

217. Chemistry

Determine the concentration of Mg2+ (in mmol/L) in the unknown solution (Note: details and additional information to solve the problem are provided in your lab manual): Mass of EDTA: 0.606 g Volume of EDTA used in titration (step 1): 10.48 mL Volume of

218. math

Theses are just some problems i did not understand how to do so if you could please explain and write the answer(: anything helps thank you(: 2. Simplify ---(3x^11z^5)^3 b. (3x^5)^ -3 / 2x-5(3y)^4 c.3x^5)^ -3 / 2x ^ -5(3y)^4 (same as b but - 5 is the

219. Intro to LAN technologies

58. You have been contracted to build a network for a multimedia development firm that currently uses a 10-Mbps Ethernet network. The company requires a high-bandwidth network for the multimedia team, which constantly views and manipulates large files

220. College Physics

A 3400 kg open railroad car coasts along with a constant speed of 7.50 m/s on a level track. Snow begins to fall vertically and fills the car at a rate of 5.10 kg/min.Ignoring friction with the tracks, what is the speed of the car after 85.0 min ?

221. scienc

Resources: Ch. 5 of Visualizing Environmental Science and Appendix C „h Due Date: Day 2 [Main forum] „h Review Ch. 5, The Flow of Energy Through Ecosystems. Then, complete Appendix C. „h Post your response to the following: Identify the fruit or

222. social

Ok, I think both of these are syndicated but im so confused! The type of programming aired by a station with which they "affiliate" is called A) syndicated programming B) local origination C) network programming D) non of the above This type of

223. history

I need help on these questions. I'd really appreciate if Ms. Sue helped me out, since she's an awesome tutor. =) 1. In their 1994 Contract with America, Republicans pledged to A. renew the "Star Wars" initiative (what is the "Star Wars" initiative anyway?)

224. econ

Consider the following data about the goods market in a hypothetical closed economy. Assume that government expenditure is constant at \$200 million. Also assume that there is equilibrium in the goods market at all times. Some of the pairs of interest rate

225. Chemistry

A 25.00 ml sample of a standard solution containing 1 g of CaCO3/L required 25.20 ml of EDTA to fully complex the Ca present. Calculate the volume of EDTA stoichiometrically equivalent to 1.0 mg of CaCO3. From the volume of EDTA required in titrating the

226. english

the activity of scaling rocky cliffs

227. compose

How many kilojoules of heat are released when 25.0 g of {\rm CO}(g) reacts completely with {\rm H_2}(g) to form {\rm CH_3OH}(g) at constant pressure?

228. physics

A 17.1 cm focal-length lens is used to project 35 mm slides onto a screen 4.77 m from the projector lens. What must be the width of the screen ( m) if the image of the slide is to just fill the screen? The width of the image on the slide is 34.3 mm.

229. Coom 220

How do you know when sources are reliable?

230. chem

why does the temperature decrease as the internal energy of a system decrease?

231. ECONOMICS

WHAY IS GLOBAL ECONOMIC CRISIS?

232. Algebra

41-(2x+4)< or + to 2(x+1)+x Use set-builder notation to describe the complete solution. {x/x__ __}

233. trig

how do you simplify "[sin(x)+tan(x)]/[1+sec(X)]"

234. Chemistry

Suppose that we had used 25.5cm3 of 0.200M NaOH and 42cm3 of dilute HCl to reach the end point. What is the molarity of the Hcl acid? HCl = NaOh--> NaCl + H20

235. chemistry

How many moles of O2 are needed to combine with 0.288 mol Al to give Al2O3?

236. physics

What is the kinetic energy of a 62kg cyclist if she is moving on her bicycle at 8.2 m/s?