1. Chemistry

What is the boiling point of each solution? a).50mol glucose in 1000g H2O b)1.50mol NaCl in 1000g H2O

2. Chemistry

An excess of zinc is added to 125 mL of 0.100 M HCl solution, What mass of zinc chloride is formed? Zn + 2HCl ----> ZnCl2 + H2

3. phys101

in a calorimeter can(water equivalent=40g)are 200g of water and 50g of ice,all at 0 degreea celcius.into these poured 30g of water at 90degrees celcuis.what will be the final temperature of the system?specific capacity of water is 4186j/kg per degrees

4. chemistry

Consider the first order reaction A --> products where 25% of A disappears in 24 seconds. What is the half life of this reaction? ...i thought it would just be doubled but it isn't. i'd appreciate an explanation.

5. Chemistry

I have these two questions on my section review that I don't know how to answer. Can someone help me? Please and thank you. 3. Describe in your own words how to prepare 100 mL of a .85 M solution of sodium chloride. 4. If you dissolve 2.00 mol KI in 1.00 L

6. Chemistry

Determine the freezing points of each 0.20m aqueous solution. a)K2SO4 b)CsNO3 c)Al(NO3)3

7. chemistry

What is the freezing point of each solution? a)1.40mol Na2SO4 in 1750 g H2O Are these the right steps? 1.40mol Na2SO4 / 1.75kg = .8m 3 * 1.86 degrees C * .8m = 4.46 degrees C 4.46 degrees C - 1.86 degrees C = 2.6 degrees C

8. Physics

A steel ball has a mass of 4.0 kg and rolls along a smooth, level surface at 62m/s. What is its kinetic energy. At first the ball was at rest on the surface. A force acted on it through a distance of 22 m to give it the speed of 62 m/s. What was the

9. college

Find the minimum initial speed of a projectile in order for it to reach a height of 2039 km above the surface of the earth.

10. Chemistry

Yellow CdS pigment is prepared by reacting ammonium sulfide with cadmium nitrate. What mass of CdS can be prepared by mixing 2.50 L of a 1.25 M Cd(NO3)2 solution with an excess of (NH4)2S? Cd(NO3)2 + (NH4)2S ---> CdS + 2NH4NO3 Could someone give me a step

11. Statistics

A sample of 12 measurements has a mean of 34 and a standard deviation of 4.5. Suppose that the sample is enlarged to 14 measurements, by including two additional measurements having a common value of 34 each. A. Find the mean of the sample of 14

12. Music

What literary devices are in the song "Me Against the World" by Tupac Shakur?

13. chemistry

The gases in a mixture have the following partial pressures at the same volume and temperature: 1,013,000 Pa nitrogen, 700 mm argon, 1.20 atm of helium, 790 torr oxygen, and 0.50 atm of carbon dioxide. Rank these gases in order of increasing mole fraction,

14. math

find all solutions of the equation 4cos^2x-4cosx+1=0

15. physics

The charges of two identical aluminum speheres are -24uC and +4.0uC. The spheres are brought together so they simultaneously touch each other. They then separated and placed on the X-axis. What is the net force exerted b one sphere on another after

16. physics

A bullet having a velocity of 680 m/!@#\$%^&s a target 510 m away. If the temp. of the air was 18 degrees celsius, how long after the bullet was fired did she hear it hit the target?

17. Chem

What percentage of sodium-24 with a half life of 15.0 hr would remain after 60hours?

18. Chemistry 103

How many acetone molecules are present in a bottle of acetone with a volume of 325ml and density of acetone .788g/cm

19. Physics

A 0.409 kg block is attached to a horizontal spring that is at its equilibrium length, and whose force constant is 19.5 N/m. The block rests on a frictionless surface. A 0.0500 kg wad of putty is thrown horizontally at the block, hitting it with an initial

20. algebra

the last week of a month a car dealership sold 12 cars.A new sale promotion came out the first week of the month and sold 19 cars that week what was the percent increase in sale from the last week of the previous month compared to the first week of the

21. Physics

A child sits in a wagon with a pile of 0.60 kg rocks. If she can throw each rock with a speed of 10 m/s relative to the ground, causing the wagon to move, how many rocks must she throw per minute to maintain a constant average speed against a 3.7 N force

22. Chemistry

The vapor pressure of nitrogen at several different temperatures is shown below. Temperature Pressure () 65 130.5 70 289.5 75 570.8 80 1028 85 1718 Use the data to determine the heat of vaporization of nitrogen. Determine the normal boiling point of

23. Chemistry

What volume of 6M HCl and 2M HCl should be mixed to get 2 litres of 3M HCl?

24. Food Chemistry

Calculate the amounts and pH values for preparing the following acetic acid/acetate buffer solution. 1.) In the first step, If you plan to prepare a 2.00 M sodium acetate in 200.0 mL distilled water, how many grams of sodium acetate should be added in

25. Chemistry

If 0.125 L of a 0.100 M solution of Ba(OH02 are mixed with 0.200 L of a 0.0750 M solution of H3PO4, the following reaction takes place. 3Ba(OH)2 + 2H3PO4 ---> Ba3(PO4)2 + 6H2O What mass of barium phosphate is formed? I got 2.51 g Ba3(PO4)2, is that

26. Chemistry

I don't understand how to do this problem. You mix 1.00 L of 2.00 M BaCl2 with 1.00 L of 2.00 M AgNO3. What compounds remain in the solution, and what are their concentrations? BaCl2 + 2AgNO3 ---> 2AgCl + Ba(NO3)2 Is it trying to trick me with the two sets

27. Physics

A child who has a mass of 17 kg slides down a slide from a height of 3.3 m. If friction does a non-conservative work of -143 J, what is the speed (in m/s) of the child at the bottom of the slide? The acceleration due to gravity is 9.81 m/s2

28. Physics

A 61.8 kg skier coasts up a snow-covered hill that makes an angle of 26.0° with the horizontal. The initial speed of the skier is 6.10 m/s. After coasting a distance of 1.86 m up the slope, the speed of the skier is 4.48 m/s. Calculate the work done by

29. college

Find the rms speed of a helium molecule at 321 K

30. Physics

You are holding a shopping basket at the grocery store with two 0.51 kg cartons of cereal at the left end of the basket. The basket is 0.73 m long. Where should you place a (1.8 kg) half gallon of milk, relative to the left end of the basket, so that the

Which pair of numbers, whose sum is 35, have the largest product?

32. college

Find the rms speed of a helium molecule at 321 K

33. Physics

You are working as a summer intern for the Illinois Department of Natural Resources (DNR) and are assigned to some initial work on water resources project. The department will be overseeing the construction of a dam to create a large fresh water lake that

34. Chemistry

What is the freezing point of each solution? a)1.40mol Na2SO4 in 1750 g H2O b)0.060 mol MgSO4 in 100g H2O

35. Calculus

Find the derivative. f(x)=(1+logᴈx)/x f'(x)=[1-ln3-logᴈx (ln3)]/(x²ln3) How do you simplify it further? Thanks.

36. Physics

A 0.400 kg block of wood hangs from the ceiling by a string, and a 0.0700 kg wad of putty is thrown straight upward, striking the bottom of the block with a speed of 6.40 m/s. The wad of putty sticks to the block. How high does the putty-block system rise

37. Biology

What is the target organs for Luteinizing Hormone and the Follicle Stimulating Hormone?

38. Collisions

Suppose a bullet of mass m = 6.96 g is fired into a ballistic pendulum whose bob has a mass of M = 0.677 kg. (a) If the bob rises to a height of 0.141 m, what was the initial speed of the bullet? I got .042 km/s; but its wrong. (b) What was the speed of

39. ohys101(heat)

a person had a skin temperature of 33degrees celcuis and was in a room where the walls were at 20degrees celcuis.if the emissivity is 1 and the body surface is 1.5meter squad,what is the rate of heat loss due to radiation? alpha=0.000000567W/meter squad k

40. chemistry

A balloon is filled to a volume of 5.0 102 mL at a temperature of 28.0°C. The balloon is then cooled at constant pressure to a temperature of 1.00 102 K. What is the final volume of the balloon? the answer i got is v=166.66666667 My question is what is

41. Chemistry

How many mL of 0.75M HCl are needed to neutralize 20.0 grams of NaOH?

42. chem

What is the wavelength of a 1400 kg truck traveling at a rate of 72 km/h?

43. chemistry

An ideal gas is contained in a cylinder with a volume of 5.0 102 mL at a temperature of 30.°C and a pressure of 710. torr. The gas is then compressed to a volume of 27 mL, and the temperature is raised to 800.°C. What is the new pressure of the gas?

44. Chemistry

How many mL of 0.75M HCl are needed to neutralize 20.0 grams of NaOH?

45. Chemistry

The equation of nitrogen produced in a deployed air bag is: 2NaN3 + 42.7KJ--->2Na + 3N2. What amount of heat is needed to prepare 0.325kg of N2?

46. physics

A long horizontal hose of diameter 4.6 cm is connected to a faucet. At the other end, there is a nozzle of diameter 1 cm. Water squirts from the nozzle at velocity 20 m/sec. Assume that the water has no viscosity or other form of energy dissipation. a)

47. Chemistry

In studying the chemistry and qualitative analysis of anions, why wouldn't HCl be a good acid to use to determine the solubility of a silver precipitate in acid solution?

48. chemistry

What volume of SO2 will result from the complete burning of sulfer in 8L of oxygen?

49. chemistry

how much heat dows a 23.0g ice cube absorb as its temp increases from -17.4deg C to 0.0deg C?

50. chemistry

90Sr is one of the harmful radionuclides resulting from nuclear fission explosions. It decays by a first-order process with a half-life of 28 years. How many years would it take for 99.99% of a given sample released in the atmosphere to disintegrate?

51. Horizon

What would the final volume of water be if 80.0 kJ were added to a 100.0 mL sample at 100.0 degrees Celsius?

52. algebra

what is the solution of the following system of equations? y = 0 x = y + 2 a) (0,2) b) (2,0) c) (1,2) d) (2,1) thank you

53. chemistry

An ideal gas is contained in a cylinder with a volume of 5.0 102 mL at a temperature of 30.°C and a pressure of 710. torr. The gas is then compressed to a volume of 27 mL, and the temperature is raised to 800.°C. What is the new pressure of the gas?

54. statistics

At a ski area in Vermont, the daytime high temperature is normally distributed during January, with a mean of 22°F and a standard deviation of 10°F. You are planning to snowboard there this January. What is the probability that you will encounter daytime

55. geometry

BD is a perpendicular bisector of triangle ABC. XZ is a perpendicular bisector of triangle WXY. Triangle ABC is similar to triangle WXY with a scale factor of 1:2. Part I. Find BD, AB, WZ, XZ and WX. Part II. What is the scale factor of the perimeters of

56. science

why when carbon dioxide increases it makes the blood more acidic

58. Chemistry

Identify the molecule that has polar bonds but is non-polar (net dipole moment is 0) a. CHCl3 b. NH3 c. BCl3 d. SCl2 e. H2S

59. CHEMISTRY

can we use the molecular formula to predict the shape of a small molecule? Explain.

60. Physics

During a rescue operation, a 5350 kg helicopter hovers above a fixed point. The helicopter blades send air downward with a speed of 59.0 m/s. What mass of air must pass through the blades every second to produce enough thrust for the helicopter to hover? I

61. Chemistry

A deep-sea diver uses a gas cylinder with a volume of 13.0 L and a content of 50.1 g of O2 and 33.4 g of He. Calculate the partial pressure of each gas and the total pressure if the temperature of the gas is 22°C. I got PO= 5.82, PHe=15.5 and Ptotal=21.4

62. algebra

what is the solution of the following system of equations? 2y - x = 8 y = 2x + 1 a) (1,2) b) (5,2) c) (2,1) d) (2,5) and the answer i picked is c thank you, poo :)

63. math

..... Amy finished 6/12 of the problems on her timed test. Jackson finished 4/6 ... the timed test. Did they finish the same fraction of the problems? Explain. ...

64. Chemistry

I'm stuck...that is i believe I've come to an impossible answer: I need to calculate the equilibrium constant 4Fe(s) + 3O2(g) --> 2Fe2O3(s) First off: Delta G G Fe(s) = 0, G O2(g) = 0, G Fe2O3(s) = -741 (x2) -741 (2) - 0 = -1480 = delta G of reaction at

65. calculas

Suppose the temperature at 12:00 noon is increasing at an (instantaneous) rate of 3 degrees F. per hour. What is the rate of change of the temperature in degrees C. per hour. Hint: The relationship between degrees F. and degrees C. is linear, zero (0)

66. accounting

E11-9 The following stockholders’ equity accounts, arranged alphabetically, are in the ledger of Marvel Corporation at December 31, 2007. Common Stock (\$5 stated value) \$1,500,000 Paid-in Capital in Excess of Par Value—Preferred Stock 45,000 Paid-in

67. algebra

Sara and her sister Emily both collect charms for the their charm bracelets. Together they have 42 charms. Emily has 2 more charms than Sara. To figure out the number of charms each girl has, you must first identify the conditions. What are the conditions

68. chemistry

1. when sodium is combined with water, sodium hydroxide and hydrogen gas are produced. How many moles of sodium do you need to make 4.0 mol of hydrogen gas? 2.when aluminium reacts with sulfuric acid, aluminium sulfate and hydrogen gas are produced. How

69. science

why when carbon dioxide increases it makes the blood more acidic

70. geometry

in right triangle ABC, the altitude CD is drawn to hypotynuse AB. The length of DB is 5 units longer than AD. a) If AD = x, express DB in terms of x. b) If CD = 6, write and equation in terms of x to find AD. c) Find AD. d) Find AC.

71. social studies

I have quite a few fill in the balnk questions regarding Russian history luckily i have social studies in 7th period so i could finish it up during lunch but i would like to have it done since it's a study guide can you help

72. Chemistry

The amount of solar radiation received anually in arizona is about 8.4 x 10^6 KJ/m^2. What mass of carbon must be burned into carbon dioxide to produce the same amount of energu in the following reaction? C + 02 --->CO2 deltaH=-393.5Kj

73. science

in a certain chemical reaction, two reactants undergo change to form two products why cant you determine what type of reaction occurred from this information

an adult has about 5 quarts of blood. when he donates a pint for a sick friend, what fraction of his blood does he give away

75. Com 220

How would I compose a full sentence outline on same sex marrige using this thesis: The controversy around same sex marriage is centered in religious or moral convention.Please help an example would be nice. I really do not know where to start.

76. Intermediate Algebra

Solve 5=6x+9 Used ASCII

77. microbiology

Due to the prospect of interplanetary travel, how would you attempt to isolate and identify a bacterial infection acquired on another planet? This bacteria is unknown to use and does not appear in Bergey's or the manual of clinical microbiology.

78. microbiology

how would you attempt to isolate and identify a bacterial infection acquired on another planet?

79. college

Assume that the life expectancy of U.S. males is normally distributed with a mean of 80 years and a standard deviation of 4 years. What is the probability that a randomly selected male will live more than 85 years?

80. statistics

(a)Comparison of GPA for randomly chosen college juniors and seniors: xbar= 3.05, s1 = .20, n1 = 15, xbar2= 3.25, s2 = .30, n2 = 15, á = .025, left-tailed test. calculate d.f. ____________ Standard error ____________ t-calculated ____________ p-value

81. astronomy

What does supernova produce, helium or carbon?

82. bones

if a muscle cell receives a second stimulus while it is contracting will it respond to the second stimulus.explain

83. math

If your first 3 exams are worth 60% you get a 70, 68, and 60. Your 4th exam is worth 30% and your attendance is worth 10% you have not missed any days. What is your grade in the class, if you make a 90 or 80 on the final?

84. math

Steri-strips cost \$4.95 per box, there are 100 per box. If an orthopedic surgical group uses 200 Steri-strips a month, how much would be saved in a year by making a single purchase for a year's supply rather that 12 monthly purchases. If they use 200

85. Physics

Suppose now that the air carts below are both moving to the right initially. The cart to the left has a mass m1 and an initial speed v0; the cart to the right has an initial speed v0/2. If the center of mass of this system moves to the right with a speed

86. physics

(a) Find the speed of a satellite moving around the earth in a circular orbit that has a radius equal to six times the earth's radius of 6.38 106 m. (b) Find the satellite's orbital period.

87. Independent learning

I have to identify 5 ways in which governments (Canadian, to be exact) prevent the spread of communicable diseases.

88. Physics

The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 13 g nail when it is struck by a 550 g hammer moving with an initial speed of 4.1 m/s. I am completely confused by this

89. confidentiality of health information

Dr. Bob's computerized records have been compromised by a hacker, resulting in damages to patients. Which of the following is most true? A. Dr. Bob may be liable if he didn't have proper firewall or other protections. B. Dr. Bob won't be liable. C. Dr. Bob

90. Organic Chemistry

Assuming you have a mixture of 2-nitrophenol and 4-nitrophenol, which solvent would be most suitable for recrystallization if you want to isolate 4-nitrophenol? Water Diethyl ether Toluene Acetone Ethanol

91. APChemistry

Thank you for your help! I just had a question.. is BaO barium oxide a precipitate? or if I combine MgO with Ba(NO3), will I get BaO and is this a solid?

92. Organic Chemistry

Referring to solvent mixtures, which statements are TRUE ? (Select all correct answers.) The solvents of the solvent mixture should have very similar polarities. The solvents of the solvent mixture should have different polarities. The student has to pay

93. Organic Chemistry

Which of the following statements are correct? (Select all correct answers.) Breaking the bonds between the solute molecules is an endothermic process Breaking the bonds between the solvent molecules is an endothermic process Formation of the

94. Organic Chemistry

What are proper techniques to induce crystallization from a saturated solution? (Select all correct answers.) Allowing the solution to cool down. Scratching the outside of the container with a glass rod. Seeding the solution. Adding a solvent that lowers

From the Standard Potential Table in your general chemistry textbook: Which reaction has been chosen as the 'standard' against which every other reaction is measured? A. 2H+ + 2e–H2 B. Li+ + e–Li C. O2 + 4H+ + 4e–2H2O D. F2 + 2e–2F– E. H2 +

96. Algebra

. In this problem, we will analyze the profit found for sales of a certain product. A demand equation (sometimes called a demand curve) shows how much money people would pay for a product depending on how much of that product is available on the open

97. astronomy

What does supernova produce, helium or carbon?

98. Physics

How do you see your reflection in a plane mirror?

99. accounting

At October 31, Nathan Company made an accrued expense adjusting entry of \$1,400 for salaries.

100. chem

I got part 1: What is the pH of the solution created by combining 1.10 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? pH w/HCl =1.12 w/HC2H3O2(aq)= 3.94 But how do you do part two? What are the pH

101. earth and space science

Materials, such as water, that becomes gaseous easily at room temperature are called volatiles. How does the complete lack of volatiles in lunar rocks support the impact theory of the moon’s formation?

102. Computer Programming

Hoe do I write a program to Create a C++ console application that uses cout to display a box of asterisks?

103. math

Write an equation for the hyperbola. It's center is (0,0). Foci:(-4,0), (4,0) vertices:(-3,0), (3,0)

HOW DO I STUDY BETTER? WHEN THERE ARE TO MANY DISTRACTIONS IN MY HOUSE. BECAUSE MY TEST GRADES ARE BAD AND THEY ARE PULLING DOWN MY AVERAGE GRADE

105. Philosophy

Does Bonnie Steinbock think committing adultery is okay or not okay?

explain why and how a canadian goose migrates?

108. astronomy

true or false: The cosmological redshift is a direct measure of the expansion of the universe, thus independent of direction

109. English

Please correct the sentence below, adding punctuation and changing words as needed. The snow was falling fast and was so pretty to behold but we dreaded having to shovel and salt the walkways.

110. Probabilty

The public transport system is aware that one person in twenty does not buy a ticket for their trip. The manager decides to challenge 200 travelling people as to charger they have a valid ticket or not. (a) calculate the probabilty that everyone had a

111. Organic Chemistry

Compound A is recrystallized from n-propanol. Given are the following solubilities (in 100 mL of solvent): 160 g/100 °C, 100 g/80 °C, 60 g/60 °C, 20 g/20 °C, 15 g/10 °C and 10 g/0 °C. How many milliliters of solvent are needed to dissolve 80.0 g of

112. writing for the web

Question 1 This step in planning a Web project involves learning about HTML text editors, the original tools for creating Web pages. Choose a method for creating HTML pages. Gather your materials. Storyboard your pages. Choose a single-page or a multi-page

113. calculus

find the area of the regions enclosed by the lines and curves. x+y^2=0 and x+3y^2=2 i know the answer is 8/3, but i don't know how to get it.

114. Organic Chemistry

Which statements are FALSE about selecting a solvent for recrystallization? (Select all correct answers.) Any solvent can be used for recrystallization as long as the compound dissolves in it. The compound should exhibit a high solubility in the solvent at

115. math

the last week of the month a car dealership sold 12 cars.A new sale promotion came out the first week of the month and sold 19 cars that week what was the percentage increase in sale from the last week of the previous month compared to the first week of

116. chemistry

What is the oxidation number of Ga in Ga(NO2)3? is it O?

117. Intermediate Algebra

Please help me Used the equation Editor (or 9 MsEquation 3.0, found in "insert" then "object) 5=6x+9 6x=5-9 6x=-4 x=-2/3

118. microbiology

whats the 3 major roles the microbiology laboratory (microbiologist) is involved with in the diagnosis of bacterial infections.

119. algebra

Simplify: 5-3[2(3x-4)+3]

120. Geometery

which describes the compositions of 3 reflections in three distinct line, two of which are paralell?

121. apchemistry

thank you for your help before---also, what can i react with BaO to get some noticable consequence---how can i show that what MgO was involved in the reaction?

You are a manager in a large, global manufacturing and services organization. You're trying to explain to your grandfather how different your job is from his before he retired ten years ago. You both know how society has changed and you want to explain how

OK- my daughter got this question for math homework "Buses leave boston for reno 2X a day, every day. Buses leave reno 2X a day for boston, every day It takes 5 days to travel from boston to reno. if you are traveling to boston how many buses will you meet

124. English

Can you pleas check if the following sentences are correct? Thank you very much for your help. 1) He has been (or is?) guilt-ridden since the death of his friend. 2) He is unable to take (make?) decisions by himself. 3)News of his suicide brought by the

125. Math

4 weeks 3 days 13 hours 21 minutes - 2 weeks 6 days 19 hours 31 minutes _______________________________________ This is a subtraction

126. College Chemistry

Does Vapor Pressure decrease as intermolecular forces increase???

127. statistics

A pollster conducts a survey of a random sample of voters in a community to estimate the proportion who support a measure on public health insurance. Let P be the proportion of the population who support the measure. The pollster takes the sample of 200

128. Chemistry

I'm stuck...that is i believe I've come to an impossible answer: I need to calculate the equilibrium constant 4Fe(s) + 3O2(g) --> 2Fe2O3(s) First off: Delta G G Fe(s) = 0, G O2(g) = 0, G Fe2O3(s) = -741 (x2) -741 (2) - 0 = -1480 = delta G of reaction at

129. Econ

"How does the price and output behavior of a price-searcher compare with that of a price-taker? Be sure to explain your answer fully and illustrate with the appropriate diagrams. What are the implications of this for both allocative efficiency and

130. algebra

(x-5)(x+19)=585

131. Calculus

Differentiate: y=ln(x/(2x+3))^(1/2) y=(1/2)ln(x/(2x+3)) y'=0+(1/2)((2x+3-2x)/(2x+3)²) What's next after the quotient rule?

132. algebra

A boarding kennel can hold 50 more cats than dogs. It can hold 200 dogs and cats. How many cats can it hold? a) 50 b) 125 c) 150 d) 75

133. math

An 8 in. by 10 in. photo is reduced by dividing the length and width by 2. what is the new peritmeter?

134. nutrition

Case Study: Diet for a Patient with Chronic Hunger, Iron Deficiency Anemia, and Lead Poisoning Jonathan, a two-and-a-half-year-old, lives with his mother and brothers at his grandmother's house in Chicago. His mother, Anita, works at a pharmacy to support

135. Algebra

a. Suppose that a market research company finds that at a price of p = \$31, they would sell x = 74 boxes of product each month. If they lower the price to p = \$25, then more people would purchase the product, and they can expect to sell x = 80 boxes in a

136. algebra

what is the solution of the following system of equations? 2y + 3x = 8 y = 1/2x a) (2,3) b) (2,1) c) (1,2) d) (3,2) thanks

137. algebra

what is the solution if the following system of equations? y = 2x + 10 3y = -4x a)(5,1) b)(4,-3) c)(1,5) d)(-3,4)

138. algebra

what is the value for y in the following linear system of equations? x - 3y = 6 x = -6 a) -6 b) -4 c) infinite number if solutions d) 0 thank you :)

139. algebra

what is the value for x in the following linear system of equations? 2x + 3y = 6 y =0 a) 3 b) 0 c) infinite number of solutions d) 0

140. Math

What do these factor out too?? (3w^2+w)(-6w-2) (3y^2+y)(6y+2) (6y^2+2y)(-3y-1)

141. algebra

what is the solution of the following linear system? 5x - 2y = 15 5/3x - y = 5 a)(-2,1) b) none c)(3,0) d) inifinite number if solutions

142. calculus

What is the volume obtained by rotating the graph y=x^2 for 0

143. trig

cosxcscx-2cosx=cscx-2

144. Intermediate Algebra

5=6x=9 Used the equation editor 6x=5-9 6X=-4 X=-2/3

145. Math

Simplify. 1.(-15xy^4)(-1/3xy3) Is the answer for number 1 = -15x^6y^1?Thanks Express the area of each figure as a monomial. 1.A circle with the radius of 5x^3. how would I solve this problem?

what is the anwser?? 4c-5=-14c+67

147. math

Simplify 5-3[2(3x-4)+3]

148. Organic Chemistry

Which purpose does recrystallization serve? (Select all correct answers.) It is used to purify liquids. To separate unreacted solid starting materials from the solid target compound. To remove a solid from a liquid. It is used to purify solids. Improve the

149. chemistry

I used 10mL of unknown NaCl-NaBr mixture titrate with 0.10M silver nitrate solution. 10.15mL of silver nitrate solution is used. the conc. of NaCl-NaBr mixture is 8g/dm3 I need to calculate the % composition of the NaCl-NaBr mixture.

150. Intermediate Algebra

6x=5-9 (used ASCII) 6x=-4 x=-2/3

151. Intermediate Algebra

Used the Equation Edition 5=6x+9 6x=5-9 6x=-4 x=-2/3

152. CHEMISTRY

I used 10mL of unknown NaCl-NaBr mixture titrate with 0.10M silver nitrate solution. 10.15mL of silver nitrate solution is used. the conc. of NaCl-NaBr mixture is 8g/dm3 I need to calculate the % composition of the NaCl-NaBr mixture. I used the following

153. math

two angles of a triangle are 68* and 86*. what is the measurement of the third angle

200-300 word descrption of an business scenario

155. Organic Chemistry

We are doing Aldol condensation, and are asked to find the concentration of the UV-Vis Spectrum. However, I am not sure how to do this. In my lab, it says that methanol and polyethylene cuvette range: 300-700nm are used on the purified product. How would

156. spanish

what does escribir un cheque mean

157. COM 220

Can some one please help me come up with an full sentence outline on same sex marriage (opposing it)

158. social studies

after WWII, what did Americans invest in?

159. science

ingredient is 240ug/ml in a 100ml bottle,use 15ml at a time,how many mls of ingredint in 15ml

160. Math

Simplify. 1.(-5x^2y)(3x^4) Is the answer for this = -15x^6y^1? If not could you explain how to do it? Thanks.

161. Algebra

can you walk me through these 4+x/5 < 8 and x-2/3> 2x + 11 Subtract 4 from both sides. x/5 < 4 Multiply both sides by 5. x < 20 Now you try the second inequality. I tried the second one and did not get -7 which is the answer in the book and 36 is the

162. math

Mr. Adams has a box containing 14 coins. The coins are either quarters, nickels, or dimes. In the box are 4 quarters. There are 4 times as many dimes as nickels. How many dimes are in the box? I just need the equation set up and I can then take it from

163. Maths

how do i find the derivative of y=2sin8(x+pi/4)-12??

164. math

seven more that some number equals twenty one

165. Ap Chemistry

What exactly is this question telling me to do? Write the balanced chemical equation for the dissociation of Cu(OH)2(s) in aqueous solution.

166. math

Write an equation for the hyperbola. It's center is (0,0). Foci:(-4,0), (4,0) vertices:(-3,0), (3,0)

HOW DO I STUDY BETTER? BECAUSE MY TEST GRADES ARE BAD, SO THEY ARE PULLING MY AVERAGE GRADE DOWN.

168. Maths

In january 2009, there were 1600 HNS hospitals, of whitch 113 were Foundation Trust hospitals. What persentage of NHS hospitals are Foundation Trust hospitals? Give your answer to 2 decimal Places.

169. operations management

A company requires 5,000 units of a product in a single year. It costs them \$100 per order for expenses such as transportation and communication. If the product is carried in inventory, the carrying cost equals 1% of the price of the product for every

170. us history

Do you think the changes in the 1920s gave Americans more control over their lives? Explain

171. music

my daughter in 2nd grade need help with her music homework. her rhythms are ta, too, four, and titi. The words are welcome, spring, wonderful, dynamics, technology and saxaphone. thank you

172. Algebra

1. In this problem, we will analyze the profit found for sales of a certain product. A demand equation (sometimes called a demand curve) shows how much money people would pay for a product depending on how much of that product is available on the open

173. visual images and how to use them

Question 12 Which of the following visual arguments contains an ethical appeal? none of the above 1 a bar chart of 2003 housing construction sales per state an advertisement for corn seed that shows a farmer and his family standing next to a tractor with

174. Geometry

-Which describes the compositions of 3 reflections in three distinct lines, two of which are parallel? 1. rotation 2. dilation 3. translation 4. glide reflection

175. hca/210

health Identify and describe three causes for the increasing costs of health care

176. trig

cos(x+B)=cosxcosB-sinxsinB

177. Lifeskills

What are good forensic questions i can ask a detective? name a couple please :)

178. Chemistry

What is the spontaneous disintegration in which two particles and/or electromagnetic radiation are emitted? would it be radioactivity, nuclear energy, fission or fusion? Thank you

179. English

Please correct the sentence below, adding punctuation and changing words as needed. We found the play was quite intriguing though it was difficult to follow and the audience became engaged with the action onstage and with the actors in general.

180. college, math

find the bolume of the solid generated by revolving the region bounded by the graphs of y=sqrt x , y=0, and x=4 about the x axis

181. Intermediate Algebra

6x=5-9 6x=-4 x=-2/3 Used ASCII

182. Accounting

I am going to post the Arcadia work sheet so you will have a better understanding for my question: Arcadia Hospital Income Statement YTD Dec 31, 2005 (Dollars in Millions) Operating Revenues 2005 % of rev Budget Over/(Under) Patient revenues 500 550 less:

183. Algebra 2

Evaluate 6!/3!

184. chemistry

How do you make a 100mL solution of 1.50 M of NaCl.

185. psychology

discuss the psychosocial challenges facing retirees?

186. math

if a woker produces 175 parts per hour, how many can be produced in 7 hour

187. Algebra 2

What other artists use a style similar to M.C. Escher and his patterns?

188. calculus

evaluate the indefinite integral integral sign [8/(x ln(1x))] dx = ?????+c

189. chemistry

How would I determine when isomeric dimethylbenzene yields 1 ,2 or 3 mononitro derivatives when treate with HNO3/H2SO4 Thanks in advance

190. Intermediate Algebra

I need help Used ASCII 6x=5-9 6x=-4 x=-2/3 6x

191. Math

If you drink 1 can of soda each day, about how many milliliters would you drink in one year? (A can of soda is 354mL. Round your answer to the nearest ten thousand mL.)

192. Life orientation

Based on sustainable development, 5 ways in which the human or enviromental problem impacts on the community?

193. microbiology

list the 5 main processes of diagnosis of a bacterial infection.

194. French

Could you check these thanks: Directions: Chose the one that best matches. A. Mais elle a une roue de secours dans le coffre. B. Elle brend des leçons de conduite. C. Elle a besoin d'essence. D. Elle doit freiner. 1. Elle va à une auto-école. Answer: B

195. Math

Why does a poor white

196. Math

Why does a poor white

197. CJS 200

Write a 350-700 word response providing an overview of and describing each court level and its responsibilities. Next: Describe the two main differences you found between the state and federal court systems.

198. math

seven more that some number equals twenty one

how do I differentiate y=2sin8(x+(pi/4))-12?

200. math

What do you do if the bottom number of a fraction is greater than the top number and you are subtracting?

201. Romeo and juliet

At the play's end both families plan to?

202. ALGEBRA 1

still working on this and need additional help two houses are for sale on the same street. the second house has 1000 square feet less than twice the square feet of the first house. together the houses have 4400 square feet. what is the square footage of

203. math

2.3n-8=1.2n+3

204. physics

A box which has a mass of 48 kg is dragged across the floor a distance of 5.9 m. If the coefficient of friction between the box and floor is 0.53, how much non-conservative work is done by friction? The acceleration due to gravity is 9.81 m/s2.

205. Physics

Starting from rest, a ball of mass 4 kg experiences a constant force of 8 N. What is the final kinetic energy (in J) of the ball after it has traveled a distance of 1 m?

206. Physics

Starting from rest, a ball of mass 3 kg experiences a constant force of 21 N for 12 s. What is the final kinetic energy (in J) of the ball after 12 s?

207. chemistry

i nee help in this question any help would be appreciated the question is 1.Given the reaction: A(g) + 2 B(g) ---> C(g) + D(g) ��H = -40 KJ, a. If the activation energy in the forward direction is 80KJ, plot the PE diagram. b. Plot a KE

208. AP Math

What pattern do you see in the set of numbers 2,7,12,20

209. Algebra 1

factoring common monomials. 8x-32y 21x to third power-6x squared-3 15x+30 6a squared+48a-24 How do I do these? I am seriously confused.

210. Calculus

Why is this statement true or false the magnitude of vector a + b is greater than and equal to vector a

212. chemistry

How much water must be added if you want to make 1L of solution that is 6M, into a 3M solution

213. math

two number have a sum equal to 50. their difference is 16. to figure out what the number are, you must first identify the varibles. what are the variables in this problem?

215. Econ

How do i explain the change of evolution of financial markets over the past 2 years? i feel like what i have now is just a simple breakdown of how the crisis happened. any advice?

216. english

Instead of being the solution to larger issues like low self-esteem and depression, cosmetic surgery has become the issue." This is my theis, can I please get some help with supportive information to support my thesis. This paper is for cosmetic surgery.

217. algebra

what is the solution of the following system of equations? y = -2/3x y = 1 a)(1,-2/3) b)(-3/2,1) c)(-2,3) d)(1,-3)

218. Math

I can figure out the rule for this table INPUT 0 3 6 9 12 OUTPUT 600 540 480 420 360

219. word study

ship is to trip as shout is to

220. To PsyDAG

It has to be on Happiness, and I'm trying to think of a good title~metaphor that represents that state of mind. I'm trying to think of really good ones, but I can't really.

221. PHYS101

In a calorimeter can(water is melted above?

222. Chemistry

Regarding previous post: I don't understand what I'm doing. My book says the answer is .50 M Ba(NO3)2 but I'm not getting that.

223. Ela

What You Call A Person That doesn't give you your Salary???

224. algebra

solve the following system equations x + y = 1 x - 1 = 1

225. algebra

solve the following system of equations. 5x + y = -9 -5x + 2y = 0

226. Cultural diversity

news reports of last 2 years of changes in the us of policies with muslims and arabic members

227. math

find the missing coordinate. d=5 (b,4) and (2,-1)

228. Math

X/3+15=3(x-11)