# Questions Asked onMarch 9, 2010

2. ## AP Chemistry

In a saturated solution of Zn(OH)2 at 25 degrees Celsius the value of [OH-] is 2.0x10^-6M. What is the value of the solubility-product constant, Ksp, for Zn(OH)2 at 25 degrees Celsius? A. 4x10^-18 B. 8x10^-18 C. 1.6x10^-17 D. 4x10^-12 E. 2x10^-6 Help?

3. ## math

who makes rainwater mix with dirt?

4. ## Calculus - another question

"The side of an equilateral triangle decreases at the rate of 2 cm/s. At what rate is the area decreasing when the area is 100 cm^2?" Help!

5. ## Chemistry

The equilibrium constant for the reaction 2NO(g) + O2(g) 2NO2(g) is Kp=1.48x10^4 at 184C. Calculate Kp for 2NO2(g) 2NO(g) + O2(g). I know the equation is Kp=Kc(RT)x Delta n Kp is what we're solving for Kc= I can't seem to find. R=.0821 T=184+273 Delta n= 1

6. ## chemistry

The molarity of urea in a solution prepared by dissolving 16 g of urea (MW 60.0g/mol) in 39 g of H2O is ______M. The density of the solution is 1.3 g/ml.

7. ## Chemistry--help!

Given the equilibrium: HCN(aq) + H2O(l) ←→ H3O+(aq) + CN-(aq) ΔH >0; Ka = 4.0 x10-10 What happens to the concentration of hydrogen cyanide [HCN] when the following stresses are placed on the system at equilibrium? NaCl is added ---> Stays the Same but

8. ## Chemistry

CO(h20)6 2+ + 4Cl- CoCl4 2- + 6H20 What would AgNO3 do when added to this? What is the equilibrium expression?

9. ## Statistics

A student group claims that first-year students at a university must study 2.5 hours (150 minutes) per night during the school week. A skeptic suspects that they study less than that on the average. A class survey finds that the average study time claimed

10. ## Physics

The instant before a batter hits a .14 KG baseball, the velocity of the ball is 45 meters per second west. The instant after the batter hits the ball, the ball's velocity is 35 meters per second eat. The bat and ball are in contact for 1.0 x 10 ^-2 second.

11. ## Physics

A spring with a force constant of 4.5×104 N/m is initially at its equilibrium length. How much work must you do to stretch the spring 0.070 m? How much work must you do to compress it 0.070 m?

12. ## trig

prove: 1+cosx/1-cosx-1-cosx/1+cosx=4cotxcscx

13. ## Physics

A kayaker paddles with a power output of 50.0 W to maintain a steady speed of 1.30 m/s. Calculate the resistive force exerted by the water on the kayak. If the kayaker doubles her power output, and the resistive force due to the water remains the same, by

The CM of an empty 1170 kg car is 2.50 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 2.8 m from the front of the car, and three people sit in the back seat 3.90 m from the front?

15. ## chemistry 101

Assume you are performing the calibration step of Experiment 8 and you begin with 50 g of water at 20 oC and 50 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment,

16. ## Science

Homw many grams of copper sulfate pentahydrate (CuSo4 5H2O) would you heat to produce 29.8 g of water?

17. ## Calculus

A point moves along the curve y=(x-2)^2 such that the x coordinate is increasing at 2 units per second. At the moment x=1, how fast is its y coordinate changing.

18. ## Physics

A 70 kg bicyclist rides his 7.8 kg bicycle with a speed of 14 m/s. How much work must be done by the brakes to bring the bike and rider to a stop? How far does the bicycle travel if it takes 3.5 s to come to rest?

19. ## chemistry

what mass of sodium acetate, NaCH3CO2, must be added to 1.0 L of 0.10 M acetic acid to give a solution with a pH of 4.50?

20. ## Chemistry

A galvanic cell consists of La^3+/La half-cell and a standard hydrogen electrode. If the La^3+/La half cell functions as the anode and the cell potential is 2.52 V, what is the reduction potential for the La^3+/La half cell? the choices are -2.52V,-0.84V,

use the grid. draw two different figures that each have a perimeter of 14. find each area. question 2. draw a figure with the given perimeter of 10 units and 22 units. question 3. explain why it would be important to know the area of a room that new

22. ## college chem

. Jack Daniels Tennessee whiskey is 40.00% ethanol by volume. However, % alcohol by mass is quite different from % by volume. The molality of ethanol in an aqueous solution that is 40.00 % ethanol by volume is 10.88 molal. A) Find the % ethanol by MASS,

23. ## math

the area of a rectangle is 100 square inches.the perimeter of the rectangle is 40 inches.a second rectangle has the same area but a different perimeter. is the second rectangle a square?

24. ## math

If you have five brownies and you want to share them equally with four people. What is the fraction each person receive?

25. ## Chem

A sample of gas of mass 2.929 g occupies a volume of 426 mL at 0degree Cel and 1.00 atm pressure. What is the molecular weight of the gas? Thanks!

26. ## Chemistry

CO(h20)6 2+ + 4Cl- CoCl4 2- + 6H20 What would AgNO3 do when added to this? What is the equilibrium expression?

27. ## Precalculus

A line segment has endpoints A=(1,3) and B=(13,19). a) Find the equation of the circle for which the segment AB is a diameter. Ans: (x - 7)^2 + (y - 11)^2 = 100 b) Accurate to the nearest tenth, the circumference of this circle is _______ ? I was able to

28. ## Physics

Three equal charges q form an equilateral triangle of side a. Find the potential at the center of the triangle. Express answer in terms of the variables a, q and Coulomb constant k.

29. ## sciencee

1. What pressure would be needed to compress 25.1 mL of hydrogen at 1.01 atm to 25% of its original volume? 2. If the pressure on a 1.04-L sample of gas is doubled at constant temperature, what will be the new volume of the gas? 3. A 1.04-L sample of gas

30. ## Chemistry

A 8.6 X10^-3M Solution of H3PO4 has a Ph=2.30. what is Ka for H3PO4? Have no clue how to solve this problem

31. ## Math

Julio ordered towo pizzas for dinner Friday. Dad ate 3/4 of one pizza, Jenny ate 1/8 of a pizza, Danny ate 1/4 of a pizza, and Mom ate 1/2 of a pizza. What fraction of a pizza was left for a midnight snack?

32. ## Statistics

A die that is fair will have each face of the die come up one-sixth of the time in the long run. The population for die throwing contains the results of throwing the die an infinite number of times. For this problem, the parameter of interest is p is the

33. ## trignometry

prove: sin(a+b)/cosacosb=tana+tanb

34. ## Chemisty

In which cases are higher-energy photons released, with Li+ or Cu2+? How do you know?

35. ## physics

A 0.16-g spider hangs from the middle of the first thread of its future web. The thread makes an angle 7.2* with the horizontal on both sides of the spider. (A) What is the tension in the thread? (B) If the angle made by the thread had been less than 7.2*,

36. ## Science

A new organism is found that is multicellular, does not have a backbone and has six legs. Classfy this organism in two ways.

37. ## Physics

A 1900kg car starts from rest and drives around a flat 56-m-diameter circular track. The forward force provided by the car's drive wheels is a constant 1000N. a. What is the magnitude of the car's acceleration at t=13s? b. What is the direction of the

38. ## Physics

Two point charges, 5.0 µC and -2.0 µC, are placed 5.0 cm apart on the x axis, such that the -2.0 µC charge is at x = 0 and the 5.0 µC charge is at x = 5.0 cm. At what point(s) along the x axis is the electric field zero? I'm not exactly sure how i

39. ## Physics

At an amusement park, a swimmer uses a water slide to enter the main pool. The swimmer slides without friction, and descends through a vertical height of 2.89 m. Find the swimmer's speed at the bottom of the slide if she starts with an initial speed of

40. ## physics

During a particular thunderstorm, the electric potential difference between a cloud and the ground is Vcloud - Vground = 4.3 108 V, with the cloud being at the higher potential. What is the change in an electron's electric potential energy when the

41. ## Physics

You raise a bucket of water from the bottom of a deep well. If your power output is 108 W, and the mass of the bucket and the water in it is 7.00 kg, with what speed can you raise the bucket? Ignore the weight of the rope.

42. ## Calculus

"A rectangle is inscribed in a semicircle of radius 2 cm. Find the largest area of such a rectangle". There is a diagram, but I think the question makes it clear enough what is going on. I'm having problems finding a relationship that I can work with.

How do you find the perimeter of a letter? for ex. the letter U

44. ## poetry

I need help, writing a personification poem about big ben. any ideas?

45. ## Physics

The instant before a batter hits a .14 KG baseball, the velocity of the ball is 45 meters per second west. The instant after the batter hits the ball, the ball's velocity is 35 meters per second eat. The bat and ball are in contact for 1.0 x 10 ^-2 second.

46. ## Math

how do I solve; two parallelograms have the same base length. The height of the first is half the height of the second. What is the ratio of the area of the smaller parallelogram to the area of the larger one?

write equations to show the synthesis pathway for ethyl-3-hydroxybutanoate. An alkane and alcohol of your choice are the starting materials.

48. ## Physics

Initially sliding with a speed of 2.3 m/s, a 2.0 kg block collides with a spring and compresses it 0.41 m before coming to rest. What is the force constant of the spring?

49. ## math

to find of trigonometric ratios of angles 60

50. ## Algebra II

An appliance store manager is ordering chest and upright freezers. one chest freezers costs \$250 and delivers a \$40 profit. One upright freezer costs \$400 and delivers a \$60 profit. Based on previous sales, the manager expects to sell at least 100

51. ## pre-calculus

Graph each complex number. Then express it in rectangular form. 2(cos(4pi/3) + isin(4pi/3)) I don't understand where to go from here.

52. ## Chem

How much heat (in kJ)is required to convert 2.565kg of liquid sulfur dioxide at the boiling point to a gas at 60C? BP of SO2 is -10C and delta H vap is 25.73kJ/mol. Specific heat capacity of the gas is 0.622 J/g*K I don't know what formula to use to

53. ## college chem

N2O4 --->2NO2 a 1 liter flask is charged with .4 mols of N2O4. at equilibrium at 373 k, .0055 mols of N2O4 remain. what is the Kc for this reaction? please explain to me how to get the rate law for this and solving

54. ## Critical thinking

How would Robert Coles respond to this quote? The ultimate purpose in studying ethics is not as it is in other inquiries, the attainment of theoretical knowledge we are not conducting this inquiry in order to know what virtue is, but in order to become

55. ## arts high enviromental science

describe the four properties that scientist use to predict population size

56. ## Calculus

4. Find the dimensions of the largest isosceles triangle having a perimeter of 18 cm. Answer ( all sides 6 cm) i really need help with coming up with the equation of the function before solving its derivative and making it equal zero so far i know 2x+y=18

57. ## Chemistry

BrO3^-(aq)+Sn^2+(aq)+ ____ -->Br^-(aq)+Sn^4+(aq)+ _____ H20(l)and H^+(aq) are involved in the reaction. What are the coefficients of the six species in the balanced equation above? Remember to include coefficients for H2O(l) and H+(aq) in the appropriate

58. ## trig

prove: cscxcos*2x+sinx=cscx

59. ## Chemistry

For the following reaction at 600. K, the equilibrium constant, Kp is 11.5. PCl5(g) PCl3(g) + Cl2(g) Suppose that 3.314 g of PCl5 is placed in an evacuated 460. mL bulb, which is then heated to 600. K. (a) What would be the pressure of PCl5 be if it did

60. ## english

how would i diagram this sentece "What does the total consecration to god mean"

61. ## Precalculus

Find two points, one on the horizontal axis and one on the vertical axis, such that the distance between these two points equals 15. NEED HELP PLEASE!!

62. ## chemistry

2 mol of solid iron (C = 25.1 J/(mol K)) is heated from 20C to 200C. How much does its internal energy change? U = q +W but no matter exchange so work is 0. then U=q=9036J But why is q not negative since isnt the system loses its heat to the surrounding

63. ## chemisty

(NH4)2SO4 How many atoms

64. ## math

What is the probability that exactly three children in a family of five children will be boys? Assume that P(boy)=P(girl)

65. ## Chemistry

Are the molecular and imperical formula of lauryl alcohol the same? C12 H26 O?

66. ## Chemistry

I conducted the synthesis of an Alum experiment in my lab last week and I'm working on my report. I'm almost done expect I don't know how one could increase the yield of the product (alum crystal)? And also what is the point of adding sulfuric acid? Can

67. ## Physics

An ice cube is placed in a microwave oven. Suppose the oven delivers 135 W of power to the ice cube and that it takes 30200 J to melt it. How long does it take for the ice cube to melt?

68. ## Statistics

Two cards are drawn in succession from a standard deck of 52 cards without replacing the first one before the second. a) Are these outcomes are independent? Why? b) Find P ( 3 on 1st card and 10 on the 2nd card) c) Find P( 10 on the 1st card and 3 on 2nd

69. ## College Chemistry

A mixture of He and O2 is placed in a 4.00L flask at 32 degrees Celsius. The partial pressure of the He is 2.7 atm and the partial pressure of the O2 is 1.4 atm. What is the mole fraction of O2?? I don't understand how to do this.

70. ## chemistry

What is the volume occupied by 2.20 mol of argon at STP? Round to the nearest hundredth. Don't forget the units.

71. ## College Physics**

A student goes to planet x and wants to determine the gravity there. The student knows from physics lab that they can use Atwood's machine to determine gravity. The student places a 100g mass and a 110g mass at the end of a string and hangs it over a

72. ## science

which ocean current cools the climate of locations along the northeastern coastline of north america?

73. ## Environmental Science

Please check my answers. 29. In two or three well-developed paragraphs, explain how pollutin can come from both natural sources and from human activities. Provide examples of each. It is true that pollution can come from both natural sources and from human

74. ## math

the officejet printer can copy Janet's dissertation in 10 minutes. The laserjet printer can print the same copy in 20 minutes. If the two machines work together, how long would they take to copy the dissertation?

75. ## Chemistry

Given the equilibrium rxn CF4(g) + 2H2O(l) ⇔ CO2(g) + 4HF(g) ΔH < 0 if pressure is increased by adding argon gas to the equilibrium, I know it doesn't decrease the amount of HF. But if a random gas is added for any equilibrium rxn, will it always cause

76. ## math

an observer is standing 200 meters from a hot air ballon, when is rising vertically at constant rate of 4m/sec. how fast is the angle of elevation changing 30 seconds after launch?

77. ## MATH214

Solve each of the following systems, if possible. Indicate whether the system has a unique solution, infinitely many solutions or no solution. (a) 3y = x – 10 y = x – 2 (b)x + y = 5 3x + 3y = 15

78. ## MATH

Find the surface area of the 4 x 4 x 4 cm Prism shown. You may want to draw a net to help you. Remember to answer in the correct units of measure for area. (10 points) (Points :10) 96cm 48cm2 96cm2 3 2. [8.08] Find the surface area of the cylinder with

79. ## Geography

Evaluate the threats to a sustainable China. I need to write four pages on this! I don't know how to evaluate.

80. ## physics 101

A 72.9 kg man is standing on a frictionless ice surface when he throws a 1.6 kg book at 11 m/s.

81. ## Chem

The boiling point of ethanol is 78.5C and delta H vap = 40.5kJ/mol. Calculate the vapor pressure (in torr) of ethanol at 0.0C ?

82. ## Calculus

The edge of a cube is increasing at a rate of 2 inches per minute. At the instant when the volume is 27 cubic inches, how fast is the volume changing? indicate the units of measure. V=x^3

83. ## Algebra

What similarities and differences are there between functions and linear equations? Are all linear equations functions? Is there an instance when a linear equation is not a function?

84. ## English

1. When is the report due? It is due on Monday. 2. When is the book due? It is due on March 10th. (Are the short dialogues correct?) 3. What are you saying? 4. What are you speaking? 5. What are you talking about? (Are the three commonly used and

85. ## alegra

log x + log (x + 3) = 1

86. ## Math

Julio ordered towo pizzas for dinner Friday. Dad ate 3/4 of one pizza, Jenny ate 1/8 of a pizza, Danny ate 1/4 of a pizza, and Mom ate 1/2 of a pizza. What fraction of a pizza was left for a midnight snack? Mr. L answered to my question like this: 6/8 +

87. ## Math

how do I solve; two parallelograms have the same base length. The height of the first is half the height of the second. What is the ratio of the area of the smaller parallelogram to the area of the larger one?

88. ## ALGEBRA

i NEED MORE THAN JUST THE EXAMPLE i ALSO NEED TO EXPLANATION Take any number (except for 1). Square that number and then subtract one. Divide by one less than your original number. Now subtract your original number. You reached 1 for an answer, didn’t

89. ## English

1. What's your favorite class? 2. It's math. 3. It's math class. 4. It's a math class. 5. My favorite class is math. Which are the right answers for the question? 6. What's your favorite subject? 7. It's math. (What about the question, #6? Is the question

90. ## Math

if line m is parallel to line n and is cut by a transversal and angle 4 =3x - 20 and angle 5 = x + 40, what is the value of x?

91. ## English

Can you check the grammar in the following sentences, please? 1)The narrator is a voice which (or who?) talks about the story (or who tells the events in a story?) 2) An omniscient third-person narrator can be either obtrusive or unobtrusive, depending on

92. ## French

Could you check these please Part 1 Directions: Complete with either e,es,ées, or s. J'ai pris ------- des photos. J'ai envoyé --------- les photos que j'ai pris --------- à mon amie Catherine. Je les ai envoyé --------- la semaine dernière. Je les ai

93. ## physics

A 380 turn solenoid of length 32.0 cm and radius 3.10 cm carries a current of 4.80 A. Find the following. (a) the magnetic field strength inside the coil at its midpoint mT (b) the magnetic flux through a circular cross-sectional area of the solenoid at

94. ## accounting/auditing

(Drug Benefits and Post Retirement Liabilities) Delphi Company reduced its other post reitrement benefits by approx 500 million because of a change in the law. The federal government will not reimburse companies for prescription drug benefits that it

95. ## biology

all life forms currently have a basic cell membrane so we presume that the earliest forms of life had this "fence" isolating the internal organization from the external chaos. It is likely that the primordial environment was acidic. In such a case, the

96. ## Pre-Cal

1) Use the half-angle formulas to determine the exact values of the sine, cosine, and tangent of the angle. 67 degrees 30'

97. ## chemistry

Calculate the mass in atomic mass units of .25 mol of carbon-12 atoms. I don't know how to set it up..

98. ## Science

The bottled water industry has become an enormous, multi-billion dollar a year industry.there are some negative impacts of bottled water idustry on enviroment.many of these bottles are recycled by conscientious consumers, most are not, and are ending up in

99. ## bio

is hydrogenated margarine a trans fat? is butter a saturated fat?

100. ## Chemistry --Help 2! :)

Predict whether Fe(OH)2 will dissolve, precipitate, or do neither after: (a) water is added --> dissolve (b) Fe(OH)2 is added--> neither (c) Solid Fe(NO3)2 is added--> precipitate (d) Solid KNO3 is added---> neither I'm given the answers...but no

101. ## Biology

10. Which of the following is NOT true about the digestive system of annelids? a. It contains setae to move the food through the anus b. It is similar to an open tube c. It passes nutrients through the intestinal wall to the bloodstream d. It stores soil

I have a rectangle equally divided into 24 parts I must cut it into 5 pieces and make a new shape. cannot bea rectangle

103. ## Algebra 2

Solve: e^4x = 120 I did ln4x = ln 120 divided both sides by ln 4 and got 3.4534. Is this correct?

104. ## science

for my intro i got a 'Water is the elixir of life'and i got lota of negative impact are trasportation, production is the reliance on fossil fuels,Raw plastic must be heated before it can be injected into bottle-shaped blow molds, and this heat source is

105. ## MAT 101

Solve for X and Y in the following problems using either substitution or elimination methods. 2X + 5Y = 19 , 3X + 3Y = 15 4X + Y = 22 , 2X + 3Y = 16 12X + Y = 174 , 8X - 2Y = 36

asked by SEMA , Need Help
106. ## math

Eighteen marbles are dropped into a jar. There are 8 black marbles, 7 red ones, and 3 silver ones. Marbles are taken from the jar without looking. Use this information to answer these two questions. 1. If one marble is taken, what is the probability of

107. ## Physics

the ski boat is traveling at 15 m/s and the tension in the rope is 80 N. If the boat does 3500 J of work on the skier in 54.6 m, what is the angle between the tow rope and the center line of the boat?

108. ## Chemistry

A solution containing 7.00grm of lead nitrate is combined with a solution containing 7.00g of sodium sulfate. (a) write a balance equation for the reaction. Pb(no3)2 aq + NaSo4 aq ---> PbSo4 +2 NaNo3. I think that's right. (b)How many moles of the the

109. ## ALGEBRA

Part B. Each auditorium has both floor seats and balcony seats. Auditorium A has 250 floor seats and 310 balcony seats and Auditorium B has 195 floor seats and 410 balcony seats. Let f represent the cost of a floor seat and b represent the cost of a

110. ## math

A bag contains 13 marbles of which 10 are red. A marble is selected at random and replaced. A second marble is then selected at random. What is the probability that both marbles are red?

111. ## Physics

An arrow with a mass of 30g is shot straight up to a height of 130m what is the arrow's initial velocity?

112. ## math

Can somebody PLEASE help me understand how to find the domain of a function. I have an F in algebra 3 and just got a 50% on my math quiz. I'm desperate!

113. ## geometry

which property justifies: if line lm is congruent to line op then line op is congruent to line lm?

114. ## Mathamatics

O is any point on Diagonal DB OF Parallogram ABCD. Prove that Ar (Triangle OAB) = Ar(Triangle OBC

115. ## his 135 HHHEEEEELLLLLLPPPPP!!!!

how did the minority groups struggle for civil rights begin in the 1950s? what event do you think was the most responsible for bringing the public attention to the american cival rights movement? explain why you selected this event? can anyone help history

116. ## math

find the LCM of 11(t-7) and 77(t-7)

117. ## chemistry

Give the cell diagram notation of the electrochemical cell that could be used to determine experimentally the dissociation constant (Kw) of water. The standard reduction potential for: O2 + 2H20 + 4e- ---------> 4 OH- 0.40 V

118. ## math

An inheritance of \$50,000 is divided into two investments earning 8.5% and 10% simple interest. ( The 10% investment has a greater risk.) Your objective is to obtain a total annual interest income of \$4700 form the investments. What is the smallest amount

119. ## Internatinal Relations

Five of the most serious international problems facing the world today are: 1) the proliferation of WMD 2) international terrorism 3) economic development in impoverished countries 4) international financial stability 5) climate change In which of these

120. ## Algebra

Which of the following expressions equals the sum of the binomial factors of 6q^3-5q^2+24q-20? A. 7q^3-1 B. 6q^3-1 c. q^2+6q-1 D. q^2+6q+1

121. ## Precalculus

I have posted this question earlier as well but was unable to receive an answer. I don't know how to do this question at all, so PLEASE help me with this question and also show me the steps, so that I can learn. I would appreciate it a lot. A high sound

122. ## math

The median score on a test is 90. Is it possible to add two more scores to the data and still have a median score of 90?

find each unit price to the nearest cent. 3.60/4 pens

124. ## Chemistry

Does anybody know the principle quantum number of an atom that has s, p, d, f orbitals? I'm pretty sure the number is inbetween 2-4, but I am unsure of how to figure out the principle quantum number just using that information. Thanks in advance!

125. ## Chemistry

If a weak acid is say only 5% ionized at equilibrium, then the ionization rxn would be reactant favored, correct? I am a little on the fence about understanding this if anyone could better explain why this would be? I am assuming because it is not

126. ## psychology

Please submit your end-of-the year report by December 31 so we can include your accomplishments in our report the Corporate Office due January 21.Is it appropriate to give the report due date in this sentence? a) No because the reader will not believe that

127. ## chem

Releasing oxygen gas, A physical change?

128. ## Physic

If a person jumps 8.59m horizontelly and jumps at 23 degrees, what is his initial velocity? Plz and thank you.

129. ## ALGEBRA

Answer the questions below. Use Equation Editor when writing or solving mathematical expressions or equations. First, save this file to your hard drive by selecting SAVE AS from the File menu. Click the white space below each question to maintain proper

130. ## Algebra 2

I'm trying to solve 2e^(3x) + 5 = 2 but it's not working put well. Help please, someone?

Describe the major types of expenditure which are likely to be incurred by a business in maintaining its stocks

132. ## psychology

Would the sentence "Time is Money" be good opening line for a letter urging a group of international business executive to come to an immediate decision about an investment opportunity? a)Yes,because then they would realize that delay could hurt them

133. ## physics

How much energy is produced when the sun converts one kg of hydrogen into helium?

134. ## math

4 people need to cross a brige but it is dark outside and they only have one flashlight and only 2 people can cross at one time. doris takes 10 minutes bob takes 5 minutes jack takes 2 minutes and annie takes 1 minute. how can thay get across in 17

135. ## MATH214

Solve each of the following systems, if possible. Indicate whether the system has a unique solution, infinitely many solutions or no solution. x- 2y=3 4y- 2x=0

136. ## Language arts

ship is to trip as shout is to ??

137. ## psy 210

For each of three developmental domains: physical, cognitive, and social/personality, identify two major changes or challenges associated with that developmental stage (adolescence, young adulthood, middle adulthood, and late adulthood). Stage of

138. ## AR History

Hi. I have to make up a short comic for the 13th amendment. Any ideas?

139. ## Chemistry

I am really stuck on these 2 questions: 1. Why was 2M HNO3 added before adding 0.05M AgN03? 2.Write a full equation b.) an ionic equation between silver nitrate solution and sodium chloride solution.

140. ## English

I need to paraphrase some lines from Beowulf for tomorrow. I really hope you could answer this as well as the previous message I posted to you. Thank you in advance!! 1) The breath of the dragon billowed (how can I rephrase it? “rose and fell”,

141. ## Biology

10. Which of the following is NOT true about the digestive system of annelids? a. It contains setae to move the food through the anus b. It is similar to an open tube c. It passes nutrients through the intestinal wall to the bloodstream d. It stores soil

142. ## Physics

How far from the center of the earth must a person be located in space so t hat his/her weight would be the same as when he/she is standing on the moon?

143. ## Internatinal Relations

Five of the most serious international problems facing the world today are: 1) the proliferation of WMD 2) international terrorism 3) economic development in impoverished countries 4) international financial stability 5) climate change In which of these

144. ## english

the diffrences and similarities between the outsiders novel and movie

145. ## statistics

My question is: The school action society asked its members how many hours they had worked during the previous week in part-time jobs. The following data lists the number of hours spent working during the previous week. 6 6 6 4 6 6 9 8 6 3 7 6 6 7 6 6 7 6

146. ## Space Exploration

Space is our final frontier. Agree or disagree. Then explain I really don't know the answer to this. I don't think it is true, but then again, I'm not sure. Why I don't think it is true is because scientists are still making discoveries; they are still

147. ## Ashworth

supoose you want to heat 440g of water by 20 C how many joules of heat are required.

148. ## science

it is water bottled compony is currentl employing sustainale development first we have to tell breif history about negative impact of industry second we have to explain new sustainable practices of the idustry third we have to tell what is the store in the

149. ## algebra

NEED HELP I AM LOST 2X2-5X-1 1

150. ## English

If the subject of the sentence is first person, then the verb must be in what form?

151. ## Chemistry

What are the balanced equation for the following reactions: HCl and Sodium Hydrogen Carbonate HCl and Copper oxide HCl and Calcium carbonate HCl and Magnesium NaOH and Ammonium Chloride

152. ## chemistry

what do you notice about the atomic number and the number of protons?

153. ## phi 105

What are key differences between the ontological, teleological, and cosmological arguments? Identify the philosopher who you think best supports his or her argument. Explain your answer briefly.

154. ## math214

Joe’s baseball team sold 200 chances to win a \$250 set of golf clubs. What is the expected value of a single chance if only one chance wins?

155. ## math

Express 3.46 as a percent.

156. ## Chemistry

How much KCI dissolves n 100 g of water at 80 degrees C?

158. ## Chemistry

Can you tell me what the systematic name for a compound which has a carbon attached to a phenyl, a double bonded oxygen, and a single bonded oxygen and then a 3 carbon chain is attached to the single bonded oxygen?

159. ## chem

why do S+carvone (caraway oil) and R-carvone (spearamint oil) have the same IR spectra. I know they are enantiomers/mirror images but why the same IR

160. ## algebra

Part B. Each auditorium has both floor seats and balcony seats. Auditorium A has 250 floor seats and 310 balcony seats and Auditorium B has 195 floor seats and 410 balcony seats. Let f represent the cost of a floor seat and b represent the cost of a

161. ## math

find the domain and range of the function. f(x)= square root of x+3

162. ## psych 210 appendix c

Axia College Material Appendix C Match the psychological theories with the appropriate statement(s): __Psychodynamic Theory __Trait Theory __Learning Theory __Sociocultural __Humanistic Theory A. Individualism versus collectivism B. Popular theorist

163. ## maths

A mixture contains two chemicals, A and B, with masses mA and mB. The total mass of the mixture, m, remains constant. B is converted into A at a rate that is inversely proportional to the mass of A and directly proportional to the square of the mass of B

164. ## PreCalculus

I'm unsure how to even start this problem Solve for x: Arctan( -4/5 ) + Arcos (2/SQRT(5) ) = Arctan(x)

Describe briefly the major types of expenditure which are likely to be incurred by a business in maintaining its stocks. Describe those cost, which can be considerable, what reasons might businesses have for maintaining stocks?

166. ## English

As agreed, I'm sending you the sentences I rephrased myself. I'm looking forward to your prompt reply (as I need them for tomorrow). Thank you a lot 1) The breath of the dragon flared up from the rock and the ground boomed (re-echoed?) Beowulf, concealed

167. ## Physics

A person walks 24.0° north of east for 2.80 km. How far would another person walk due north and due east to arrive at the same location?

168. ## Chemistry

Does anyone know what is phenoxyethyolated alchohol?

169. ## help???

i was wondering if this was cheating by having others look and help us with the work?

170. ## Social Studies

What to Name My Crossword Puzzle Title..... Subject"Fashion"

171. ## Math

You are playing a card gam e with a full deck of 52 cards. You win if you draw a red card that is a mltiple of 5. What are your chances of winning on your first draw? For me will be 4/52 . It's that correct?

172. ## trig

prove: tan*2x-sin*2x=sin*2xtan*2x

173. ## math

Do know a word using capital letters.With 5acute angles,2obtuse angles,andnn 5right angles.

174. ## Education

Hi, I just have a question about this assignment I have. It says to complete an internet search to find at least two instances of conflicts between the legal and ethical issues confronting the education of ELLs. "For example, some states have ceased

175. ## math

Write the probability as a decimal,percent and fraction. A) cannot happen B) is certain to happen C) has a "50-50" chance D) will happen about 3 times out of 4 E) has 2 chances in 3 of happening

Prepare a 600 to 700 word analysis of the relationship between humans and time. Include a description of the historical development of the human ability to conceptualize and measure time. Also, examine why humans have a need to measure time, and describe

177. ## Writing / History

Help needed coming up with a specific thesis. Here is the prompt: Explore the role of women in Archaic Greek society as presented in the literature examined in class (The Iliad, Sappho's poems, Archilochus, and a book about Ancient Greece by Thomas

178. ## math214

15) (a) Find 28° 29’ 46” - 16° 48’ 59’’ (b) Express 5.4° in terms of - degrees - minutes - seconds

179. ## Algebra 2

e^x-2 + 4 = 21 I got .8332, is this correct?

180. ## math214

Joe’s baseball team sold 200 chances to win a \$250 set of golf clubs. What is the expected value of a single chance if only one chance wins?

181. ## FRENCH

Could explain the Pronoms Complement D'objet Direct. Thanks for your help.

182. ## Algebra

How do you solve a parabola if it is like this y=x(squared)+-3

183. ## us history

What was the importance of the Industrial Revolution?

184. ## Financial Accounting

Here is the problem: if you could just help me get started in the right direction that would be great, I don't even know where to begin with this question ellar Company was established to manufacture components for the auto industry. The components are

185. ## English

I forgot to include the following statements, too. Thank you very much for your help! 1) A narrator can be external to (?) the story and talk about events he has not taken part in. 2)A third-person narrator refers to the characters using the third person

186. ## Math - # theory

1.8984375 E-20 is on a calculator. What is the 20th digit to the right of the decimal. I need to know how to work it, not the answer.

187. ## Chemistry

How does the process of chromium electroplating work?

188. ## romeo and juliet

for my history project, I need to rewrite one scene from Romeo and Juliet. but it has to be modern. say, Juliet can text Romeo, or talk with him on messenger, and so on. which scene should I choose and any ideas how I can change it?

189. ## Key skills

how could i use my red hat thinking (feelings and emotcians) to explain why i respect and admire someone ?

190. ## Math Help

7-4w=10w what does w=?

191. ## Chemistry

I've been asked to find the IUPAC name for polyvinyl acetate. when i type it in google i keep getting butan-2-yl acetate. but isn't the IUPAC name for acetate ethanoate ..? so would the proper IUPAC name for PVA be butan-2-yl ethanoate?

192. ## cheisty

Water in a wiing pool disolved sodiu chloide othe salts What decribes the water? Homogenous, heterogenous eleent none?

193. ## chem

How any orbits 4p subshell?

194. ## Social Studies

To what degree should European modernization be praised or condemned?

195. ## chemistry

if an acid spilled on a highway, what should be done to clean up the spill?

196. ## trig

find the fundamental solution set (FSS) for(cos2θ)(tanθ+1)=0

197. ## Mathematicas

You are playing a card gam e with a full deck of 52 cards. You win if you draw a red card that is a mltiple of 5. What are your chances of winning on your first draw? For me will be 4/52 . It's that correct?

198. ## government

Please can you help me to answer these questions. 1. Does Britain rule itself today? I wasn't sure how to answer this since it joined the EEC in 2009. 2.Is a country ruled by another called dependent, or a colony? Many thanks for your help.

199. ## math214

Complete the following: (a) 1400 ft2 = _________ yd2 (b) 1/9 yd3 = _________ ft3 (c) 4.5 lb = _________ oz (d) 32 °C = _________ °F

200. ## economics

consumer and producer surplus at equilibriun point explain through graph?

201. ## XECO/212

Locate recent articles in the New York Times or Wall Street Journal in which economists are quoted using positive and normative statements. Provide one quote and its context for both a positive and normative statement. Explain your choice. Evaluate the

202. ## math

find all numbers for which the rational expression is undefined (1/w-6)

203. ## math

Ed, Ethan and Nathan are playing a game. Ed has won11 rounds, Ethan has won 8 rounds, and Nathan has won 1 round. Write the relative frequency of Ed not winning a round as a percent. 45%? Is my Answer correct?

204. ## English

In a long composition, when you write the paragraph that's supposed to "identify the character" what is it supposed to say? their personality or their struggles or the basics of their life in the book?

205. ## math

The median score on a test is 90. Is it possible to add two more scores to the data and still have a median score of 90?

206. ## Chemistry

Why is the light from an incandescent light bulb white?

207. ## math

A physician prescribed tetracycline suspension for a patient who is to take 2 teaspoonfuls four times a day for 4days, then 1 teaspoonful four times a day for 2 days. How many mls of the suspension should be dispensed?

208. ## marketing

List three attitudes of management that can inhibit the establishment of a high standard of customer service and explain each briefly in your own words.

209. ## com 140

CheckPoint:Job Search Management: Creat a table that lays out a day-by-day plan to use as a job aid for your employment search, spanning 3 weeks, Remember that the goal is to obtain an interview and a job offer.

210. ## Chemistry

How does the process of chromium electroplating work?

211. ## msth 117

Take any number (except for 1). Square that number and then subtract one. Divide by one less than your original number. Now subtract your original number. You reached 1 for an answer, didn’t you? How does this number game work?

212. ## English

Thank you writeacher for your corrections! These are the very last sentences for you to check. 1) An epic contains formulas, that is, conventional expressions easy to remember, and kennings, which are metaphorical expressions. Beowulf 2) Beowulf is a young

213. ## trig

prove: cos*2x=csc*2x-2/csc*2x

214. ## Mathamatics

OIS ANY POINT ON DIAGONAL DB OF PARALLOGRAM ABCD PROVE THAT, AR(TRIANGLE OAB) = AR(TRIANGLE OBC)

215. ## Geography

Explain the difference between a butte and a mesa. Thank you

216. ## matn214

) Compute 200/198!=

217. ## gr 12 chem

true or false- correct/explain those that is false Benzene is generally more reactive than alkanes and less reactive than alkenes because of the bonding in its aliphatic ring The polymer produced from polymerization of H2NCH2COOH is......? Write out the

218. ## Algebra 2

I don't know if I did this equation right.. ln 6x (greater than or = to) 4 I got 9.0997

219. ## SCIENCE

what time tutors stay

220. ## English

1. I took a shower so I cleaned the room. 2. I took a shower, so I cleaned the room. 3. I took a shower so that I cleaned the room. (What does #1 mean? Does it mean #2 or #3?) 4. I took a raincoat so I might wear it when it rained. 5. I took a raincoat, so

can you help me with this if you can In reviewing the office's profit and loss statement, the office manager notices a discrepancy between the stated revenue and cash deposits. In fact, it appears the office may have incorrectly booked \$250,000 in revenue

222. ## Marketing

Discuss the relative advantages of price-based versus non-price-based competition. Why should most marketers be leery of using a price-based competitive strategy?

223. ## Geometry

cos x°=15/17 tan 76°=13/x

224. ## french

Part 2 directions: complete with either es, s, ées, 1. Voilà les photos que j'ai --------. (prendre) Answer: prises 2. C;est toi qui les as --------? (prendre) Answer: prises 3. Bien sûr! Je t'assure que je ne les ai pas ---------.(acheter) Answer:

225. ## Physics

What is the equation for work?

226. ## geometry

if AB =5x-3and CD=2x+9 find AB

227. ## com 140

In what ways do audience, purpose, tone, and structure affect the memo and paper’s formatting?

A mixture contains two chemicals, A and B, with masses mA and mB. The total mass of the mixture, m, remains constant. B is converted into A at a rate that is inversely proportional to the mass of A and directly proportional to the square of the mass of B

229. ## biology 123456723456782345678

The science of nutrigenomics helps us to choose the functional foods which best suit your genetic make up What is the link between your understanding of the human genome and the food you eat? thanks

230. ## math

how do I graph this? y = -1/3 |x-2| like, I can do the simple ones (ex: y = -|x+3|), where you put random number for x and get the y value and graph it.. but the fraction confused me.. thanks in advance

231. ## math

Do know a word using capital letters.With 5acute angles,2obtuse angles,and 5right angles.

232. ## MATH

does the series 1/n from n=0 to infinity converge or diverge? what convergence test is this?

233. ## science

can you tell me negative impact of water bottled industry

234. ## science

Which foods contain solids,liquids, and gases?

235. ## science

just help me how to start my intoduction on bottled water idustry

236. ## English

I forgot to include the following statements. I really hope you can correct them, too. 1)"The fleetness of the serpent wound itself together ": the serpent quickly (?) coiled itslef up. 2)Beowulf summoned the strength to swing his sword so hard that it

237. ## Science

Which foods contain solids,liquids, and gases?

How do you turn a mixed into a proper fraction?

240. ## Calculus

If y=ln((3x+2)^6(x+10)^3), then dy/dx=

241. ## Duval

Explain the importance of understanding inventory valuation methods in dertermining the quality of the profit

242. ## English

1. Paul visited me in order to ask for a help. 2. Paul visited me in order to ask for help. (Which one is correct? Are both grammatical? What is the difference between them?)

243. ## Calculus

Determine the convergence or divergence: An=(-1)^n(n/(n+1))

ok 4/25 * 75/100 then switch it to divison 4/25 / 75/100 but you need the recipricle so its 4/25 / 100/75 =?

245. ## Algebra

Please help me find the slope and the y-intercept for the line repesented by the equation y=3x/2. Thank you.

246. ## science

how long does it take to grow different fruits and vegetables? I need a chart! Please!!!

247. ## math214

Classify the following as true or false. If false, tell why. _______ (a) A parallelogram has four acute angles. _______ (b) A line segment contains an infinite number of points. _______ (c) The union of two rays is always a line. _______ (d) Every

248. ## ALGEBRA

Can anyone explain this in 50 words why the equation turns out like it does? -6x-18=-6x+5 0x=23 and can not have zero in the denominator. Division by zero is undefined. 15x+18=15x+18 0x=0 Well, if you take anything times zero the resulting product is zero.

249. ## science

why is fair weather common duing periods oh high pressure?

250. ## tignometry

prove: sin*2x+tan*2x+cos*2x=sec*2x

find the surface area of a rectangular with the measurements of 4 5 and 8

252. ## physic

Explain the term 'artificial radio isotopes'.

253. ## math

cable tension

254. ## english

Need help identify logical mistake, in this paragragh. People are overreacting and taking this so seriously, blowing it completely out of proportion. There was no harm done and I don’t see why they are making it a big deal. I seriously doubt any

256. ## math

a jar has 11 red, 16 violet, 6 green and 25 gray marbles. find p (green)

8.02-3.696

258. ## math

40 is what percent of 800

259. ## scieence

why does the atmophere becomes less dense altitude increases