# Questions Asked onSeptember 26, 2012

1. ## Chemistry

What is the net ionic equation of reaction of MgCl2 with NaOH? I got the equation and then balanced it and then omitted the spectator ions and ended up with: Mg(OH)2(aq)--->Mg(OH) (s) I wanted to confirm to see if that was correct, thanks.

1. The area of Greenland is 840,000 square miles. What is this number in scientific notation? (1 point) 840 x 105 84 x 10–5 8.4 x 105 8.4 x 10–5 2. What answer represents this number in scientific notation? 0.00000916 (1 point) 916 x 10–8 9.16 x

3. ## math

Suppose you are managing 16 employees, and you need to form three teams to work on different projects. Assume that all employees will work on a team, and that each employee has the same qualifications/skills so that everyone has the same probability of

4. ## calculus

Find y'' by implicit differentiation. 3x3 + 4y3 = 1

5. ## physics

Two tugboats are towing a ship.Each exerts a force of 6000 N and the angle between two ropes is 60 degrees.What is the resultant force on the ship?

6. ## physics

Anonymous answer rating percentage100% Figure 22-21 shows two square arrays of charged particles. The squares with edges of 2d and d are centered at point P and are misaligned. The particles are separated by either d or d/2 along the perimeters of the

7. ## physics

A shuffleboard disk is accelerated to a speed of 5.6 m/s and released. If the coefficient of kinetic friction between the disk and the concrete court is 0.29, how far does the disk go before it comes to a stop? The courts are 15.7 m long.

8. ## Physics

The person in the drawing is standing on crutches. Assume that the force exerted on each crutch by the ground is directed along the crutch, as the force vectors in the drawing indicate. If the coefficient of static friction between a crutch and the ground

9. ## chemistry

When californium-249 is bombarded by oxygen-18, a new isotope and four neutrons are produced. Express your answer as a nuclear equation.

10. ## Microeconomics

8. Assume that the United States is an importer of televisions and there are no trade restrictions. U.S. consumers buy 1 million televisions per year, of which 400,000 are produced domestically and 600,000 are imported. (Worth 2 points) a. Suppose that a

11. ## Chemistry

What is the pH of a 0.50 M solution of NaNO2 if the Ka of H20x = 4.5 x 10^-4. I know that you use the Ka to find Kb and solve from there, but why?

5. Taylor completed the problem below. Describe and correct the error in the problem. 2–4 = –2 • –2 • –2 •–2 =16 (1 point) 1. Taylor changed the negative exponent to a negative base. 2. (0 pts) Taylor did not multiply correctly. The answer

13. ## math

WHAT IS THE ANSWER TO THIS PROBLEM? (WRITE TWO DIFFERENT NUMBERS WHEN ROUNDED TO THE NEAREST TENTH EQUALS 18.3

14. ## chemistry

Radon-222 undergoes alpha decay.what is the nuclear equation

15. ## Chemistry

Convert 3.01 x 10^23 atoms of silicon to moles of silicon. on my paper i have the equations moles S = 3.01 x 10^23 atoms x 1 mole/6.022x10^23 atoms but i'm not sure how to do this. help?

16. ## chemistry

The half-life for the radioactive decay of calcium-47 is 4.5 days.If a sample has an activity of 4.00uCi after 13.5 days, what was the initial activity of the sample?

17. ## Physics

A gray kangaroo can bound across level ground with each jump carrying it 8.4 from the takeoff point. Typically the kangaroo leaves the ground at a 23 angle. What is its takeoff speed? What is its maximum height above the ground?

18. ## Physics

An airplane is flying in a horizontal circle at a speed of 514.8 km/h. The plane is banked for this turn, its wings tilted at an angle of 41.6° from the horizontal. Assume that a lift force acting perpendicular to the wings acts on the aircraft as it

19. ## math

If a permutation is chosen at random, what is the probability that it begins with at least 2 A's?

20. ## 7th grade socal studies

1. According to Confucius, a society will be healthy if people (1 point) choose a ruler who inspires fear. obey their rulers without question. treat each other with respect. give each other money. 2. Two key products China traded with other countries were

21. ## algebra

making linear equation from word problem At low altitudes, the altitude of a parachute and time in the air are linearly related. A jump at 2,880 ft use the US army T-10 parachute system last 120 sec. (A) find a linear model relating altitude a (in feet)

A cube has a volume of 1280 cubic feet. Determine the edge length of the cube as a radical in simplest form.

23. ## physics

A beam of protons is moving toward a target in a particle accelerator. This im trying to study for my exam by doing problems, however im stuck with this one. any help is appreciated beam constitutes a current whose value is 0.39A. (a) How many protons

24. ## Math

A factory has 3 machines that produce the same item. Machines 1 and 2 each produce 30% of the total output, while machines 3 produce 40%. It is known that 6% of Machine 1's output is defective, while machine 2 produces 5% defective items and machine 3

25. ## Chemistry

What is the temperature change in celsius when 29.5L of water absorbs 2.3 kwh of heat?

26. ## Physics

A block of mass 3.00 kg is pushed up against a wall by a force P that makes an angle of  = 30.0° angle with the horizontal as shown below. The coefficient of static friction between the block and the wall is 0.25. (a) Determine the possible values for

If you think that your bill is wrong, you should first: A. contact the local credit bureau and inform it of the billing error. B. complain to the Better Business Bureau. C. contact your state consumer protection agency. D. notify the creditor in writing

28. ## chemistry

Technetium-99m is an ideal radioisotope for scanning organs because it has a half-life of 6.0 {\rm hr} and is a pure gamma emitter. Suppose that 280{\rm mg} were prepared in the technetium generator this morning. How many milligrams would remain after the

29. ## chemistry

KCl(s) → K+(aq) + Cl‾ (aq) Solid KCl dissolves as shown in the above equation. A 6.60 g sample of KCl was dissolved in 42.3 g of water. The initial temperature of the water was 21.90°C. After the compound dissolved, the temperature of the water was

30. ## Chemistry

A student dried a wet crucible with a kimwipe. A piece of kimwipe was left clinging to the inside wall of the crucible. The student did not see the piece of kimwipe when adding the NaHCO3-KCl mixture to the crucible. The crucible and its contents were

31. ## physics

a baseball is thrown at an angle of 24 degrees relative to the ground at a speed of 23.4m/s. the ball is caught 41.4798m from the thrower. how long is it in the air?

32. ## physics

A pendulum bob of mass -m is suspended at rest a constant horizontal force f= mg starts acting on it . Find thecmaximum deflection of the string and the maximum tension in the string

33. ## physics

A woman with a mass of 41 kg runs at a speed of 7 m/s and jumps onto a giant 30 kg skateboard initially at rest. What is the combined speed of the woman and the skateboard?

34. ## physics

4) How many forces act on an upwardly tossed coin when it gets to the top of its path

35. ## College Physics

Vector subtraction (F1 - F2) is a special case of vector addition, since F1- F2 = F1 + (-F2). Use the data (magnitude and direction) of F1 and F2 obtained in measurement 1 to find out the magnitude and direction of the resultant vector of F1 - F2. The data

36. ## Calculus 2

integral of xarctanxdx using integration by parts.

37. ## organic chemistry

Why is steam distillation rather than a simple distillation used to isolate eugenol? My answer is because the temperature goes nowhere near their boiling points, which minimises the risk of decompostion. Is it that right? If not then don't you mind if you

in the last three years, Fred's basketball team won 30 more games than they lost. if they won 150 games, what was their ratio of wins to losses? What are three different ways to show the ratio? what is the unit rate if Ramon drives his car 180 miles in 3

39. ## chemistry

Prepare 1.5 liters of 0.25 M Tris buffer, pH 7.5. Useful information: pKa Tris = 8.1 Formula weight of Tris (hydroxymethyl aminomethane) base = 121.1 Formula weight of Tris hydrochloride (acid form) = 158.0

40. ## AP Chem

Complete and balance the following equations and identify oxidizing and reducing agents. S+HNO3---->H2SO3+N2O

41. ## physics

A sack of flour has weight of 19.8N. what is its weight in pounds?

42. ## Chemistry

What volume of 0.200M of aqueous solution of formic acid, a weak monoprotic acid (KA = 1.78x10-4) and 0.200M aqueous solution of NaOH would you mix to prepare a 500mL of a buffer solution of pH = 4.0.

43. ## science

use the following terms to create a concept map: ecology,ecosystem,producer,decomposers, carrying capacity,consumers, and food web

44. ## physics

Fairgoers ride a Ferris wheel with a radius of 5.50 m, the bottom of which is 1.75 m above the ground. The wheel completes one revolution every 32.0 s. If a rider accidentally drops a stuffed animal at the top of the wheel, where does it land relative to

45. ## chemistry

Use demensional analysis to convert 4.68 grams of boron to cubic centimeters of boron. The density of boron is 2.34 grams per centimeters cubed

46. ## math

The sum of two decimal numbers is 5.3. Their differences is 1.7, and their product is 6.3. what are the two numbers?

47. ## geometry

PM is the median of trapezoid KLNO. If ON = 24 centimeters and KL = 12 centimeters, which is the length of PM

48. ## Physics

A woman driving at a speed of 23 m/s sees a deer on the road ahead and applies the brakes when she is 210 m from the deer. If the deer does not move and the car stops right before it hits the deer, what is the acceleration provided by the car's brakes?

49. ## Science

(1)A geologist was studying rocks in a mountain range. She found a layer of sedimentary rock that had formed in the ocean. Hypothesize how this could happen. My (Answer) Sedimentary rocks forms when sediments have been pressed or cemented together , or

50. ## Chem

Carbon disulfide (CS2) reacts with excess chlorine (Cl2) to produce carbon tetrachloride (CCl4) and disulfur dichloride (S2Cl2). If 67.1 g of CS2 yields 45.2 g of CCl4, what is the percent yield? (Hint, you must first write the balanced equation.) 67.36 I

51. ## Physics

As a civil engineering intern during one of your summers in college, you are asked to design a curved section of roadway that meets the following conditions: When ice is on the road, and the coefficient of static friction between the road and rubber is

52. ## Physics

A Ping-Pong ball has a mass of 2.3 g and a terminal speed of 8.2 m/s. The drag force is of the form bv2 What is the value of b?

53. ## writing algebriac expression

The total amount of money (in cents) in y quarters, 7y dimes, and (2y - 1) nickles.

54. ## Physics

A 84.0-kg airplane pilot pulls out of a dive by following, at a constant speed of 163 km/h, the arc of a circle whose radius is 312.0 m.

55. ## physics

a race car can be slowed with a constant acceleration of -11m/s2. a.if the car is going 55m/s,how many meters will it travel beofre it stops? b.how many metes will it take to stop a car going twice as fast?

1. This element of art is used to create depth in a picture. (1 point) shape pattern space texture 2. This technique is used to angle the lines of roads and buildings in a picture. (1 point) aeriel perspective vanishing point linear perspective atmospheric

57. ## Physics

A crate of mass 50.0 kg rests on a flat surface, and there is a coefficient of static friction of 0.200 between the crate and the surface. A person pushed on the crate with a force of 5.00 N at an angle of 25.0 degrees below the horizontal. Will the crate

58. ## music

Explain what Rhythm, Structure, Melody, Harmony, and Timbre is.

59. ## Physics

The velocity of the transverse waves produced by an earthquake is 7 km/s, while that of the longitudinal waves is 11.41 km/s. A seismo- graph records the arrival of the transverse waves 51.1 s after that of the longitudinal waves. How far away was the

60. ## CALCULUS HELP

Find the second derivative for the function 5x^3+60x^2-36x-41 and solve the equation F(X)=0 i got to the second derivative but what do we do next to be able to get one of these answers.. F(x) = 5x3+60x2−36x−41 1. derivative of F(x) with respect to x =

61. ## physics

astronaut weighs 175Ib. what is his weight in newton?

62. ## maths

A certain nine digit number has only ones in ones period,only two’s in the thousand period and only threes in millions period .Write this number in words in the Indian system

63. ## Math

Wesley estimated 5.82-4.21 to be about 2. Is this an overestimate or an underestimate? Explain

Which shape does not have two pairs of parallel sides? A. rectangle B. square C. parallelogram D. trapezoid

65. ## english

Identify the appositive or complete appositive phrase. Sam, our cat, is too lazy to catch mice.

66. ## physics

a cat chases a mouse across a 1.6m high table. the mouse steps out of the way and the cat slides off the table and strikes the floor 2.0m from the edge of the table. what was the cat's speed when it slid off the table?

67. ## science

a solution made from 35 mL of ethanol and 65 mL of water produces by what percent concentration of volume

68. ## social studies

what is the definition of canopy road

69. ## science

1. Force exerted on an area is called _____. (1 point) pressure temperature gravity mass 2. The composition of the atmosphere is changing due to _____. (1 point) smog ozone depletion increase in CO2 (carbon dioxide) all of the above 3. The _____ is the

70. ## Precalc/Trig

wave is modeled by the function ... h(t) = 3cos(p/10)*t What is the period of the wave (T) *frequency (F) is defined as the number of cycles of the motion per second. What is the relationship between F and T? Find the wave height (H) which is the vertical

71. ## Algebra

3 identical pens for dogs are to be enclosed with 120 fet of fence. if the length of each pen is twice its width plus 2 feet, find the dimensions of each

72. ## phy101

Calculate the velocity needed for an object starting at the Earth's surface to just barely reach a satellite in a geosynchronous orbit. Ignore air drag and assume the object has a speed of zero when it reaches the satellite. (The orbital radius of a

73. ## Physics

A 150-g block is projected up a ramp with an initial speed of 5.6 m/s. The coefficient of kinetic friction between the ramp and the block is 0.23.

74. ## algebra

Your salary after a 3% salary increase if your salary before the increase was S, what is the algebric expression?

Debt-to-equity ratio is: A. calculated by dividing total liabilities by net worth. B. calculated by dividing monthly debt payments by net monthly income. C. determined by dividing your assets by liabilities. D. rarely used by creditors in determining

76. ## chemistry

which temperature is colder: 50F or 50C???

77. ## homework help

which temperature is colder? a) 50F b) 50C

78. ## Physics

A car is towing a boat on a trailer. The driver starts from rest and accelerates to a velocity of +14 m/s in a time of 25 s. The combined mass of the boat and trailer is 401 kg. The frictional force acting on the trailer can be ignored. What is the tension

79. ## social studies

Why did Spain attack, England in the late 1500's? {2 reasons} How did Spain's defeat lead to the weakening of the Spanish Empire?

80. ## math

Sarah is making poster by hand to advertise her school play, but her posters are not the same length as a standand sheet of paper (the width is the same, though). She has three and a half sheets of paper left over, which she says is enough to make two and

81. ## statistics

Thomas needs a b in his class. his current test scores are 88, 83, 86 and 72. his final exam is worth 3 test scores. In order to ear a b Thomas average must lie between 80 and 89 inclusive. what range of scores can Thomas receive on the final to earn a b

82. ## algebra

The NCAA Division I Basketball Tournament begins each year with 64 teams. After each round, a team is eliminated, reducing the number of teams by half. Write an equation to model this scenario.

If creditors give you no credit for payments made during the billing period, this is called the: A. APR method. B. discount method. C. previous balance method. D. adjusted balance method. My choice is A, but Im a little confused.

84. ## 7th grade Science help

1. _______ is energy that flows from an object with a higher temperature to an object with a lower temperature. (1 point) Heat Radiation Potential Chemical 2. The transfer of energy that occurs when molecules bump into one another is called _____. (1

85. ## English

In the story "By the waters of Babylon" what are 9 archetypes in the story. Give examples from the story

86. ## physics

A 6.0-kg object undergoes an acceleration of 2.6 m/s2. (a) What is the magnitude of the resultant force acting on it? N (b) If this same force is applied to a 12.0-kg object, what acceleration is produced? m/s2

87. ## child psychology

early childhood practitioners now know that in addition to cognitive factors there are social factors that impact school readiness. Describe at least two social factors that impact school readiness.

88. ## chemistry

Iodine-131, a beta emitter, has a half-life of 8 days.How many grams of a 10.0g sample of iodine-131 would remain after 56.0 days?

89. ## Physics

A battery has an internal resistance of 0.42. A number of identical light bulbs, each with a resistance of 31.500, are connected in parallel across the battery terminals. The terminal voltage of the battery is observed to be one-half the emf of the

90. ## physics

a pelican flying a horizontal path drops a fish from a height of 5.0m. the fish travels 8.1m horizontaly before it hits the water below. what was the pelicans initial speed?

91. ## Physics

In the figure below, m1 = 3.8 kg, m2 = 5.2 kg, and the coefficient of kinetic friction between the inclined plane and the 3.8-kg block is μk = 0.3. Find the magnitude of the acceleration of the masses and the tension in the cord.

92. ## Science

True or false: light travels in straight lines if the medium it travels doesn't change

93. ## physics

A 36 kg child steps on a scale in an elevator that starts at rest. The elevator then accelerates downward at 0.6 meters per second squared for 1.9 seconds. What is the reading on the scale (in kg)?

94. ## Social studies

How were the ideas of Louis XIV and Philip II similar? How were they different?

95. ## math

Suppose that a department contains 11 men and 19 women. How many ways are there to form a committee with 6 members if it must have strictly more women than men?

96. ## Language Arts

1. Identify whether the capitalized word in the sentence below is used as a participle or verb. I really need to get a WORKING charger for my phone. 2. What is the participle in the participial phrase capitalized in the sentence below? REFUSING TO SETTLE

97. ## Chemistry

How would I calculate the mass of 20ml of a 3% hydrogen peroxide from a 30% H2O2 solution?

98. ## chemistry

Technetium-99m is an ideal radioisotope for scanning organs because it has a half-life of 6.0 {\rm hr} and is a pure gamma emitter. Suppose that 280{\rm mg} were prepared in the technetium generator this morning. How many milligrams would remain after the

99. ## math ALG 2!

-|8X-3Y|+|2Y+5X|.....SOLVE

100. ## Chemistry

how would you prepare 500 ml of .2M solution starting with solid NaH2PO4*H20?

101. ## math30

Determine the sum of the following geometric series. Round your answers to 4 decimals if necessary. a) 50 over sigma k=1 8(.5)^k-2

102. ## Calculus

A hot air balloon headed due east at a speed of 20 miles per hour and at a constant altitude of 180 feet passes directly over an intersection. Find an expression for the balloon's distance d (measured in feet) from the intersection t minutes later.

103. ## Calculus

The drag on an airplane traveling at velocity v is D=av^2+(b/v^2) where a and b are positive constants. At what speed does the airplane experience the least drag. I have so far that D'=-2b/v^3 do i set this equal to zero then i get 0=-2 don't think that is

104. ## Physics

A rod extending between x = 0 and x = 17.0 cm has uniform cross-sectional area A = 7.60 cm 2 . It is made from a continuously changing alloy of metals so that along its length its density changes steadily from 2.00 g/cm 3 to 18.7 g/cm 3 .(a) Identify the

An account at a commercial bank designed for people who want to earn a higher savings rate is a(n) __________ account. A. regular savings account B. regular checking C. share draft D. money market account My answer is D. Am I right?

106. ## World Geo

which of the following natural hazards is not common to new zealand ability to produce goods in sufficient numbers to reduce the unit cost the first people to settle in new zealand wheat is australias most important export australia became a commonwealth

107. ## critical thinking

2. If the library has The Lord of the Rings, you won’t find it on the first floor. This is because all fantasy novels are fiction and all works of fiction are housed on the second floor of the library. Of course, I am assuming that all the books are

108. ## algebra

making linear equation from word problem An airspeed indicator on aircraft is affected by changes in atmospheric pressure at different altitudes. A pilot can estimate the true airspeed by observing the indicated airspeed and adding it about 2% for every

109. ## science

fill in the blank:the ____, the force acting on an object, the greater the acceleration of the object. It is 6 letters and the third letter is R

110. ## math Algerba 1

A maple syrup producer would like to increase production by 500 gallons per year with a goal of producing at least 20,000 gallons of syrup over the first period of production. If the fist years's production, in gallons is given by x, write expressions for

111. ## Physics

An automobile and train move together along parallel paths at 21.8 m/s. The automobile then undergoes a uniform acceleration of −4 m/s 2 because of a red light and comes to rest. It remains at rest for 19.1 s, then accelerates back to a speed of 21.8 m/s

112. ## Algebra

how do you solve xp-yp=z

113. ## Science

Which of these statements concerning the interaction of light waves with the glass of a greenhouse is correct? A. Infrared is transmitted through the glass and is changed to heat B. The glass reflects ultraviolet waves C. Visible light is transmitted

114. ## science

a solution that is composed of 5g of salt for every 95g of water produces by what percent concentration of mass?

115. ## math

Divide 332 by 2 (base 4)

116. ## Stats

A class of 85 students writing an exam had a mean mark of 74.2 write down the total sum of the 85 grades.

117. ## Math

What is the independent and dependent variable in the situation. And what is the rate of change for the situation? Hannah delivered 12 newspapers after 20 minutes and 36 papers after 60 minutes

118. ## Pre-Calculus

Graphing Polynomials Decide whether each of the following is sometimes true, always true, or never true and explain reasoning. A. A cubic function has 2 different x-intercepts ^Never true, has to have 3? B. A cubic function has 3 x-intercepts ^ Always true

119. ## English 11

The motorist, confused by conflicting directions, lost his way. Verbal phrase: Gerund Being used as: Adverb?

120. ## Physics

Given the displacement vectors A = (7.00 - 1.00 + 3.00 ) m and B = (6.00 + 5.00 - 3.00 ) m, find the magnitudes of the following vectors and express each in terms of its rectangular components. (a) C = A - B (b) D = 3A + B

121. ## Chemistry

Lab: Titration of NaOH (0.1 molar)to unknown solid acid. Trying to determine the equilivent weight of the unknown acid in the experiement. I am trying to figure out if I add too much base solution by accident to an unknown acid during titration would it

122. ## Social studies

How were the ideas of Louis XIV similar? How were they different?

123. ## AP Chemistry

A 34.05 gram liquid sample of an unstable compound is deposited in a metal piston assembly that has a cylinder with a diameter of 20.0 cm. After the sample is added, the piston is placed in contact with the liquid and the piston vent is closed. This

124. ## us history

Evaluate the extent to which the Articles of Confederation were effetive in solving the problems that confronted the new nation. Does anywone know where I can find the answer to this? I have to type a whole page on it so I need a lot of information...

125. ## Ella Minnow Pea

I read the book Ella Minnow Pea for school... And I actually enjoyed it! But I have to answer some questions about it and I'm not quite sure what I am suppose to be answering. Do you understand these questions better than me? Here they are! Identify the

126. ## HUMAN RELATIONS, PART 1

The main reason self-confidence is important in human relations is because

127. ## Math

How many combinations of hamburgers can you have with 12 toppings?

128. ## math

Tami wrote the even numbers between 325 and 337.the sum of the hundreds digit and tens digit equals the ones digit.what is Tami number?

129. ## Math

Let f(x) = 2x-1 and g(x) = 4-x. Find all values of x for which f(x) < -1 or g(x)

130. ## general chemistry 2

How many grams of urea [CO(NH2)2] would be required to prepare 200 mL of a 5.0 x 10-3 molar solution? Answer

131. ## Math

Which one of these five words does not belong and why: Acupuncture Puppet Corpuscle Juniper Repulsion

132. ## Physics

Given a wooden sign that is held up by two ropes. One rope at a 37.0 degrees to the horizontal has a tension of 2.00N and the other at an angle of 153.5 degrees to the horizontal feels a tension of 1.785N. How much does the sign weight?

133. ## Physical science

What happens to a ballon as it rises up into the atmosphere? A) increases in volume B) decreases in volume C) the outside atmosphere really makes no differences to the balloons volume

134. ## AP US History

How did the compromises made when writing and ratifying the Constitution encourage the development of political factions? Compare and Contrast the effectiveness of Washington?s and Adams' presidencies in obeying and promoting the Constitution during their

135. ## Math

The perimeter of a square is f feet. How long in yards is each side of the square?

136. ## physics

A football punter accelerates a football from rest to a speed of 9 m/s during the time in which his toe is in contact with the ball (about 0.22 s). If the football has a mass of 0.50 kg, what average force does the punter exert on the ball?

137. ## Chemistry

What volume of 0.200M of aqueous solution of formic acid, a weak monoprotic acid (KA = 1.78x10-4) and 0.200M aqueous solution of NaOH would you mix to prepare a 500mL of a buffer solution of pH = 4.0. I know I need to use the H-H equation, I'm just not

138. ## Math

It is less than 60 and greater than 55 if you add the digits the sum is 13 what is the number

139. ## Chemistry

A student reacted 5.33 grams of cobalt with oxygen gas and obtained 7.50 grams of cobalt oxide. Determine the empirical formula of this cobalt-oxygen compound based upon this experiment.

164. ## Chemistry

I Posted this question the other day: A 1.00 g sample of enriched water, a mixture of H2O and D2O, reacted completely with Cl2 to give a mixture of HCl and DCl. The HCl and DCl were then dissolved in pure H2O to make a 1.00 L solution. A 25.00 mL sample of

165. ## statistics

Calculate the variance version of standard error for each sample in Exercise 10.18—for the liberals (2, 1, 3, 2) and then for the conservatives (4, 3, 3, 5, 2, 4).

166. ## AP US History help?

I know this is really long... but I can't figure it out for the life of me. If you don't want to answer the whole question that is fine. I'm greatful for whatever I can get. Also links to websites with the information is also helpful. Thanks!! Directions:

Sorry I am completly lost on this one and it is my last homework problem. Due in a couple of hours if someone could help. I would greatly appreciate it. A block is placed on an inclined plane. The acceleration of gravity is 9.8 m/s^2. What force is

168. ## Physics

Sorry I am completly lost on this one and it is my last homework problem. Due in a couple of hours if someone could help. I would greatly appreciate it. A block is placed on an inclined plane. The acceleration of gravity is 9.8 m/s^2. What force is

169. ## math ALG 2!

7F-9>3F-1 SOLVE

170. ## math

how many squares with sides that are 6 inches long and needed to cover a aquare with a side length of 30 inches without over lappigng i put 1 am i correct?

171. ## Statistic

Final averages are typically approximately normally distributed with a mean of 78 and a standard deviation of 11. Your professor says that the top 6% of the class will receive an A; the next 24%, a B; the next 41%, a C; the next 18%, a D; and the bottom

172. ## geometry

i have to proof that segment ad is congruent to segment ce. my givens are that segment ab is congruent to cb, that fd bisects ab and that fe bisects cb. the shape is a triangle

173. ## Algorithms

Help Please: I need some help and guidance to solving this problem Week 4 CheckPoint – Repetition and Decision Control Structures In one of the week 3 discussion questions we discussed the algorithm that would be required to make a peanut butter

174. ## Pre-Calculus

Operations with Functions write the function below as either a sum/difference/product/quotient of 2 r more functions a. h(x) = x^2+3x+9 How Would I do this? My teacher just did this f(x) = x^2 g(x) 3x+9 ^I don't really understand h(x)=(x+5)(x-3) how would

175. ## vocabulary

what does vain mean in simple words please?

in a pet store, 1/6 of the puppies are black and 1/4 are white. what fraction of the puppies are black or white?

177. ## English

"The cat is on the roof." Is it SVC or SVA?(sentence pattern).why "we painted the wall green." what is the sentence pattern used here. why?

178. ## physics

A robot probe drops a camera oﬀ the rim of a 437 m high cliﬀ on Mars, where the free-fall acceleration is 3.7 m/s 2 . Find the velocity with which it hits the ground. Answer in units of m/s

179. ## Calculus

The efficiency E of a screw is given by E=T(1-0.35T)/T+0.35 where T is the tangent of the pitch angle of the screw and 0.35 is the coefficient of friction . For what value of T>0 is the efficiency the greatest?

180. ## Calculus

By Kirchoffs voltage law the sum of the voltage in the circuit. Consider the circuit with variable resistor R. 5V 10ohms R A. find a relationship between I and R in the circuit using E=I R and kirchoffs voltage law. B. the power to a resistor is given by

181. ## geomatry

the length of the radius of th dartboard is 9in. the diameter is represented by the expression 3x+3 write an equation that you cansolve for x then solve for x the x=5 but how do you work it out

182. ## Chemistry

a solid mixture is 3.00 grams and 65.0% NiCO3. How much nickel carbonate was lost if the sample was dissolved in 20.0 mL of water and washed with an additional 50.0 mL of water? I just don't know how to set up the problem..I don't need it solved, just set

still having problems on probability question with ratios and percents. If you surveyed 30 people (21 girls and 9 boys) and they picked differnt song genre's as their favorite. 3 out of the 21 girls picked country and 0 of the 9 boys picked country. The

184. ## physics

a motorboat is heading across a river at 6km/h in a direction making an angle 60 degree to the current. current is moving boat downstream at 3 km/h. what is the resultant velocity?

185. ## Calculus

a property owner wants to build a rectangular enclosure around some land that is next to the lot of a neighbor who is willing to pay for half the fence that actually divides the two lots. If the area is A, what should the dimensions of the enclosure be so

186. ## Physics

Marcy and joe are racing on their bikes. Starting from rest, if Marcy has an average acceleration of 5.7 m/s? for the first five seconds how fast was he traveling at the end of those five seconds?

187. ## maths

Daniel has a rabbit, a ferret, a gerbil, and a turtle. He feeds them in a different order each day. in how many different orders can Kelvin feed his pets?

188. ## science

explain the role of warm and cold air in the formation of tornadoes?

189. ## Algebra

How do I find the domain and range of the functions? 1. f(x)=2/3x - 4 2. f(x)= x^3-3x+2 3. f(x)= 1/2 l x-2 l 4. f(x)= l x-1 l / x-1

190. ## Physics

If you suddenly multiplied the mass of Earth by a factor of 4, how would the period of a satellite change, if the radius of its orbit did not change? 4 times as long 1/4 as long 2 times as long 1/2 as long Unchanged

191. ## math

what is the least number of tiles that are needed to completely cover a rectangular center piece 3 yards by 5 yards if a rectangular decorative tile is 2 inches by 3 inches respectively?

192. ## math

Get the number right. *None of the digits repeat. *It is between 20,000 and 77,777 *The digit in the thousands place is 3 times the digit in the ten thousands place *The ones digit is a prime number *The hundred digit is half the sum of the ones,

193. ## math

it takes the planet Neptune about 164.8 years to revolve once around the sun. What is the least and the greatest numbers written in hundredths that could round to 164.8?

194. ## statistics

An insurance firms wants to examine the relationship between text messages per day and insurance claims. The following data is a sample of 5 participants: Cellphone Texts per day (X) Insuance Claims () (Y) 4 800 18 2600 12 2800 26 0 20 6000 Choose the

195. ## English

I writing a compare/contrast essay on movie i watched that be smke signals. i got my thematic statement done, and i have to do thesis now, this is what teacher say Thesis: introduce the story and tag it. I not get how to start thesis? do i say In the

196. ## Physics

lightning strikes a tower 4 km away. how long after the strike will you hear the thunder? the speed of sound is 344 m/s

197. ## Math

You and a friend roll a pair of dice. The game is over either when you receive a sum of nine or when your friend receives a sum of six. Assume that you start first. What is the probability that you win. Note: For any round, if you receive a sum that is not

198. ## math

An initial-value problem is given by the differential equation, f(x,y)=x(1-y^2), y(1)=0.07 Use the Euler-trapezoidal method with a step-size h = 0.1, to obtain the approximate value of y(1.1). Give your answer to 4 decimal places.

199. ## math

it is required to make an open box of gregreatest possible volume from a square piece of tin,whose side is one metre' by cutting equal squares out of the corners and then folding up the tin to form the sides, what should be the length of a side of the

200. ## math ALG 2!

SOLVE |5A|=10......WITH STEPS! PLZ

216. ## Physics

Suppose you throw a 0.058-kg ball with a speed of 11.0 m/s and at an angle of 31.5° above the horizontal from a building 12.3 m high. (a) What will be its kinetic energy when it hits the ground? (b) What will be its speed when it hits the ground?

217. ## math

Consider the initial value problem, f(x,y) = y(18.06 - y), y(0) = 12. The exact solution of the problem increases from y(0) =12 to y = 18.06 as x increases without limit. Determine the minimum upper bound of h for the classical 4th-order Runge Kutta method

218. ## math

If the start time is 8:36 elapsed time is 3 hr 27 min What is the end time

219. ## math

An initial-value problem is given by the differential equation, f(x,y) = x + y, y(0) = 1.64 The Euler-midpoint method is used to find an approximate value to y(0.1) with a step size of h = 0.1. Then use the integrating factor method, to find the exact

220. ## chemistry

a typical E coli is 2um in length, how long is the E coli in nanometers??

221. ## chemistry

about how many bacteria (e coli) would you have to line up to stretch 1mm??

222. ## algebra

Solve for y, xy + x = -3 How do you do this? I can't seem to come up with the correct answer...

tony borrowed some money from Joe. he spent $5.50 of it on lunch and half of the on a movie ticket. To repay, he borrowed$10 from art.If tony started and ended with no money, how much did he borrow from Joe

224. ## Visual Literacy in Business

how do you fix this story using typography? Hi Danielle. I hope you’re doing great. I made a lot of progress on updating those pricing sheet documents yesterday, and have just a few more items that I need to address before they can be considered

225. ## chemistry

order Se, S, As, by increasing atomic radius? explain why?

226. ## Psychology

According to Erikson the first psychosocial crisis or conflict in life involves the:

227. ## Science

If a beam of blue light was shone through a glass prism, you would expect to see A. The beam pass straight through, unaltered B. The beam bent and split into a spectrum of colors C. The beam bent, but continue as a blue beam Or D. The beam absorbed and

228. ## PE

what is the common objectives between science curriculum and PE curriculum ?

229. ## Physics

A satellite sitting on the ground has a weight of 5000 N. When it is placed in orbit 500 km above the surface of the Earth (which has a radius of 6380 km), which choice best describes its weight? Very small but slightly greater than zero. Zero. Still 5000

230. ## Math

Suppose an odd function f has an inverse g. Prove that g is also odd.

Hello,I'm just confuse with this problem: Find the due dates of each of the following notes. 1.) Date of loan: October 16, 2001; Time: 120 days. My answer is February 14, 2002.. Im just wondering if my answer is correct.? Thanks.

232. ## Phyichs

How are solutions different from colloids and suspensions? Thank ya, sk8rgurl13

233. ## biology

What structure in the moss is like the spore case in ferns?

234. ## Chemistry

How to do significant values in Chemistry? I am totally stuck; I have no idea what to do? My teacher gave me C due to the significant value error. Please help

235. ## Physics

You are driving to the grocery store at 11.9m/s. You are 169.0m from an intersection when the traffic light turns red. Assume that your reaction time is 0.730s and that your car brakes with constant acceleration. How far are you from the intersection when

236. ## math

A function of three variables is given by, f (x,y,t) = x3y2sin t + 4x2t + 5yt2 + 4xycos t Find ft (3.44,0.58,8.1) giving your answer to 3 decimal places.

247. ## math

jade and isis are designing a soccer uniform they want use two colors on the shirt, their choices are green , orange, yellow, purple, blue silver. how many ways can they choose two colors?

248. ## Physical Science

The static frictional between a 500 kilogram box of bricks and the floor is 500 Newton’s. The kinetic frictional force in only 220 Newton’s. How many Newton’s of force must a worker exert to get the moving?

249. ## biology

draw digrams of phases of meiosis in a cell with 2N=. include with both divisional sequence, but not draw any of the subdivision of the phase e.g early prophase. distinghish between chromosomes from each parent, and detail the event of synapsis,

250. ## HELP

I am writing and essay for social studies and i only have a conclusion left please help!!!! The essay is about the war of England and Spain in the 1500's their war about cultures and i want to finish this essay so i need help with the conclusion!

251. ## math

number sense does the expression d-12 have a greater value when d=42 or when d=46

252. ## Calculus-math

Find an equation of the line that is tangent tothe graph of f and parallel tothe given line. Function: 1/square root of x Line: x+2y-6=0

253. ## Geometry

what are the next to terms in the pattern 7, 2, 5, -3, 8, -11

254. ## algebra

what is the least number of tiles that are needed to completely cover a rectangular center piece 3 yards by 5 yards if a rectangular decorative tile is 2 inches by 3 inches respectively?

255. ## PE

list the common objectives between science curriculum and PE curriculum ?

256. ## physics

Why should we add a the value 273 to change a celcius value in to kelvin.?

257. ## Language arts

Which is cause and which is effect? Truck hit her or Sandy hurt?

258. ## physics (graphs)

Hi, i'm doing a graph for density of an element as a function of atomic number. i'm trying to calculate the slope and it's asking me to include units. if density as a unit: g/cm^3, how would i write the units of the slope? which is basically density over

259. ## math

A function is given by, f(x)=e^-3x write down the third-order Taylor approximation for f(x) about x =0. Hence, evaluate f(0.258) giving your answer to 4 decimal places.

260. ## math

An initial-value problem is given by the differential equation, f(x,y)=-20xy^2, y(1)=1. Use the classical fourth-order Runge-Kutta method with a step-size of h=0.02, to obtain the approximate value of y(1.02). Give your answer to 6 decimal places.

261. ## math

A function of two variables is given by, f(x,y) = e^2x-3y Find the tangent approximation to f(0.989,1.166) near (0,0), giving your answer to 4 decimal places.

262. ## Physics

Locomotive A travels 100km/hr and locomotive B travels 140km/hr. Locomotive B starts 15 kilometers Behind locomotive A and travels on the same direction. Find the time elapsed and how far each traveled before they meet.

263. ## physics

An outfielder throws to the second baseman, a distance of 120ft at a 20degree angle. Whats the min velocity he has to throw the ball to get it to the base?

264. ## Physics

two locomotives start at the SAME place but Locomotive A gets a half hour head start. Locomotive A travels at 100 km/hr and Locomotive B travels at 140 km/hr.Find the time elapsed and how far each traveled before they meet.

265. ## physics

two masses one on an inclined plane at 30 degrees the other suspended

266. ## Biology

Some genes are said to be “linked”. Explain this term and the implications it has as to the inheritance of certain traits. Provide 2 (human) examples of linked genes? PLEASE HELP ITS A REQUEST

267. ## chemistry

whats an example of hydrogen bonding?

268. ## Physic

Can someone help me with this problem please. An indoor running track is square-shaped with rounded corners; each corner has a radius of 6.00 m on its inside edge. The track includes four 1.0 m wide lanes. What is the design speed on the innermost lane of

269. ## chemistry

a buffer is a substance which? a) accepts OH- in basic solution b) accepts H+ in acid solutions

270. ## College algebra

Find the maximum value of: y=-3x^2 -15x +1

271. ## English

Which one does not belong o? On April. December. November. June

272. ## Chemistry 011

what does Molar Mass mean?

273. ## Synonym

A synonym for "contrivance" will be spontaneity penance or strategy?

274. ## calculus

Find an equation of the line that is tangent to the graph f and parallel to the given line Function: f(x)= 1/ square root of x Line: x+2y-6=0

____= 8+2?

276. ## College Physic

I am having problem with this one physic problem. I am not sure where to start can someone help me? Thank You! A 15.0 kg box falls out of an Jet at an altitude of 3000 meters. It reaches a terminal speed of 50 meters per second in 3.20 seconds. Calculate

277. ## Math

A function of 2 variables is given by, f(x,y) = exp(2x-3y) Find the tangent approximation to f(1.155,0.632) near (0,0). Thanks!

278. ## math

Prime & composite numbers explain

279. ## Algebra

Maya has some group of stones. Then she throws 6 stones into the lake. Write an expression for the number of stones Maya has now. Tell what the variable represents.

280. ## chemistry

why should we add 273 to convert a given celcius value in to kelvin?

281. ## Math

Write a 4-digit number where the value of one digit is ten times more than the value of another.

282. ## math

A function is given by, f(x,y) = x^4 - y^2 - 2x^2 + 2y - 7 Using the second derivative test for functions of two variables, classify the points (0,1) and (-1,1) as local maximum, local minimum or inconclusive.

283. ## math

When i am rounded to the nearest tens I am 1,000. I am the same when read forward or backward, I can be two different numbers. Who am I?

304. ## math

3B216 + 2B316 =

305. ## Government

What is a simple definition of The Voting Rights Act of 1965?

306. ## Chemistry

Round this to two sig figs: 4025000 Is the correct answer 4.0 x 10^6?

325. ## Algebra 2

[(x^2+4x+3)/(2x^2-x-10)]*[(2x^2+4x^3)/(x^2+3x)]*[(x)/(x^2+3x+2)]