# Questions Asked onMay 5, 2011

1. ## Chemistry

You have 100.0 mL of 0.2500 M solution of NaCl sitting in a beaker. After several days you test the solution and find out that it is now 0.3721M. How much water must have evaporated?? I got 67.2 mL but its the wrong answer.. PLS HELP!

2. ## Chemistry

Balance in an acidic solution: S2O3^2- +OCL =CL^- +S4O6^2-

3. ## calculus

the volume of a rectangular box with a square base remains constant at 500 cm^3 as the area of the box increases at a rate of 3cm^2/sec. find the rate at which the height of the box is decreasing when each side of the base is 18 cm long.

4. ## trig

ABC is rightangled triangle. AD is the bisector of angle BAC. Angle DAC=15 degrees. X=CD. Find X. I know the answer is 7.1 but do not know how to do the actual sum. Can you please help AB = 23 CM

5. ## Calculus-rates

1.) A man 6 ft tall walks at a rate of 5 ft per sec. from a light that is 15 ft above the ground. At what rate is the top of his shadow changing? 2.) An airplane flies at an altitude of 5 miles toward a point directly over an observer. The speed of the

6. ## finance

Assume that the export price of a Nissan XTerra from Osaka, Japan is ¥3,750,000. The exchange rate is ¥121.84/\$. The forecast rate of inflation in the United States is 2.8% per year and is 0.6% in Japan. a. What is the export price of the XTerra at the

7. ## Chemistry

Magnesium metal reacts with hydrochloric acid to form magnesium chloride and hydrogen gas. Suppose we react an excess of magnesium metal with 13.2 mL of a 3.00 M solution of hydrochloric acid and collect all of the hydrogen in a balloon at 25oC and 1.00

8. ## physics

You are moving at 120 km/h toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?

9. ## Mathematics

What is the perimeter of a triangle of length 6cm, 8cm, 10cm?

10. ## College Algebra Application

Newton's Law of Cooling T(t)=T0+(T1-T0)e^-kt The police discover the body of a murder victim. Critical to solving the crime is determining when the murder was committed. The coroner arrives at the murder scene at 12:00pm. She immediately takes the

11. ## chemistry

ratio of lone pair on surrounding atom to central atom in Xeo2F2?

12. ## Math

A man has 2 pennies, 3 nickels, 1 dime and 2 quarters. How many different sums of money can he make using one or more of these 8 coins?

13. ## Math

2 apples weigh the same as a banana and a cherry.A banana weighs the same as nine cherries.How many cherries weigh the same as one apple

14. ## Algebra

A sack contains yellow marbles and black marbles. If one marble is drawn at random, the probability that it is yellow is 7/8. Six yellow marbles are added to the sack. Now, if one marble is drawn, the probability that it is yellow is 9/10. How many yellow

15. ## chemistry

Calculate the amount of heat released when 100 kg of water freezes at 0 degrees celius. Delta H fusion= 6.03 kJ\mol

16. ## physics

The bulk modulus of water is B = 2.2 x 109 N/m2. What change in pressure ÄP (in atmospheres) is required to keep water from expanding when it is heated from 11.2 °C to 38.8 °C?

17. ## Chemistry

Calculate the average mass, in grams, of an iron atom.

18. ## Chemistry (really need quick help)

Balance the following equations. (Use the lowest possible coefficients. These may be zero.) (a) As(s) + ClO3-(aq) ---> H3AsO3(aq) + HClO(aq) (acidic solution) I am using half-reactions but I don't really get this at all. Can someone explain?

19. ## chemistry

Question: When a pink aqueous solution of potassium permanganate, faintly acidified with dilute sulfuric acid was treated with 10% aq. hydrogen peroxide, the reaction took place with the evolution of gas bubbles, and the pink solution was turned colorless.

20. ## Algebra

x^2 + kx - 19 Find all values of k so that each polynomial can be factored using integers.

21. ## Chemistry

Methyl alcohol (wood alcohol), CH3OH, is produced via the reaction CO(g) + 2 H2(g) à CH3OH(l) A mixture of 1.20 g H2(g) and 7.45 g CO(g) are allowed to react. 4 points (a) Which reagent is the limiting reagent? (b) What is the yield of CH3OH? [Assume

22. ## finance

Farah Jeans of San Antonio, Texas is completing a new assembly plant near Guatemala City. A final construction payment of Q8,400,000 is due in six months [“Q” is the symbol for Guatemalan quetzals]. Farah uses 20% per annum as its weighted average cost

23. ## finance

A Canadian exporter, Victoria Exports, will be receiving six payments of €10,000, ranging from now to 12 months in the future. Since the company keeps cash balances in both Canadian dollars and US dollars, it can choose which currency to change the euros

24. ## math

A spherical balloon with radius r inches has volume V (r) = 4 3  r3 . Find the function f(r) that represents the amount of air required to inflate the balloon from a radius of r inches to a radius of r + 2 inches.

25. ## chem

Ascorbic acid, H2C6H6O6, is a diprotic acide with a K1= 7.9 E-5 and a K2=1.6E-12. In a .005 M aq solution of ascorbic acid which of the following species is present in the lowest concentration. 1. H2O 2. H3O+ 3. H2C6H6O6 4. HC6H6O6- 5. C6H6O6-2

26. ## ENGLISH 1

I had to read the story and answer the questionss.. correct my answers? possibly mrs. sue! :D Epic from The Odyssey by Homer, translated by Robert Fitzgerald Two nights, two days, in the solid deep-sea swell he drifted, many times awaiting death, until

27. ## Chemistry

compared to an ordinary chemical reaction, a fission reaction will 1 release smaller amounts of energy 2 release larger amounts of energy 3 absorb smaller amounts of energy 4 absorb larger amounts of energy is it 2 ?

28. ## algebra

7x + 3y = 42 graph this equation using the intercepts method graph this equation using the intercepts method

29. ## geometry

Find the value of x if m arc adc=5(x-3) and angle abc=165 degrees.

30. ## Chemistry

Calculate the molar hydroxide ion concentration of each of the following solutions given the pH: pH=0.90 AND pH=1.62 I know to covert from ph to hydroxide but i'm having a problem going from hydroxide to ph..can someone please help me..thanks

31. ## physics

A sound wave has a frequency of 707 Hz in air and a wavelength of 0.50 m. What is the temperature of the air?

32. ## math

Find the area of a rhombus with a perimeter of 20 meters and a diagonal of 8 meters

33. ## Physics

Halley’s comet orbits the Sun with a period of 76.2 years. a) Find the semi-major axis of the orbit of Halley’s comet in astronomical units (1 AU is equal to the semi-major axis of the Earth’s orbit Physics - drwls, Thursday, May 5, 2011 at 8:51am

34. ## Chemistry

Calculate the mass percent (m/m) for the solute in 2 grams of KOH in 20.0 grams of H2O? How do I set this up?

35. ## chemistry

how would you make one gram potassium chloride with barium chloride and potassium carbonate

36. ## Chemistry

If 609.5 grams of vanadium (II) oxide, VO, and 832 grams of iron(III) oxide, Fe2O3, are put into a container and allowed to react according to the equation above, which substance(s) and how many grams of each would be present in the container after the

37. ## MATH

You purchased 150 ft. of chain that normally sells for \$0.15 per inch. You were charged \$22.50 for the sale. Was the price correct? If not, what is the correct price and what mistake was made?

38. ## Chem

Assign an oxidation state to each atom in each of the following compounds. Fe(CN)3 Fe: 3+ (i know this is correct) C N im not sure about the other two

39. ## chemistry

When hydrochloric acid reacts with zinc metal, zinc chloride and hydrogen gas are produced. How many moles of hydrochloric acid are needed to react with 2.3 moles of zinc?

40. ## Maths

How can answer this question ,help please? Information: A ship travels at a constant speed of 25 kilometres per hour (Kph) in a straight line from port A located at position (x_A, y_A) =(-100, -100) to port B at (x_B ,y_B )=(300 ,100) During its journey

41. ## chemistry

When hydrochloric acid reacts with zinc metal, zinc chloride and hydrogen gas are produced. How many moles of hydrochloric acid are needed to react with 2.3 moles of zinc?

42. ## Algebra

Use the function below to answer the following parts. f(x) = 1/3x - 4 if -6 ¡Ü x < ¨C 3 2 if ¨C 3 < x < 3 x^2 ¨C 4 if x > 3 I know that: Domain= [-6,infinity] Range= [-6,infinity] and points of discontinuity = x=-3,x=3 How do i graph these functions?

43. ## algebra

A number cube is rolled three times. What is the probability of rolling a 5 at least once?

44. ## AP US History Exam

Is it worth it to study for the AP US HIstory or AP European history exams the night before, or should I just get a lot of sleep and eat breakfast?

45. ## Finance

Dzell Printers, Inc. (DZ) of the United States exports computer printers to Brazil, whose currency, the reais (symbol R\$) has been trading at R\$3.30/US\$. Exports to Brazil are currently 100,000 printers per year at the reais equivalent of \$140 each. A

46. ## Math - Ellipses

Foci (0,-3)(0,3) Vertices (0,-4)(0,4) Find the standard form

47. ## Science

A pressure of 2 KPa is acting on a gas with a volume of 60 liters. If the pressure decreases to 1 kPa, what volume will the gas occupy?

48. ## physics

what is the diameter of a 1.00 m length of tungsten wire whose resistance is 0.22 ohms?

49. ## Physics

Suppose you wish to visit a star which is 450 light years away, and that you want your 21000 kg rocket to move so fast that you only age 20 years during the round trip. a. How fast must the rocket travel relative to the Earth? Give your answer as the

50. ## algebra 2!

Given f(X)=the square root of x-2 and g(x_=6/x-3 (+1), write the composite function g(f(x)) and state its domain. Where is the resulting function defined?

51. ## Chemistry

Calculate the pH of a solution that is made by mixing 10.00 mL of 0.2500 M HCl with 35.00 mL of .1500 M HNO3 and diluting the mixture to a total volume of 100.00 mL

52. ## latin

The most significant reason for the decline of the Latin Grammar School was that it:

53. ## geometry

find the measure in degrees of the total of 1 and 2 in square

54. ## earth

Atmosphere Homework! 1.Which of the following layers of the atmosphere is closest to space? 2.A barometer measures? 3. The atmosphere contains tiny solid particles called what? 4.The process by which the atmosphere slows Earth's loss of heat to space is

55. ## Chemistry

A sample of gas is in a 50.0mL container at a pressure of 86 kPa and a temperature of 25°C. The entire sample is heated to a temperature of 35°C and transferred to a new container whose volume is 65.0mL. The pressure of the gas in the second container

56. ## trig

ABC is rightangled triangle. AD is the bisector of angle BAC. Angle DAC=15 degrees. X=CD. Find X. I know the answer is 7.1 but do not know how to do the actual sum. Can you please help.

57. ## Help Evaluating Integrals

1.) ∫ (2)/(x-4) dx 2.) ∫ sec^2x tanx dx 3.) ∫ 2 csc^2 xdx 4.) ∫ (3) / sqtr(x+3) dx 5.) ∫ (2x-1) / (x^2 - x)

58. ## Chemistry

Calcium carbonate, CaCO3(s), decomposes upon heating to give CaO(s) and CO2(g). A sample of CaCO3 is decomposed, and carbon dioxide is collected in a 250 mL ﬂask. After decomposition is complete, the gas has a pressure of 1.3 atm at a temperature of

59. ## economics

Explain the effect on a company’s stock price today of the following events, other things held constant. a. the interest rate on the company’s bonds falls. b. Several companies in the same sector announce surprisingly slow sales. c. Changes in the tax

60. ## Hspanic Literature

Need someone to proofread a college papaer for a Spanish Literature graduate class... anyone interested>

61. ## physics

A solid aluminum sphere has a radius of 2.28 m and a temperature of 89.1 °C. The sphere is then completely immersed in a pool of water whose temperature is 11.9 °C. The sphere cools, while the water temperature remains nearly at 11.9 °C, because the

62. ## IT Technology

What were the examples of database technology and how would they help with information policies?

63. ## physics

A solid aluminum sphere has a radius of 2.28 m and a temperature of 89.1 °C. The sphere is then completely immersed in a pool of water whose temperature is 11.9 °C. The sphere cools, while the water temperature remains nearly at 11.9 °C, because the

64. ## Algebra

Im having a hard time figuring out this problem: Use the function, y=-(x+1)^2 +2, to answer the following parts. The increasing interval and decreasing interval To find both I believe that: increasing : x < -1 decreasing : x > 1 So is this on solution

65. ## Math

Find the first five terms of each sequence, defined by the given rule. An=6N-2

66. ## physics

At a fabrication plant, a hot metal forging has a mass of 78.5 kg and a specific heat capacity of 426 J/(kg C°). To harden it, the forging is quenched by immersion in 788 kg of oil that has a temperature of 30.3 °C and a specific heat capacity of 2770

67. ## physics

When combined together, what is the weight (NOT MASS) of the moving pucks?

68. ## free verse poems please

i need really good examples of free verse poems please

69. ## Law

Explain how common laws and precedents come into being.

70. ## physics

find the maximum voltage that can be applied to a 8 kohm resistor rated 0.50 Watt?

71. ## physics

The vertical surface of a reservoir dam that is in contact with the water is 200 m wide and 14 m high. The air pressure is one atmosphere. Find the magnitude of the total force acting on this surface in a completely filled reservoir. (Hint: The pressure

72. ## Science-6th

I'm having some trouble with this thing in science. It wants us to list four members of the Protist kingdome. I already have 3, algae, protozoa, and slime molds. I can't think of a 4th one! Help please!

73. ## social studies

how geography influenced the expansion of greece?

elaborate the tasks of a manager : planning , co ordinating , controlling , commanding andorganzing .

75. ## chemistry

Can the half cell electrochemistry experiment using a pH meter and aqueous solutions of Cu, Cu2+ and Ag and Ag+ be used to measure even lower concentrations, such as 10^-23 mol of Cu2+ or a single free copper ion in solution? Please explain.

76. ## math

solve -4+7logx=10 & log(x+3)+log(x-2)=log14

77. ## chemistry 1100

If 5.00G of ethanol is added to 15.0G of water, what is the % concentration of ethanol in water ? (% to the correct number of significant figures) and the formula used to get there. THANKUUUU

78. ## Chemistry

what is the primary result of a fisson reaction ? 1 conversion of mass to energy 2 conversion of energy to mass 3 binding together of two heavy nuclei 4 binding together of two heavy nuclei i think its 4, am i right ?

79. ## chemistry

how would you make one gram potassium chloride with barium chloride and potassium carbonate

80. ## Math

The surface area of a rectangular prism is 10.4 in2. What is the surface area of a similar prism that is larger by a scale factor of 3? I am tearing my hair out over this question! Please help asap!

81. ## chemistry

hi, if 5.00g of ethanol is added to 15.0g of water, what is the % concentration of ethanol in water? (% to sig fig)

82. ## science

If the soluton of ammonium chloride is heated to 75 degrees celcius, is the solution now sturated or un saturated?

83. ## physics

what is the diameter of a 1.00m lenght of tungsten

84. ## math

show me fraction that are more than one half using 0-9

85. ## trig

(1/m)= (m-34)/(2m^2)

86. ## Chemistry

which process occurs in a controlled fusion reaction? 1 light nuclei collide to produce heavier nuclei. 2 heavy nuclei collide to produce lighter nuclei. 3 neutron bombardment splits light nuclei 4 neutron bombardment splits heavy nuclei. is it 1 ?

87. ## childhood and family development

Suppose that a preschool class has twelve students, among whom nine languages are spoken. If you were the teacher of this class, what would be your plan to help the children communicate with you and their classmates?

88. ## m-100

find the slope-intercept form of the straight lines,given by the following equations: (a) -4x + 2y =4 (b) 2x = 1-4y

89. ## m-100

write an equation for the srtaight line that satisfies the given conditions. (a) Through (-2,-2); slope -1 (b) Through (4,2); slope 1/2.

90. ## physics varsity

tarzan(85 kg) tries to swing across a river hanging from a monkey rope(10m)long as he reaches bottom of his swing he os travrlling at 8m/s but he doesn't realise the rope has a breaking strength of 1000N.does he make it safely across the river

91. ## m-100

Sketch the graph of each linear function. Give the domain and range. (a) f(x) = -2x + 1 (b)f(x) = -3.

92. ## Science

There's a grauph and obove the grauph it says gravity (mass movement) and then it says pg 67 69 and i dentify 4

93. ## Chemistry

If 10.4 mols of hydrogen, H2, and 9.1 mols of oxygen, O2, are placed together in a container and allowed to react according to the following equation, which one, if any, is in excess and by how much? Also, how many moles of water, H2O, would be produced by

94. ## Sociology

Does the implications of a social movement mean that we are increasingly becoming a nation made of minority groups rather than a nation with a significant majority group that shares the same values, ambitions and dreams?

95. ## computer or math

pls help me to solve this question. thank you very much binary-decimal conversion a.101= b.1100= c.100110= d.111111= decimal binary conversion a.1216 10 b.2121 10

96. ## IT/210

I need help with my assignment called o List the application-level requirements

97. ## math (consumer arithmetic)

a compact disk player is bought on the following terms: deposit: \$80.00 Installments: \$43 per month for one year Calculate the total price paid.

98. ## english

please correct my grammar. thank you very much to you and your is willing to employ me. I hereby certify that the above information is true and correct to the best of my knowledge. please I need your advise or advice

99. ## math

a guest at a party takes a sanwich from a tray. a second guest then takes a sandwich

100. ## Math

Is 3/4 bigger than 12/56?

101. ## biology

Sugar maple trees are tapped in the spring. how far into the tree would you haev to go to tap the syrup?

102. ## Math

x + 5/8 = - 1/4

103. ## algebra

15-4x=1(3x+1)

104. ## chemistry

Does water or chloride ion bond more strongly to the cobalt(II) ion?

105. ## math

if 7000 is placed in an account with 6 percent intrest compounded annually how many years does it take to triple? rounded to two decimals.

106. ## College Algebra

Change 2x^2-5x=25 to standard form. Then find the solution set.

-8y+1=-9y+2

108. ## math

how to solve sales tax

109. ## math

Someone please help me with this question. What would happen to an equation if you solve from right to left instead of left to right? And please provide an example.

110. ## math

triangle abc is congruent to triangle wxy

111. ## Geometry

Find the area of a rhombus with a perimeter of 20 meters and a diagonal of 8 meters

112. ## Algebra II

x^2 -12y = 12x -12 is a graph of a(n) a) Ellipse b) circle c) parabola d) hyperbola

113. ## Art Appreciated

Discuss how the Late Gothic sense can be seen as an evident in Berlinghieri's St. Francis Altarpiece.

114. ## Chem

balance the half-reaction. (Type your answer using the format CO2 for CO2, [NH4]+ for NH4+, and [Mg]2+ for Mg2+. Use the lowest possible coefficients.) I am sooo confused (a) S(s) --> H2S(g) thanks

115. ## Composition 11

What aspect of writing an introduction do you anticipate will be a challange for you?

116. ## Physics

Halley’s comet orbits the Sun with a period of 76.2 years. a) Find the semi-major axis of the orbit of Halley’s comet in astronomical units (1 AU is equal to the semi-major axis of the Earth’s orbit Physics - drwls, Thursday, May 5, 2011 at 8:51am

117. ## stats

A particular college basketball player is a 80% free throw shooter. In a game, he took 20 free throws. Find the probability he made 18 or more of his free throws.

118. ## math

Condensing 1/2logs+logm+logh-2logI-logd-logk logt+logh+logx-2logl-log0-logl

119. ## math

Simplify: [5(4-x) + (25-9)] + [63(5y + 15) – 4]

120. ## Chemistry

with regard to the reaction of sodium with chlorine (2 Na + Cl2 = 2 NaCl); if 1.0 mole of Cl2 is heated in the presence of 6.0 moles of sodium metal, how many moles of NaCl will be formed?

121. ## math

Scenario: Regression equations are created by modeling data, such as the following: Sales = (Cost Per Item × Number of Items) – Constant Charges In this equation, constant charges may be rent, salaries, or other fixed costs. This includes anything that

122. ## how to talk more effectively

it is important for good speakers to have (a)self confidence (b) enthusiasm (c)good observational skills (d)all of these

123. ## Math

Arrange from smallest to largest 3/7 1/7 5/7

124. ## accounting

What potential problem can arise if a company incorrectly classifies costs? Example, what if an inventoriable cost is classified as a period costs?

125. ## Math

Is it 1/7 3/7 5/7 .

126. ## chemistry

Does water or chloride ion bond more strongly to the cobalt(II) ion?

127. ## finance

Delphi is the US-based automotive parts supplier that was spun off from General Motors in 2000. With annual sales of over \$26 billion, the company has expanded its markets far beyond the traditional automobile manufacturers in the pursuit of a more

128. ## physics

find the maximum voltage that can be appliedto a 8 k ohm resistor rated 0.50 watt?

129. ## us history

What is one way italy threatend world peace in the 1930?

130. ## ACCT211

Classiflying Manufacturing Costs The PC works assembles custom computers from components supplied by various manufactures. The company is very small and it assembly shop and retail sales store are housed in a single facility in a Redmond, Washington,

131. ## finance

The owners’ equity accounts for Octagon Transnational are as follows: Common Stock [\$2 par value] \$20,000 Capital Surplus 360,000 Retained Earnings 1,173,000 Total owners’ equity \$1,553,000 a. If Octagon’s stock currently sells for \$50 per share and

132. ## government

in what court may redress from the united states be secured?

133. ## Math

The height of a golf ball that is hit into the air with an initial vertical velocity of 112 feet per second is given by the equation h=-16t^2 + 112t, where t is the time in seconds. After how many seconds is the ball at a height of 96 feet above the

134. ## physics

find the maximum voltage that can be applied ti 8 k ohms resistor rated 50 Watt?

135. ## Algebra

Write the equation for this situation.During the month of February, the depth, d, of snow in inches at the base of one ski resort could be approximated by adding 7 to twice the number of days, t, since Janurary 31st.

136. ## physics

what is the magnitude and direction of the electric field 20.0 cm directly above an isolated 33.010 neg6 C charge?

137. ## Math / Calculus

Use implicit differentiation to find an equation of the tangent line to the cardioid at the point (0,0.5) x^2+y^2=(2x^2+2y^2-x)^2 Y=

138. ## math

How to complete the following number sentences so that the answer to each is 1. x/100 + 6/100 +75/100 =1 x/10- 2/10- 4/10 -2/10 = 1

139. ## islam

a.What does “seven earths” as implied in verse 12 surah at-Talaq actually mean? b.Why does the Quran use only a singular noun(al-ardhu) when describing the earth(or seven earths) in this case whereas when describing seven heavens a plural noun

140. ## math

a stoplight flashes red for 50 seconds, yellow for 5 seconds, and green for 65 seconds. For what fraction of a 24-hour day is the stoplight yellow?

141. ## novel

"Big Girls Don't Cry" Rebecca Traister How does Traister define feminism? Would Hillary Clinton count as a feminist according to Traister? Would Sarah Palin? How are the shifting images of the candidates and their spouses evidence of the performative

142. ## Algebra

the length of a rectangle is 5m more than twice its width. and the area of the rectangle is 88m^2. find the dimensions of the rectangle.

143. ## creative writing

Is there a personification example in the song: Did You Ever Know That You're My Hero

144. ## physics

You remove two socks from a hot dryer and find that they repel with forces of 0.003 N when they’re 4 cm apart. If they have equal charges, how much charge does each sock have?

146. ## physics

If you were to separate all of the electrons and protons in 1 g (0.001 kg) of matter, you’d have about 96,000 C of positive charge and the same amount of negative charge. If you placed these charges 5 m apart, how strong would the attractive forces

147. ## islamic

One of the important teachings of Islam is to be truthful. It is no doubt relevant when dealing with people/society. However does it apply equally in the realm of our psychology & subsconscious mind? In Psychology,it is a well known fact that one can

148. ## Math

3/5*(1/4+1/2)*20/3=

149. ## U.S. History

Why was separation of the races required?

150. ## sociology

What is (near) infinite wealth?

151. ## History

For my history class I have to do a research report about a social topic and I want to talk about cults. My teacher said to choose one and I chose Heaven's Gate. At first I was going to talk about the harmful effects of cults but after researching it, it

152. ## Psychology

Dr. Lange is a developmental psychologist. He specializes in cognitive development during the period of infancy. Like most psychologists who focus on specific periods of development, his studies: a emphasize the chemical changes in the synaptic gap. b

153. ## U.S. History

Why was separation of the races required on the transit system in Montgomery, Alabama during the 1950s?

154. ## chemistry

determine the pH of 0.15M ammonia assuming the dissociation value of ammonia is Kb=1.8*10^-5

155. ## criminal justice

what is mean median and mode and formulas

156. ## College Chemistry

A rock containing 238U and 206Pb was examined to determine its appropriate age. The molar ratio of 206Pb to 238U was 0.1462. Assuming no lead was originally present and that all lead formed remained in the rock. What is the age of the rock in years? The

157. ## Math

Use the right triangles to find the ratios. Sin 30 degrees

158. ## science

Calculate the amount of potential energy a 3 kg can of paint has when it is placed on top of a ladder that is 2.5 m in height 1.2j ?

159. ## College Chemistry

How much time in years (assume a 365 day yr) would it take for a 1.6678g sample of 239Np to decay to a mass of 0.8671g if it has a half life of 2.030*10^5s

160. ## chemistry dilutions

you have 47 mL of a 2 M stock solution that must be diluted to .5 M how much water should you add

161. ## Chemistry

Does water or chloride ion bond more strongly to the cobalt(II) ion?

162. ## MaTH

Is anyone good at using matlab

163. ## economics

Two companies, A and B, produce widgets. Each can produce 0, 1, 2, 3, or 4 widgets (they canâ€™t produce fractions of widgets). Let X be the number of units produced by A, and Y be the number of units produced by B. Given X and Y, widgets will sell at

x^2+5x-36

165. ## Chemistry

What is the molal concentration m of NaCl,a strong electrolyte in water, if the observed boiling temperature of the solution is 100.361⁰C? (Kb = 0.515⁰C/m for water.)

166. ## Government

What is the Virginia plan and the New Jersey plan?

167. ## chemistry

if 5.00g of ethanol is added to 15.0g of water, what is the % concentration of ethanol is water?

168. ## Chemistry

How much energy in KJ is release to form one mole of 123Sb from protons and neutrons if the atom has a mass of 122.90422 amu? Please remember to include the mass of electrons in calculations. Havent been taught this yet so a step by step walkthrough would

169. ## english

please correct any grammetical errors/tense errors and explain in order to improve my writing. Sara came to Hyderabad airport by flight. Then, she reached Begumpet by auto where she is received by john and escorted her up to the Greenvalley Apartment.

170. ## physics

Find the ratio of the gravitational force on the Moon due to the Earth to the gravitational force on the Moon due to the Sun. (The mass of the Earth is 5.97 1024 kg, the mass of the Moon is 7.36 1022 kg, the mass of the Sun is 1.99 1030 kg, and the average

171. ## chemistry

what are the acids, bases, conjugated nacids and conjugated bases of the equation H2O+H2O->OH-+H3O?

172. ## Physics

a)What speed must one frame of reference be moving relative to another for the two to disagree about the length by 1% b)What speed must one frame of reference be moving relative to another for the two frames to disagree about time intervals by 1%? Both

173. ## english

what are 3 arts of frankenstein in chronological order.

174. ## chem

Ascorbic acid, H2C6H6O6, is a diprotic acide with a K1= 7.9 E-5 and a K2=1.6E-12. In a .005 M aq solution of ascorbic acid which of the following species is present in the lowest concentration. 1. H2O 2. H3O+ 3. H2C6H6O6 4. HC6H6O6- 5. C6H6O6-2

175. ## math

Write 7 3/5 as an improper fraction

176. ## marketing

Hewlett-Packard sells personal computers through specialty computer stores, electronics superstores, and its own Internet site. The marketing mix variable that is being considered here is

Need to pick out the subject, verb and adjective 1. I like French Dressing. Subject=I verb=like adj=french 2. Where are my old jeans? subject=jeans verb=are adj=old

1. When a hurricand, flood, or pandemic strikes a country, who is most likely to respond. 2. Which economic system is the best solution for handling a crisis of epic proportion?

179. ## History

In what ways will climate change impact global society? Have to write a 4-5 page paper on this I am just needing some ideas. Thanks!

180. ## geometry

what is a factor firework

181. ## Lack of transportation

how much money do u spend on gas getting to college

182. ## math

what are the prime factors of 12?

183. ## game theory

Two companies, A and B, produce widgets. Each can produce 0, 1, 2, 3, or 4 widgets (they canâ€™t produce fractions of widgets). Let X be the number of units produced by A, and Y be the number of units produced by B. Given X and Y, widgets will sell at

184. ## Thermodynamics 2nd Law

The 2nd law of thermodynamics states that “in any spontaneous process, the total entropy of the universe always increases”. Yet in biological systems there are processes where there is a decrease in entropy during a reaction. Give an example of a

185. ## Math

Independent or dependent? In a group of 20 people what is the probability the 2 people have the same birthday?

186. ## psyhcology

in comparision to men with learning disorders, women? A.have higher self-esteem b.have better paying jobs c.out grow their difficulties d.have more relationship problems I chose d but i'm not to sure

187. ## history

What Defense Strategy Was Developed By The Late 1940s Because The US Lacked Sufficient Troops To Confront The Soviet Army In Eastern Europe?

188. ## math

A bag contains 6 red marbles nad 4 blue marbles if Dana draws one marble from the bag and then draws another without replacing the first, what is the probability that both marbles will be red?

189. ## pre cal

Write the equation of the tangent line to the parabola y^2=-1/2x at the point (-1,-2)

190. ## Algebra

Add and simplify: 2/x^2-16 + 3/x^2 -2x-8 Now if the numerator of your answer equals 6, what does x equal? My answer of 5x+16/(x-4)(x+4)(x+2) does not match theirs. The correct answer is -2. I don't know how they got there.

191. ## math

If you have a trapezoid that is divided into two triangles to find the area would you find the area of each triangle then add the two areas together?

192. ## algebra 2!

A swimmer is racing to the other side of the pool. The pool is 75 feet long. The swimmer travels 2.5 feet per second. Create a table, equation, and graph to represent the swimmer's distance to the other side of the pool with relation to time. When will the

193. ## math

Need to write an equivalent fraction for each, using the least common denominator. 1. 7/9, 1/6 ANSWER=12/18,14/18

194. ## algebra 2!

Evaluate the piecewise function f(x)= 7 if x is < or equal to -4; -14 if -4

195. ## child care

The most common underlying feature associated with reading disorders is? A Associated new words with those in memory. B.visually processing the shapes of letters. c.interpreting the meaning of words d.distingushing or seperating sounds in spoken words i

196. ## maths stats

Please unscramlbe aaeebllnn which is a name. Thanks

197. ## College Algebra

Solve using Elimination or Substitution: 4x^2+9y^2=36 x+3y=3

198. ## Physics

Halley’s comet orbits the Sun with a period of 76.2 years. a) Find the semi-major axis of the orbit of Halley’s comet in astronomical units (1 AU is equal to the semi-major axis of the Earth’s orbit

199. ## PSY/315

Is a coefficient of variation a better measure of dispersion than variance?

200. ## Phsyics

I want help with this question. I keep getting it wrong. Please help! Estimate the total amount of translational kinetic energy in a small classroom at normal room temperature. Assume the room measures 5.00 m by 12.0 m by 4.00 m.

202. ## math

the sum of the ages is 48, Bailey's mom is 15 more than twice his age. what is the ages of the two?

203. ## Chemistry Titration Lab

Calculate the theoretical pH after 2.50 mL and 9.50 mL of NaOH has been added in both the titration of HCl and of HC2H3O2. Given: Molarity of all chemicals are 0.1 M HCl and HC2H3O2 are 8ml prepared in 100ml water. Im guessing I need to make and ICE chart

204. ## Statistics

jenny is 5'10" tall. the heights of the girls in the school are approximately normally distributed with a mean of 5'5" and a standard deviation of 2.6". What is the percentile of jenny's height?

205. ## Algebra

Use the function below to answer the following parts. 1/3x - 4 if -6 3 I found out the domain, range, and points of disontinuity. I think i did them right: Domain= [-6,infinity] Range= [-6,infinity] and points of discontinuity = x=-3,x=3 How do i graph

206. ## math

if a game is started at 7:48am and finishes at 10:58am ... how do I figure how many hours and minutes it took to finish the game?

207. ## Child Development

Temperatues in child care education settings should be set at------ in summer and ------ in winter

208. ## math

a bag contains 6 red marbles and 2 blue marbles. what is the probability of chosing a red marble and a blue marble at the same time?

209. ## Physics

If the change in position Dx is related to velocity v (with units of m/s) in the equation Dx = Av, the constant A has which dimension? a) m/s2 b) m c) s d) m2 I'm not sure how to eliminate the seconds from the velocity. Thanks in advance for any help!

210. ## Geometry

How do you find the slant height of a cone whose height is 8 feet and whose diameter is 16 feet.

211. ## math

A speedboat racer travels at a steady of 0.75 of a mile per 0.25 of a minute. How far does the boat travel in a half minute?

212. ## math

i need to know how to do number sentences 12/15-7/15+/15=1

213. ## math

12/15 - 7/15 + /15 =1

214. ## math

A speedboat racer travels at a steady rate of 0.75 of a mile per 0.25 of a minute. How many minutes does it take for the boat to travel 3 miles? I have 0.75 (is that correct?) How long will it take for the boat to travel 7.5 miles? I have 1.88 (is that

215. ## math

I need to complete the following number sentences so that the answer to each is 1 12/15 -7/15 + /15 =1

216. ## Geometry

What is the area of a circle formed by the intersection of a plane that is 24 mm from the center of a sphere whose radius is 30 mm.

217. ## Algebra 2

A rectangular play area will be enclosed using 100 yards of fencing. What is the maximum area that can be enclosed?

218. ## Algebra 2!!

A shed is designed so that its height is 8 meters less than its width, and its length is 10 meters greater than its width. If the volume is about 1,000 cubic meters, what is the width of the shed (to the nearest meter)?

219. ## chemistry

Assign an oxidation state to each atom in each of the following compounds. 1) Fe(CN)3 i know Fe= +3 but how do i find the oxidation state for C and N? does CN have a normal over all charge?

220. ## chemistry

so we did a chemistry lab to find the relationship between temperature and volume or charle's law. In the experiment, i got t1v1=372K, 267.2 cm^3 t2v2=277K,169.1 cm^3 so i graphed that THen they told us to chose 2 other points from that line, TaVa and TbVb

221. ## Earth Science

Which of the following layers of the atmosphere is closest to the ground?

222. ## physics

If 7.00hp are required to drive a 1500-kg automobile at 66.0 km/h on a level road. What power is necessary to drive the car at 66.0 km/h down a 1.00 % grade? It requires 42.9 hp to drive the car at 66.0 km/h up a 10.0 % grade (a hill rising 10.0 m

223. ## calculus

What's the derivative of f(x)=(x^2-1)(3x^3-6x+5)-4(4x^2+2x+1)

224. ## poems

I NEED EXAMPLES OF HAIKU POEMS

225. ## maths

Trigonometry query. ABC is a rightangled triangle. AD is the bisector of angle BAC. Angle DAC = 15 degrees. X = CD. find X. I know the answer is 7.1 but cannot work out the theory. Could you please help? Thankyou.

227. ## math

Find the general term: 4/3, 7/7, 10/11, 13/15,...

229. ## math

if a greater integer is being subtracted from a lesser integer, is the answer positive or negative?

230. ## Chemistry

Balance the following in an acidic solution:1]Fe ----> Fe(OH)2 & 2]NO3 -----> NH4^+

231. ## POEMS tanka poem

examples of tanka poems thanks

232. ## CHEMISTRY

My question is that how can fe=fe(oh2)be balanced in a basic solution....THANKS IN ADVANCE.

233. ## Chemistry Help!

An enzyme has one iron atom per molecule and contains .335% iron by mass. Calculate the molar mass of the enzyme

234. ## math

if a lesser integer is being subtracted from a greater integer, is the answer positive or is it negative?

235. ## Chemistry

A solution of sulfuric acid is 50.0% H2SO4 by mass and has a density of 1.15 g/mL. Calculate the molarity of the solution.

236. ## Integral Help

1.) ∫ (sin x) / (cos^2 x) dx 2.) ∫ (1) / (1+x^2) dx 3.) ∫ xe^x^2 dx 4.) ∫ x^2 sinx dx 5.) ∫ (lnx) / (x) dx

237. ## math

lcd 3/5x^3t, 8/125xt^3

238. ## English

Choose the sentence with the grammatical error below. Answer a. Although hemp and jute have similar qualities, they come from different plants. b. Traditionally made with bits of colored glass and mirrors, kaleidoscopes today may incorporate plastics and

239. ## physics

An elastic cord is 69 cm long when a weight of 57 N hangs from it but is 87 cm long when a weight of 85 N hangs from it. What is the "spring" constant k of this elastic cord?

240. ## math

A speedboat racer travels at a steady rate of 0.75 of a mile per 0.25 of a minute. How many minutes does it take for the boat to travel 3 miles? How long will it take for the boat to travel 7.5 miles?

241. ## English

Choose the sentence with the grammatical error below. Answer A Aristotle studied under Plato then later in his life he tutored Alexander the Great. B Some people consider a four-leaf clover a sign of good luck. C Before the invention of the printing press,

242. ## Chemistry

If 200 g. of an unknown metal oxide, M2O3, upon reaction with chlorine yields 376 g of M2Cl2, then the metal M is: a. Indium b. Aluminum c. Gallium d. Silicon e. boron

243. ## projectile physics

im a bit puzzled, please help me gain the sanity required for this confusion... suppose a ball is thrown from the top of a cliff, and i am supposed to get its final velocity; since when the ball reaches it maximum height, the vf which becomes the vi or

244. ## science

what is the hybridisation of H2o?

245. ## Math

Ms. Hendricks asked her students how they get to school each day. She collected their answers and determined the following results. • Half of her students take the bus. • 1 5 of her students walk. • The rest of her students ride with their parents.

246. ## PC Training & Business College

if 14 accidents can be expected at a certain intersection per week, what is the probability that there will be 3 accident at the intersection on a given day

247. ## Math

Teresa put tiles marked with the letters of her name into a bag. The back of each tile is blank. The tiles are shown below. T E R E S A Without looking into the bag, Teresa will pick a tile. a. What is the probability that Teresa will pick a tile with the

248. ## Math

We are doing multi-step equations in math. And this equation is kind of hard for me because the variable is alone. h-6+7h=42 What does "h" equal?

249. ## statistics

1. A random sample of n = 16 scores is selected from a normal distribution with a mean of µ = 50 and a standard deviation of á = 10. What is the probability that the sample mean will have a value between 45 and 55? What is the probability that the sample

250. ## English

Tanya trusts others beside her best friend. Do I need an "s" after beside?

251. ## science

plunger a has an area of 54cm and plunger b has an area of 15cm, how much more force can be exerted by plunger b

252. ## science

What is the relationship between DNA, chromosomes, alleles and genes?

-What contains DNA? -Where is DNA found?

254. ## physics

A lead sphere has a diameter that is 0.050% larger than the inner diameter of a steel ring when each has a temperature of 27.9 °C. Thus, the ring will not slip over the sphere. At what common temperature will the ring just slip over the sphere

255. ## basic grant writing

what are the differences between competitive and noncompetitive grants?

256. ## math

how to find the area of a sector when the radius is 8 and you leave it in terms of pi

257. ## Social studies

What are some negative impact of technology?

258. ## physics

During an all-night cram session, a student heats up a 0.420 liter (0.420 x 10- 3 m3) glass (Pyrex) beaker of cold coffee. Initially, the temperature is 19.4 °C, and the beaker is filled to the brim. A short time later when the student returns, the

259. ## chemistry

Here's the problem: You need to make 300L of 2.25M perchloric acid. It costs \$25.95 for a 4.00 liter bottle of 60% HClO4, and \$34.95 for a 4.00 liter bottle of 70% HClO4. Should you buy the 60% or the 70% bottles? Show your calculations and explain.

260. ## science

when marble undergoes CaCO3+ H2SO4 = CaSO4+H2O+CO2, what happens to it and where can one see the evidence of this effect?