# Questions Asked onOctober 1, 2007

1. ## Science (big idea of energy)

What is the big idea of energy????? It says : for level 6: "Explained the reaction using the big idea of energy" what does it mean by the big idea of energy????

2. ## Chemistry

How many kilograms of chlorine are in 30kg of each of the following chlorofluorocarbons (CFC's)? CF2Cl2 -in kg's; CFCl3 -in kg's; C2F3Cl3 -in kg's?

3. ## CHEM

A particular coal contains 2.55% sulfur by mass. When the coal is burned, it produces SO2 emissions which combine with rainwater to produce sulfuric acid. Determine how much sulfuric acid (in metric tons) is produced by the combustion of 1.1 metric ton of

4. ## chem

Question: The American Dental Association recommends that an adult female should consume 3.0mg of fluoride (F-) per day to prevent tooth decay. If the fluoride is consumed as sodium fluoride (45.24% F), what amount of sodium fluoride contains the

5. ## Chemistry

Zn+ 2HCl -> ZnCL2+h2 what volume of hydrogen at stp is produced when 2.5 of zinc react with an excess of hydrochloric acid

6. ## chemistry

how many oxygen atoms are in 1.60g of quartz - SiO2? how do you figure out atoms to grams and visa versa? the weight of 1 SiO2=60.0848g/mol. please help

7. ## Chemistry

2 HCl (aq) + Ba (OH2) (aq) ----> BaCl2 + 2 H20 (l) deltaH = -118 kJ Calculate the heat when 100.0 mL of 0.500 M HCl is mixed with 300.0 mL of 0.100 M Ba(Oh2). Assuming that the temp. of both solutions was initially 25.0 degrees C and that the final mixture

8. ## pre-calc

a farmer wants to make a rectangular enclosure using a wall as one side and 120 m of fencing for the other three sides. a) express the area in terms of x and state the domain of the area function b)find the value of x that gives the greatest area. my

9. ## CHEM

How do I work the following question? I found the amu of CaCO3=101.0872g/mol; 2HCL=72.92128g/mol; H2O=18.1582g/mol;CO2=44.0098g/mol; and, CaCl2=110.9834g/mol. You carefully weigh out 10.00g of powder and add it to 40.50g of solution. You notice bubbles as

10. ## Economics

As price falls along the elastic portion of a linear demand curve, _______ decrease while _______ increase. Answers. A. only price; quantity demanded , consumer surplus, and consumer expenditures B. consumer surplus and price; quantity demanded and

11. ## CHEM

A 5.00 g sample of Al pellets (specific heat = .89 J/g degrees c) and a 10.00 g sample of Fe pellets (specific heat = .45 J/g degrees c) are heated to 100.0 degrees C. The mixture of hot Fe and Al is then dropped into 97.3 g of water at 22.0 degrees C.

12. ## CHEM

A 5.00 g sample of Al pellets (specific heat = .89 J/g degrees c) and a 10.00 g sample of Fe pellets (specific heat = .45 J/g degrees c) are heated to 100.0 degrees C. The mixture of hot Fe and Al is then dropped into 97.3 g of water at 22.0 degrees C.

13. ## science

were doing simple machines and on my paper it shows a door knob What simple machine is that ( lever,wedge etc.) And my sec que it also shows scissors what simple machine is that?

14. ## mathematics 1

At a party each person is to be served 1/4 of a pizza. how many people can be served from 8 pizzas?

15. ## mathematics 1

At a party each person is to be served 1/4 of a pizza. how many people can be served from 8 pizzas?

16. ## Algebra

Find two positive real numbers that differ by 1 and have a product of 1.

17. ## Science-Chemistry

A 5.00 g sample of Al pellets (specific heat = .89 J/g degrees c) and a 10.00 g sample of Fe pellets (specific heat = .45 J/g degrees c) are heated to 100.0 degrees C. The mixture of hot Fe and Al is then dropped into 97.3 g of water at 22.0 degrees C.

18. ## Managerial Economics

If the price of computers falls 6 percent during a period when the level of average prices falls 12 percent, the relative price of computers compared with other goods: a) Stays the same. b) Increases. c) Decreases. d) More information is required to answer

19. ## Social Studies

What was the purpose of the Seven Years’ War? What effects did it have on the(American)colonies?

20. ## physics

If a car is accelerating downhill under a net force of 3,674N, what force must the brakes exert to cause the car to have a constant velocity?

21. ## Economics

Suppose that the average earnings for high school graduates is \$25,000, the tuition, fees, and books for typical year of college total \$10,000 and that a college degree takes 5 years. a) How large must the present value of the increment to earnings from

22. ## Chemistry

My question is very simple Why do metals when react with oxygen are called oxides like " magnesium oxide" whereas non metals reacting with oxygen become dioxides like "carbon dioxides" , note that the two react with oxygen which has 2 molecules

23. ## science

Please, where would decomposers go on a food web? I was thinking about putting them at the top and having all of the consumers' arrows point to them and then have an arrow pointing from the decomposers to the producers because don't decomposers decompose

24. ## Algebra

A homeowner wishes to insulate her attic with fiberglass insulation to conserve energy. The insulation comes in 40-cm wide rolls that are cut to fit between the rafters in the attic. If the roof is 6 m from peak to eave and the attic space is 2 m high at

25. ## Quanitive Methods

A car rental company has \$540,000 to purchase up to 25 new cars of two different models. One model costs \$18,000 each and the other model costs \$24,000 each. Write a system of linear inequalities to describe the situation. Let x represent the first model

26. ## Math

(Preferably answered by tomorrow night - that's plenty of time.) Ray OB is the bisector of angle AOC and ray OC is the bisector of angle BOD. m of angle AOC = 60. Find m of angle COD. *m means "measure" Write a proof in two-column form. Given: ray DC is

27. ## chem

A particular coal contains 2.55% sulfur by mass. When the coal is burned, it produces SO2 emissions which combine with rainwater to produce sulfuric acid. Determine how much sulfuric acid (in metric tons) is produced by the combustion of 1.1 metric ton of

28. ## Biology

What will happen when deionized water is added to red blood cells and then left to sit for 15 minutes? Will the blood cells mix with the water immediately and make a paler solution or will they be more dense than the water and sink to the bottom?

29. ## physics

If a car travels westward with a constant velocity of 20 m/s, what is the net external force acting on it?

the wind blowing on a vertical surface varies jointly as the area of the surface and the square of the velocity. if a wind of 40 mph exerts a force of 50 pounds on a surface of 1/2 square foot , how much force will a wind of 80 mph place on a surface of 2

31. ## Algebra

The lesser of two consecutive even integers is 10 more than one-half the greater. Find the integers.

32. ## math-calculus

Hi i've been struggling over this question for a while. Can anybody help me with this? A body's velocity at the time t sec is v = 2t^3 - 9t^2 +12t - 5 m/sec. Find the body's speed each time the acceleration is zero. ________________________________ What i

33. ## Math

Kevin's wife picks him up after work every day at 5:30 pm. One day, he leaves at 4:58 pm, and starts walking home. She pick him up along the way , and when they get home, he notices that they saved four minutes. How long did Kevin walk? :)

34. ## Algebra

The lesser of two consecutive even integers is 10 more than one-half the greater. Find the integers.

35. ## physics

Can Newton's be negative?

36. ## Physics

A bike rider accelerates constantly to a velocity of 8.0 m/s during 4.2 s. The bike's displacement during the acceleration was 19 m. What was the initial velocity of the bike?

37. ## Physical Science

On a worksheet labeled "Using The Balance"... The instructions are "The following balances measure mass is grams. What masses are shown on each of the following balances?" There are ruler balances on the work sheet with 3 lines of numbers and balance marks

38. ## math

Suppose that the average earnings for high school graduates is \$25,000, the tuition, fees, and books for typical year of college total \$10,000 and that a college degree takes 5 years. a) How large must the present value of the increment to earnings from

39. ## algebra

sorry...I have alot of homework and these are afew questions i don't understand. please see last post thank you

40. ## Pre-Algebra

help me calculate this - my 6th grade nephew has this question for homework and I'm at a loss. The combined age of 2 people is 91. Person A is two times as old as Person B was when Person A was as old as Person B is now.

41. ## Calculus

Harry has 3 sisters amd 5 brothers. His sister Harriet has a S sisters and B brothers. What is the product of S and B? (A) 8 (B) 10 (C) 12 (D) 15 (E) 18

42. ## mathematics 1

A metal plate containing 3/4 square foot of material is divided into six equal parts. how much material (in square feet) does each part contain?

43. ## mathematics 1

What is four-ninths of 81/144 square feet?

44. ## mathematics 1

A piece of wire 27/32 inch in length is cut into 3 equal pieces. how long is each piece?

45. ## algebra 2

write an expression that models the sum of your earnings for three weeks and Rich's earnings for two weeks if you each work (r) hours per week and Rich receives \$15 in tips per week. Simplify the expression.

What are the strategic,tactical and operational objectives for 1.Finance 2.Marketing 3.Production 4.Assets 5.Purchasing/ Stock 6.Housekeeping 7.Human Resources 8.Administration 9.Public Relations 10.Management That is when starting a business

47. ## science

select one region of the world and identify at least two serious environmental problems, such as soil degradation, air or water pollution, pesticide misuse, overpopulation, wildlife extinction or threatened biodiversity, and deforestation, that impact this

48. ## Earth Science

Do the Hawaiian islands appear to be the same age or are they older at one end of the chain or another?Explain. I know the islands aren't the same age but I don't know how to tell which end of the chain has older islands.

49. ## math

assign one number from 0,2,3,4,5,6,7,8,9 to each letter in PACIFIC, BALTIC and ARTIC so that PACIFIC + BALTIC + ARTIC = CCCCCCC. What is the value of PACIFIC

50. ## history

i am an eighth grader and i need help because we have to write about how there is a loyalist anda patriot and how they are arguing of why they should have a war and why they shouldnt and also why they should declare independence? but it has to include the

51. ## English

Hi, I have to write a poem in the style of Arthur Rimbaud's "Delirium II: Alchemy of the Word". Is there any websites that can help me with this? Any Tips? Thanks

52. ## Physics

For a question in physics... I was told to draw a graph of vertical displacement, y, versus time, t, in 2sec increments from 0 to 1.8. What was given to me was: v_yo_= +10m/s v_xo_= +5m/s a_y_ = -10m/s^2 So I used the formula: y=vo+1/2at^2 I drew the

53. ## Chem.

Why do metal oxides when dissolving in water make an alkaline solution? And Why non-metal oxides dissolve in water and become acids ? Is this a concept that has to be learned or is there a rule or a defintion for it

54. ## personal essay

i finished writing my intro and i'm working on writing my second paragraph in which i have to narrate my story as if i was telling it to another person. Here I go: For eight years, i was born and raised in India. My family and i lived in an four story

55. ## Calculus

Four red balls and two white balls are placed in a jar. One ball is randomly removed and replaced with a ball of the other color. The jar is then shaken, and one ball is randomly selected. What is the probability that this ball is red? Express your answer

56. ## history

What did Chinise people eat in the past?

57. ## Economics

IF income was transferred from individuals with a low MPC to those with a high MPC, aggregate demand would: a) Increase. b) Decrease. c) Stay the same. d) Increase or decrease, but not because of the MPC.

58. ## georgia studies

what word fits these: .one whose occupation is survaying land .association of persons for a common benifit . a public offficer of a town or township responsible for keeping peace .to wander in search of food . sonmething that serves as a protective barrier

59. ## Algrebra

How do I simplify this: -3(4y)

60. ## Algebra

3x-3x+x-3=2x-1+2x-1+2x

61. ## algebra question

240 is the sum of two numbers in which the larger number is 6 less than twice the smaller number what are the two numbers

62. ## Physics

X(t) = 5t^2 + 2t + 3 What are the units for 5? 2? 3?

63. ## Studying tips. . .

This is a kind of general question, but I was wondering if you have any tips on successful methods of studying. Also, reducing test anxiety. . . =S Thanks! ~Lucy

64. ## MAth

Solve... 2(10-y) = 30 I got 25... but don't think its right

65. ## math

what is c equal to 4(1.5c + 6) - 2c = -9

66. ## Physics

The acceleration due to gravity on the Moon is 1/6 of that of the Earth. Given the same initial velocity: How much higher will an object displace on the Moon? How much more time will it spend in the air?

67. ## math-geometry

a machinery belt runs around two wheels, crossing between them so that the larger wheel turns the smaller wheel in the opposite direction. the diametre of the larger wheel is 36cm, and the diametre of the smaller wheel is 24cm. What is the distance between

68. ## heat

A siler bar 0.125 meter long is subjected to a temperature change from 200 degrees celsius to 100 degrees celsius what willbe the length of the bar after the temperature change?

69. ## Physics

During the time interval of 15 to 20 secs. The graph goes from 10 m/s to 4 m/s , what is the average acceleration of that time interval.

70. ## Earth Science

Where are new volcanoes forming in Hawaii? I know the new volcanoe is Loihi but I'm not sure where it is forming.

71. ## Honoirs Algebra

Hello - I am afreshman & honors algebra is kicking my butt - I need to simplify the following (-6c)(2-3c) can some on help

72. ## english

how can miscommunication be effectively addressed or completely avoided?

73. ## Chemistry

Unfortunately I was hit by the sweep of illnesses going around due to changing whether and missed school today. Thus I missed the notes in Chemistry leaving me completely confuzzled about tonights homework on Dimmensional analysis or Unit Factoring. I

74. ## Algebra I

Hi: I am looking for confirmation that I have done this problem correctly: 6-(-5r)=5r-3 6+5r=5r-3 6+3+5r=5r-3+3 9+5r=5r 9+5r-5r=5r-5r 9=0

75. ## CALCULUS - need help!

Determine the limit of the trigonometric function (if it exists). 1. lim sin x / 5x (x -> 0) 2. lim tan^2x / x (x ->0) 3. lim cos x tan x / x (x -> 0)

76. ## Chemis.

Hi my qestion is in the non metal oxides there is one exception that is the oxide of hydrogen,What do we call this oxide ? WHat is its pH? Will it be acidic like most other non-metals reacting with water ?

77. ## science

-------------------a hypothesis organize the------------- state the---------------------the problem choose a ---------------- test your------------------ write the---------------------

78. ## Math repost for Andrea

math - Andrea, Monday, October 1, 2007 at 5:04pm how do yo use a protracter

79. ## english can someone help me please

i finished writing my intro and i'm working on writing my second paragraph in which i have to narrate my story as if i was telling it to another person. Here I go: For eight years, i was born and raised in India. My family and i lived in an four story

80. ## Social Studies

Compare the life of the Eastern Woodland Indians and the Southwest Indians.(food,homes,environment,clothes)

81. ## History

What do the people of INDIA EAT IN THE PAST

82. ## mathematics 1

How many cans each with a capacity of 3/8 gallons can be filled from 2 barrels of oil each containing 31 1/2 gallons?

83. ## mathematics 1

A line is 45/64 inch long. Find the length of a line 4/5 as long?

84. ## Math

1. I did it this way, but it doesn't check right 2(10-y)=30 _ _ 2 2 (10-y)=15 +10 +10 y = 25 Check: 2 (10-15) = 30 -30 is not equal to 30!!!

86. ## Alg. 1

A bridge in Japan is 7.6 miles long. How long would it take you to cross the bridge if you were walking at 4 mi/h?

87. ## sentence revision

As I was looking at the map on the screen and realized my destination of my new home was REACHING closer, the flight attendant’s announcement CAME on, “Ladies and gentlemen, we ask that you remain seated and fasten your seatbelt. We will be landing

88. ## Algebra

How do I work this correctly? I know the answer is 7 but I am doing something wrong.Here is what I have... x+ã(2x-5)=10 x+ã(2x-5)^2=10^2 x+2x-5=100 3x-5+5=100+5 3x=105 x=35 PLEASE HELP!

89. ## Science repost for Kelly

Science - Kelly, Monday, October 1, 2007 at 7:49pm In a grain of pollen, what is thefunction of the sperm cell that doesn't join with an egg call?

90. ## Math

What is the probability of rolling a six with a standard die, six times in a row?

91. ## Calculus

If a, b, and c are digits for which 7 a 2 -4 8 b ========= c 7 3 then a + b + b = _______ (A) 14 (B) 15 (C) 16 (D) 17 (E) 18

92. ## Psychology

What are the strengths of correlation research, observational/descriptive research, and experiments?

93. ## banking

two words: aehoumncrrusse

How do I write an expression? Example:John starts with 37 marbles. He gives one marble to all the kids on his ball team and one to each of his 2 brothers. Please explain how I do this.

95. ## Computer Science

Describe, in detail, the job of the operating system. Include the major jobs and secondary jobs that increase performance. How do utility programs support the OS? In addition, give examples of various operating software, citing advantages and disadvantages

96. ## SPANISH HELP HELP

To cirle the indirect object pronouns and draw an arrow to the indriect objects they stand for. Es muy divertido comprar regalos para mi familia y mis amigos. I circled regalos and drew the arrow to mi familia y mis amigos QUESTION: is regalos circled or

97. ## algebra question

What will it cost to tile a kitchen floor that is 12 feet wide by 20 feet long if the tile costs \$8.91 per square yard?

98. ## Geometry

Write an equation for the line with the given slpe that contains the given point. Graph each line. 1. slope 2,(2,-2)

99. ## Math

You have the #s o,2,3,4,5,6,7,8,9 and each number represents a letter in the oceans - PACIFIC, BALTIC, ARTIC. If you add up the numbers your answer is the seven Cs or c,ccc,ccc. What is the value of PACIFIC?

100. ## biology

can you provide a simple explanation of how a cell fires or synapses

101. ## science

What are compound and simple eyes?

102. ## Physical Science

Need to know how to measure mass on a balance ruler printed on worksheet. It's getting late... HELP :(

103. ## algebra 1

If you add one third of a number to the number itself, you get 48. What is the number? ~Is 64 correct?

Cash Flow and Profits: On-Line Retailer Temps Customers Statement; "Buy Now Pay 2008 - Why Wait? With absolutely nothing to pay until may 2008. our Buy Now Pay Later Plan is the perfect way to afford whatever you want - Today!" Question; Offering customers

105. ## spanish

To circle the indirect object pronouns and draw an arrow to the indriect objects they stand for. Es muy divertido comprar regalos para mi familia y mis amigos. I circled regalos and drew the arrow to mi familia y mis amigos QUESTION: is regalos circled or

w+16+2w=4

107. ## Math

Can you show me how to solve this problem? You have a die, what is the probability you will not get a six, six times in a row?

108. ## math

What is the probability of a die not coming up six, six times in a row? How do I solve that problem?

109. ## AP Lit (Help)

Think about the role of the money in a raisin in the sun how does affect each of the major characters? is abook called a raisin in the sun by Lorraine hansberry

110. ## spanish

To circle the indirect object pronouns and draw an arrow to the indirect objects they stand for. Es muy divertido comprar regalos para mi familia y mis amigos. I circled regalos and drew the arrow to mi familia y mis amigos QUESTION: is regalos circled or

Rounding to the greatest number Question 21+34=

112. ## Social Studies

Who settled Delaware?

113. ## Algebra 1

HOW DO U SOLVE TWO STEP EQUATIONS????

114. ## social studies

what are the two areas of the radical republicans help independent black people

115. ## Essay

I have written the first three paragrapsh of my essay. I was wondering if anybody wanted to edit it for grammar and stuff. Thanks. Famous Firsts Every person lives a life that is different from all others. In this life we each experience something for the

116. ## History

what do China's people eat in the past

117. ## English

Im reading the story"white tigers" in the book warrior women and i don't know what this quote means" When i get hungary enough, then the killing and falling are dancing too."

118. ## Math

What is part and total number stories? 3rd grade

119. ## A.P. U.S. History

What role did George Washington play in the 1750’s?

120. ## math

write an expression to show 19

121. ## Science

What are societal laws?

122. ## english

Why did Ratcliffe replace the original president?

123. ## Calculus

If 2 to the 1998 power - 2 to the 1997 power - 2 to the 1996 power + 2 to the 1995 power = k times 2 to the 1995 power, what is the value of k? (A) 1 (B) 2 (C) 3 (D) 4 (E) 5

124. ## Science

what does deposition mean?

125. ## Calculus

If a, b, and c are digits for which 7 a 2 -4 8 b =========

126. ## Calculus

If a, b, and c are digits for which 7 a 2 -4 8 b =========

127. ## geography

after britain sent troops to boston to stop resistance to the townsedn acts, tensions exploded in the boston massacre of 1770 what was the effect?

128. ## U.S. History

What types of changes were occurring in terms of education, law and politics in the American colonies in the 1700’s?

129. ## geography

what do you see on the surface of the earth?

130. ## educational technology

what is the difference between a pamphlets, a brochure and a leaflets??? please cite an example for each (an image)...thanks a lot...

131. ## Econ

How's the Federal Budget Deficit related to trade imbalances?

132. ## Math

How to distribute 25-29(t-50)=19 and solve

133. ## science

how much water does the usa use yearly

134. ## Pre-Calculus

How do I find f(g(x)) when there is a radical?

135. ## biology

can you provide an explanation on how a "muscle tone" reflex happens?

136. ## algebra 1

The sum of a number and 2/5 (two fifths) of itself is 56. What is the number? HOW IN THE HECK AM I SUPPOSED TO SET UP THIS EQUATION? PLEASE HELP... I AM DESPERATE!

137. ## mathematics 1

how long is 2/5 of 15/16inch?

138. ## French

How do you say "we watched the sunset" in French? Is it "nous avons regardé le coucher du soleil?" Merci!

139. ## math

How do you graph polynomials?

140. ## science

What are 4 basic needs of every organism

141. ## ALGEBRA 1

How would you go about setting up the following word problem? If you add one third of a number to the number itself, you get 48. What is the number?

8m-15-7m=5

143. ## math

HELP!!! How do I solve the following: 3h + 2 for h =10

144. ## algebra

4x-7=x+8 4w-19=w+2 8m-90=75-7m 3(2m-5)=9 4w+2(w-5) 5(2x+8)=6x+32

145. ## math

how d you turn the roman numeral number DCCXXXI into a regular number?

146. ## math

how d you turn the roman numeral number DCCXXXI into a regular number?

147. ## Math

how do you simplify and combine like terms for this 4(x+5)+3x squared+6(x+1)

148. ## Economics

An increase in the price of a good A.increases the opportunity cost of consuming the good. B. decreases the opportunity cost of conusming the good. C. does not effect the oppurtunity cost of consuming the good. D. increases the opportunity cost of other

149. ## Calculus

When Rachel divides her favorite number by 7, she gets a remainder of 5. What will the remainder be if she multiplies her favorite number by 5 and then divides by 7?

150. ## Mathematics 1

Find the L.C.D. of each of the following groups of fractions and then express the fractions of each group in terms of the L.C.D. of the group. 1/3, 3/5, 21/25, 13/15

151. ## Social Studies

Who settled Massachusetts?

152. ## Social Studies

Who settled Rhode Island?

153. ## Social Studies

Who settled Connecticut?

154. ## Social Studies

Who settled New Jersey?

155. ## Social Studies

Who settled Maryland?