1. Physics

The driver accelerates a 240.0 kg snowmobile, which results in a force being exerted that speeds up the snowmobile from 6.00 m/s to 28.0 m/s over a time interval of 60.0 s. b. What is the snowmobile's change in momentum? What is the impulse on the

2. Physics

A race driver has made a pit stop to refuel. After refueling, he leaves the pit area with an acceleration whose magnitude is 6.0m/s 2 . After 4.0s he enters the main speedway. At the same instant, another car on the speedway and traveling at a constant

3. Science

An occupant of a car has a chance of surviving a crash if the deceleration during the crash is not more than 30 g. Calculate the force on a 70 kg person deceleerating at the same rate.

4. gr.11 physics help!

When an iceberg floats in the ocean, what fraction of it is visible?( The relative density of ice is 0.92, and the relative density of sea water is 1.03)

5. Math

What is the probability if getting an odd number when rolling a 6 sided die?

6. Physics

A cube of oak with sides 15cm long floats upright in water with 10.5cm of its depth submerged. What is the density of the oak?

8. Social Studies

How social studies in your particular school setting relates to the definition of social studies

9. Math Analysis

What is the apparent size of an object 1 cm long held 80 cm from your eyes? ==> When they say "apparent size", they mean the angle from which one object is viewed by, say, a person (or in this case a pair of eyes). I thought I'd be able to find the angle

10. Math

If a ball is throw into the air with a velocity of 40ft/s its height in feet t seconds later is given by: y=40t-16t^2. Find the average velocity for the time period beginning when t=2 and lasting 0.5 seconds.

11. physics

A diffraction grating gives a second-order maximum at as angle of 31‹ for violet light (ƒÉ = 4.0 ~ 102 nm). If the diffraction grating is 1.0 cm in width, how many lines are on this diffraction grating?

12. PHYSICS

super easy (I think) but I must be missing some concept... A race car starts from rest on a circular track. The car increases its speed at a constant rate at as it goes 5.00 times around the track. Find the angle that the total acceleration of the car

s8impliy this exponential expression): -2 7 -8 ) 6 -9)8 (7) * (x) * (w * (x *(4) * -3) (w

14. Chemisty

How to calculate the theoretical yield of aspirin to be obtained when 2.0 g of salicylic acid and 5.0 mL of acetic anhydride (density = 1.08 g/mL) are mixed together? ( Molar masses: acetic anhydride = 102.1 g/mol; salicylic acid = 138.2 g/mol)

15. Environmental science

can someone help me on this question please: 27. The tundra is most suitable to a vertebrate that a. requires nesting sites in tall trees b. is cold blooded c. has a green outer skin for camouflage d. can migrate hundreds of kilometers each summer i've

16. geometry

a 10-inch-long board is cut into two pieces that have lengths in the ratio 2:7. What is the length of each new piece?

17. Chemistry

I need some help finding the net ionic equation for these two problems: 1. Bromine is added to a dilute solution of sodium hydroxide. 2. Sulfuric acid is added to a solution of lithium hydrogen carbonate. This is what I have for reactants: Br2 + NaOH and

18. math

prove: 2sinx+sin2x = 2sin^3(x)/1-cosx

19. History

One of the significant changes in atmosphere in Jefferson's administration was: 1. The number of common people involved in government. 2. The closing of the bank of the united states. 3. the widespread dismissal of federalist officeholders. 4. The

20. math

write 3 different ones numbers you could add to 15 without needing to regroup. write 3 different ones numbers you could add to 15 where you need to regroup to find the sum.

21. Chemical Equations

How do you balance Ca(OH)2 + HNO3 = Ca(NO3)2 + H2O

22. Biology

What differences would you expect to see in a population made up of individuals whose chromosomes experience crossing-over frequently compared with a population made up of individuals whose chromosomes do not cross over?

23. physics

Would you see the same thin film interference pattern in a film of soap surrounded by air and a film of soap on glass? Why or why not?

24. Physics

Please help ! Finish the following statement: "The greater the number of lines on a diffraction grating of a given size," a)the greater b)smaller then a)the range of wavelengths that can be diffracted b)the distance between the bright fringes produced

25. Literature

5. All of the following words are archaic except a. coz b. God-den c. halt d. ope I'm stuck between a and d? Thanks -MC

26. algebra

Paula leaves home driving 40 miles/hr. One hour later Dan leaves home driving in the same direction at the rate of 50 miles/hr. How long will it take dan to catch up with Paula?

27. Science

What two sources of friction do you have to overcome when you are walking?

28. Physics

A droplet of ink in an industrial ink jet printer carries a charge of 1.6 x 10 to the power of -10C and is deflected onto paper by a force of 3.2 x 10 to the power of -4N. What is the strength of the electric field to produce this force?

29. O chem

When 2-methyl-2-butene is bubbled into dilute sulfuric acid at room temperature, it appears to dissolve. What new substance has been formed?

30. To All Students & Tutors

I will not be able to answer any questions on this board for the next 8 days or so. I will be warming my weary bones down south off one of the islands of Belize for a while. Great time to get away as the temperature up my way is currently at -12 C. Reiny

31. physics

To start an avalanche on a mountain slope, an artillery shell is fired with an initial velocity of 340 m/s at 45.0° above the horizontal. It explodes on the mountainside 41.0 s after firing. What are the x and y coordinates of the shell where it explodes,

32. physics

A diffraction grating gives a second-order maximum at as angle of 31‹ for violet light (ƒÉ = 4.0 ~ 102 nm). If the diffraction grating is 1.0 cm in width, how many lines are on this diffraction grating?

33. Physics

If I wanted to right SIGMA F = ma in the proper notation what would I put above and below SIGMA Would I put a lower case "n" above SIGMA and "i = 0" below it and then put a subscript "i" under the "F" thank you I have been woundering about this as it makes

34. physics

A bag of cement of weight 300 N hangs from three wires. Two of the wires make angles θ1 = 50.0° and θ2 = 28.0° with the horizontal. Assuming the system is in equilibrium, find the tensions in the wires.

35. physics

a person carries a 58kg package of books up a flight of stairs the length along the stairs is 24 meters the vertical height of the stairs is 12 meters how much work is done in raising the package I know the answer is 6800 J but how to get????

36. Algebra

I am lost, and I bet it is simple, but I have been working with many problems and I keep coming back to this and I grow increasingly confused. How do I begin to solve this problem? In 1993 the life expectancy of males in a certain country was 71.7 years.

37. physics

Would you see the same thin film interference pattern in a film of soap surrounded by air and a film of soap on glass? Why or why not?

38. Literature

I need help figuring out the exposition, complications, climax, and resolution of The Miracle Worker. I think some complications were when the Kellers weren't letting Annie do her job because they were pitying Helen too much? Or Helen wasn't cooperating? I

39. Algebra

I have a few problems I need you to take a look at and tell me if I arrived at the right answer. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1), (-6,

40. math

find equivalent fractions with a common denominator and order from least to greatest. Pls. explain. ty 2/3, 1/2, 5/12

One purpose of a summary is to 1. save the reader time 2. correct errors in the original 3. change technical terms to everyday language 4. include your opinion on the topic

42. health psychology

Imagine you are witnessing a senate debate in Washington, D.C., hours before a vote on a comprehensive health care reform proposal. A significant number of senators are open to the idea, but are unconvinced to support full integration of health

43. physics

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 14 m/s. The cliff is h = 39 m above the water's surface. (a) How long does it take for the stone to fall to the water? (b) With what speed does it strike the

44. English- Juluis Caesar

I'm suppose to write approximately 100 words or half a page for each of these questions & I need a little bit of help! :S Question 1: After reading Act 1, Do you believe that Caesar might, indeed, be a threat to Roman Liberty? Question 2: After reading Act

45. Algebra/math

I have a few problems I need you to take a look at and tell me if I arrived at the right answer. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1), (-6,

46. Literature

I still need help finding the exposition and resolution of The Miracle Worker. I already know the definition of the two, but I can't find where the characters are all introduced in the play. And I'm not sure what to write about the resolution because it

47. Physics

a plastic duck floats half-immersedi n water in the bathtub. What fraction of its volume would be immersed in a liquid of relative density 2.0?

48. algebra

the units digit of a 2-digit number exceeds twice the tens digit by 1. find the number if the sum of its digits is 10. Please help i am completley lost!!

49. French

Original Poem-Formula Poetry line one = a noun line two = 2 adjs. that describe the noun line three = a sentence describing noun. line four = another word that has the same meaning as noun. Could I have an example on this please.

50. Trig

We started a new lesson on Monday on identities. Our test is tommorrow. I have no idea of what I'm doing! Can somebody help me study?

51. math

last year Jodie invested \$10000, part at 6% anual intrest and the rest at 8% annual intrest. if she received \$760 in intrest at the end of the year how much did she invest at each rate. help is much appreciated plz help!!

52. pre algebra

what is 5(2x-3)+8=9

53. Math

I am lost, and I bet it is simple, but I have been working with many problems and I keep coming back to this and I grow increasingly confused. How do I begin to solve this problem? In 1993 the life expectancy of males in a certain country was 71.7 years.

54. psychology

The scientific method is very important to psychology. What other disciplines can you envision making practical use of the scientific method? Is is used at all at your workplace?

55. History

Washington's main objective as president of the united states was to: (1) set up a court similar to that of Eurpoean monarchs. (2) establish respect for the office of presidency. (3) keep peace between the northern and southern states. (4) maintain his

56. math

-w-z=-2 and 4w+5z=16 im trying to solve this equation by using subsitution

57. financial

Explain the effect of inefficient inventory management on the liquidity and profitability of the firm

I'm doing this word search for my 9th grade honors physical science class, and i don't understand one thing. it says 'blue, striped and round are examples of this' when we're talking about matter and phases of matter and density/mass/weight/volume. stuff

59. AP Math

Solve: log2(2x^2)[log2(16x)]= 9/2log2x

60. geometry

the measure of two sides of a triangle are 15 and 18. Between what two numbers must the measure of the third side fall?

61. Algebra

Need some Homework help for my son and I am not doing so great figuring out the correct answer- all explanations a greatly appreciated..... he has the following 3 part word problem. Josh mows lawns after school and earns \$25 for each lawn mowed. 1. write a

62. math

State whether or not each figure has rotational symmetry. a) scalene triangle b) equilateral triangle c) rectangle d) square e) regular hexagon

63. math

of a^2+b^2=2ab, prove log[(a+b)/2]=1/2(loga+logb)

64. PHYSICS

a 17 of model plane is flying at a horizontal speed of 14 m/s the plane goes into a dive and levels off 21 m closer to the earth what was the ammount of potentiomal energy lost in the dive

65. gr.7 math

State whether or not each figure has rotational symmetry. a) scalene triangle b) equilateral triangle c) rectangle d) square e) regular hexagon

66. ela

i am going to put test 1 than test 2for my drawing. i just need one more example. THAKYOU !

Find 3 uppercase letters that look the same when rotated 180 degrees.Then,what letter's 90,180,270 degree rotations has this outline?This is also the inside lines formed by the rotation of what letter?

68. CP Algebra

Simplifying fractions. I can get from this: 4b^2-5b-6 __________ 8b^2 + 6b To this: (4b+3)(b-2) ___________ 2b(4b+3b) Not sure from there.

69. physics

Nate is 165 cm tall, 40 cm wide, and weighs 710 N. He needs to walk ten blocks (1000 m) against a 50 km/h head-wind. Nate pushes on the ground with the minimum force that allows him to move slowly forward at a constant speed, and against the drag from the

70. math

Solve for x: sin3x=1/2 Can someone please help me with this porblem? I'm not sure if my answers are right, but I obtained x=ð+12ðk/18 and x=5ð+12ðk/18.

How does the latitude of the sun Parlour compare to California?

72. chemistry

Did the equation do not know the 2nd questions"s answers for the problems a) 2O3(g) = 3 O2(g) + heat (O3 IS UNDERLINED) [6.0x10-1] [0.21] b) 2 CO2 (g) + heat = 2 CO(g) +O2(g) (CO IS UNDERLINED) [0.103] [0.024] [1.18 x10-2] c) NO2(g) + O2(g) + heat =NO (g)

73. algebra

pleae help solve: 3x-5y=7 and 5x-2y=-1

74. history

OGT question List what you believe are the 5 most important effects of industrialization and explain why you chose those five.

75. English

Can you check these two sentences for me? 1) he dreamed of equality of all people 2) he fought against evil 3) the Black Power Movement was more militant (OR a more militant group?) 4) A homowork agency does his homework in Paul's place (instead of for

76. chemisty

how many grams of KCL are there in 1200 ml of a 2% KCI solution

77. world history

How did the Reformation in Great Britain affect the colonization of the New World? Explain.

78. latin

I am stuck on translating the below from Latin to Englis: Impluvium in illo atrio erat novem pedes latum. Multos dies ad montes iter fecimus. Any help on those two would be greatly appreciated.

79. Math

I am supposed to find five ordered pairs to make the equation true y = 20 + x/3 so far I have (0,20) and (6,22) is this right? I am unsure because my text example had x^2 + 3x = y (0,0) (1,4) (2,10) (3,18) (4,28) and they have a common theme (muliply by by

80. HCA

What can be considered the most problomatic factor that influences patient communication? Fow the most substantial I chose listening skills. I just need a lead, I am having trouble coming up with a problomatic factor.. I will elaborate on it once I find

81. English

i need this journal entry edited please? I Want It Undone Journal Entry: What I did to Jack should be unforgivable. Today I might have ruined Jack’s entire high school life. Part way through period one class, I asked to go use the washroom. I went to the

82. ela small project

we have small project. i am confused what picture to draw for consider the options. our chapter name is face the challenges ( on stress). i have statement for that but i do not know what type of picture to draw. can you give some example.

83. English

In the Crucible, At what point does Abigail first begin feeling cold? What effect does this event have on Danforth? What does it suggest about her motives?

84. marketing

: You are working in the product development department of a company that creates household products. Your team has come up with an idea for a revolutionary new cleaning product. Using the seven phases of new product development as a guide, describe how

85. algebra

Bob bought a fax machine for \$750. The fax depreciates at the rate of \$25 a month. Find a function "F" that can be determine the value of the fax machine t months after the purchase. Complete the model: F(t)=

86. Math

I am supposed to find five ordered pairs to make the equation true y = 20 + x/3 so far I have (0,20) and (6,22) is this right? I am unsure because my text example had x^2 + 3x = y (0,0) (1,4) (2,10) (3,18) (4,28) and they have a common theme (muliply by by

87. physics

A ball attached to the end of a string is whirled on a horizontal circle at constant speed. Consider the linear momentum, total energy, and kinetic energy of the ball throughout its motion. Which of the following statements is true? Both linear momentum

What is the prime factorization of 1,050

89. Math

2x+5y=16 5x-2y=11 Please help me solve this system of equations!! I keep getting no solution and i do not know what I am doing wrong.

what is angle of rotation?

91. Spanish

I'm curious to know if i translated these two sentences right: 1.The stop sign is located at the intersection. ~I translated: La senal de parada esta queda al cruce de calles. 2.It is very dangerous to drive a truck across the narrow bridge. ~I translated:

92. Social Studies

What is the definition of cowhead? I can't find it anywhere! (this word is in my social studies text book)

93. algebra

Find the length of the hypotenuse of a right triangle whose legs are 8 and 15 units in length.

94. SHAKESPEARE

"Translate" the prologue to Romeo and Juliet from Shakespeare's poetry to your prose. Use the dictionary as necessary. Two households, both alike in dignity, In fair Verona, where we lay our scene, From ancient grudge break to new mutiny, Where civil blood

95. chemistry

calculate the heat energy required to raise the temperature of a 500 gram iron pipe from 25 degrees celcius to 100 degrees celcius

96. government

do you think locke would have supported the colonists actions in the boston tea part? why or why not?

97. english

I’ve to compare and contrast “Self-Reliance” by Emerson and “The Narrative of the Life of Frederick Douglass” by Frederick Douglass. I know that both writers share the idea that each individual should create their own identity and follow what

98. Geometry

Can someone explain inscribed circles to me? I do not understand whatsoever.

99. Physics

If I wanted to right SIGMA F = ma in the proper notation what would I put above and below SIGMA Would I put a lower case "n" above SIGMA and "i = 0" below it and then put a subscript "i" under the "F" thank you I have been woundering about this as it makes

100. math

if a gift is 42.40 including tax,what is the retail price for the gift if the sales tax is 6% ??

what is interpersonal" communication

102. Math

If a company pays \$4.90 dividend at the end of the year, and the stock price is \$70, and the growth rate is 6% can you tell me what the required rate of return would be using the dividend yield and growth rate (capital gains)?

103. algebra

write equivalent expression using radical notation (a^2b^2)^1/3

104. Math Help

Hunter gave his sister \$3. He earned \$12, then he paid \$6 for lunch. Now Hunter has \$18. How much money did Hunter have to start with? I'm confused. Please help.

105. History

1.What impact did Thomas Paine’s writing of “Common Sense” have on gaining support for the American’s cause? 2.What is the significance of the “signing” of the Declaration of Independence by members of the Continental Congress?

106. AP World History

How can I show Change and Continuity in the American Environment between 600 AD - 1750 AD?

Did Mr. Smooth-it-away in The Celestial Raidroad decieve someone?

108. Geometery

I need to know the laws of triangle inequality. i need help what is triangle in equality?

109. Calculus

Find the instantaneous rate of change of the volume V=(1/3) pi r^2 H (all put together) of a cone with respect to the radius r at r=a if the height H does not change. I truly appreciate all of ya'll help! Thanks!

110. chemistry

What is the smallest volume of water at 20c that could be used to dissolve and remove potassium nitrate impurities and leave pure sodium hydrogen carbonate?

111. AP Statistics

if the probability of a swan drowning is .27, find the probability of exactly 4 out of the 7 swans drowning.

112. AP Statistics

if the probability of a dribbling drummer is .38, find the standard deviation of the dribbling drummers drumming for the twelve drummers drumming

113. algebra

In which direction does the parabola that is given by the equation below open? y = -4.5(x - 6)2 + 1

114. human resource

Explain if the internet has helped or hindered the recruitment process? why or why not?

115. algebra

If the lenght of a rectangle is 15 inches longer than its width whats an equation to represent the area of the rectangle?

116. science

why eating carrots is important for good vision?

117. French

1.Est-ce que tu travailles dans une boutique, un magasin ou un grand magasin? 1.Je ne travaille pas n'importe où pour le moment. 2.Est-ce que tu aimes acheter des vêtements? 2.Oui, j'aime acheter des vêtements. 3.Qu'est-ce que tu cherches quand tu vas

118. HIS125

what are some social, economic and political changes that played a role in the changing, vibrant city culture? How would they be significant to growth and change in the country as a whole??

119. SCIENCE helppp!!

Our sun is what scientists call a "yellow-green star." Does it emit energy in the frequency of red light? I have no idea!

120. physics

find time it takes for a sprinter to accelerate from rest to 10 m/s. If acceleration is 4.0 m/s sq.

121. ela

ms sue you did not told me these two 1. white board with a word misspelled in a couple of ways -- and finally the right way. . rowing away from a sinking ship

122. Algebra

how would you change Y=-2/3x-12 into simplified form? (Ax+By=C)

124. math

2/9x26 by using estimating product

125. Math

If you lay in the hot sun for 4 hours, you will become sunburned. Nicole is not sunburned. Therefore.... My answer is therefor she did not stay in the sun longer than 4 hours.... I am not sure and I don't understand the full question

126. English

Can you check the mistakes in the following sentences? 1) The American Civil Rights Movement was a fight organised by M.L.King (was a non-violent organisation led by M..???) 2) It was different from the Black P Movement because the first (better the

127. Social Studies

Which areas of the social studies definition are underrepresented in schools today?

Some argue that translation gains or loses are not important so long as they have not been realized and are only accounting entries. what is the other side of that argument?

129. French

1.Est-ce que tu travailles dans une boutique, un magasin ou un grand magasin? 1.Je ne travaille pas n'importe où pour le moment. 2.Est-ce que tu aimes acheter des vêtements? 2.Oui, j'aime acheter des vêtements. 3.Qu'est-ce que tu cherches quand tu vas

what is 1/7 5/6 1/42 11/42 in greatest to least

131. voting

What are 3 pieces of information requested on a PA voter registration card? Name the 5 positions that comprise(or make up) an Election Board.

132. US History

I'm really confused about this. My history textbook said that during reconstruction, Southern states were ordered to hold conventions which would "repudiate Southern debts." It doesn't make sense that the US federal government would tell confederate states

133. English

1) At first he lowered his friend on his rope down the mountain (is it correct to use lower) but as his friend was pulling him off the mountain he decided to cut the rope. 2) He decided to cut the rope so as not to fall off the mountain (is "so as not"

134. science

a concave mirror is also called a converging mirror. explain why

if I know the volume of something how do I find out what the length width and height are?

136. computers

why is it recommended to establish a formal evaluation criterion when considering the purchase of hardware for the organization.

137. Math

Unscramble Ceirhaplcrg

why?

139. math

Claire's old aquarium has a volume of 27,000cm3. She bought a new aquarium in which the length and width are 5 times those of her old tank. What is the volume of Claire's new aquarium?

140. Math

choose 5, 10, 100 as the most reasonable interval for 5,16,20,11,15

141. English

Can you check these sentences for me? 1) They search to not throw away so manu plastic bags (they try not to throw so many .... away??) 2)He enjoyed not having a conscience (he enjoyed having no conscience) 3)he couldn't keep in control that situation

what is the trade first method,i know the counting up method but don't what they mean by the trade first method

143. Biology

In general, the frequency of APs in an afferent neuron is related to the amplitude of the receptor potential in the following way: a. exponentially. b. there is no general relationship. c. logarithmically. d. linearly. Is it exponentially? The other

144. algebra 2

p^5 p^-4 z^2 divided by z^-5 zp^3 -21a^2 b^8 divided by -18a^-4 b^10 (2kr^3)^-3 divided by 4k^-2 r^6

145. geometry

what is the name of a figure that has 2 sides that measure 25ft. each and 2 sides that measure 10ft. each

146. Speech

I am doing a speech on how to put on a shoe. Minimum speech time : 2 Minutes. How can i make this work ?

147. ela small project

Do you have more example please

where can i find the answers to a book i read ? The book is shark girl.

149. algebra

what does this mean in algebra? upsidedown v

150. Criminal justice

Do you think involvement by a prosecutor in the original stages of an investigation is a good idea?

151. ela project

i have two: 1. If the first resolution does not give results try once again 2. Errors are a source of experience

152. math

if wayne completed a task in one hour and sarah completed a task in two hours, how long will they take if they work together?

153. Riddle

The man who made it sold it.. the man who bought it never used it.. and the man who used it never saw it and he was not blind?

154. biology

why eating carrots is important for good vision?

155. science

where do electrons float

156. ela project

i did not uderstand "two simple numbers "

157. spelling

whirldwind:breeze:: downpour:

158. ela project

thankyou for giving me an example. but need 2 or 3. can you give some more? please

160. algebra

how do you do 4{n+3} --------= n-3 5

161. ela project

i made one make a box than put option number one than put X ( wrong)

162. math

what is 1/5x24 by using estimating product

163. math

4/7x20 by using estimating product

164. math

5/8x19 by using estimating product

165. math

3/8x17 by using estimating product

166. phys

What is the minimum lens size (in meters) that will permit just resolving 2 stars 1.1 second apart using light of 510nm?

167. math

1/5x26 by using estimating product

SOLVE THIS EQUATION 3N+2=? n is 2

169. pre algebra

a porcupine has a mass of 27kg. a cat has a mass of 6,300 k. which animal has the greater mass

170. math

1/2x17 by using estimating product

171. math

3/7x29 by using estimating product

172. math

2/9x26 by using estimating product

173. math

5/8x41 by using estimating product

174. math

7/8x30 by using estimating product

175. math

3/4x35 by using estimating product

176. math

2/3x35 by using estimating product

177. math

6/11x32 by using estimating product

178. math

estimate 4/5of 49

179. health

Mary was receiving Medicaid in Texas. When she moves to California, can Mary assume that she’ll receive the same coverage there?

180. cooking class

what's a violet betsey an this is for a foods class so food relatted please

181. algebra

How do you do standard form

182. Accounting

what are the different types of accounting budgets?

183. chemistry

what is the Symbols and Names of Common Metal Ions with More than One Ionic Charge of CuSO4

184. chemistry

i have difficulty in this question. any help would be appreciated. 1) What pH corresponds to each of the following: (a) (H+)=0.35M,(b)(OH^-)= 6.0*10^-6M. (d)(H+)= 2.5*10^-8M?

185. chemistry

i need help with this question. What pH corresponds to each of the following: (a) (H-)=7.3*10^-5M, (b)(H+)=0.084M,(c)(OH-)= 3.3*10^-4M, (d) (OH-)= 0.042M? Thank you.

186. math

I have no idea how to do these please help(: evaluate each of the following 1. 81^-1/4 (81 to the negative power of one fourth) 2. 125^2/3 3. 64^-3/2 4. 4^3/2 answers and work please

187. chemistry

i need help with this question. any help would be appreciated. 1) What concentration Of H^+(aq) corresponds to each of the following:(a)pH=3.33,(b)pOH=3.33,(c) pH=6.78,(d)pOH=11.11?

188. math

I have no idea how to do these please help(: evaluate each of the following 1. 81^-1/4 (81 to the negative power of one fourth) 2. 125^2/3 3. 64^-3/2 4. 4^3/2 answers and work please

189. social studies

Between 1935 and 1957, a period that included World War II, the birth rate rose from 16.9 to 25 per 1000 people. What was the most likely cause of this "baby boom?"

Draw a diagram that can be used to explain sea-loor spreading. Label your diagram.

192. social studies

without our two great political parties cutting across economic and goegraphic intrests, democracy as we know it could never have been made to function. the author of this statement probably meant to suggest what?

193. math

5cars 3 balls 2 fish How many more children like cars than fish 5 cars 3 balls 2 fish How many few children like fish than balls

194. chemistry

Q.1Explain why CH3COOH2^+ is in terms of protonic concept? Q.2 0.1 mole HCl is dissolved in distilled water of volume V then at a limit V =infinite pH of the solution is equal to______? Q.3One litre of water contains 10^-5 moles of H^+ ions at 25 degree

195. algebra

Which is greater? 7 3/4 or 7 2/3