# Questions Asked onOctober 31, 2011

1. ## Calculus 1

A fence is to be built to enclose a rectangular area of 220 square feet. The fence along three sides is to be made of material that costs 6 dollars per foot, and the material for the fourth side costs 13 dollars per foot. Find the dimensions of the

2. ## calculus II SURFACE AREA Integration

Find the exact area of the surface obtained by rotating the curve about the x-axis. y = sqrt(1 + 5x) from 1 ≤ x ≤ 7

3. ## Chemistry

(a) Calculate the molarity of a solution that contains 0.175 mol ZnCl2 in exactly 150 mL of solution. (b) How many moles of HCl are present in 35.0 mL of a 4.50 M solution of nitric acid? (c) How many milliliters of 6.00 MNaOH solution are needed to

4. ## physics

Why does tee fly backwards after teeoff?

5. ## MATH

a pile of bricks has 85 bricks in the bottom row, 79 bricks in the second row, 73 in the third row, and so on until there is only 1 brick in the top row. how many bricks are in the 12th row? how many rows are there in all?

Give equations to show how sulfuric acid can convert 4-methylcyclohexene into a mixture of four isomeric c7H12 compounds(including starting material). Predict the relative amounts of each isomer.

7. ## Chemistry

a chemical engineer placed 1.520 g of a hydorcarbon in the bomb of a calorimeter. The bomb was immersed in 2.550 L of water and the sample was burned. The water temperature rose from 20.00C to 23.55C. If the calorimeter (excluding the water) had a heat

8. ## chemistry

calculate the molarity of acetic acid in a vinegar sample,knowing that 5.00ml of vinegar requires 43.50ml of 0.105 M NaOH to just reach the phenolphthalein endpoint in a titration

9. ## chemistry

what is the molarity of a solution prepared by dissolving 2.24 grams of NaOH in enough deionized water to obtain 500.0ml of solution?The molar mass of NaOH is 40.0g

10. ## physics

A 28.0 block is connected to an empty 2.20 bucket by a cord running over a frictionless pulley. The coefficient of static friction between the table and the block is 0.44 and the coefficient of kinetic friction between the table and the block is 0.35. Sand

11. ## chemistry

Use Equation 7.1 and assuming that core electrons contribute 1.00 and valence electrons contribute nothing to the screening constant, S, calculate Zeff} for these two ions. Express your answers as integers. Enter your answers numerically separated by a

12. ## Chemistry

Hydrogen sulfide is an impurity in natural gas that must be removed. One common removal method is called the Claus process, which relies on the reaction: 8 H2S(g) + 4 O2(g)--> S(l) + 8 H2O(g) Under optimal conditions the Claus process gives 98% yield of S8

13. ## Chemistry

An aqueous solution of an unknown solute is tested with litmus paper and found to be acidic. The solution is weakly conducting compared with a solution of NaCl of the same concentration. Which of the following substances could the unknown be: KOH,NH3,HNO3,

14. ## MATH CHALLEGE

I am playing a dice game with my friend Kyle. Each of us roles a standard six-side die obtaining a number at random from 1 to 6. What is the probability that my number is greater than Kyle’s number?

15. ## science

Chemical formula : C12,H22,O11 How many carbon atoms are in 1 molecule of sugar? How many hydrogen atoms are in 1 molecule of sugar? How many oxygen molecules are in 1 molecule of sugar?

16. ## statistics

Consider a 90% confidence interval for μ. Assume σ is not known. For which sample size n=10 or n=20, is the confidence interval longer?

17. ## math

a car travels at a constants speed and uses G(x) litres of gas per kilomotre, where x is the speed of the car in kilomotres oer hour and G(x)=(1280+x^2)/(320x) a>if fuel costs 1.29 per litre, determine the cost function C(x)that expresses the cost of the

18. ## Physics

A vehicle is travelling at 25.0 m/s. It brakes provide an acceleration of -3.75 m/s^2[forward]. What is the driver's maximum reaction time if she is to avoid hitting an obstacle 95.0 m away? the answer is a number less than 0.5 second. can you tell me the

19. ## Calculus 1 Newton's Method

Using Newton's method, approximate the root of the equation x^3+x+2=0 with the initial guess x1=-1 gives: x2=? and x3=? answers are not 0 or -1

20. ## chemistry

Determine the structure of the compound by using the IR and 1H NMR of a spectra that has the molecular formula: C4H8O2

21. ## math

If y(x-1)=z then X =

22. ## science

what do all animals have in common?

23. ## calculus

find the centroid of the plane region bounded by the curves y = cos x, y=sinx, x=0,

24. ## geometry

if angle C of a parallelogram measures 65 degrees, what is the measure of angle D

25. ## physics

to push a 25 kg crate up a 27 incline, a worker exerts a force of 120 N, parallel to the incline. As the crate slides 3.6 m, how much work is done on the crate by a) the worker b) force of gravity c) normal force

26. ## Finance

Farmer Tom Hedges anticipates taking 100,000 bushels of oats to the market in three months. The current cash price for oats is \$2.15. He can sell a three- month futures contract for oats at \$2.20. He decides to sell 10 5,000-bushel futures contracts at

27. ## Statistics

Please help!! I have no idea how to do this question. 14. A sample of 40 CD’s from your collection showed a mean length of 52.74 minutes with a standard deviation of 13.21 minutes a. Construct the 95 percent confidence interval for the mean. b. Construct

28. ## Chemistry

Which of the following solutions is the most basic? (a) 0.6 M NH3, (b) 0.150 M KOH, (c) 0.100 M Ba(OH)2. Explain.

29. ## Chemistry

A person suffering from hyponatremia has a sodium ion concentration in the blood of 0.118 Mand a total blood volume of 4.6 L.What mass of sodium chloride would need to be added to the blood to bring the sodium ion concentration up to 0.138 M, assuming no

30. ## PHYSICS HELP!!!!!

A 7.0 g bullet is fired horizontally into a 1.5 kg block of wood suspended by a thread. The bullet emerges from the block with a speed of 195 m/s, and the block rises to a maximum height of 12 cm. Find the initial speed of the bullet.

31. ## Statistics

The distribution of heights of adult males has a mean of 69 inches and a standard deviation of 4 inches. A random sample of 36 adult males is selected. Find the probability that the average height will be more than 70 inches. a.0.668 b.0.858 c.0.908

32. ## organic chemistry

Determine the structure of the compound by using the IR and 1H NMR of a spectra that has the molecular formula:C4H7ClO2

33. ## math

A discount store takes 50% off of the retail price of a desk. For the store's holiday sale, it takes an additional 20% off of all furniture. The desk's retail price was \$320. How much is the desk on sale for during the holiday sale?

34. ## English

I included the last sentences on cheetahs and a few more on the use of gerund/infinitive. Thank you. 1) This project aims at establishing a second, independent population of Asiatic lions and will hopefully enable the subspecies to survive, too. 2) This

35. ## physics

A pitcher throws a baseball to a batter at 95 mph from a distance, d, away. The batter swings and hits the ball. (5280 ft = 1 mi, g = 32.174 ft/s/s). a) Assuming the pitch travels the full distance, d, how much reaction time does the batter have to hit the

36. ## statistics

The First National Bank of Wilson has 680 checking account customers. A recent sample of 60 of these customers showed 32 to have a Visa card with the bank. Construct the 98 percent confidence interval for the proportion of checking account customers who

37. ## Physics

What minimum speed does a 170 g. puck need to make it to the top of a 6.0 m. long, 27 frictionless ramp?

38. ## English

1) How do you usually quote the title of a chapter within a book? Thank you. Example: Jonathan Swift (author) Gulliver’s Travels (novel: italics + bold?) Beloved Horses, Hateful Men (title: italics?) 2) Full/complete reading of the abridged edition of

39. ## Algebra

A student is taking a literature course in which four tests are given. To get a B, he must average at least 80 on the four tests. The student got scores of 82, 76, and 78 on the first three tests. Determine (in terms of inequality) what scores on the last

40. ## Statistics

This is my first stats class and I don't know how to do this, could you please help me? Thank you. You are asked to determine the typical number of sales of a certain product at the store you work for. A sample of 50 days over the last quarter shows an

41. ## Chemistry

What does it mean when we say that KHC8H4O4 is not hygroscopic ? thank for helping~

42. ## Math

How to factor 4y^2+4yz+z^2-1?

43. ## statistics

Calculate the first, second, and third quartiles: 20,26,28,25,31,14,23,15,12,26,29,24,31,19,31,17,15,17,20,31,32,16,21,22,28

44. ## Math

How to write l,582,658,124 in word form

45. ## Physics

A simple Atwood’s machine uses a massless pulley and two masses m1 and m2. Starting from rest, the speed of the two masses is 4.1 m/s at the end of 7.6 s. At that time, the kinetic energy of the system is 86 J and each mass has moved a distance of 15.58

46. ## chemistry

what mass of water is required for the formation of 175 grams of carbon monoxide? please show work

47. ## chemistry

6.67 mL of 18.0 molar sulfuric acid solution was dissolved in enough water to make 500 mL of solution. The molarity of the diluted solution is

48. ## Physics

A comet is traveling towards the earth. The comet has a mass of 5.50E+12 kg and a radius of 323 m. The comet is traveling with a speed of 13.5 km/s and spinning with a period of 0.15 seconds when its center is a distance 2.28E+7 m away from the center of

49. ## physics

An artificial satellite circling the Earth completes each orbit in 139 minutes. (The radius of the Earth is 6.38 106 m. The mass of the Earth is 5.98 1024 kg.) (a) Find the altitude of the satellite.

50. ## science

what do all animals have in common?

51. ## Physics

A 95 kg rowboat is initially at rest, until it is pulled toward the dock with a rope with a tension of 30.0 N. The dock is higher than the boat, and the rope makes an angle of 25° at the place where it meets the boat. What is the acceleration of the boat?

52. ## physics

A cylinder with a movable piston holds 2.75 mol of argon gas at a constant temperature of 295 K. As the gas is compressed isothermally, its pressure increases from 101 kPa to 121 kPa. Find (a) the final volume of the gas, (b) the work done by the gas, and

53. ## Chemistry

A mettallurgist decided to make a special alloy. He melted 30 grams of Au(Gold) with 30 grams of Pb. This melting process resulted to 42 grams of an Au-Pb alloy and some leftover Pb. This scientist wanted to make 420 grams of this alloy with no leftovers

54. ## to ms.sue

i know it's late and well I don't know what sentence I could use using the word twined.And how come you aren't trick-or treating.I'm not because I have alot of homework.My sister and my momwent just 13 minutes ago.

55. ## math

If a ¼ of a teaspoon is 1 ml, then how many milliliters are in 6 teaspoons

56. ## Factoring Trinomials

Working on how to factor trinomials, and the method that works best for me is the criss cross method, so Ive sticked with it. But Ive been stuck on one question for the past few minutes, and don't know what I've been doing wrong. 4x^2+23x+15 2x and 2x

57. ## Spanish Fun

Isn't "Halloween" still "Halloween" in Spanish

58. ## American Government

what are some problems with regulatory agencies?

59. ## Physics

While riding a Ferris wheel, the rider determines that the Ferris wheel makes 1.5 revolutions per minute. a) knowing that the diameter of the Ferris wheel is 100 ft, determine the angular speed (in rad/s) of the Ferris wheel. b) Determine the linear speed

60. ## science

What is the topography , climate and resources of mount vernon, new york 10550

61. ## English

He is wearing the kind of clothes I wear. ================== In the sentence above, what is the antecedent of the relative clause? 1. clothes 2. kind 3. the kind 4. the kind of clothes Which one among the four?

62. ## Physics

If two different masses have the same kinetic energy, their momenta are: a. proportional to the squares of their masses b. proportional to their masses c. proportional to the square roots of their masses d. inversely proportional to their masses e.

63. ## Org.chem. I

why is the toxicity of (+)-carvone in rats is about 400 times greater than that of(-)-carvone?

64. ## Calculus - Math

Sorry in advance - it's a very wordy, multi part question. The parts with the ..........are the parts that require an answer. I have no idea where to begin or what to do to solve this. We will determine the volume obtained when revolving the solid bound by

65. ## SCIENCE

i am doing a project on pneumonia. i need to answer the following questions in a proper sentence. 1. does pneumonia affect both men and women? 2. what are the chances for survival. 3. what is the % of population affected? 4. is the disease on the increase

66. ## English

The accident occurred on a/an ______ road A. intact B. enlisted C. isolated D. forging I know what all the words mean I just don't know which one is best. I thing it is wither isolated or intact. Help would be immensely appreciated.

67. ## Org. Chem.

If you were relying on IR data alone,could you determine if you had the (+) or (-) form of carvone? why or why not? suggest one other method for detection.

68. ## Math

I would like my investment to double in value every 3 years. At what rate of interest would I need to invest it, assuming the interest is compounded continuously?

69. ## SCIENCE

thanks for helping me on the other questions but i have 1 more... what is the % of population affected with pneumonia. If you could answer this question than it will be very helpful. thank you :)

70. ## calculus

Find the derivative of the function. HINT [See Quick Examples on page 835.] f(x) = 9x ln x

71. ## stats

if IQ is normally distributed with a mean of 100 and a standard deviation of 10, what stand score (z-score) would represent a person with an IQ of 75?

I've reworked this and added on is any of it correct?Totally confused-learned this today and I don't get it-Please help Write the standard form of 9x^2 + 4y^2-72x+16y+124=0 I think the first step is to take the constant to right side so I have: 9x^2 +

73. ## Chemistry

What solid forms when sulfuric acid is added to a reaction mixture of p-aminobenzoic acid and absolute ethanol?

74. ## Phi103

explain what logic can and cannot do. In other words, what kinds of questions and logic are not decided by logical analysis

75. ## Calculus

Calculate the indefinite integral of ((x^3)+1)/(x^5)

76. ## Chemistry

Use Equation 7.1 and assuming that core electrons contribute 1.00 and valence electrons contribute nothing to the screening constant, S, calculate Zeff} for these two ions. Express your answers as integers. Enter your answers numerically separated by a

77. ## Calculus 1

Use Newton's method to approximate the root of the equation x^3+x+2=0 with initial guess x1=-1 gives:

78. ## physics

Find the pressure exerted by a solid,when placed on a wooden platform.The area of contact is 200 cm and the solid weight 150 N?

79. ## Science

What geological forces might have created land, sea, and sky by Phil Brodatz?

80. ## physics

A solid body weighting 100N and having a base area of 2m is placed on the ground.Find the pressure exerted by the solid body on the ground.

81. ## college algebra

use the given zero to find the remaining zeros of each function.g(x)=x^3+3x^2+25x+75;zero:-5i

82. ## Stats

Examining the location of accidents on a level, 4-mile bike path shows that they occur uniformly along the length of the path. What is the probability that an accident would occur over the first mile of this bike path? Give your answer as a number between

83. ## probability

carlos shoots a free throw in basketball, what are the chances of making a basket?

84. ## psy 202

8. What is the general term Freud used to describe the process whereby the mind protects itself against distress? (Points : 1) Compensation Defense mechanism Rationalization Displacement

85. ## Biology

Can genetic mutations also occur within mitochondria and cause diseases? if yes, how common are these diseases?

86. ## Org Chem. I

Using the Cahn-Ingold-Prelog sequence rules,assign priorities to the groups around the chiral carbon in carvone. Draw the structural formulas for (+)- & (-)-carvone with the molecules oriented in the correct position to show the R & S configurations.

87. ## Statistics

This problem does not make any sense to me!!! I would greatly appreciate your assistance, thanks. A recent survey showed 4.6 percent of the sample of 250 had suffered some kind of identity theft in the past 12 months. a. Construct a 90 percent confidence

88. ## Early childhood edcation

1)when a child demonstrates an anability to leap over a barrier his teacher checks to see if he has mastered the skills of jumping down from a height and jumping for distance. In doing this the teacher is a)applying a developmental perspective b)measuring

How to write effective Case Study

90. ## chemistry

If 58g of NaOH are dissolved in water to make a final volume of exactly 400mL, what is the molar concentration of NaOH? (The FM of NaOH = 40.0) How do I set this up?

91. ## Chemistry

Potassium, K, is more reactive than sodium, Na. Calcium, Ca, is less reactive than sodium. The comparative reactivity of these metals is often noted as: K > Na > Ca. Explain the reactivity differences of K, Na, Ca.

92. ## Chemistry

Suppose that a PES experiment is performed in which mercury vapor is irradiated with ultraviolet light of wavelength 58.4 nm. What is the energy of a photon of this light, in eV?

93. ## Botany

During the last part of cellular respiration in the mitochondrion, electron flow is tapped and used to make ATP. Where do the electrons end up when they are finished flowing?

94. ## calculus 1

how do i find all vertical and horizontal asymptotes for the function y= 3x^2-8x+25/x^2+7x-18

95. ## College Chemistry

As a system increases in volume, it absorbs 52.5 J of energy in the form of heat from the surroundings. The piston is working against a pressure of 0.500 atm. The final volume of the system is 58.0 L. What was the initial volume of the system if the

96. ## math

what is 5/9 divided by 5

Truth or False : for business writing,it is always best to present the most analytical, matter of fact writing in order to be convincing. most claims in business,and in persuasive writing generally tend to be contestable claims.this requires the author of

98. ## Math

Find the solution of the equation. 1. 2x=12 answer: x=6 2. 4x=20 answer: x=5 Did I answer these correctly?

99. ## College Chemistry

Consider a mixture of air and gasoline vapor in a cylinder with a piston. The original volume is 50. cm3. If the combustion of this mixture releases 955 J of energy, to what volume will the gases expand against a constant pressure of 675 torr if all the

100. ## College Chemistry

One mole of H2O(g) at 1.00 atm and 100.°C occupies a volume of 30.6 L. When one mole of H2O(g) is condensed to one mole of H2O(l) at 1.00 atm and 100.°C, 40.66 kJ of heat is released. If the density of H2O(l) at this temperature and pressure is 0.996

101. ## math

what is 13 6/7 coverted to a decimal rounded to the nearest hundredth?

102. ## Agriculture Econ

What is the relationship between the price elasticity & the total revenue received by produces of a commodity

103. ## english

how to rewrite this sentence Hibertnation helps an animal with an animal's survival

104. ## math

From 1950 to 1970,some glaciers in Alaska thinned by an average of 1.7 ft per year.What was the change in glacier thickness during this period?

105. ## physics

One end of a massless coil spring is suspended from a rigid ceiling. It is found that when a 4 kg mass is suspended from it the spring stretches 90 mm when the mass comes to rest. (a) What is the spring constant for the spring B)If the mass is then pulled

106. ## Language Arts

What is a phrase for admirably?

107. ## Chemistry

What happens in confirmatory test for bismuth? What happens in confirmatory test for copper? What happens in confirmatory test for arsenic? Please help! an you explain in detail. even a link explaining it would help

108. ## Chemistry

How would you test a solution containing only Co2+ and Fe3+ ions?

109. ## English

Could you please revise the following sentences, please? 1) As a matter of fact, two among our science teachers are willing to partake in the project where English would be the lingua franca. 2) Translate the following words into English, then choose two

111. ## Science

How can too many water plants cause the dissolved oxygen level in the water to be too low?

112. ## Economics

Total cost and total variable cost are parallel, yet average total cost and average variable cost are not parallel. a. Demonstrate mathematically that ATC and AVC are not parallel. b. Show mathematically that when both ATC and AVC are falling, ATC falls

113. ## physics

a bullet leaves the barrel of a gun with the speed of 320m/s. the barrel is 80.0cm long. Assuming uniform acceleration, determine a)the time it took b)the acceleration of the bullet

114. ## critical thinking.

which of the following is the best example of "negative evidence" for the claim," samsung makes excellent quality phones"? A. 50.6 of htc evo users prefer evo to samsung's android. B. the main competitors of samsung are htc,nokia and black barry. C. 4 out

115. ## English

Section Five describes process analysis in detail. What is the main point of process analysis in writing? Why are the four basic steps of process analysis important? What happens if you skip a step?

116. ## Calc

Solve: du/dt = (sin t) / (u^2 + 1) So far I got: arctan u = -ln |csc t + cot t| + C I'm not sure where to go from there. Thank you so much for the help!

117. ## Physics

Does the KE of a car change more when it accelerates from 27 km/h to 37 km/h or when it accelerates from 37 km/h to 47 km/h? 1. More information is needed. 2. No diﬀerence 3. From 37 km/h to 47 km/h 4. From 27 km/h to 37 km/h

118. ## English

What if I used the word "both" to refer to the two adjectives? Translate the following words into English; then choose two adjectives describing a person's character and define them both briefly.

119. ## Economics

Consider the production function Q= 20K^(1/2)L^(1/2). The firm operates in the short run with 16 units of capital. a. The firm's short-run production function is Q=? b. The average product of labor function is AP=? c. The marginal product of labor function

120. ## algebra

\$7,000 is invested into two accounts: 4,000 into an account paying 5% interest compounded monthly and \$3,000 into an account paying 4.1% interest compounded continuously. compute the total interest earned at the end of 2 years.

122. ## MATH

given the arithmetic sequence 71,65,59 ... if a(n) is -43 what is the value of n

123. ## Economics

Total cost and total variable cost are parallel, yet average total cost and average variable cost are not parallel. a. Demonstrate mathematically that ATC and AVC are not parallel. b. Show mathematically that when both ATC and AVC are falling, ATC falls

124. ## math - natural logs

Find the EXACT solution to e^(1-x) = 4^x You must use logs, not just a calculator.

125. ## algebra

Can u traslate the following into words 3+w 8x 40-p

126. ## algebra

Researchers use formula f(t) = Pe^rt to model the population of fruit flies growing exponentially after t days. Measurements show that f(0) = 30 and f(5) = 1620 a) Find a function of the form f(t) = Pe^rt that models the fruit fly population after t days.

127. ## trig

Hi, I need to find the domain and rnge of the following: 1. X= 1/2 (cos theta + theta sin theta) Y=1/2 (sin theta - theta cos theta) total guess here, but here goes Domain cos theta = +/- 1 and domain sin theta = +/- 1 so domain theta sin theta = 0-

128. ## Biology

Does light wavelength affect cellular respiration rate? I know that it affects photosynthetic rate. I think it is not supposed to affect cellular respiration rate, but I recently conducted an experiment that has proved otherwise and I just want to make

129. ## Genetics

What is an approximate value of the length of a 30 nm fiber that contains 120,000 nucleotide pairs of DNA?

At issue in the twenty-first century is the trade-off between the necessity of writers, musicians, artists, and movie studios to profit from their work and the free flow of ideas for the public benefit. Movie (and music) industry participants claim that

131. ## geography

Which is closer to the South Pole, the southern tip of Africa or the most southern edge of mainland Australia? My answer is the most southern edge of mainland Australia.

132. ## physics

A horizontal rod with a length of 0.250 is mounted on a balance and carries a current. At the location of the rod a uniform horizontal magnetic field has a magnitude of 6.70×10−2 and direction perpendicular to the rod. The magnetic force on the rod is

133. ## physics

A horizontal rod with a length of 0.250 is mounted on a balance and carries a current. At the location of the rod a uniform horizontal magnetic field has a magnitude of 6.70×10−2 and direction perpendicular to the rod. The magnetic force on the rod is

134. ## World Lit

Compare and contrast Oedipus, from Sophocles’ Oedipus the King, and Creon from Sophocles’ Antigone as rulers. Some ways they are the same is that they both are rulers and they are wealthy people. Oedipus accuses Creon of conspiring against him. ** I

135. ## BioChem

If you run an unknown sample and it is darker than your highest standard on your standard curve, what do you report as the concentration?

136. ## math - logs

2 ln (x) = ln (20-x)

137. ## Marketing

The process of naming broad product-markets and then dividing them in order to select target markets and develop suitable

138. ## BioChem

If you want to determine the actual salicylate concentration for a sample that gives you a darker color than the highest standard, you would need to make a dilution of it. If you dilute it by mixing .25 mL of sample with .75 mL of water and then find that

139. ## English

I forgot to include the following sentence. 1) Write a ten-line paragraph about you. describing your physical apperance and character. Then refer to the things you like and to a typical school day.

140. ## math

each student will create an adding, subtracting, multiplying, or dividing expression containing square roots.you will simplify the expression and display it step by step. There can be no use of perfect squares in the original expression.

141. ## English

The following is Karen Jo Shapiro's poem, "Me." ......... ........ ....... So many kinds of folks I see, but only I can be a ME. ================================== (Question) Would you explain 'So many kinds of folks I see'? 1. So many kinds of folks

142. ## English

1. There are two mes in me. 2. I am a unique me. 3. I am me. 4. I am a me. 5. I am a ME. 6. I am ME. 7. I am Me. (Are the expressions all grammatical? Can we use some in a poem? What is the difference?)

143. ## math

The number of cases for a disease has reduced by half every 10 years: 1970 - 21,168 1980 - 10,584 1990 - 5,292 Assume N is the number of reported cases t years after 1970. Which is a good model for N(t)? a) 21,168 (2)^t b) 21,168 (1/2)^t c) 21,168

144. ## Math

Is this a rational, irrational, or not a real number the square root of 49 and the square root of -81

145. ## Science

Different elements have different kinds of atoms. How can you tell an atom of one element from an atom of another? A. the number of electrons B. the number of neutrons C. the number of nuclei D. the number of protons

146. ## physcis

equation of nuclear fission of urnaium 235 forming iodine 131

147. ## Calculus

Estimate delta f using linear approximation F(x) = x^ (1/3)e^(x-1), a=1, delta x = 0.4 linear approximation for delta f = Error is = Percentage error is = please explain tburoughly

148. ## Maths

A mathematics class has 200 members. If there is 12% absentee rate per class meeting, find: a) mean, variance and standard deviation number of students who will be absent from each class. b) Draw the probability table and distribution graph of the number

149. ## Statistics

A mathematics class has 200 members. If there is 12% absentee rate per class meeting, find: a) mean, variance and standard deviation number of students who will be absent from each class. b) Draw the probability table and distribution graph of the number

150. ## science

explain why must the ramp be angled initially to get a starting height

151. ## World Lit 1

What do the Norsemen call the Arab’s white horse? a. High Jumper b. Dog c. Pale Moon d. Rabbit I think it is Pale Moon. But I am not 100% sure. Please someone help me

152. ## statistics

A researcher is investigating whether, on average, 3rd grade males have significantly different creativity scores than 3rd grade females. She samples students from a large school district where she works. What is the independent variable?

153. ## Science

Different elements have different kinds of atoms. How can you tell an atom of one element from an atom of another? A. the number of electrons B. the number of neutrons C. the number of nuclei D. the number of protons

154. ## Math

5 4 ______ - ______ 2(e-f) 3(f-e) Please include workings thx

155. ## chem

why doesanhydrous hydrogen bromide add to 1-pentene to afford a racemic mixture of. 2-bromopentane, and not 1-bromopentane.

156. ## English

What are some alliteration for tigers?

157. ## Math

4C/(10C-5D) + 2D/(6C-3D) Please include workings thx

158. ## Math - 2 Questions

1. (1/4)C/C+(1/3) 2. (1/X)+(1/Y)/(2/X) Please include workings and thank you in advance

159. ## science chemistry

enumerate the 100 alkanes and its molecular formula

160. ## Religion

What kind of bookS can I find information on about US religion groups and the race involved with each other? Have to write a paper and its a hard topic. HELP!!!!!!

161. ## Religion

What kind of books can i find online that tells me about US religion groups and their race that involved each other? I have to write a paper on a very hard topic. HELP!!!!!!!!!!!!!

162. ## English

what are some alliterations for wild that describes a tiger?

163. ## english

is fighty a word?

if m

165. ## Science

A salinity meter placed in a tidal pool shows a dramatic decrease in salinity between 2 A.M. and 3 A.M.. This decrease is followed by a gradual rise in salinity from 11 A.M. until 4 P.M. the next day. What might explain these changes?

167. ## statistics

The average age of a child in kindergarden is 5 years or 60 months. The standard deviation is 12 months. If a random child is selected, find the probability that the childs age is between 54 and 66 months.

168. ## English

I really need your help to revise a paragraph on Asian cheetahs. I'll post a part each time. 1) The Asian cheetah, once common in India and valued by aristocrats for its ability to catch deer (antelopes), is on the point of dying out around the world. 2)

169. ## calculus

simplify (ln(8x^2))/(ln(4x)) Thanks!

170. ## Physics

A child sits down on one end of a horizontal seesaw of negligible weight, 2.14 m from the pivot point. No one balances on the other side. Find the instantaneous angular acceleration of the see-saw and the tangential linear acceleration of the child.

171. ## statistics

Suppose a random sample of 25 students is selected from a community college where the scores in the final exam (out of 125 points) are normally distributed, with mean equal to 112 and standard deviation equal to 12. Find the probability that the sample

172. ## science

Which of the following characteristic differentiate Eubacteria from Archaebacteria? 1. Circular nature of chromosome. 2. Absence of nuclear membrane. 3. Presence of 70S ribosomes. 4. Presence of murein in cell wall.

173. ## english

is cool cats an alliteration?

174. ## English

Thank you very much for your corrections! Here are other statements on the same newspaper article. 1) The cheetah reintroduction programme is kicking off (starting?) with a meeting of experts in September. 2) The project includes the foundation of a

175. ## math

Divide 25 in two parts such that its product is 126

177. ## maths

show that the lines x^-4xy+y^=0 and x+y=1 form an equilateral triangle and find its area

178. ## Chemistry

calculate the frequency of an xray having a wavelength of 3.5*10to the negative seven m. (meters).

179. ## statistics

Math Answer: How much is 35 plus 78 minus 29 equals?

180. ## sentences

what is a sentence I can use using the word unyielding

181. ## Algebra

Totally confused-learned this today and I don't get it-Please help Write the standard form of 9x^2 + 4y^2-72x+16y+124=0 I think the first step is to take the constant to right side so I have: 9x^2 + 4y^2-72x+16y=124 But then I'm lost!

182. ## n/a

Is it not possible to talk to tutors or students directly?

183. ## Chemistry

What energy is associated with a photon in the infared region of the spectrum having a frequency of 4.5*10^12s^-1

184. ## argumentative essay

more biological influence and risk factors related to alcohol

185. ## accounting

1. Describe the roles and responsibilities of management and independent auditors in the financial reporting process 2. Define the following three users of financial accounting disclosures and the relationships among them: a) Financial analysts b) Private

186. ## math analysis

A rectangle with its base on the x axis is to be inscribed under the positive portions of the graph of y=8-x^2 . Write an equation for the area of the rectangle which uses only the variable x.

187. ## Chemistry

calculate the energy associated with a photon whose wavelength is 14.5*10^-8cm.

188. ## Math

An Air Force study indicates that the probability of a disaster such as the January 28, 1986 explosion of the space shuttle Challenger was 1 in 35. The Challenger flight was the 25th mission. a. How many disasters would you expect in the first 25 flights?

189. ## phy

A frog applies a constant force of 80N while pushing him up a hill, while gravity and legs friction cause a constant 80N force in the opposite direction. In this situation a. the frog applied force of 80N means the frog must be accelerating b. the net

190. ## Chemistry

Calculate the wavelength of a photon of yellow light whose frequency is 6.3*10^5m. (meters)

191. ## Chemistry

Calculate the frequency of a photon of orange light whose wavelength is 6.2*10^5m. (meters)

192. ## Statistics

A recent article in the Myrtle Beach Sun Times reported that the mean labor cost to repair a color television is \$90 with a standard deviation of \$22. Monte’s TV Sales and Service completed repairs on two sets this morning. The labor cost for the first

193. ## Science

Study the data table below. A three-column table presenting the 'Melting Point and Boiling Point for Common Substances.' The column headers are 'Substance,' 'Melting point (°C),' and 'Boiling point (°C).' For substance aluminum, the values are '660' and

2d+3=13

195. ## physics

if the forces that act on a bullet and on the recoiling gun from which it is fired are equal in magnitude, why do the bullet and gun have very different accerlerations

196. ## math

h(x)=2x-5 h(0)= h(-8)=

197. ## Chemistry

How much energy is associated with a photon in the gamma ray region of the spectrum with a frequency of 6.6*10^5s^-1

198. ## math

solve the equation. check the solution 5 x g -5 = 100

199. ## Physics

A bullet of mass 4.8 g strikes a ballistic pendulum of mass 3.3 kg. The center of mass of the pendulum rises a vertical distance of 9.7 cm. Assuming that the bullet remains embedded in the pendulum, calculate the bullet's initial speed. ....I'm getting an

200. ## physics

if the forces that act on a bullet and on the recoiling gun from which it is fired are equal in magnitude, why do the bullet and gun have very different accerlerations

201. ## Chemistry

The weight of dry acid are measured to the nearest milligram; however the volume of water in which it is dissolved is never a critical concern--water is even added to the Erlenmeyer flask while washing its wall during the titration . Explain why the

202. ## statistics

Suppose that you have just taken a test and earned a score of 90%. Your instructor informs the class that the grades were normally distributed, that the average was 75%, and the standard deviation was 12%. Calculate your z-score to the hundredths place.

203. ## science

how are climate and weather related to currents? give two examples

204. ## Bios

What exactly should I write in a senior yearbook bio?

205. ## english

Any suggestions for corrections? It’s The Little Things In my line of work, my passion for helping others can often times be a thankless job. Once in a while, in the midst of pain, suffering, and chaos, I experience feelings that are in contrast to what

206. ## MRU

suppose a population of nursing students heights is normally distributed with a population mean of 166 cm and a population stanadr deviation of 7.5cm if a female is randomly selected from this population, what is the probability that she will have a height

207. ## Chemistry

Is it quantitatively acceptable to titrate all KHC8H4O4 samples with the NaOH solution to the same dark red endpoint ?Explain. thank for helping~

208. ## Social Studies-Amrican History

What were some of the first calls of independence ffrom the colonists??? I've got a few: Join or Die Unite or Die Don't tread on me Give me librty or give me Death ......

209. ## el camino real

if income in the US was normally distributed, what z-score would represent the bottom 10%, the poorest 10%

210. ## chemistry ASAP

name the following: H2SeO3 H2TeO2 PO3^3- HCLO4 Please explain how to find the names !!!!!

211. ## stats

if income in the us was normally distributed, what z-score would represent the top 1%?

212. ## Chemistry

Consider the last electron in B: Values for n,l,and ml of 2,0,0 cannot be used. Why not? so is this the same answer as lithium. The ground stat cant have l=2 since it has no p electrons? Are values of 3,0, 0 allowed? Why or why not? I would say no for the

213. ## Math

8m ≥ 2(2m +3) is the answer 8m ≥2(2m + 3)