# Questions Asked onApril 7, 2013

1. ## precalculus

Solve 8sin(pi/4x) = 6 for the four smallest positive solutions Give your answers accurate to at least two decimal places, as a list separated by commas.

2. ## precalculus

Solve 5 cos(3 x) = 2 for the smallest three positive solutions. Give your answers accurate to at least two decimal places, as a list separated by commas

3. ## Precalculus

Solve cos(x) = -0.44 on 0 (less than or equal to) x (less than) 2pi There are two solutions, A and B, with A < B Give your answers accurate to 3 decimal places

4. ## Precalculus

Solve 8 sin(2 x) = 6 for the two smallest positive solutions A and B, with A < B Give your answers accurate to at least two decimal places.

5. ## Precalculus

Solve sin(x) = -0.36 on 0 le x lt 2pi There are two solutions, A and B, with A < B and A and B in radians to 4 decimal places.

6. ## math

a cube is 5x5x5. How many smaller cubes in the larger cube. So I just mult. to get 125?

7. ## history

Why did the US intervene in Vietnam, during the Vietnam War, and support Diem's regime for econommic reasons? Not only for America's own good but for what else?

36. ## math

The function g(x)= x/453.6 converts x grams to pounds, as shown. Which composite function expresses the number of pounds that can be lifted by a balloon containing x ft3 of air?

37. ## Chemistry

When the concentration of a weak acid in solution is equal to the concentration of its conjugate base in solution, then: Would pH=pKa or would it equal pH=pKa + 1 like Henderson-Hasselbalch equation?

38. ## Chemistry

When looking at a titration curve, I have to determine which is not true and I have it narrowed down to two options: The initial starting point on the titration curve is where pH depends only on [HA]0 or The finial point on a titration curve the pH depends

39. ## Chemistry

What is the [H+] of the 0.25 M HCl solution? I'm not given a Ka value, so I'm assuming I won't need one to solve this particular problem?

40. ## chemistry

calculate the pH at 25 celcius degree of 0.080 mol/dm-3 HNO3

41. ## Chemistry

The indicator bromocresol green (HIn) can be in two different forms: As HIn the color of the indicator is yellow, an In the color of the indicator is blue, and an equilmolar mixture of the two species is green. The Ka of the indicator is 2.5 x 10-5. What

42. ## c+=

true life magazine wants an analysis of the demographic characteristics of readers in c++ the marketing department has collectedreader survey records containing the age , gender , marital status ,and annual income of readers the data is stored in an input

43. ## Life orientation

What is community organization that are involved in supporting or giving redress to alcohol

44. ## Lifeorientation

Way in which you critically discuss how life style behaviour impact on the teenager

45. ## Agriculture

What records should be kept for efficient management of a dairy herd?

46. ## life orientation

Identify and describe 3 environmental health hazards that ill health,crises,and or disasters

47. ## Chemistry

i. Which of the following solutions has the lowest pH (more acidic). Explain you answers. a. a 0.1 M solution of a strong acid or a 0.1 M solution of a weak acid. b. a 0.1 M solution of an acid with Ka=2×10-3 or one with Ka=8×10-6 c. a 0.1 M solutions of

48. ## physical science

A builder pushes a wheelbarrow loaded with sand ,from rest at point A,up a ramp of unknown length ,which is inclined at unknown angle ,vertical height of unknown 2,75m

49. ## English

I want to learn how to write an appropriate letter to the editor in no more than 200 words. I took the article "stuck in the middle" by Jeevan Vasagar of "The Guardian" as an exercise, you can find it on Google. Unfortunately, I am not allowed to post

50. ## science

A train accelerates uniformly in a straight line at 0.3m/s from from rest. Calculate the velocity 15 seconds after its depature. Calculate the time taken to reach 30km/h and the distance covered by the train.

51. ## math

A plane leaves hamilton and flies due east 75 km at the same time a second plane flies in a direction of 40degress southeast for 120 km how far apart are the planes when they reach their destination. I say the calculation is 75^2+120^2-2(75)(120)cos40 the

52. ## biochemical genetics

You have discovered a new species of yeast and you would like to determine the pathway that this organism uses to synthesize the amino acid tryptophan. This yeast species can take up tryptophan, or synthesize it on its own if tryptophan is not present in

53. ## biochemical genetics

After several rounds of experiments like those described above, you find that you have identified five different genes involved in the biosynthesis of tryptophan in this organism. You name them Gene 1 through Gene 5. Based on your knowledge of the pathway

54. ## biology

Consider the pedigree below. This pedigree represents a family with a rare genetic disease. Note two very important assumptions: Individuals who marry into the family may carry a disease allele. The disease is completelely penetrant. That is, any

55. ## biology

(b) Is this pedigree consistent with autosomal dominant inheritance? Yes No If you chose "yes", answer questions (i) and (ii) and leave parts (iii) and (iv) blank. If you chose "no", leave parts (i) and (ii) blank and answer questions (iii) and (iv). i) If

56. ## biology

(c) Is this pedigree consistent with sex-linked recessive inheritance? Yes No If you chose "yes", answer questions (i) and (ii) and leave parts (iii) and (iv) blank. If you chose "no", leave parts (i) and (ii) blank and answer questions (iii) and (iv). i)

57. ## biology

(d) Is this pedigree consistent with sex-linked dominant inheritance? Yes No If you chose "yes", answer questions (i) and (ii) and leave parts (iii) and (iv) blank. If you chose "no", leave parts (i) and (ii) blank and answer questions (iii) and (iv). i)

58. ## chemistry help

1. Calculate the energy change (q) of the surroundings (water) using the enthalpy equation qwater = m × c × ΔT. We can assume that the specific heat capacity of water is 4.18 J / (g × °C) and the density of water is 1.00 g/mL. Show ALL your work. The

59. ## English III Love of Life By: Jack London

Love of Life by Jack London I'm really having problems, how to start the body of my essay in this story. Can you give me some hint, how to make the 1st step? thank you :)

60. ## physics

A 63.8 N crate is pulled up a 5.22 m inclined plane by a worker at constant velocity. If the plane is inclined at an angle of 59 degree to the horizontal and there exists a constant frictional force of 32.6 N between the crate and the surface, what is the

61. ## L.O

in 15 lines critically discuss 5 ways in which the human or environmental problem impacts on the community.provide relevant sources to support your claims.

62. ## physics

A train accelarates uniformly in a straight line at 0.3m/s^2 from rest. Calculate the velocity 15 seconds after its departure. Calculate time taken to reach 30km/h and calculate Distance covered by the train

63. ## AP Stats (math)

A large metropolitan area found that the time it takes for people to commute to work has a mean of 20.5 minutes and a standard deviation of 15.4 minutes. What is the probability that a random sample of 40 people have a mean commute time greater than 25

64. ## Math

A cylinder shaped jar has a radius of 2 cm and a height of 6 cm. What is the volume of the jar?

65. ## math

he coned shaped room has a height of 15 feet and a radus of 72feet. What is the volume of the room?

66. ## math

I have a snow globe with a radius of 2 cm. What is the volme of the globe?

67. ## Life orientation

Poverty leads 2 ppl bng undernourised,n dey lck access 2 clean air n basic services.n als ppl hvng fewer choices abt whr dey liv,as dey may b frced 2 liv in polluted environment

68. ## Precalculus

Find all solutions to 2 sin(theta) = sqrt(2) on the interval 0 less than or equal to theta less than 2 pi Give your answers as exact values, as a list separated by commas.

69. ## Precalculus

Find all solutions to 2 cos(theta) = - 1 on the interval 0 less than or equal to theta less than 2 pi Give your answers as exact values, as a list separated by commas.

70. ## precalculus

Solve sin(x) = 0.64 on 0 less than or equal to x less than 2pi There are two solutions, A and B, with A < B Give your answers accurate to 3 decimal places

71. ## Pre-Calculus

Determine the number of triangles that can be formed with the given information. and if it forms two possible triangles solve all unknown angles and sides Angle A=116 degrees a=10 b=11

72. ## life orientation

In which five ways will the air pollution problem impacts on the community

73. ## Math

The inner diameter of a piston is normally distributed with mean of 10 cm and standard deviation 0.03cm a)below what value of inner diameter will fall fifteen percent of the piston rings?

74. ## chemistry

When 1988 J of heat energy is added to 47.5 g of hexane, C6H14, the temperature increases by 18.5 °C. Calculate the molar heat capacity of C6H14.

75. ## permutation

What would be the next 5 numbers after these: 66-30-34-57-87 & 46-79-32-36-82

76. ## stats.

One hundred subjects in a psychological study had a mean of 35 on a test instrument designed to measure anger. The study the ó=10. Find a 99% confidence interval for the mean anger score of the population.

77. ## stats

The president of a large university wishes to estimate the average age of the students presently enrolled. From past studies, the standard deviation ó is known to be 2 years. A sample of 50 students is selected and the mean is found to be 23.3 years. a.

78. ## life orientation

Critically discuss five ways in which air pollution problem impacts in the community

79. ## permutation

What would be the next 5 numbers after these: 66-30-34-57-87 & 46-79-32-36-82

80. ## Pre-Calculus follow up question Reiny

Determine the number of triangles that can be formed with the given information. and if it forms two possible triangles solve all unknown angles and sides Angle A=116 degrees a=10 b=11 but if you add 81.4 (measure of angle B) plus 116 (measure of angle A)

81. ## Math

in triangle DEF,

in triangle DEF,

83. ## life orientation

Critically discuss five ways in which air pollution problem impacts in the community

find the length of arc if an angle measuring 25 degrees is in the circle of radius 6 feet

85. ## life orientation

suggest 5 recommendations on how to address the environmental problems within south africa

86. ## life orientation

Critically discuss five ways in which air pollution problem impacts in the community

87. ## 5th grade math (word problems)

Stefan pours 5/8 cup of milk. He uses 2/3 of it for a bowl of cereal. What fraction of a cup of milk does he use with his cereal? solution: 5/8 * 2/3 = 10/24 = 5/6. So, is the answer 5/6?

113. ## Science

Phenylketonuria (PKU) is a human metabolic disease caused by the recessive allele k. If 2 heterozygous carriers of the allele marry and plan a family of five children: a) what is the chance that all their children will be unaffected? b) what is the chance

114. ## chemistry

Sodium fluoride and lead nitrate are both soluble in water. If 1.13 g of NaF and 0.232 g of Pb(NO3)2 are dissolved in sufficient water to make 1.00 L of solution, will a precipitate form? How do you know if there should be a precipitate or not? What is the

115. ## Math

Simplify. (82 - 60) + [(-3 x 4) - 36÷4] 25 19 10 1

195. ## math

If tan^2(t) - sin^2(t) = sin^a(t)\cos^b(t), then the positive power a = the positive power b =

196. ## chemistry

What volume of 2.25\it M \rm HCl in liters is needed to react completely (with nothing left over) with 0.750L of 0.200\it M \rm Na_2CO_3?

197. ## chemistry

A 337-\rm mL sample of unknown \rm HCl solution reacts completely with \rm Na_2CO_3 to form 17.1g \rm CO_2. What was the concentration of the \rm HCl solution?

198. ## physics

A boat is traveling on a bearing of 25 degrees East of North at a speed of 4 knots (a knot is 1.852 km/h). After traveling for 3 hours, the boats heading is changed to due South and it travels for an additional 2 hours at 5 knots. Using a Vector diagram,

199. ## math

Simplify and write the trigonometric expression in terms of sine and cosine: sin x +(cot x)(cos x) = 1/f(x) f(x)= ?

200. ## chemistry

for a .001M solution of methionine: a) calculate the isoelectric pH b) calculate the isoionic pH

201. ## physics

On its highest power setting, a microwave oven increases the temperature of 0.350 kg of spaghetti by 45.0°C in 100 s. (a) What was the rate of power absorption by the spaghetti, given its specific heat is 0.900 kcal/kg·°C? W (b) Find the average

202. ## Chemistry

calculate the ph of titration of 50.0 ml of 0.140 m hclo (aq)

203. ## physics

A 2.10 m diameter university communications satellite dish receives TV signals that have a maximum electric field strength (for one channel) of 7.90 µV/m. (a) What is the intensity of this wave? W/m2? (b) What is the power received by the antenna? W? (c)

204. ## Child day care

An encyclopedia on cd-Rom would be most appropriate for a typical

205. ## General Chemistry

What volume of 1.0 M HCl would react completely with 0.20 grams of NaC2H3O2*3H2O? It sounds like an equation I would set up as this and would use mole ratios to calculate the answer: HCl + NaC2H3O2*3H2O --> But I am confused as to what I would put as the

206. ## Physics

A single conducting loop of wire has an area of 7.4 10-4 m2 and a resistance of 110 Ω. Perpendicular to the plane of the loop is a magnetic field of strength 0.18 T. At what rate (in T/s) must this field change if the induced current in the loop is to be

207. ## Physics

A single-turn square loop of side L is centered on the axis of a long solenoid. In addition, the plane of the square loop is perpendicular to the axis of the solenoid. The solenoid has 1490 turns per meter and a diameter of 6.00 cm, and carries a current

208. ## calculus

*The sum of 6 times the length of a shed. It width is 60ft. What are dimensions that gives maximum area for floor of the shed?

209. ## Physics

A magnetic field increases from 0 to 0.09 T in 3.0 s. How many turns of wire are needed in a circular coil 20 cm in diameter to produce an induced emf of 7.5 V? Please help soon.

210. ## Physics

A mass of 0.22 kg is attached to a spring and is set into vibration with a period of 0.10 s. What is the spring constant of the spring? Answer in units of N/m

211. ## calculus

Please help!! *f(x)= x(x+6)^1/2 find two x intercepts. Then show that f'(x)=0 at some point between the 2 x intercepts. *Use mean value theorem for f(x)= x(x^2-3x+1) for interval [1,4] I FOUND DERIAVITIVE WHICH IS 3X^2-6X+1.THEN? *find all critical numbers

212. ## ap calculus

-find the coordinates for all points of inflection . find all intervals on which function has upward or downward concavity? -i found to be 2/5

213. ## statistics

The weight of a small Starbucks coffee is a normally distributed random variable with a mean of 410 grams and a standard deviation of 10 grams. Find the weight that corresponds to each eventa. A.Highest 30 percent b. Middle 70 percent to c. Highest 90

214. ## math

Jeanna wants to buy a new boat for her family. She has two payment options. The first option is to pay a cash payment of \$7,200. The second option is to finance the boat with a three-year instalment loan. The loan requires a 10% down payment and 36 equal

215. ## math

convert y=x^2+9x+14 to factored form

216. ## Physics

You drop a 1.60 kg book to a friend who stands on the ground at distance D = 12.0 m below. If your friend's outstretched hands are at distance d = 1.40 m above the ground (see the figure), (a) how much work Wg does the gravitational force do on the book as

217. ## Physics

A particle hangs from a spring and oscillates with a period of 0.2 s.If the mass-spring system remained at rest, by how much would the mass stretch it from its normal equilibrium position? The acceleration of gravity is 9.8 m/s^2

218. ## chemistry

what mass of K2SO4 would you measure out to prepare 350 mL of a .76 M solution? The gram formula mass of K2SO4 is 174.2 g/mol

219. ## chemistry

find the molality of a salt-water solution containing 0.27 mol NaCl in 150 g water.

220. ## math

Find the vertex of the parabola. y = -2x2 + 12x - 13

221. ## Physics

A car has a unibody-type frame and is supported by four suspension springs, each with a force constant of 36100 N/m. The combined mass of the car’s frame and everything inside it (the engine, the seats, the passengers, etc.) is 1270 kg. Because of

222. ## Write the expression as a single log

Write the expression as a single log. Express powers as factors ln(x/x-5) + ln(x+5/x) - ln(x^2-25)

223. ## chemistry

Sodium bicarbonate is often used to neutralize acids, such as the following reaction: NaHCO3 + HCl ---> NaCl + H20 + CO2. What is the normality of a sodium bicarbonate solution containing 5.08 g NaHCO3 in 150.0 mL solution? this chapter in chemistry is

224. ## Calculus

Find a formula for the fourth degree polynomial p(x) whose graph is symmetric about the y-axis (meaning it has no odd powers of x), and which has a y-intercept of 10, and global maxima at (3,253) and (−3,253).

225. ## math

How far does the tip of the minute hand of a clock move in 100 minutes if the hand is 3.3 inches long?

226. ## chemistry

What is the expected freezing point of a 3.50 m (m standing for molality)aqueous solution of BaCl2(Kfp= 1.86 degrees Celsius/m)? What is the expected boiling point(Kbp= 0.512 degrees Celsius/m)? which is effected to the greater extent, the boiling point or

227. ## Chemistry

Calculate the mass in grams of glycerol you would need to make 200 g of a 20% (w/w) glycerol solution.

228. ## chemistry

How many grams of H2SO4 are contained in 4.5 L of .30N (N standing for normality) sulfuric acid? Help would be much appreciated.

229. ## Science

A newspaper story on AIDS reports that an allele (R) confers complete resistance to HIV when homozygous and that 1% of the human population is resistant (RR). The story also states that 20% of the population carries one copy of the resistance allele (i.e.,

230. ## geometry

The ratio of two similar prisms is 2:5 the volume of the larger is 375cm3 if sand is being poured into the smaller prism at 3cm3 per second how many seconds will it tAke to fill the smaller prism?

Suppose that in the past, 94% of all Hispanic grocery shoppers were women. Perhaps due to changing cultural values, we believe that more Hispanic men are now grocery shopping. We randomly sample 689 Hispanic grocery shoppers from around the United States

232. ## Physics

A 4.1 kg bundle starts up a 31° incline with 148 J of kinetic energy. How far will it slide up the incline if the coefficient of kinetic friction between bundle and incline is 0.39?

233. ## chemistry

What are the freezing point and boiling point of an aqueous solution of 15.5 g glucose(C6H12O6) dissolved in 150 g of water?

234. ## English

1. This is the desk. That belongs to Bill. = This is the desk that belongs to Bill. 2. This is the window. Bill broke it yesterday. = This is the window that Bill broke yesterday. 3. This is the book. Its cover is red. = This is the book whose cover is

235. ## chemistry

Thimerosal is an organic compound (gram molecular mass = 404.8 g/mol) used to inhibit bacterial growth. A .100%solution of thimerosal is sometimes used as an antiseptic. Assume that this solution has a density of 1.00 g/mL. A. how many grams of thimerosal

236. ## math

Wondering the answers to these: Find the value of each of the following. Leave your answers as fractions where appropriate. [I did these myself but need to answer-check] a) log[base4](1/8) b) 10^(-10log3) c) 2log[base3](9) d) log[base3](3)^(2x) ans: a)

237. ## Algebra

Given f(x)=-4+lnx; Find the inverse of f. f^-1=?

Hi! I need help with determining the value of each of the following logarithmic expressions. Do not change the bases- thx a) log[base8]4 b)log[base(1/3)]27

239. ## math

For the curve y = log(x+3) determine the following: a) asymptotes, if any. b) intercepts, if any. c) domain and range

240. ## math

an airplane climbs at a rate of 66.8 feet per minute. It descends at twice the rate that it climbs. Assuming it descends at a constant rate, how many feet will the aitplane descend in 30 minutes.

241. ## Math

So I have a question regarding advanced functions, logarithm stuff. here is the question: Beginning with the function f(x) = log[base(a)]x ,state what transformations were used on this to obtain the functions given below: a) p(x) = -(5/8) log [base(a)]x b)

242. ## Psychology

In the theories of development, Who is the founder of the cultural theory?

243. ## trig

i nead to find to the nearest degree all values of theta in the interval 0 x 360 that satisfy the equation 3 cos 2 theta+ sin theta-1=0

244. ## Math

How do you convert 7 to the square root of 2 into a decimal? Also, how do you convert 3 to the square root of 8 into a decimal? Thanks

245. ## Algebra

Use properties of logarithms to find the exact value of each expression. Do not use a calculator. 8^log 8^5

246. ## Chemistry

A 72.2 g ice cube floats in the Arctic Sea. The temperature and pressure of the system and surroundings are at 1 atm and 0°C. Calculate ΔSsys, ΔSsurr, and ΔSuniv for the melting of the ice cube. (The molar heat of fusion of water is 6.01 kJ/mol.)

247. ## Chemistry

A solution containing a mixture of metal cations was treated with dilute HCl and no precipitate formed. Next, H2S was bubbled through the acidic solution. A precipitate formed and was filtered off. Then, the pH was raised to about 8 and H2S was again

248. ## in what order comes

This is highly advanced qquestion. You have a basket draw, and you have 14 balls left form 39 balls and 5 number will comes out next, would you be able to calculate which balls comes after sixth. It could be in any combo: for example: first draw 1 2 3 4 5

249. ## physical science

two cars 200meters apart drive towards one another. If one car travels at 12 meters/s and the other at 26 meters/s how long does it take for them to collide?

250. ## chemistry

this is a really long question. i don't understand how to answer it. help please. A 10.0% aquueous solution of sulfuric acid has a density of 1.0661 g/mL at 20 degrees celsius. A. how many grams of H2SO4 are found in 50.0 g of this solution? B. how many

251. ## English

Pansori is a kind of Korean folk play. 1. Bill is doing pansory at the school talent show. 2. Bill is presenting pansory at the school talent show. 3. Bill is acting out pansory at the school talent show. (Q1: Which one is correct in the sentences above?

252. ## LBCC

At a certain college, there were 780 science majors, 320 engineering majors, and 390 business majors. If one student was selected at random, the probability that they are a business major is?

253. ## LBCC

an apartment building has the following apartments: 2 bdrm 3 bdrm 4 bdrm 1st floor

254. ## LBCC

An apartment building has the following apartments: 2 bdrm 3 bdrm 4 bdrm 1st floor 7 3 4 2nd floor 9 0 11 3rd floor 8 4 7 If an apartment is selected at random, what is the probability that it is a 2 bedroom apartment on the 3rd floor?

255. ## LBCC

According to an Internet posting, 65% of adults enjoy drinking soda. Choose a group of 12 adults at random. The probability that none of them enjoy drinking soda is?

256. ## LBCC

A coin is tossed 4 times. Find the probability that the 4th toss is a tail, given that the first 3 tosses were all heads.

257. ## Math- Probability HELP

Tom Cruise is reported to be 5'7.8" tall. Male heights are normally distributed with a mean of 70 inches and a standard deviation of 2.8 inches. Find the probability that; 1) A randomly selected male is Tom Cruise's height or smaller. 2) Three randomly

258. ## LBCC

The number of movies shown in different theatres on Saturday morning in a small city is given in the following. x P(x) 1 0.15 2 0.20 3 0.30 4 0.10 What is the mean distribution (or expectation) of the data given above?

259. ## LBCC

Find the mean of the distribution shown. x 2 5 7 P(x) 0.28 0.42 0.30 What is the mean and the standard deviation of this distribution?

260. ## LBCC

A multiple choice quiz consists of 20 questions, each with 3 possible equally likely answers. If a student guesses at the answer to each question, then the mean number of correct answers selected by the student is?

261. ## chemistry

an aqueous solution solution of sodium borate is sometimes used to to fire-proof wood. a. what is the molarity of 2.50 L of solution that contains 1.85 moles of sodium borate? b. what is the molarity of 45.0 L of solution that contains 6.78 kg of sodium

262. ## English

1. He is doing voices of the former President Kim Youngsam at the school talent show. 2. He is imitating the voices of the former President Kim Youngsam at the school talent show. 3. He is mimicking the voices of the former President Kim Youngsam at the

263. ## science

dr. halite combined sodium metal with chlorine gas to make sodium chlorine (table salt). The chemical reaction used up all of the metal and sll of the gas. If dr halite made 116 g of table salt and started with 68 g of chlorine gas, then how many grams of