# Questions Asked onMarch 26, 2013

1. ## precalculus

Outside temperature over a day can be modelled as a sinusoidal function. Suppose you know the temperature is 80 degrees at midnight and the high and low temperature during the day are 90 and 70 degrees, respectively. Assuming t is the number of hours since

2. ## Chemistry 140A

A gas cylinder containing 6.38 mol of neon has a pressure of 491 mm Hg at 295 K. If 3.22 mol of helium is added to this cylinder, at constant temperature and volume, what will be the pressure in the cylinder?

3. ## physics

A cargo plane is moving with a horizontal velocity of vx = +225 m/s at a height of y = 920 m above level ground as shown in the figure below when it releases a package. Ignoring air resistance, how much time will it take the package to reach the ground?

4. ## Bisectors in a Triangle

Let ABC have side lengths AB=13, AC=14, and BC=15. There are two circles located inside

5. ## Physics

A test rocket is launched vertically from ground level (y=0m), at time t=0.0 s. The rocket engine provides constant upward acceleration during the burn phase. At the instant of engine burnout, the rocket has risen to 97 m and acquired a velocity of 40 m/s.

6. ## economics

Is your consumer behavior influenced by advertising or the news? Discuss one or two examples of media that have influenced your desires or affected your consumer choices

7. ## Chemistry

Using chemical equations, show how the triprotic acid H3PO4 ionizes in water. Phases, such as (l) or (aq), are optional.

52. ## Maths

Find the vakue of x: (1)logx2 = 2 (2) log3x^2 = -1

Solve the equation 2(x =10)=80

54. ## Language Arts (unfortunately, once again)

I hate to ask a similar question twice, but I am unable to describe the relationship between slain : snail :: flair : frail. I know the first three of five letters are switched, so would my relationship phrase be "switched" or "is switched to?"

55. ## chemistry

Suppose 87.9 grams of FeCl3 reacts with excess aluminum metal to produce 22.3 grams of Fe. What would be the % yield? FeCl3 + Al --> AlCl3 + Fe

56. ## chemistry

how many moles of O2 are contained in 6.53 L with 297 K and 6.6 atm

57. ## Form a polynomial f(x)

Form a polynomial f(x) with the real coefficients having the given degree and zeros. Degree 5; Zeros: -3; -i; -6+i f(x)=a( )

58. ## physics

Starting from rest, a 10.7 kg block slides 2.60 m down to the bottom of a frictionless ramp inclined 30.0° from the floor. The block then slides an additional 4.70 m along the floor before coming to a stop. (a) Determine the speed of the block at the

59. ## AlgebraB-2

A model rocket is launched from a roof into a large field. The path of the rocket can be modeled by the equation y = 0.04x+ 8.3x + 4.3, where x is the horizontal distance, in meters, from the starting point on the roof and y is the height, in meters, of

60. ## Life orientation

3 environmental health hazard that cause ill health, crises and disasters

61. ## maths

how can i find a general solution of g(x)when they give me g(X) =cos (x+30)and g(X)= -2sinx

62. ## chemistry

How many grams of ZnCl2 will be produced from 48 grams of zinc and 30 grams of HCL

solve 10(x+5)=130

64. ## physics

A 2.6-kg particle moving along the x axis has a velocity of +1.7 m/s as it passes through the origin. It is subjected to a single force, Fx, that varies with position, as shown below.

65. ## Use the intermediate value

Use the intermediate value theorem to show that the polynomial function has a zero in the given interval. f(x)=4x^3+6x^2-7x+1; [-4,-2] f(-4)=

66. ## History of Puerto Rico

Need info in English on biographies of political and cultural leaders of Puerto Rico between 1850-1950

67. ## Physics

Your artist friend's new work is a simple, high-impact kinetic sculpture called 'Destruction.' A 200-kg steel block is hung from the ceiling by an 8-foot-long rope. A second rope is attached to the side of the block. The other end of this second rope is

How would you go about making 250ml of a 20X stock solution of NaCl to dilute later to a final concentration of 50mM? I know that the molecular weight of NaCl is 58.44 but I am not sure where to start. I need to figure out the amount of NaCl and water

69. ## Math Ms. Sue please

1. Given the altitude of lakes in feet: –12, –9, –14, –39, –49, –49, –18, –43, find the mean, median, mode, and range. (1 point) mean = –28.5, median = –29.1, mode = –49, range = 40 mean = –29.1, median = –49, mode = –28.5,

70. ## Chemistry

Enough of a monoprotic acid is dissolved in water to produce a 0.0190 M solution. The pH of the resulting solution is 2.33. Calculate the Ka for the acid.

71. ## Physics

The Navy wants a new airplane launcher for their aircraft carriers that is basically a large spring and your job is to determine the necessary spring constant. The launcher pushes the plane for a short distance along a much longer runway. During that same

72. ## Physics

At the State Fair you see people trying to win a prize at a game booth. They are sliding a metal disk shaped like a puck up a wooden ramp so that it stops in a marked zone near the top of the ramp before sliding back down. You estimate that you can slide

73. ## math

In factoring ax^2 + bx + c, what are the steps in finding the unknown "b"?

74. ## NEEDS TO BE TURNED IN IN 5 MINUTES!! HELPPPP

find y' if arctan(xy)=6+(x^4)y

75. ## History

which native american tribes called New Mexico their home?

76. ## chemistry

85.0 of is initially at room temperature (22.0). A chilled steel rod at 2.0 is placed in the water. If the final temperature of the system is 21.2, what is the mass of the steel bar? Specific heat of water = 4.18 Specific heat of steel = 0.452 My answer

77. ## math

for the given functions f and g, find the specified value of the following functions and state the domain of each one. f(x)=2+3/x; g(x)=3/x a.(f-g)(2)= b.(f/g)(3)= how do I do this? I need help! it throws me off because of it being in fraction form.

78. ## geometry

what is tan-1 3.5= to

79. ## Statistics

A standard deck of 52 playing cards is composed of 4 suits. Each mix contains 13 cards. Jacks, Queens, and Kings are considered face cards. Assume three cards are selected without replacement. Calculate the probability of drawing two hearts, followed by a

80. ## chemistry

85.0 of is initially at room temperature (22.0). A chilled steel rod at 2.0 is placed in the water. If the final temperature of the system is 21.2, what is the mass of the steel bar? Specific heat of water = 4.18 Specific heat of steel = 0.452 My answer

81. ## Statistics

Use this information to calculate the mean and standard deviation of this random variable. P(x)- .25, .05, .55, .15

82. ## Math

Factor 4xsquared-36x+81=0

130. ## English

When there are thousands of written materials floating in cyberspace, what is the most important criterion to consider when choosing sources of information for your research paper? A. Relevant B. Current C. Famous author D. Impressive Web site is it A

131. ## math

and what would 0.1875 be as a fraction?

132. ## Find the complex zeros

Find the complex zeros of the polynomial function. Write f in the factored form. f(x)=x^3-3x^2+7x-5 f(x)=

133. ## chemistry

A generic salt, AB, has a molar mass of 293 g/mol and a solubility of 2.20 g/L at 25 °C. What is the Ksp of this salt at 25 °C?

134. ## chemistry

A generic salt, AB, has a molar mass of 293 g/mol and a solubility of 2.20 g/L at 25 °C. What is the Ksp of this salt at 25 °C?

183. ## Chemistry

Which precipitate should react when HCl is added? Give REASONS for your prediction. The anions i have are Co3 and SO4 i wrote none of them react with HCl. I don't know what to write for the reason though please help me woth this one. Thanks!!!!

184. ## math

-(-2)^0*(-2)^3*(-2)^-4/(-2)^3

185. ## multivariable calculus

Describe the level surfaces of g(x; y; z) = x2 - 2y2 + z2

186. ## multivariable calculus

Find the equation of the plane containing the points (1; 0; 0), (0; 2; 0) and (2; 1; 3).

187. ## multivariable calculus

Consider the surface given by the equation: 2x2 - 3z2 - 4x -4y - 12z + 2 = 0 (a) Write in standard form ) (b) Determine and classify the traces with planes parallel to the xy-, xz- and yz- planes. (c) Hence classify the surface.

188. ## Math

The interior dimensions of a chest are 4 feet length, 2 feet width and 3 feet height. How many 1-foot cubes could fit in the chest?

189. ## Calc.

A dog kennel owner needs to build a dog run (rectangular area) adjacent to a kennel cage (so that it is in the shape of a rectangle, but only three sides need to be built- one long side is already there). The short side walls of the run are to be cinder

194. ## Life orientation

Discribe the life style of cancer and explain 5(more) factors that contribute to the cancer

195. ## social studies

Were there any key events in Millard Fillmore's life that shaped their dream for the United States?

196. ## Math

Calculate the morality of a solution made by mixing 250ml of 0.75M H2SO4 with 400ml of 2.5MH2SO4

197. ## computer science

This week you will determine the time complexity for a game of your choice. You should select a game that can be played in algorithmic steps and determine the maximum time (in notation) it will take to play the game. Use the guidelines below in your

198. ## Math

Hiro went to the store after school to pick up groceries. His list said he needed to pick up one jug of milk, one loaf of bread, one dozen eggs and one package of cookies. Milk comes in 1%, 2% and 3.25% varieties. Bread comes in white and 100% whole wheat.

199. ## physics

How to calculate the series AC coupling capacitance? Is there an equation for this? Thank you for any help

200. ## maths

An iron rod when cut into pieces each of 30 cm length, a piece of 7 cm is left out. However, if each piece is of 28 cm length, a piece of 5 cm is left out. What is the length of the shortest such rod?

201. ## Science

Which part of an electric circuit resists the flow of charge when it changes electrical energy into other forms of energy? A. battery B. copper wires C. switch D. light bulb

202. ## geometry

The volume of a small circle is 10 cubic meters. Find the volume of the larger sphere in cubis meters.

203. ## math pre calculus

find the following for the function f(x)=(x+5)^2(x-2)^2 a.find the x and y intercepts, b.find the power function that the graph ressembles for large values of x c.determine the maximum number of turning points on the graph of f d.determine the behavior of

204. ## Algebra

As x ranges over all real values, what is the minimum value of f(x)=|x-123|+|x-456| + |x-789|

IN 10-15 LINES CRITICALLY DISCUSS 5 WAYS IN WHICH THE HUMAN OR ENVIRONMENTAL PROBLEM IMPARTS ON THE COMMUNITY .PROVIDE RELEVANT SOURCES TO SUPPORT YOUR CLAIMS

206. ## Pre-cal

Convert from DMS to Radians 1) 61degree 24' 2) 75degree 30' Convert from Radians to Degress 1) 2 2) 1.3 Please help how to solve and calculate it in calculator. I got confused. :( :)

207. ## Chemistry Solubility help!!!!!!!!!

INFORMATION: [HCl] = 0.1388 M We placed 0.5 g Ca(OH)2 in 100 mL of the following solutions: Flask A: Distilled Water (7.4 mL of HCl needed to titrate) Flask B: 0.05 NaOH (12.1 mL of HCl needed to titrate) Flask C: 0.025 NaOH (10.8 mL of HCl needed to

208. ## chemistry

Which 0.10M solution below has the lowest pH? a) NaCl b) KCN c) LiF d) RbClO e) all have the same pH​

209. ## HUMAN AND ENVIRONMENTAL

PROVIDE RECOMMENDATIONS ON HOW TO ADDRESS THE TOPIC THAT YOU IDENTIFIED IN THE PREVIOUS QUESTION

210. ## Algebra

What is the sum of all integer values of n satisfying 1 \leq n \leq 100, such that n^2 - 1 is a product of exactly two distinct prime numbers?

211. ## math

Paul grew an average of 1/2" a month last year. If he was 4' 6" tall at the beginning of the year, how tall was he at the end of the year?

company A makes boxes of crackers that contains a mean of 30 crackers with a standard deviation of 2 crackers. company B makes boxes of crackers that contains a mean of 24 crackers with a standard deviation of 2 crackers. what can be said about the boxes

213. ## English

"The song of Wandering Aengus" is a (n) ________poem. A: epic B: allegorical C: dramatic D: prose Answer : C ?

214. ## science

at a construction site a crane lifts a block of mass,m,vertically upwards through a height of 70 m at constant speed by means of a strong cable.The block experiences a force of magnitude 8 N as a result of air friction as it is lifted vertically upwards.

215. ## Calculus

What is the connection between improper integrals, Riemann sums, and the integral test?

216. ## Calculus-PLZ HELP! =)

does the sum 3/(2^(n)-1) converge or diverge? n=1--->infinity

217. ## math

find the area of a table top with 7/8 of a foot length and 3/5 of a foot wide.

218. ## English

The tone of "A smile" is ? A: Hopeful B: Cheerful. C: tense D: light Answer : D In "Boast Not , Proud English," the writer is protesting against: A: Prejudice B: Blasphemy C: Religion D: tolerance Answer: C ? In "Birches," Frost compares the broken ice

219. ## Physics

A 5.50-kg ball, moving to the right at a velocity of +2.35 m/s on a frictionless table, collides head-on with a stationary 7.60-kg ball. Find the final velocities of the balls if the collision meet the following conditions. (a) elastic 5.5-kg ball =

220. ## Algebra

a and b are digits such that \overline{120ab} is a multiple of 3, 5 and 7. What is the value of \overline{ab} ?

221. ## Algebra

Let N=11 ^ 2 \times 13 ^ 4 \times 17 ^ 6 . How many positive factors of N^2 are less than N but not a factor of N?

222. ## Physical Science

Which part of an electric circuit resists the flow of charge when it changes electrical energy into other forms of energy? A. battery B. copper wires C. switch D. light bulb i've posted this before but it's getting buried. i don't think its A or B.

223. ## Science

When hot magma rises toward the crust the process is called what

224. ## Algebra

Find the smallest positive integer N \neq 23 such that the fraction \frac {N-23} { 7N+6 } is not in simplest terms.

225. ## Use the rationals theorem

Use the rationals theorem to find all the zeros of the polynomial function. Use the zeros to factor f over the real numbers. f(x)=2x^3-x^2+2x-1

226. ## Algebra

Consider all 2 digit numbers N such that the last 2 digits of N^2 are N itself. What is the sum of all these 2 digit numbers?

227. ## math

solve the polynomial inequality and graph the solution set on a real number line. set in interval notation. x^3+2x^2-4x-8>0 I have been staring at this problem for the last 15 minutes because I just don't understand it, somebody please help me?

228. ## Geometry

When writing a math expression, any time there is an open bracket "(", it is eventually followed by a closed bracket ")". When we have a complicated expression, there may be several brackets nested amongst each other, such as in the expression (x+1)*((x-2)

229. ## algebra 1

which equation models an exponential decay y=1/4x500^x 1/3y=6x100^x y=0.5x8^x y=23x(1/2)^x y=0.004x2^x i think it is d

230. ## Pre-calculus

Convert from DMS to Radians 1)61degree 24' 2) 75degree 30' Convert from Radians to Degrees 1) 2 2) 1.3 Please Help me, just tell me how to solve them and do it in the calculator.

231. ## Geometry

Two points are chosen uniformly at random on the unit circle and joined to make a chord C_1. This process is repeated 3 more times to get chords C_2, C_3, C_4. The probability that no pair of chords intersect can be expressed as \frac{a}{b} where a and b

232. ## Math

6 quarters, 4 dimes, 3 nickels, 10 pennies. what is the probability you will get at least one of each coin in change of 1 dollar

233. ## Geometry

ABC is an isosceles triangle where AB = AC and BC = 60. D is a point on BC such that the perpendicular distance from D to AB and AC is 16 and 32, respectively. What is the length of AB?

234. ## Use the intermediate value

Use the intermediate value theorem to show that the polynomial function has a zero in the given interval. f(x)=9x^4-3x^2+5x-1;[0,1]

235. ## Math Ms. Sue please

9. Name the triangles that are classified by angles. (1 point) right, scalene, isosceles scalene, isosceles, equilateral acute, right, obtuse obtuse, isosceles, acute I chose the answer "scalene, isosceles, equilateral" but the correct answer is "acute,

236. ## Geometry

ABC is an acute triangle with \angle BCA = 35 ^\circ. Denote the circumcenter of ABC as O and the orthocenter of ABC as H. If AO=AH, what is the value of \angle ABC (in degrees)?

237. ## MATH

use the discriminant to determine whether the following equation have solutions that are : two different rational solutions : two different irrational solutions : exactly one rational solution : or two different imaginary solutions 7+5z^2=-8z

238. ## Geometry

Determine the number of subsets of A=\{1, 2, \ldots, 10\} whose sum of elements are greater than or equal to 28 .

239. ## calculus 1

differentiate x(x-3)^2 do I product and chain rule?

240. ## Physics. LAST PROBLEM!!

A small metal ball with a mass of m = 82.5 g is attached to a string of length l = 1.72 m. It is held at an angle of θ = 58.5° with respect to the vertical. The ball is then released. When the rope is vertical, the ball collides head-on and perfectly

241. ## Geometry

ABCD is a quadrilateral inscribed in a circle with AB = 1, BC = 3, CD = 4 and DA = 6. What is the value of \sec^2 \angle BAD?

242. ## science

should'nt i use the equation mgh+half mv^2before=mgh+half mv^2aftr?

243. ## grammar

I [ran] around the track four times at the previous football game. OR I [have run] around the track four times at the previous football game?

244. ## pre calculus

use the seven step method to graph the following rational function: f(x)=3x^2+x-4/2x^2-5x a. determine the symmetry of the function. b. find the x and y intercepts. c. find the verticle asymptote d.find the horizontal asymptote e.plot the points between

245. ## math

How many integers satisfy the inequality \left| \frac { 10(x+1) } {x^2 + 2x + 3 } \right| \geq 1?

246. ## Physics, so confused

A cart of mass M1 = 5.00 kg and initial speed = 3.00 m/s collides head on with a second cart of mass M2 = 3.00 kg at rest. Assuming that the collision is elastic, find the speed of M2 after the collision. I am not sure how to find this answer without

247. ## science

should'nt i use the equation mgh+half mv^2before=mgh+half mv^2aftr?.

248. ## Algebra

Given f(x) = (x-1)(x-2) + (x-2)(x-5) + (x - 3)(x-8), what are the sum of the roots of f(x)?

249. ## Trigonometry

If \cot \left(\sin^{-1} \frac{1}{5}\right) = m, what is the value of m^2?

251. ## Calculus

The volume of the 3-dimensional structure formed by rotating the circle x^2 + (y-5)^2 = 1 around the x-axis can be expressed as V = a\pi^2. What is the value of a?

252. ## Language Arts

pixie : giant :: kitten : lion Write the relationship phrase you used to complete this analogy.

253. ## College algebra

Form a polynomial f(x) with the real coefficients having the given degree and zeros. Degree 5; Zeros: -3; -i; -6+i f(x)=a( )

254. ## Maths

Solve for X: log4(3x-7)^2 = 10

255. ## Maths

Solve for x: 6log(x^2 +1) - x = 0

256. ## Math

Prove: If the hypotenuse and an acute angle of one triangle are congruent respectively to the hypotenuse and an acute angle of another right triangle, then the two triangles are congruent.

257. ## math

alicie plans to use a square iece of plywood forthe tabletop. She wants to put tiles on each outside edge of th taletop Each tile measures 2 inche by 2 inches of each outside edge of the tableop

258. ## Social Studies

How did social controls shape Japenese identity and citizenship. In your response be sure to discuss the areas of religion and class structure. Please help as I do not really understand the question

259. ## Maths

Slove for x: ln (x^2 -6x -16) = 5