Questions Asked onMarch 27, 2013

1. Chemistry

1. Which metal is the most easily oxidized? A.) highly active metal *B.) moderately active metal C.) slightly active metal D.) an inactive metal 2. What happens in a voltaic cell? *A.) Chemical energy is changed to a electrical energy. B.) Electrical

2. Math

Mr. Green teaches band, choir, and math. This year, he has 57 students that take at least one of his classes. He teaches band to 25 students. There are 48 students who take either band or choir or both. There are 9 students who take both math and choir

3. math

What percentage of the total students chose skateboarding? (1 point) 10% 20% 30% none of these if 2 bys and 1 girl chose skateboarding? What percentage of the boys chose walking? (1 point) 30% 45% 25% none of these

4. chemistry

write the ionic equation and the balanced net-ionic equation for the following equations: Al2O3(s) + 6 HCl(aq) = 2 AlCl3(aq) + 3 H2O(l) And H2SO3(aq) + 2 KOH(aq) = K2SO3(aq) + 2 H2O and 2 HC2H3O2(aq) + Ca(OH)2(aq) = Ca(C2H3O2)2(aq) + 2 H2O and the final

5. Trigonometry

Given \tan \theta = -\frac{4}{3}, where \frac{\pi}{2} < \theta < \pi, what is the value of \frac{1}{\sin \theta + \cos \theta}?

6. fgcu

More than a decade ago, high levels of lead in the blood put 88% of children at risk. A concerted effort was made to remove lead from the environment. Now, suppose only 12% of children in the United States are at risk of high blood-lead levels. (a) In a

7. sociology

In what way were Karl Marx and Charles Wright Mills alike in their thinking and understanding of society?

8. Physics

Kelly is driving a car with a mass of 800 kilograms in a south direction with a speed of 18 meters/second. Dominic is driving a truck with a mass of 1500 kilograms with a velocity of 15 meters/second to the east. They undergo perfectly inelastic collision.

9. Social Studies Ms. Sue please

Sorry there are so many questions!!!! 1. The economic centers of the Northeast are the region's __________. (1 point) farms fisheries forests cities 2. Two major ports in the South are ______________________. (1 point) Atlanta and Dalton Raleigh and Austin

10. Centroids and Triangles - determining perimeter?

Let G denote the centroid of triangle ABC. If triangle ABG is equilateral with side length 2, then determine the perimeter of triangle ABC. I drew the diagram, but it doesn't really help....

11. Math

For questions 4–5, use the following two ways to display the test scores received on Mr. Alexander's math test. Use these displays to solve each problem. Stem | Leaf 6 | 8 9 7 | 0 3 5 8 9 8 | 1 2 2 5 7 8 8 9 9 | 0 2 3 Pie Chart: 80-89= 44.4% 90-99=16.6%

12. chemistry

write and balance Solid aluminum carbonate decomposes to form solid aluminum oxide and carbon dioxide and carbon dioxide gas

13. Chemistry

You prepare a solution from 10.0 mL of 0.100 M MOPS buffer (3-morpholinopropane-1-sulfonic acid) and 10.0 mL of 0.071 M NaOH. Next, you add 1.00 mL of 1.89 × 10-5 M lidocaine to this mixture Denoting lidocaine as L, calculate the fraction of lidocaine

14. Chem

Calculate [H3O ], [ClO4–], and [OH–] in an aqueous solution that is 0.170 M in HClO4(aq) at 25 °C.

15. Calculus

Find constants a and b in the function f(x)=axe^(bx)such that f(1/7)=1 and the function has a local maximum at x=1/7. a = b =

16. Chemistry

A swimming pool, 20.0 m 12.5 m, is filled with water to a depth of 3.73 m. If the initial temperature of the water is 18.5°C, how much heat must be added to the water to raise its temperature to 28.5°C? Assume that the density of water is 1.000 g/mL.

Lara starts at the bottom of a long staircase. She climbs exactly 2/3 of the stairs. Then, she goes back down exactly 1/2 of the way to the bottom. From that spot, she climbs exactly 2/3 of the way to the top. Finally from there, she climbs 6 stairs to

18. physics

A boy is pushing his sled up a snowy slope. The sled has a mass of 20.4 kg and weighs 200 N. The boy pushes with a constant force of 75 N. The sled travels a distance of 10 m and gains 3 m in height. When the sled reaches the top, it is traveling 2 m/s.

19. math

A parallelogram has an area of 8x^2 - 2x -45. The height of the parallelogram is 4x + 9. I know the formula for a parallelogram is A=bh. Please work and explain how I get the length of the base of the parallelogram. Thanks

20. physics

While a roofer is working on a roof that slants at 45.0 degrees above the horizontal, he accidentally nudges his 94.0 N toolbox, causing it to start sliding downward, starting from rest.

21. physics

A child’s toy consists of plastic attached to a spring. The spring is compressed against the ﬂoor a distance of 2.55 cm, and the toy is released. The acceleration of gravity is 9.8 m/s 2 . If the toy has a mass of 116 g and rises to a maximum height of

22. 7th Grade Social Studies

1. Which statement best describes the government of Canada? (1 point) The monarch of Britain has total control over Canada. The Canadian parliament is ruled by the United States. Canada has complete power over its own government. The prime minister is the

23. ms. sue plz help

2. Read the following excerpt from “All Together Now”: What can parents do? We can put our faith in young people as a positive force. I have yet to find a racist baby. Babies come into the world as blank as slates and, with their beautiful innocence,

24. I would like to understand my calc homework:/

Consider the differential equation given by dy/dx=(xy)/(2) A) sketch a slope field (I already did this) B) let f be the function that satisfies the given fifferential equation for the tangent line to the curve y=f(x) through the point (1,1). Then use your

25. Chem

Calculate the work (in kJ) when 1.80 moles of methane react with excess oxygen at 389 K: CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) I got 11661.26 Calculate the change in entropy (in J/K) when 70.1 g of nitrogen gas is heated at a constant pressure of 1.50 atm

26. Unknow

A man has a rectangular garden. One length of the garden lies along a patio wall. However the rest of the garden is enclosed by 32 feet of fencing. If the length of the garden is twice its width, what is the area of the garden.

27. Physics

The pressure increases by 1.0 x 104 N/m2 for every meter of depth beneath the surface of the ocean. At what depth does the volume of a Pyrex (bulk modulus 2.6 x 1010 N/m2) glass cube, 2.9 x 10-2 m on an edge at the ocean's surface, decrease by 9.5 x 10-10

28. math

An open box is made from a rectangular piece of cardboard measuring 16 cm by 10cm. Four equal squares are to be cut from each corner and flaps folded up. Find the length of the side of the square which makes the volume of the box as large as possible. Find

29. Chemistry

When a 5.00-g sample of KCl is dissolved in water in a calorimeter that has a total heat capacity of 3.978 kJ·K–1, the temperature decreases by 0.290 K. Calculate the molar heat of solution of KCl.

30. Science ASAP please

1. Which of these sources of energy is NOT renewable? (1 point) wind solar power hydroelectric power natural gas 2. Air can be polluted by ____. (1 point) tiny particles of soot carbon monoxide sulfuric acid all of the above 3. Which of the following can

31. chemistry

Calculate the solubility of Mn(OH)2 in grams per liter when buffered at each of the following. (a) pH 7.7 (b) pH 9.6 (c) pH 11.3

32. physics

We are given an input current Iin=100μA and a linear resistive load represented by the resistor RL . Our resistive load is not regulated for the high current provided by our current source, so we add a resistor RS in parallel to divide the current such

33. Microbiology

You need to make 20ml of a 20% glucose solution. The M.W. of glucose is 180.16. How would you accomplish this: Glucose _______g Pure Water _______ml

34. Physics

A 85-kg snow skier is being pulled up a 17 ° slope by a steel (Young's modulus 2.0 x 1011 N/m2) cable. The cable has a cross-section area of 7.4 x 10-5 m2. The cable applies a force to the skier, and, in doing so, the cable stretches by 2.6 x 10-4 m. A

35. chemistry

If material is lost from the crucible by spattering, what effect would this have on the mass of Sodium Chloride?decrease or increase

36. Englisj

1. Which of the following is NOT an example of persuasive writing? a position paper from an elected official a college admissions essay a movie review *a summary of a textbook reading assessment 2. Identify the following as a fact or an opinion: “Video

37. Chemistry

How many mL of .715 M HCI is required to neutralize 1.25grams of sodium carbonate? (Producing carbonic acid)

38. CHEMistry

A 2.50-g sample of powdered zinc is added to 100.0 mL of a 2.00-M aqueous solution of hydrobromic acid in a calorimeter. The total heat capacity of the calorimeter and solution is 448 J/K. The observed increase in temperature is 21.1 K at a constant

39. Alg I

Find a pair of factors for each number by using the difference of two squares. 84 55 80 Please explain. Thanks

40. math

The temperature in degrees Fahrenheit is equal to 32 more than 9/5 times the temperature in degrees Celsius. One day the high temp. was 95 degrees Fahrenheit. What was the high temp. in degrees celsius? I did 32+(9/5*35) 32+63=95 so my answer is 35 degrees

41. Chemistry

A student was synthesizing aspirin in the lab. Using the amount of limiting reactant, she calculated the mass of aspirin that should form as 5.24g. When she weighed her aspirin product on the balance, it mass was 2.23g. What is the percent yield of the

42. Chemistry titrations

25.00mL of an unknown sulfuric acid solution is titrated to the second equivalence point with 21.02mL of 0.420M potassium hydroxide solution. What is the concentration of the sulfuric acid solution?

43. statistics

suppose we went to test the claim that the average GPA of all students in this university is at least 2.8. however , from out class with 25 students, we find the average GPA is only 2.7 with standard deviation 0.35. can we reject the claim with

44. physics

An archer puts a 0.26 kg arrow to the bowstring. An average force of 184.5 N is exerted to draw the string back 1.26 m. The acceleration of gravity is 9.8 m/s 2 . Assuming no frictional loss, with what speed does the arrow leave the bow? Answer in units of

45. Chemistry

1. Which metal is the most easily oxidized? A.) highly active metal *B.) moderately active metal C.) slightly active metal D.) an inactive metal 2. What happens in a voltaic cell? *A.) Chemical energy is changed to a electrical energy. B.) Electrical

46. Microbiology

You need 3.5L of 50mM NaCl from your 20X stock. How would you accomplish this: 20X stock __________ml Pure Water ___________ml From whatever number I plugged in trying to solve it, I got: 175ml of 20X stock and 3,430ml of Pure Water. Have no idea if those

47. algebra

The number of red beads sheila has is four times as many as the number of green beads she has .There are 75 red and green beads.How many red beads does sheila have?

48. English

From reading "Birches," we can conclude that the speaker is a(n): A: Boy B: Birch tree C: old man D: girl on her hands and knees Answer : A ? "Song" makes extensive use of : A: assonance B: personification C: rhyme D: onomatopoeia Answer: C "The creation"

49. Physics

Two positive point charges are placed on the x-axis. One, of magnitude 4Q, is placed at the origin. The other, of magnitude Q is placed at x=3 m. Neither charge is able to move. Where on the x-axis in meters can I place a third positive point charge such

50. chemistry

Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation: CO2(g) CO2 (aq) K=0.032 The acid dissociation constants listed in most standard reference texts for carbonic acid

51. Chemistry

How many milliliters of 0.291 M HCl would be required to titrate 6.83 g KOH?

52. German

Where is the non-modal second verb placed in a sentence? a. in the beginning b. second position c. at the end d. wherever you want to put it i feel like this is b but i'm not sure. :~(

53. Algebra

Five times the reciprocal of a number equals the sum of 3/2 the reciprocal of the number and 7/6. What is the number

54. Algebra

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

55. chemistry

When 1219 J of heat energy is added to 40.4 g of ethanol, C2H6O, the temperature increases by 12.3 °C. Calculate the molar heat capacity of C2H6O. (In J)

56. Chemistry

a chemist carries out the reaction of 0.250 mol of f2 with excess of cl2. At 250 degress C and 1.00 atm, what is the maximum volume of CLF3 in liters that the reaction can produce?

57. math

Suppose z is a complex number such that z^5 = -\sqrt{3} + i and z = \sqrt{2} ( \cos n^{\circ} + i \sin n^{\circ}) , where 270 < n < 360 . Find the exact value of n .

58. college algebra

P=t^2-35t+300 the profit made when t units are sold t>0, is given by P=t^2-35t+300. Determine the number units to be sold in order for P

59. Physics

An 80 kg man is riding in an elevator from the first floor to the 34th floor. The elevator and man are moving at a constant speed. What is the net force on the man in Newtons (g=9.8)

60. Physics

Two astronauts, each having a mass of 61.9 kg, are connected by a 14.7 m rope of negligible mass. They are isolated in space, orbiting their center of mass at speeds of 5.57 m/s. Calculate the magnitude of the initial angular momentum of the system by

74. economics

Keogh and Ira plans allow people to do sll the following except

75. Trigonometry

If cos(a)=1/2 and sin(b)=2/3, find sin(a+b), if 1) Both angles are acute; Answer: (sqrt(15)+2)/6 ii) a is an acute angle and pi/2 < b < pi; Answer: (2-sqrt(15))/6 2. Find the exact value of the six trigonometric functions of 13pi/12. Partial answer:

76. 5th grade math (word problems)

I'm not sure how to solve this problem. I know that i need to divide 36 cookies. But not sure how to figure out the number of groups. Am i using multiples of 4? Marie made 3 dozen cookies. She needs to dived them evenly into groups greater than 4. What are

185. Biology (dilutions)

This is the homework exercise: You want to add 0.13 ul of DNA to 4.87 ul of extraction mix to have a final total of 5.0 ul of sample. But you don't want to make 0.13 aliquots because it is too small. Make a dilution to accomodate for the small aliquot. Any

186. College Algebra

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

187. Physics Oasis!! Help!!

A fully loaded Cessna-182 airplane of mass 1250 kg has an engine failure when flying with an airspeed of 129 km/h at an altitude of 2670 m on a calm day. It then glides at a constant glide angle (which is the direction of flight below the horizontal)

188. math

The point (5, -7) is dilated by a scale factor of 4 about the origin. Find the location of the new point. Show your work.

189. Biology

This is the homework exercise: You want to add 0.13 ul of DNA to 4.87 ul of extraction mix to have a final total of 5.0 ul of sample. But you don't want to make 0.13 aliquots because it is too small. Make a dilution to accomodate for the small aliquot. Any

190. Maths

The value of y that minimizes the sum of the two distances from (3,5) to (1,y) and from (1,y) to (4,9) can be written as a/b where a and b are coprime positive integers. Find a + b.

191. Life orientation

What is basic conditions of employment act

192. analyze the graph of the function

analyze the graph of the function R(x)=x^2-12/x-6 a) What is the domain of R(x)? b) What is the equation of the vertical asymptotes of R(x)? c) What is the equation of the horizontal or oblique asymptote of R(x)?

193. science

32g of KCI OR KCIO3 IN 100ML OF WATER, AT WHAT TEMP WOULD IT BECOME SATURATED.. WHAT IF IT IS 37g? Thank you

194. Math

The popcorn booth serves tubs that weigh 3/74 of a pound. Mrs. Taylor has a box that weights 6 ponds. How many tubs can she make from the box?

195. english

For the speaker in "Local Sensibilities,"pineapples represent: A: His favorite food. B: A Thanksgiveing ham. C: tourists D: work. Answer: B ?

196. Calculus

Let N = \int \int \int_B xyz^2\ dV , where B is the cuboid bounded by the regions 0 \leq x \leq 1, -1 \leq y \leq 2 and 0 \leq z \leq 3. If N = \frac{a}{b}, where a and b are coprime positive integers. What is the value of a+b?

197. Physics

Two parallel wires carry 1-A currents in unknown directions. The distance between the wires is 10-cm. What is the magnitude of the magnetic field B in Teslas at a point P located 6-cm away from the axis of one of the wires and 8-cm away from the axis of

198. Algebra

The value of y that minimizes the sum of the two distances from (3,5) to (1,y) and from (1,y) to (4,9) can be written as \frac{a}{b} where a and b are coprime positive integers. Find a + b

199. math

How do you do the math for the problem 14 - 7 × 2

200. College algebra

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)=7x^3-x^2+7x-1

201. algebra

Find the sum of all positive integers b such that b^2=a^3+1, where a is a prime number.

202. Physics

A spring is compressed 12 cm. A 100-g block is placed against the spring. When the block is released, the block rises 2.0 m up the slop. Neglect friction. What is the spring constant of the spring?

203. Geometry

The value of y that minimizes the sum of the two distances from (3,5) to (1,y) and from (1,y) to (4,9) can be written as \frac{a}{b} where a and b are coprime positive integers. Find a + b.

When an object is placed 55.0cm from a certain converging lens, it forms a real image. When the object is moved to 45.0cm from the lens, the image moves 6.00 cm farther from the lens. Find the focal length of this lens? Please someone help me out I tried

205. college algebra

Solve the equation. How do you solve a fraction? X^2/3=1/16 Thanks

206. math

use the rational zero theorem to find all the real zeros of the polynomial function. use the zeros to factor f over the real numbers: f(x)=4x^4+9x^3+30x^2+63x+14 I cant even find sample problems to help me figure this out. help me please?

207. English

In "Creation," the poet says that god is like: A: a living man B: the darkness and the light C: a mother bending over her child D: some creature made of clay Answer : A In the Odyssey, the cyclops is compared to a shaggy mountain to emphasize his: A:

208. ellipses

Given an ellipse; 3x^2+5y^2-12x-50y+62=0, find the Center, the Major Axis, the Minor Axis, & the distance from C to Foci?

209. college algebra

√3x+7=3x+5 How do I solve when the answer is -1?

210. Math

Order fractions 3/6 5/6 4/10 from greatest to least

211. maths

What is the sum of all integer values of n satisfying 1≤n≤100, such that n2−1 is a product of exactly two distinct prime numbers?

asked by number theory
212. pre calculus

find the average rate of change of f(x)=x^3-5x+3: a. from -6 to -3 b. from -1 to 2 c. from 2 to 8 I am so lost, can someone please show me how to do this?

213. math

A Triangle has sides 4,8,and 11. In a similar triangle the shortest side is 8 and the longest side is x. a) Write a proportion that models the situation. b) Solve the proportion for x.

214. HELP WITH MATH PLEASE!!!!!!!!!!

What does 1/2 x 2 x 6 = ?

215. Math

Convert 2x-y>2 to slope intercept form.

216. PHYSICS PLEASE SOMEONE HELP ME OUT

When an object is placed 55.0cm from a certain converging lens, it forms a real image. When the object is moved to 45.0cm from the lens, the image moves 6.00 cm farther from the lens. Find the focal length of this lens? Please someone help me out I tried

Has anyone ever read the book tiger rising?

218. Math

(a+4)(2x-3)+(a+4)(3x+1)

219. History

In what three ways does the Constitution divide power?

220. math

the sum of five consecutive numbers is 28 more than the sum of the third and the fifth numbers.find the consecutive numbers

221. Physics

Airplanes are noisy things. For example, if you stand really close to a runway, a military jet can produce a sound intensity of about 100 W/m^2 at a distance of 30 m from the plane (this is beyond painful noise). You live near a military airport and want

222. Chemistry eq

How many milliliters of 0.430M hydrochloric acid (HCl(aq)) must be added to 15.00mL of 0.682M sodium hydroxide (NaOH(aq)) to reach the equivalence point?

223. chem

consider the system I2(g)+262 KJ ¡ê 2 I (g) at 1000¡ÆC. In which direction, if any, will the reaction proceed if gaseous iodine atoms are added, the system is compressed, the temperature is decreased, a catalyst is introduced, and gaseous idodine atoms

224. c-justice 200

Should judicial review be eliminated? Provide a detailed explanation for your answer. b) If judicial review were eliminated, what alternative means could be used to interpret the meaning of the Constitution?

225. History

What the positive and negative results of Spanish Exploration in California.

226. college algebra

Rational equation -5/x-3 - 3/x+3=2/x^2-9 how do I solve?

227. Math

Fence needs to be built for 6 children with 75 sq feet for each child. What would length and width be for fence in feet?

228. math

solve: 6 < x + 4 less than or equal to 11

229. algebra attn wayne

-5/x-3 - 3/x+3 = 2/x^2-9 You said to divide by 9 on both sides 9(x+3)-3(x+3)=2 9x+27-3+9=2 6x=36 6x=48 x=8 Is this correct? Thanks for your help.

230. university

prove 2 | n^2 + n + 1

231. Algebra

\begin{align} & (x-1)(x-2)(x-3) + (x-2)(x-3)(x-4) \\ + & (x-3)(x-4)(x-5) + (x-4)(x-5)(x-6) \\ + & (x-5)(x-6)(x-7) + (x-6)(x-7)(x-8) =0 ? \end{align}

232. Math

The face painting booth has 1/4 pint of paint. There are five students who want their faces painted. How much paint should we use for each child?

233. english

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

234. 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?

235. math

find the rule: X=8,9, 10,11,12 y=8,10,12,14,16

236. math

When lashone won a contest she got a silver medal with a diameter of 6 centimeters. What is the medals area?

237. Math

need help on this review question. Determine each sum by writing an equivalent numberical expression using Commutative and Associate properties. 3 + 9 + 7 + 6 For commutative could you just put 3 + 7+ 9 + 6? I'm confused on what do do for associative since

238. college algebra

Solve the equation. How do you solve a fraction? X^2/3=1/16 Thanks

239. math

On Friday, Lewis saw a certain number of hummingbirds, h. On Saturday, He saw 3 more than twice the number of hummingbirds he saw on Friday. Write an expression for the number of hummingbirds Lewis saw on Saturday.

240. Chemistry

Why can't NH_3_ donate a proton and act as a Bronsted-Lowry acid?

241. math

whats 4x+28=4(x+3)+16

242. math

5^0/5^-6 * 1/5^-11 / (5^2)^4/(5^10)^2

243. 10 grade algebra

please help with this problem Your dad is taking Biology as part of the veterinarian program at the local community college. This semester he will spend a total of 40 hours in the biology lab, and he will take notes in class 6 hours per week. Define a

244. algebra

6(15) + 40 = ?

245. Chemistry

How do I quickly identify whether or not a salt is soluble?

246. science

What is the formula for friction force

247. Science

A plane is flying 500mph east.The wind is blowing 50mph west.What is the netforce.Please help i need this question awensered by March 2013,31.

248. math

U.S. cement export date for the last 10 years in thousand tons: 746, 625, 633, 759, 803, 791, 743, 694, 738, 834 Find the mean number of tons exported for the period. I don't understand how to set this up.

249. Cal

lim_(x->0^+)(tan(9x))^x

250. math

The function f(x)=2x+8/3x-7 is one to one. Find its inverse, and check your answer. f^-1(x)= I haven't one clue how to do this...help me pleaaaase someone!

251. Math

(2x+1)(x-5)-(4x+2)(3x+7)+(1+2x)

252. ALGEBRA 2...

*Please explain on how to do each of these! 1. Let (x) be defined for all positive integer values of x as the product of all even factors of 4x. For example, (3)=12x6x4x2=576. What is the value of (5)? Someone says that it is f(5)= 20x10x2x4=1600 I DO NOT

253. Form a polynomial f(x)

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

254. Science

How is playing on a seasaw an example of the scientific definition of work

255. English

Q: What is the restroom at school called? Is it the boys' room or the girls' room? Is it the staff's room for teachers?

256. science

how do ear defneders work

257. Socials, 3 definitions

land being covered with thick moving ice is called what? northern or of the arctic/6 letters? a level bog or swamp found in canada/6 letters?

258. social studies

Can't unscramble 3 middle eastern names...ihaaBm, Bpsouors, hrpuitReE esavr

259. Form a polynomial

Form a polynomial f(x) with real coefficients having the given degree and zeros Degree 5; zeros: -8; -i; -8+i