Sunday

December 4, 2016
Total # Posts: 1,880

**chemistry **

how many grams of NaOh are needed to make 50 g of Na3PO4 according to the equation: 3NaOH+H3PO4=Na3PO4+3H2O (i'm not sure where to even start for this!)

*December 3, 2016*

**chemistry **

how many grams of NaOh are needed to make 50 g of Na3PO4 according to the equation: 3NaOH+H3PO4=Na3PO4+3H2O (i'm not sure where to even start for this!)

*December 3, 2016*

**Algebra **

A student has a mean score of 89 on 5 tests. what will be the new mean if she scores a 95 on the next test? (89+95)/6=X

*December 3, 2016*

**Algebra**

But I got 30.667 as my answer. So do I add that to the 89?

*December 3, 2016*

**Algebra **

A student has a mean score of 89 on 5 tests. what will be the new mean if she scores a 95 on the next test? (89+95)/6=X

*December 3, 2016*

**math**

Mileys music has a sale on music cds. All music Cds are discounTed 15%. mariana's receipt indicates that she saved $3 on her cd purchase. What is the full price of her music cd before discount

*November 30, 2016*

**physics**

Just like the efficiency can be used to tell how 'good' an engine is, the Coefficient of Performance can be used to compare refrigerators. If a refrigerator requires 1.21×104 J of work to remove 3.23×104 J of energy from the inside of a refrigerator, what ...

*November 28, 2016*

**Calc**

Use Stokes' Theorem to evaluate C F · dr where C is oriented counterclockwise as viewed from above. F(x, y, z) = xyi + 5zj + 7yk, C is the curve of intersection of the plane x + z = 8 and the cylinder x2 + y2 = 9.

*November 23, 2016*

**Calc**

Use Stokes' Theorem to evaluate C F · dr where C is oriented counterclockwise as viewed from above. F(x, y, z) = yzi + 9xzj + exyk, C is the circle x2 + y2 = 1, z = 3.

*November 23, 2016*

**Calc**

Evaluate the surface integral S F · dS for the given vector field F and the oriented surface S. In other words, find the flux of F across S. For closed surfaces, use the positive (outward) orientation. F(x, y, z) = xy i + yz j + zx k S is the part of the paraboloid z = ...

*November 23, 2016*

**American government **

How have NATO's operations changed over time ? A.) NATO only directs peacekeeping measures now B.) NATO no longer defends Western Europe C.) NATO has fewer member countries now than when it began D.) NATO's activities now include crisis management and peacekeeping ...

*November 21, 2016*

**physics**

A 3.35g lead bullet at 31.0°C is fired at a speed of 255 m/s into a large block of ice at 0°C, in which it embeds itself. What quantity of ice melts?

*November 17, 2016*

**MATH**

Find the area of the part of the plane with vector equation r(u, v) = <2 + v, u ? 7v, 5 ? 4u + v> that is given by 0 ? u ? 1, 0 ? v ? 1.

*November 16, 2016*

**MATH**

Find a parametric representation for the part of the cylinder y2 + z2 = 4 that lies between the planes x = 0 and x = 5. x = u y = 2cos(v) z = 0 ? v ? 2?

*November 16, 2016*

**MATH**

Find an equation of the tangent plane to the given parametric surface at the specified point. r(u, v) = u cos vi + u sin vj + vk; u = 7, v = ?/3

*November 16, 2016*

**MATH**

Its wrong Steve

*November 16, 2016*

**MATH**

Find the area of the surface. The part of the paraboloid z = x2 + y2 that lies inside the cylinder x2 + y2 = 4.

*November 16, 2016*

**chem**

A chemist is commissioned to produce twenty pallets of aspirin: C7H6O3 (salicylic acid) + C4H6O3 (acetic anhydride) ? C9H8O4 (aspirin) +C2H4O2 (acetic acid) Given a bottle contains 500 tablets (each containing 325 mg of aspirin). A case contains 144 bottles. A pallet contains...

*November 14, 2016*

**physics**

Blood flows in an aorta of radius 4.12mm at 35.0cm/s. Calculate the volume flow rate. Although the cross-sectional area of a capillary is much smaller than that of the aorta, there are many capillaries, so their total cross-sectional area is much larger. If all the blood from ...

*November 9, 2016*

**MATH *PLEASE HELP**

Use Green's Theorem to evaluate C F · dr. (Check the orientation of the curve before applying the theorem.) F(x, y) = y2 cos x, x2 + 2y sin x C is the triangle from (0, 0) to (1, 3) to (1, 0) to (0, 0)

*November 9, 2016*

**Math**

Consider F and C below. F(x, y, z) = (2xz + y2) i + 2xy j + (x2 + 15z2) k C: x = t2, y = t + 2, z = 3t ? 1, 0 ? t ? 1 (a) Find a function f such that F = ?f. f(x, y, z) = x2z+xy2+5z3+C Correct: Your answer is correct. (b) Use part (a) to evaluate C ?f · dr along the ...

*November 9, 2016*

**Math**

Determine whether or not F is a conservative vector field. If it is, find a function f such that F = ?f. If it is not, enter NONE. F(x, y) = (3x^2 ? 2y^2) i + (4xy + 2) j

*November 8, 2016*

**algebra**

you need an average of 88. you have scored an 85,90,80,94 on four out of five test. what must your score be on the 5th test to have an average of an 88??

*November 8, 2016*

**Calc**

A particle starts at the point (?3, 0), moves along the x-axis to (3, 0), and then along the semicircle y = sqrt(9 ? x^2) to the starting point. Use Green's Theorem to find the work done on this particle by the force field F(x, y) = <2x, x^3 + 3xy^2> .

*November 8, 2016*

**Math**

Use Green's Theorem to evaluate C (F · dr) (Check the orientation of the curve before applying the theorem.) F(x, y) = e^(2x) + x^(2)y, e^(2y) ? xy^2 C is the circle x^2 + y^2 = 4 oriented clockwise

*November 8, 2016*

**science**

what do mangroves ecosystem provide for organisms

*November 3, 2016*

**American Government **

How have NATO's operations changed over time ? A.) NATO only directs peacekeeping measures now B.) NATO no longer defends Western Europe C.) NATO has fewer member countries now than when it began D.) NATO's activities now include crisis management and peacekeeping ...

*November 2, 2016*

**Math**

Evaluate the line integral, where C is the given curve. (Integral)C z dx + x dy + y dz, C: x = t^4, y = t^5, z = t^4, 0 ? t ? 1

*November 2, 2016*

**Math**

Evaluate the line integral SC F · dr, where C is given by the vector function r(t). F(x, y, z) = sin x i + cos y j + xz k r(t) = t^4i ? t^3j + tk, 0 ? t ? 1

*November 2, 2016*

**Math**

Find the work done by the force field F(x, y, z) = <y + z, x + z, x + y> on a particle that moves along the line segment from (1, 0, 0) to (5, 2, 3).

*November 2, 2016*

**Science **

An object accelerates at 7.5m/s^2 with a force of 25N west being applied to it and there is a frictional force of 13N. What is the mass of the object

*November 1, 2016*

**Science **

If an object with a mass of 98kg at 2.5m/s^2, what amount of force is applied to it?

*November 1, 2016*

**Math**

STONE-GROUND FLOUR The radius of a milestone is 3 meters greater than the radius of another, and their areas differ by 15pi square meters. Find the radius of the larger milestone.

*November 1, 2016*

**American government **

I'm writing a paper explaining how the constitution and its european influences support our modern ideas about american citizenship and the rights and responsibilities of being a citizen Can someone help me like give me some ideas I'm stuck on this paper :/

*November 1, 2016*

**American government **

I really need help with these questions:( if anyone can I'd really appreciate it How have NATO's operations changed over time ? A.) NATO only directs peacekeeping measures now B.) NATO no longer defends Western Europe C.) NATO has fewer member countries now than when ...

*November 1, 2016*

**math**

the 12 oz can but I came out with a remainder when I divided not sure what I am suppose to do if I show a remainder

*October 26, 2016*

**math**

12 ounces of corn costs .59 16 ounces of corn costs .81 which is the better by .59/12=.04 .81/16-.05

*October 26, 2016*

**physics**

A block with a mass of 0.306 kg is attached to a spring of spring constant 444 N/m. It is sitting at equilibrium. You then pull the block down 4.50 cm from equilibrium and let go. What is the amplitude of the oscillation?

*October 26, 2016*

**math**

if a 12 ounce can of beans cost .59 how much does one ounce cost .59/12=.04

*October 26, 2016*

**physics**

A horizontal circular platform (m = 122.1 kg, r = 3.43m) rotates about a frictionless vertical axle. A student (m = 82.3kg) walks slowly from the rim of the platform toward the center. The angular velocity, omega, of the system is 2.9 rad/s when the student is at the rim. Find...

*October 25, 2016*

**Math**

How would you describe your understanding of rational numbers? (Select all that apply)

*October 23, 2016*

**physics**

A block of mass 0.49kg starts from rest at point A and slides down a frictionless hill of height h. At the bottom of the hill it slides across a horizontal piece of track where the coefficient of kinetic friction is 0.28. This section (from points B to C) is 3.60m in length. ...

*October 19, 2016*

**Physics**

A ball is thrown straight up at 45 m/s. How long will it take the ball to come back to its original height? Why?

*October 13, 2016*

**Algebra **

Solve the system by elimination -2x + 2y + 3z = 0 -2x - y + z = -3 2x + 3y + 3z = 5

*October 12, 2016*

**Algebra **

Can someone please help me I'd really appreciate it Solve the system by substitution -x - y - z = -8 -4x + 4y + 5z = 7 2x + 2z =4

*October 12, 2016*

**physics**

A 65.2 kg person jumps from rest off a 3.11 m-high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 1.08 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This ...

*October 6, 2016*

**physics**

On a frozen pond, a 13.9 kg sled is given a kick that imparts to it an initial speed of v0 = 1.81 m/s. The coefficient of kinetic friction between sled and ice is μk = 0.122. Use the work kinetic energy theorem to find the distance the sled moves before coming to rest.

*October 6, 2016*

**Algebra **

Solve the system by substitution: -4.5x-2y=-12.15 3.25x-y=-0.75

*October 6, 2016*

**Chemistry**

To prepare a solution of NaCl, you weigh out 2.634 (0.002)g and dissolve it in a volumetric flask whose volume is 100.00 (0.08) mL. Express the molarity of the solution, along with its uncertainty.

*October 2, 2016*

**Math**

In Cathy's garden 5/6 of the area is planted with flowers. Of the flowers, 3/10 of them are red. What fraction of Cathy's garden is planted with red flowers?

*September 27, 2016*

**Chemistry**

A 635 mL solution of HBr is titrated with 0.51 M KOH. If it takes 1569 mL of the base solution to reach the equivalence point, what is the pH when only 141 mL of the base has been added to the solution?

*September 27, 2016*

**physics**

Block A (Mass = 5.195 kg) and Block B (Mass = 3.330 kg) are attached by a massless string as shown in the diagram. Block A sits on a horizontal tabletop. There is friction between the surface and Block A. The string passes over (you guessed it) a frictionless, massless pulley...

*September 21, 2016*

**Science**

The density of steel metal is 7.81g/cm3.

*September 20, 2016*

**physics**

Two ropes are pulling upward on a large crate. The weight of the crate is 458 N. The tension in the left rope is the same as the tension in the right rope.If the crate is accelerating upward at a rate of 1.95 m/s2, and the tension in the two ropes is the same, what is the ...

*September 19, 2016*

**physics**

Determine the direction of frictional forces (left, right, up down) for the objects: 1) A cup resting on top of a car. The car is moving and accelerating to the right. 2) A block being pushed to the right up an incline. 3)A block being placed at the middle of an incline (slope...

*September 14, 2016*

**Math**

Create a story problem (scenario) that could be solved using the expression:1 1/2

*September 13, 2016*

**Alg**

A charter boat travels at a maximum rate of 25 mph. The function d(x) = 25x represents the distance d(x),in miles, that the boat can travel in x hours. The charter boat travels a maximum distance of 75 miles from the shore.

*September 10, 2016*

**Alg**

Find a reasonable domain and range for each function- A charter boat travels at a maximum rate of 25 mph. The function d(x) = 25x represents the distance d(x),in miles, that the boat can travel in x hours. The charter boat travels a maximum distance of 75 miles from the shore

*September 10, 2016*

**Alg**

A charter boat travels at a maximum rate of 25 mph. The function d(x) = 25x represents the distance d(x),in miles, that the boat can travel in x hours. The charter boat travels a maximum distance of 75 miles from the shore.

*September 10, 2016*

**Alg 1**

To earn a B in your Algebra class, you must achieve an unto under test average between 84 and 86 (inconclusive). You scored 86,85, and 80 on the first three tests of threading period. What possible scores can you earn on the fourth and final test to earn a B in the course?

*September 7, 2016*

**American Government**

Oh okay thank you

*September 4, 2016*

**American Government**

Or would it be A since the national and state share power

*September 4, 2016*

**American Government**

Would it be D?

*September 4, 2016*

**American Government **

why does federalism create tension between state and national governments? A.) Both national and state governments share power. B.) state and local governments have no support from national government C.) states are not able to work with each other D.) the national government ...

*September 4, 2016*

**American government **

How does the 10th amendment shown below demonstrate a constitutional provision for limiting government? The powers not delegated to the United States by the Constitution, nor prohibited by it to the states, are reserved to the states respectively, or to the people. A.) It ...

*September 1, 2016*

**American government**

1. Was c not D

*September 1, 2016*

**American government**

Thank you so much

*September 1, 2016*

**American government **

1.) Which of the following is true about the formal amendment process for the Constitution? A.) Any citizen may propose an amendment. B.) only Congress may propose an amendment. C.) both houses of Congress must pass a resolution to propose an amendment. D.) the president can ...

*September 1, 2016*

**college physics**

A student observes 30 waves traveling down a string in a lab experiment. It takes 10 seconds for the waves to all go by. What is the frequency of the waves (in Hz)?

*July 25, 2016*

**College physics**

Please help me... I have no idea where to begin...A tone of 4000 Hz is being played on a tuning fork. You run toward the tuning fork at 5 m/s. What frequency do you hear? Take the speed of sound to be 343 m/s.

*July 25, 2016*

**Economics - PLEASE HELP**

We don't have a text. It's an online class and we never learned any of this. Thanks, though.

*July 13, 2016*

**Economics - PLEASE HELP**

So.. Here's my second try: 1. C 2. A 3. B 4. A 5. B Are these right?

*July 13, 2016*

**Economics - PLEASE HELP**

Homework Help: Economics PLEASE CHECK MY ANSWERS! 1. The MAIN advantage to a corporation is.. A. Ease of entry B. Limited liability for the owners C. Dividends all go to one person D. Owners share managerial duty E. All of the above (My answer: E) 2. The MAIN advantage to a ...

*July 13, 2016*

**physics**

A conductor of length 2m carries a current of magnetic field of magnetic flux density 0.5T. The maximum force acting on it is ?

*July 12, 2016*

**math**

volume of equilateral triangle with and area of 6 sq inches and height of 15 inches

*July 11, 2016*

**Math**

Find the future value of an ordinary annuity of $70 paid quarterly for 5 years, if the interest rate is 10%, compounded quarterly. (Round your answer to the nearest cent.)

*June 29, 2016*

**stats**

1. Suppose that you are taking a quiz of 6 multiple- choice questions (the instructor chose the questions randomly), each question having 6 possible responses. You did not study at all for the quiz and will randomly guess the correct response for each question. The random ...

*June 27, 2016*

**Travel and Tourism**

What is the most successful marketing strategy for Travel Agents and Tour Operators?

*May 29, 2016*

**Math **

How do I use the distributive property to rewrite the math problem 5(4 - y?

*May 28, 2016*

**Math**

Rhonda bought a new jacket that originally cost $80. It was on sale for 20% off. The store charges a 6% sales tax. what is the total cost for jacket?

*May 10, 2016*

**Chemistry**

A 0.18 g sample of unknown was placed in a flask and dissolved in 125 mL of deionized water. A solution of HCl (0.13 M) was used to titrate the sample, and 16 mL was required to reach the endpoint. What is the formula weight of the unknown?

*April 24, 2016*

**Algebra**

Please help ASAPPP!!!! I have no idea how to even start on this! f(x)=9x^3+2x^2-5x+4 and g(x)=5x^3-7x+4. What is f(x)-g(x)? Show all of your steps and wrote your final answer in factored form. If someone could help me work through this problem that would be great!

*April 20, 2016*

**physics**

Two electrically-charges spheres are suspended from insulated threads a certain distance from each other. There is a certain amount of electrostatic force between them. Describe specifically (not just increase or decrease) what happens to this force in each of the scenarios ...

*April 9, 2016*

**History**

C: the value of paper money decreased, leading to inflation

*April 4, 2016*

**Math**

Company A charges $5 plus $0.10 per kilometre, company B charges $1 plus $.50 per km how far could you go and still pay less then company A? you need to use a inequality is what the teacher said

*April 3, 2016*

**Science**

The water in a puddle has a mass of 1500 grams. The sun comes out and the puddle evaporates. How many grams of water vapor enter the air from the puddle?

*March 31, 2016*

**Math**

What is the largest whole number that will round up or down to 900900900 if we're rounding to the nearest hundred

*March 22, 2016*

**Math**

please show me how to do this... A statement Sn about the positive integers is given. Write statements S1, S2, and S3, and show that each of these statements is true. Show your work.Sn: 12 + 42 + 72 + . . . + (3n - 2)2 = n(6n^2-3n-1)/2 Also, please show ...

*March 14, 2016*

**chemistry**

at certain altitude in the upper atmosphere, the temperature is estimated to be -100 degree celsius and the density just 10^-9 that of the earth's atmosphere at STP. Assuming a uniform atmosphere at STP. Assuming a uniform atmospheric composition, what is the pressure, in ...

*March 14, 2016*

**calculus**

Find the point on the line –3x+4y–5=0 which is closest to the point (0–5)

*March 10, 2016*

**Math**

Eric's notebook has 30 pages he wants to number all the pages beginning with 1 how many digits will he write when he writes in his notebook

*March 9, 2016*

**Chem**

The three substances that can reduce Ag+ to Ag, but will not reduce Sn2+ to Sn are Zn Pb H2 Mg Cu I2 Al Ca

*March 1, 2016*

**chemistry**

The three substances that can reduce Ag+ to Ag, but will not reduce Sn2+ to Sn are Zn Pb H2 Mg Cu I2 Al Ca

*March 1, 2016*

**Finite**

Kane Manufacturing has a division that produces two models of hibachis, model A and model B. To produce each model A hibachi requires 3 lb of cast iron and 6 min of labor. To produce each model B hibachi requires 4 lb of cast iron and 3 min of labor. The profit for each model ...

*March 1, 2016*

**Algebra**

The lighting for a billboard is provided by solar energy. If 6 energy panels generate 10 watts of power, how many panels are needed to provide 550 watts of power?

*March 1, 2016*

**Chemistry **

The three substances that can reduce Ag+ to Ag, but will not reduce Sn2+ to Sn are Zn, Pb, H2, Mg, Cu, I2, Al, Ca

*February 29, 2016*

**Calculus**

thank you very much! It has taken me almost 2 hours to do this

*February 26, 2016*

**Calculus**

Water is leaking out of an inverted conical tank at a rate of 13500.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 12.0 meters and the diameter at the top is 5.5 meters. If the water level is rising...

*February 26, 2016*

**Chemistry **

2NO + O2 yield 2NO2 Suppose that a particular moment during the reaction nitrogen monoxide (NO) is reacting at the rate of 0.074 M/s -1. At what rate is NO2 being formed?

*February 10, 2016*

**algebra **

The sum of two and the product of one and a number xx.

*February 8, 2016*