Monday

January 16, 2017
Number of results: 70,335

**Spanish**

I posted this yesterday and didn't get help. Now it is buried on the 3rd page. I am posting again. I hope that is ok. Are these correct? Complete the following statements with the correct form of the verb in parentheses. Some will be conjugated, while others will be left in ...

*January 16, 2014 by James*

**Grammar**

Which type of sentence is the following? The abdomen was hard and firm, nonreducible, there were no bowel sounds within the hernia. A) correct sentence B) run-on sentence C) sentence fragment I answered B the sentence makes no sense to me should there at least be "and" to ...

*November 19, 2012 by Marie*

**STAT- important**

What is the difference between normal distribution and approximate normally. Correct me if im wrong but I think the parameters of Normal is X~Normal (mu, standard deviation) but then approx. normal is X~Normal (mu, variation) im just really confused when you use each and such.

*December 18, 2014 by Sarah*

**stats**

for some independent data using the mann whitney test group a has rank sum of 97.5 with group size = 9 group b has a rank sum of 92.5 with a group size of 10 from the data table i have the two critical values for p=0.05 are 65 and 115 i know im supposed to compare them and ...

*May 29, 2010 by jessie *

**statistics**

for some independent data using the mann whitney test group a has rank sum of 97.5 with group size = 9 group b has a rank sum of 92.5 with a group size of 10 from the data table i have the two critical values for p=0.05 are 65 and 115 i know im supposed to compare them and ...

*May 29, 2010 by jessie *

**CHEMISTRY**

At a certain temperature , 0.960 mol of SO3 is placed in a 3.50 L container. 2SO3 ----> 2SO2 + O2 At equilibrium , 0.190 mol of O2 is present. Calculate kc. i know that it starts off by 2SO3 -----> 2SO2 + O2 I 0.960 0 0 C -2x +2x x _____________________ E 0.58 3.8 0.190 ...

*October 10, 2011 by Alexis Moran*

**chemistry**

How much concentrated hydrochloric acid solution 36% HCL by mass d=1.18g/ml in milliliters is required to produce 11.0L of 0.296 M HCL? My calculation 1.18 x 1000ml x 0.36/36.5 = 11.6M 11.6M = 11000ml x 0.296 11.6m = 3256ml x= 3256ml/11.6 x= 280ml. I am not sure the right ...

*July 29, 2012 by Fai*

**7th Grade Lit**

What is the complement of: a) "The snake looks hungry." b) "The lizard seemed stunned." c) "Its skin is scaly." d) "Scales cover a snakes body." e) "John will feed Izzy." f) "We will photograph Mary." g) "It feels sticky." answers a) hungry b) stunned c) scaly d) not sure e) ...

*September 12, 2012 by completeidiot*

**Chemistry**

I am working a question...... I am not sure how to go about solving this or working it out. The class is online. Can some explain how to go about doing this. Thank you greatly :) How much heat does your body lose when 2.60g of sweat evaporates from your skin at 25C? (Assume ...

*March 21, 2013 by STAT*

**Organic Chemistry **

One sample that is 1mm in height has a melting point range of 200-201. What would be the melting point range of a 10mm sample in height if both samples heating rate is 2 degrees Celsius per minute? I'm thinking it would be about 2000-2010 but I'm not fully sure. I used algebra...

*September 23, 2016 by Karnvir*

**calculus**

I have a caternary arch kiln. the inside base, is 4 feet. The apex of the inside parabolic arch is four feet. How many feet is the inside of the kiln?

*May 7, 2011 by Marcus Davis*

**calculus**

f(1)= 20, f(3)=13, f(5)=15, f(7)=16, f(9)=11, on [0,6] a, used midpint rule with n=5 to estimate intergral form 0 to 10 f(x)dx b, use trapezoidal rule with n=4 to estimate intergral from 1 to 9 f(x)dx c, used simpson's rule with n=4 to estimate intergal from 1 to 9 (x)dx

*December 12, 2011 by kyle*

**Calculus - Limits. Check my answer, please! :)**

Suppose that h(x)={x^2-x+5 if x<2 {5 if x=2 {x^3-1 if x>2 Which of the following is equal to 7? I. lim h(x) x->2- II. lim h(x) x->2+ III. lim h(x) x->2 I only II only ***III only I and II only I, II, and III

*October 6, 2013 by Samantha*

**Calculus**

Determine whether the series is convergent or divergent. If it is convergent, find its sum. If it is divergent, enter NONE. sum from 1 to infinity of (5^n+4^n)/20^n It is convergent, but I do not know how to find the sum.

*April 3, 2014 by Sandy*

**Calculus**

Calculate μ and σ, where σ is the standard deviation, defined by the following. σ^2 = integral between (−∞,∞) (x-μ)^2 p(x) dx The smaller the value of σ the more tightly clustered are the values of the random variable X about the...

*November 22, 2015 by Anonymous*

**Calculus**

Calculate μ and σ, where σ is the standard deviation, defined by the following. σ^2 = integral between (−∞,∞) (x-μ)^2 p(x) dx The smaller the value of σ the more tightly clustered are the values of the random variable X about the...

*November 22, 2015 by Christina*

**Calculus**

The Question: A particle moves along the X-axis so that at time t > or equal to 0 its position is given by x(t) = cos(√t). What is the velocity of the particle at the first instance the particle is at the origin? So far I was able to determine that the velocity of the ...

*December 27, 2016 by Stephen*

**12th Grade Calculus**

1. a.) Find an equation for the line perpendicular to the tangent curve y=x^3 - 9x + 5 at the point (3,5) [* for a. the answer that I obtained was y-5 = -1/18 (x-3) ] b.) What is the smallest slope on the curve? At what point on the curve does the curve have this slope? c.) ...

*November 28, 2010 by Eliza*

**calculus**

A stone is dropped from the upper observation deck (the space deck) of the CN Tower, 450m above the ground. (a) How long does it take the stone to hit the ground? (b) If the stone is thrown downward with a speed of 5m/s, how long does it take to reach the ground?

*December 2, 2010 by beatriz*

**Pre-Calculus**

Two barges are pulling a ship into the harbor. Barge A is pulling with a force of 2700N at N43 deg E, and barge B is pulling at S 50 deg E. What force must barge B exert so that the ship is pulled directly East?

*May 2, 2011 by Joe*

**calculus 2 **

Justify, with a written explanation or a mathematical reasoning and with a sketch of at least two different cases, the following properties of integrals: a) If f(x) is less than or equal to g(x) for a<=x<=b then integrate from a to b of f(x)dx is less than or equal to ...

*September 12, 2012 by bobby*

**Pre Calculus**

Having trouble verifying this identity... cscxtanx + secx= 2cosx This is what I've been trying (1/sinx)(sinx/cosx) + secx = 2cosx (1/cosx)+(1/cosx) = 2 cosx 2 secx = 2cosx that's what i ended up with, but i know it's now right. did i mess up with the algebra?

*April 11, 2013 by Alex*

**Calculus**

A ladder 30 ft. long is leaning up against a building. If the top of the ladder is being pulled up the wall of the building at a rate of 1.5 feet per minute, find the rate at which the base of the ladder is moving toward the building when it is 18 feet from the wall.

*June 15, 2015 by Alex*

**Calculus**

Find the specific solution of the differential equation dy/dx = 4y/x^2 with condition y(−4) = e. y equals negative 1 minus 4 divided by x <- my answer y equals negative 1 times e raised to the 1 over x power y equals e raised to the negative 4 over x power None of these

*March 11, 2016 by nan*

**chemistry**

What are the parameters of a sample of gas that are all interrelated and affect each other when any one of them changes? A. Pressure, volume, number of moles, and temperature B. Shape, hardness, transparency, and odor C. Mass, density, color, volume, and pressure D. ...

*March 24, 2015 by Cortney*

**Chemistry **

The densities of three solutions with known concentrations ( 20% , 50%, and 70%), and one unknown solution were determined. If the densities of 20%, 50% and 70% solutions are 0.69 and 0.58 and 0.49 g/mL, respectively, and the denisty of the unknown solution is 0.50 g/mL, what ...

*September 21, 2015 by Marci*

**Chemistry **

I Just don't know what to do, I think I understand, but im not sure because all of the compounds are liquid. I would know how to do it if they were aqueous, and just the water is liquid, but they are all liquid. Determine the acid dissociation constant for a 0.10 M acetic acid...

*October 18, 2016 by Bailey*

**social studies(check answers)**

please check my answers and if there wrong maybe you could tell me the correct one.but thanks anyways. 1. How did the formation of the National Action Party change Mexican politics? A.It ended the one-party system. B.It consolidated power among a few key leaders. C.It ended ...

*January 30, 2014 by annabelle*

**Math (not specific knowledge, just research)**

For math class, we are planning an indoor carnival. We need to figure out the size of each exhibit and vendor, and make sure all of them fit into the space. We can choose any large indoor space we can think of. I did some research online and chose the Pennsylvania Convention ...

*March 11, 2009 by Adriana*

**science: check my answers please**

h t t p: //tinypic . co m/r/309lnac/3 1. The population growth exhibited by population A to the right is what? Is is exponential? 2. Population B reaches its carry capacity at about what size? a. 0 b. 500 c. 1000 d. 1500 e. 2000 Is it 1500? 3. The plateau of population B is ...

*August 30, 2009 by maggie*

**science (please check my answers)**

h t t p: //tinypic . co m/r/309lnac/3 1. The population growth exhibited by population A to the right is what? Is is exponential? 2. Population B reaches its carry capacity at about what size? a. 0 b. 500 c. 1000 d. 1500 e. 2000 Is it 1500? 3. The plateau of population B is ...

*August 30, 2009 by maggie*

**SOCIOLOGY**

Check a school or public library or a nearby bookstore for a collection of jokes and humorous stories. How many stereotypes of minorities are in such books? What roles do humorous images of minority groups play in our perceptions and thinking? Why are stereotypes difficult to ...

*September 16, 2009 by Carol*

**History**

Was not sure whether you got the last post. I am repeating it. Is this a thesis statement. Please comment and can you advise me whether the grammar,spelling etc. Is good? In this essay I am going to show you the impact of the Industrial revolution. By the end of the essay you ...

*March 3, 2010 by Ruth*

**Teachers Aide/Language and other Barriers**

12. The best way for a school to demonstrate multicultural awareness is to A. host special “ethnic” or “diversity” student assemblies. B. include multicultural content in as many subject areas as possible—in mathematics, science, etc. C. celebrate ethnic or cultural ...

*September 25, 2010 by AspiringTeacherandMotherofFour*

**phys**

An electron of kinetic energy 50 keV moves in a circular orbit perpendicular to a magnetic field of 0.405 T. Find the radius of the orbit. I tried using KE=mv^2/2 to find velocity. then using qBv=(mv^2)/r to solve for r. but my answer was wrong. I am pretty sure this is the ...

*October 14, 2014 by sara*

**english**

I need to find the simple subject and simple predicate: Every sentence should begin with a capital letter. I know that "sentence" is the simple subject but I'm not sure if the simple predicate must include the word "should" or if it's just "begin" Help please

*September 16, 2009 by Elizabeth*

**geometry**

Describe the image of D first reflected across line l then across line m. You have the letter D then a line up and down L then a space and then a line up and down M. Not sure how to describe the image.

*March 13, 2012 by kevin*

**calculus**

Find the area between the graph of f and the x-axis over the interval [−4, 1] when f(x) = 4 + 4x. 1. Area = 34 sq. units 2. Area = 30 sq. units 3. Area = 28 sq. units 4. Area = 32 sq. units 5. Area = 26 sq. units

*February 26, 2012 by Hillcrest*

**algebra**

x/9 +3 = 8 - x/3 Solve?????? First, get rid of the fractions to make the equation easier to solve for x. Let's multiply every term by 9: 9 [x/9 + 3 = 8 - x/3] x + 27 = 72 - 3x 4x = 45 x = 45/4 Substitute 45/4 for x in the original equation to check. It always helps to check ...

*February 5, 2007 by deborah*

**Math**

You and Bruce Willis are upright in a natatorium of liquid with containers of 5.3 gallons and 3.75. You need exactly 4 1/2 gallons of liquid to create a certain solution. How can you assure that you have exactly that amount? Show your work.

*April 2, 2007 by Jeanne*

**ATTENTION WRITEACHER!**

Thanks so much for your help on my english question. I posted a reply with another question down below. You're REALLY smart so can you please check my work that i put donw below! thanks again, i really appreciate it:)

*February 26, 2008 by Miley*

**physcis**

you can close a door by pushing on the door anywhere except directly on the hinge. In each case you do exactly the same amount of work. Why does it seem harder to close thedoor if you push it cose to the hinge.?

*October 15, 2008 by Anonymous*

**Math**

I need the answers and the work shown steb by step today pls^^ For each direct variation find the constant of variation.Then find the value of y when x= -5 1.y=2 whne x=7 2.y=-2 when x=2 3.y= 17 when x=-4 y varies directly with x. 1.if y=6 when x=2,find x whn y=12 2.if y=7 ...

*October 6, 2009 by alex*

**Physics**

A total of 650 joules of work is done on a 50.-kilogram object as it is moved 8.0 meters across a level floor by the application of a horizontal force. Determine the magnitude of the horizontal force applied to the object

*January 7, 2010 by Priscilla*

**physics**

What is the minimum work needed to push a 850 kg car 940 m up along a 9.5 degree incline? Part A: Ignore Friction Part B: Assume the effective coefficient of friction retarding the car is 0.20.

*March 3, 2010 by Justin*

**chemistry**

A sample of an ideal gas at 15.0 atm and 10.0 L is allowed to expand against a constant externam pressure of 2.00 atm at a constant temperature. Calculate the work in KJ for the gas expansion (Boyle's law applies)

*October 9, 2010 by alexie*

**surveying math **

I need help with this problem and I need to show my work. Can anyone help me? A vertical angle of -40 is recorded between A and B. The slope distance, after meteorological corrections, is 806.388 m. What is the horizontal distance between A and B?

*October 15, 2010 by Kasey*

**physics**

10 moles of a gas initially at temperature 300 K is compressed adiabatically from a volume of 2 cm3 to a volume of 325 cm3. To the nearest tenth of a joule what is the work done by the piston? (It is a monatomic ideal gas.)

*October 26, 2010 by sandhu*

**physics**

A 2.38 × 103 kg car requires 5.4 kJ of work to move from rest to some final speed. During this time, the car moves 28.1 m. Neglecting friction, find a) the final speed. Answer in units of m/s.

*November 2, 2010 by Joe*

**government**

a political action committees purpose is to a. use propaganda b. work for the interests of all americans c. raise enough money for political candidates d. encourage americans to join interests groups

*November 29, 2010 by kelly*

**government**

a political action committees purpose is to a. use propaganda b. work for the interests of all americans c. raise enough money for political candidates d. encourage americans to join interests groups

*November 29, 2010 by kelly*

**physics**

a 60-kg patient exercise on the treadmill, exerting a constant force of 500N while running at a constant velocity of 4 m/s at an angle of 30 for 5 minutes. the coefficient of kinetic friction of the treadmill os 0.45. determine the work done by the patient.

*February 9, 2011 by clariss*

**Math**

Hi Trying to work with confusing Taylor series....any assistance would be much appreciated!! How can I use T(x)=5-9((x-2)^2)-3((x-2)^3) to approximate the f(0) ???? I realize that Taylor series f(x)=f(a)+f'(a)(x-a)+f''(a)((x-a)^2)etc... but the above T(x) is centered at x=2, ...

*March 15, 2011 by Kiksy*

**Psychology Life coaching**

Hello, can you steer me in the right direction of what my professor it looking for? We need to find a book and critique it on the subject of life coaching. Would any book by john c. maxwell work. thanks

*July 7, 2011 by desireee*

**Math**

Hello. I am trying to help out my sister and find patterns in numbers.... Ex/ 1+2 2+2 3+2 4+2 My question is... I can't figure out what the pattern is in the following set... 1 goes to 4 2 goes to 7 3 goes to 10 and 4 goes to 13...... I initially thought that it was 3x + 2 but...

*September 9, 2011 by David*

**math**

Graph the equation by completing the table and plotting the points. You may use Excel or another web-based graphing utility. a) y = 3x - x2 Use the values of x provided in the table to find the y values. Show your work.

*September 17, 2011 by shirley*

**physics**

A horizontal force of magnitude 33.5 N pushes a block of mass 3.80 kg a distance of 3.00 m across a floor, where the coefficient of kinetic friction is 0.600. (a) How much work is done by that applied force on the block-floor system?

*December 18, 2011 by t.a.*

**Math**

Alex works 4 hours on tuesday,thursday ,and Friday.He earns $6.50 per hour.He is saving to buy a television that costs $525.How many weeks will Alex have to work to buy the television?

*May 21, 2012 by Jayla*

**Math**

Alex works 4 hours on tuesday,thursday ,and Friday.He earns $6.50 per hour.He is saving to buy a television that costs $525.How many weeks will Alex have to work to buy the television?

*May 21, 2012 by Jayla*

**Geometry**

A regular hexagon is circumscribed about the ring surrounding the clock face. The diameter of the ring is 10in. Find the perimeter if the clock face. Please included work/steps to solve. Thanks!

*May 22, 2012 by Marisa*

**MATH**

A committee of 5 people is to be selected from student council. Council has 6 boys and 7 girls. What is the probability that the committee will have at least 3 boys? *** If you can show work that would be helpful (OPTIONAL)*** THANK YOU VERY MUCH!

*May 24, 2012 by Tom*

**MATH HELP**

A committee of 5 people is to be selected from student council. Council has 6 boys and 7 girls. What is the probability that the committee will have at least 3 boys? *** If you can show work that would be helpful (OPTIONAL)*** THANK YOU VERY MUCH!

*May 24, 2012 by Tom*

**Math Statistics**

Czarina is working part time at a pastry shop baking cupcakes. If she works for 30 hours in one week on the average, how many hours a day does she work if she works 5 days a week?

*October 19, 2012 by Amelia*

**physics**

7.0 kg block moves in a straight line on a horizontal frictionless surface under the influence of a force that varies with position as shown below. How much work is done by the force as the block moves from the origin to x = 8.0 m?

*November 2, 2012 by kunal *

**college algebra--please help**

Form a polynomial f(x) with real coefficients having the given degree and zeros. degrees 5; zeros 1; -i; 7+i please show all work. I am having a hard time understanding this.

*November 20, 2012 by Heather*

**math**

a rope was tied to trees at both ends the curve of the rope can be modelled by the equation y=x^2-12x where y is the height and x is the horizontal distance both in feet how far apart are the trees how do you know. show your work

*December 19, 2012 by t*

**math help please urgent**

the difference of two numbers is 27. the first number is equal to one more than twice the value of the second number. find both numbers. please show work.

*February 8, 2013 by ellis*

**Graphing Circles - Finding the radius **

A circle is tangent to the y-axis at the point (0,2) and passes through the point (8,0). Find the radius of the circle. I tried using distance formula but it doesnt work? Help please thanks.

*March 10, 2013 by Knights*

**statistics**

The standard score for hours spent online at home for minnesotan was 3.00 approximately how many hours do minnsotan adults spend online at home? Show your work and round all cuclulation to the tenth

*March 21, 2013 by wally*

**mult choice**

The Balance Sheet of a manufacturing firm will include which account that will NOT be included in the Balance Sheet of a service firm? A. Cash B. Accounts Payable C. Prepaid Insurance D. Work in Process Inventory

*August 15, 2013 by dakota*

**Advanced functions/precalculus**

1. Given f(x)=x^2 and g(x)=x+2, determine in standard form: a) g(f(x)) b) when f(g(x))=g(f(x)) 2. If f = {(-10, 1), (-1, -1), (10, 0), (11, 7)} and g = {(-1, -1), (0, 10), (1, -10), (7, 11)} for how many values of x is f x g defined? Explain 3. Given f(x) = -2x + 3 and g(x) = ...

*January 15, 2014 by Diane*

**Physics**

A 295kg box is pulled at a constant speed by the little engine. The box moves a distance of 2.8 m across the horizontal surface. (μ=.20) How much energy is transferred by the engine? (How much WORK is done?)

*March 14, 2014 by Anonymous *

**math**

You have several 5x11 rectangles, using only these rectangles, what can you make? A) 39x54 rectangle? B) a 39x55 rectangle? Plz help my parents are at work and sisters are doing homework, I'm 9 help!!! ( math due tomorrow!! )

*September 11, 2014 by RIZ*

**chemistry **

Two moles of an ideal gas initially at 27C and 1 atm pressure are compressed isothermally and reversibly till the final pressure of the gas is 10 atm. Calculate the work done. (R=8.314 JK-1mol-1)

*February 21, 2015 by anu *

**Algebra 2**

Please show your work to find the mean and standard deviation of the data. Round to the nearest tenth. 20, 16, 18, 14, 9, 20, 16 I know i have to add all them and divide the answer by 7. And that's my mean , But Idk how to get the standard deviation ?

*March 31, 2015 by Ciaria *

**physics **

Money managers: A. help people set up budgets to control personal spending. B. typically work for investment banks. C. are on the “sell side” of Wall Street. D. are on the “buy side” of Wall Street. B?

*April 3, 2015 by Ciaria *

**AP Chemistry**

How much work is done by the system when 2.00 moles of O2 expand from a volume of 3.00 liters to a volume of 5.1 liters against a constant external pressure of 0.0100 atm? Answer in units of J. I get w=-p(deltaV) but what about moles?

*April 16, 2015 by Alex*

**math**

you have apple, mapple, oak, poplar, and spruce trees. about how many different groups can u make with three different trees? please help this is alot of work and i have until 4;45 to get it all done!

*May 5, 2015 by please help*

**Physics **

A 7 kg block is pulled 8 m along a frictionless horizontal plane by a 23 N force that acts at 39 degrees above the horizontal. What is the work done by the force on the block? I don't get how to start the problem, I feel like there is something missing.

*November 1, 2015 by vstudent*

**Math 7th grade**

A recipe serves 12 people and requires 1/5 cup of eggs. If you wanted to make the same recipe to serve 4 people, how many cups of eggs would you need? Show your work.

*February 29, 2016 by Kristie*

**Math**

James wants to reserve a room at the party hall for his birthday. The deposit is $175 and for 6 hours it cost $625. What percent of the cost of the room is the deposit? Can someone show me how to work this problem out?

*April 12, 2016 by Lisa*

**Physics**

PHYSICS HELP PLS!!How does the equation of a displacement v. speed graph (cart moving down an incline through a speed gate) relate to the work-energy principle. Pls answer asap! Thanks!

*April 16, 2016 by PLS HELP!!*

**math**

the productivity of a person is modelled by the function y=5cos(pi/2 t)+5, where t is in hours and t>and equal to 0. if the person starts work at 8:00am and works for 12 hours determine at what times they are least productive.assume that t=0 represents 8:00am.

*July 21, 2016 by Stacy*

**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 by Taylor*

**precaculus**

Convert the rectangular coordinate (2,-2) to polar form and find two additional representations of this point. Can you check my work and explain how to finish the question? r=√(2)2+(-2)2 r=2√2 tan theta = (-2)/2 theta = -1 polar coordinate= (2√2, -1)

*December 12, 2016 by Anonymous*

**AP Calculus..again**

A balloon is composed of a right circular cone joined at its base to a hemisphere. The diameter of the base is equal to the height of the cone. If the balloon is inflated, at what rate is the volume, V, changing with respect to the height, h. Volume=1/3 area base * height = 1/...

*October 26, 2006 by Sarah*

**math calculus**

(24x^3-54x^2-15x)/(6x^2-15x) i don't factor number from whole equation way i do it is find number that add to give me -54 and multiply to give -360. the number i get -60 and +6. so i do this: 24x^3-60x+6x-15x i factor this further and get 12x(2x^2-5)3x(2-5)/(3x)(2x-5) nothing ...

*January 4, 2012 by Shreya*

**Pre-calculus**

Initially 600 milligrams of a radioactive substance was present. After 7 hours the mass had decreased by 3%. Construct an exponential model A(t) = A0ekt for the amount remaining of the decaying substance after t hours. Find the amount remaining after 24 hours.

*November 23, 2015 by Kim*

**Math**

What is the real value of x in the equation log(subscript 2)24-log(subscript 2)3=log(subscript 5)x? I really cannot remember at all how logs work. I know the answer is 125 but have no idea how to get there. Thanks in advance.

*November 17, 2007 by Natalie*

**Math**

Given that force 1=60 pounds and force 2=90 pounds, find the angle between the forces if the magnitude of the resultant force is 50 pounds. Round answer to the nearest degree and show work.

*April 27, 2011 by Shelby*

**Physics**

A truck carrying a 65.4 kg crate accelerates from rest to 53.9 km/h on a flat horizontal surface in 15.2 seconds. The crate does not slip in the truck bed. The acceleration was not constant. How much work was done on the crate by the truck?

*October 9, 2012 by Anonymous*

**chemistry**

for the reaction 3C2H2=> C6H6 at 25 C, the standard enthalpy change is -631 KJ and the standard entropy change is -430 J/K. calculate the standard free energy change at 25 C. show all work!

*December 4, 2012 by ashley *

**Physics**

A +30 µC point charge is placed 32 cm from an identical +30 µC charge. How much work would be required to move a +0.45 µC test charge from a point midway between them to a point 11 cm closer to either of the charges?

*October 16, 2013 by Rex*

**Math**

(2+3i)^6 Using Demoirves Theorem. I tried solving it out, but somehow it didn't work for me. (2+3i)^6 r=|z|=square root of 2^2 + 3^2 = square root of 13 z = square root of 13 * (cos____ + isin_______ ) At this point I am stuck, so can someone help me?

*January 13, 2016 by David *

**calculus**

The function f has derivatives of all orders for all real numbers x. Assume f(2)=-3, f'(2)=5, f''(2)=3, and f'''(2)=-8. The fourth derivative of f satisfies the inequality, the (absolute value of f''''(x)) <=3 for all x in the closed interval [1.5, 2]. Use the Lagrange ...

*March 16, 2007 by Meredith*

**algebra**

Can somebody please help me with these problems? Factor the expression on the left side of each equation. Then solve. 1)x^4-5x^2+4=0 2)x^4-8x^2+16=0 Please and thank you! 1) let y = x^2, then y^2-5y+4=0 (y-4)(y-1)=0 y = 4 or y = 1 x^2 = 4 or x^2 = 1 x = -2, +2, -1, +1 same ...

*January 4, 2007 by Valerie*

**AP Physics**

While exploring a cave, a spelunker starts at the entrance and moves the following distances: 75.0 m north, 250 m east, 210 m at an angle 30.0° north of east, and 150 m south. Find the resultant displacement from the cave entrance. I know I have to use the formulas Ax = A cos...

*August 26, 2009 by Annamaria*

**Chemistry --really need help!**

I am really struggling with these problems!! A reaction mixture that consisted of 0.20 mol N2 and 0.20 mol H2 was introduced into a 25.0 L reactor and heated. At equilibrium, 5.0% of the nitrogen gas has reacted. What is the value of the equilibrium constant Kc for the ...

*February 19, 2010 by Angelica*

**Pre-Calc**

medication duration using the function of e through time lapse problem D(h)=8e(up carrot)-0.31(h) find med level at 1 hour- no problem 5.88mg. but every time I insert 4 for the 4 hours I get a larger number... much larger indicting the med level has gone up. I am sure it is my...

*February 21, 2010 by BecKi*

**statistic **

age days in hospital 40 11 36 9 30 10 27 5 24 12 a. draw a scatter diagram (completed) b. does there appear to be a correlation between age and number days in the hospital? no Find the r value for this problem to verify your answer? R=.16 c what is the regression equation for ...

*July 13, 2012 by bria*