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December 4, 2016

Search: Calculus - not sure if my work is correct?

Number of results: 69,870

math
Labrina received a $50 gift card to an online store. she wants to purchase some bracelets that costs $8 each. There will be a $10 overnight shipping fee. how many bracelets can she buy? A 4 bracelets B 5 bracelets******* C 6 bracelets D 7 bracelets is the second one correct ...
October 21, 2014 by kathy

Urgent math
A man gets a job with a salary of $40,000 a year. He is promised a $1900 raise each subsequent year. Find his total earnings for a 10-year period. I got 59,000 and it is wrong what it the correct answer?
August 10, 2015 by jayleen

Statistic
test consists of 10 multiple choice questions with five choices for each question. As an experiment, you GUESS on each and every answer without even reading the questions. What is the probability of getting exactly 7 questions correct on this test?
November 28, 2015 by Jenn

quantitative techniques
The following model is a simplified version of the multiple regression model used by Biddle and Hamermesh (1990) to study the tradeoff between time spent sleeping and working and to look at other factors affecting sleep: sleep=B_0+B_1 totwork+B_2 educ+B_3 age+u Where sleep and...
October 9, 2015 by ahsan

quantitative techniques
The following model is a simplified version of the multiple regression model used by Biddle and Hamermesh (1990) to study the tradeoff between time spent sleeping and working and to look at other factors affecting sleep: sleep=B_0+B_1 totwork+B_2 educ+B_3 age+u Where sleep and...
October 16, 2015 by azam

qualitative techniques
The following model is a simplified version of the multiple regression model used by Biddle and Hamermesh (1990) to study the tradeoff between time spent sleeping and working and to look at other factors affecting sleep: sleep=B_0+B_1 totwork+B_2 educ+B_3 age+u Where sleep and...
October 22, 2015 by usman

Calculus
A 12' ladder is leaning against a wall making an angle theta with the ground. The ladder begins to slide down the wall. what is the rate of change of the height of the ladder, h, with respect to the change in the angle of the ladder with the floor when the ladder reaches a ...
November 16, 2012 by Anonymous

Calculus
A 12-ft ladder is leaning against a vertical wall when Jack begins pulling the foot of the ladder away from the wall at the rate of 0.5ft/s. What is the configuration of the ladder at the instant that the vertical speed of the top of the ladder equals the horizontal speed of ...
October 26, 2014 by Zoe

Calculus
An aluminum beam was brought from the outside cold into a machine shop where the temperature was held at 65 degrees F. After 10 minutes, the beam warmed to 35 degrees F anf after another 10 minutes its temprature was 50 degrees F. Use Newton's Law of Cooling to estimate the ...
May 13, 2008 by Anonymous

CALCULUS
Please help.. ʃ (4sin²x cos²×/sin 2x cos 2x)dx That's integration of (4sin^2x cos^2x over sin 2x cos 2x) dx i've got it from the back and it has an answer from the back page of the book but i want to know how to solve it..i really need it for practicing this subject......
January 10, 2012 by INTEGRAL

Calculus
A piece of wire 40 m long is cut into two pieces. One piece is bent into a square and the other is bent into an equilateral triangle. How should the wire be cut so that the total area enclosed is a maximum= minimum= Find the length of the wire used
May 7, 2013 by Brian

physics
A rope is usd to pull a box 15mt across the floor.the rpe is @an angle of 46dgree to the horizntal. A force of628N is dne by the rope to the box.hw much work does the rope do on the box
August 15, 2011 by Luc

math
Juan makes $6.50 an hour plus an extra $15.25 per week. Last week he earned $47.75. Look at this equation that represents Juan's earnings ;ast week. 6.50h+15.25=$47.75 How many hours did Juan work?
December 30, 2011 by alexis

MATH
Juan makes $6.50 an hour plus an extra $15.25 per week. Last week he earned $47.75. Look at this equation that represents Juan's earnings ;ast week. 6.50h+15.25=$47.75 How many hours did Juan work?
December 30, 2011 by alexis

chemistry 2
for the reaction 2C2H2(g)=>C6H6(l) 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 Help please!
December 5, 2012 by concerned chem student

chemistry 2
for the reaction 2C2H2(g)=>C6H6(l) 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 Help please!
December 5, 2012 by concerned chem student

Physic
The tension on a wire is 2640 N. The wire is 2.6 m long and the fundamental frequency is 330 Hz. What is the mass of the wire? (Answer: 2.33g) Answer is provided above. Please show all work on how to get the answer. Thank you!
May 30, 2014 by Anonymous

Chemistry
I just completed a lab called "Acid-Catalyzed Dehydration of an Alcohol: Synthesis of 2-Octenes." I started with 2-octanol and the lab instructions said the product had the possibility of being 1-octene, trans-2-octene, and/or cis-2-octene. I did end up with trans-2-octene (...
July 14, 2011 by Carole

management
Imagine that you are Bill Gates, the founder of Microsoft, and that you are constantly engaged in environmental scanning as part of the planning process. Explain briefly how you would go about doing it. Can you keep track of all aspects of the environment? If not what aspects ...
November 19, 2009 by amy

Literature HELP!!!
Which phrase best describes Samuel Pepys's personality, judging from the Diary excerpts you read? A.a caring, social man with many friends B. a hardworking but miserly man who cares only about the damage the fire will cause his properties C.an angry and depressed man who has a...
July 14, 2010 by Cody

trig-reply to Reiny
RE: (- sin (x/2) /( 2 sin (x/2) + cos (x/2)) is an alternate representation for, 1 / ( 4 tan (x/2) + 2 ) Thanks for your help, sorry I posted 3 times, I thought you didn't understand what I needed. I really do appreciate your time spent. just for your FYI, if you are ...
January 3, 2011 by Carol

French
Bonjour! So for my homework assignment I'm writing a letter to the clouds because I'm angry about waking up to snow this morning. We just have to use vocab words. Anyway, I'm stuck on how to say this: Please keep your precipitation to yourself My best attempt is: S'il vous ...
April 21, 2011 by Samantha

Grammar
Which of the following sentences displays an INCORRECT use of interjections? A.No, I have not told Laura about the surprise! B.Great! I will make a reservation for the restaurant right away. C.Well, now that I think about it, maybe we should choose another date for the dinner...
September 19, 2012 by Beth

Physics
When I look into my beautiful 1981 Vanagon's rear view mirror, I see a semi-truck coming toward me way too fast. The truck has lost its brakes and is traveling at 140 km/hour down the steep mountain road we're on. At the last second, the truck exits onto an escape ramp that ...
October 9, 2012 by Dianne

countiblis,math
How did you get: x = 2; y = -1 for Directions: Sove the system by addition 5x-3y=13 4x-3y=11 for this type of problem there is no shading correct. or am i wrong 5x-3y=13 4x-3y=11 If you subtract the two equations you get: 5x-3y - (4x-3y) = 13 - 11 The y's on the left hand side...
February 10, 2007 by jasmine20

Art... complements
Hello, My answer for the following question is #4, is that correct? Thank You When your brain automatically seeks the complements of highly saturated colors, this visual phenomenon is called #1 Simultaneous contrast #2 contrasting complementary color #3 complementary spilt #4 ...
August 23, 2007 by Mandi

Mathematics
Solve the following differential equation, i.e. solve for y: dy/dx - y/x = 1/x + y + 1 I have this so far, 1. dy/dx= (y + 1 + xy + x)/x 2. x dy = (y + 1 + xy + x)dx 3. Integrate both sides... xy + c = xy + x + .5x^2y + .5x^2 + k where c and k are constants 4. c = x + .5x^2 (y...
December 29, 2007 by xX_Supaman_Xx

Physical Science
Hello, Can some one tell me if I came to the correct answer... Thank You How much heat energy is required to raise the temperature of 5 kilograms of coal from 20 degrees celsius to 220 degrees celcius? my answer: 1,314,718 J
February 8, 2008 by Mandi

Physical Science
Hello, Can some one please tell me if I have the correct answer? Thank You my answer: D In a cathode ray tube, the number of electrons that reach the fluorescent screen is controlled by the? A.anode B.cathode C.deflecting plate D.grid
March 23, 2008 by Mandi

ENGLISH
WHICH OF THE FOLLOWING SENTENCE IS grammatically CORRECT? A. I really need to lay down. B.Sit it down over there by the window. C. I thought it would be best if I were to raise a curtain. D. The men came today to lay the carpet in the living room.
August 6, 2008 by Anonymous

english
Which of the following sentence is grammaticaly correct? A.Ireally need to lay down. B.Sit it down over there by the window. A.I thought it would be best if I were to rise the curtain. D.The men came today to lay the carpet in the living room.
August 7, 2008 by Anonymous

Math
720-2=1/6 Try to find the correct answer. Example is 11+30=1 reading 11 months plus 30 days equals 1 year. If I have fiqured this correctly it is 720 seconds minus 2 minutes = 1/6 of one hour. Can any one agree or disagree?
August 21, 2008 by Austin

3rd grade
write addition vertically.decide which new groups you will make.then add to see if you are correct. 256+1273_________ a new ten?________ a new hundred?___________ a new thousand?_________ i need answer and explain how
October 12, 2009 by mark

English
1.He delayed doing/to do his homework. 2.He suggested going/to go on a picnic. 3.He quit smoking/to smoke. 4.He avoided meeting/to meet the lady. 5.He proposed going abroad/to go abroad. (Which one is correct? Do we have to use only gerunds in the sentences above?)
March 19, 2010 by rfvv

English
Which of the following choices is a strategy that can help speed up reading? A. external distractions B. Using a penor pencial as a pacer C. Use subvocalization I think both B and C are correct. But I could only choose one answer. What do you guys think the answer should be? ...
July 8, 2010 by Zack

physical education
are the anatomical names for the following right?: skull-cranium shoulder blade-clavicle spine-sternum collar bone-scapula thigh bone-femur fingers-phalanges can you please check if the names are correct
October 16, 2010 by chelsea

English
Punctuation Correction please! As we have discussed, the Spanish Club wants to sponsor a summer study trip to Spain. If our initial surveys are correct, the number of students wishing to participate in the summer study group will exceed 15.
February 27, 2011 by April

com 155
I need you to check the 3 sentences for the correct use of a plural: 1. Personal financial information should be kept in files. 2. Store financial papers in a filing cabinet. 3. Bank statements should be stored in a safe place.
May 20, 2011 by blake

composition and communication1
Can somebody please help me write 150 words on feedback from writpoint I"ve got this so far I think the feedback from writpoint was very helpful to me because it explains to me what i did wrong and how to fix my mistakes. It also tells where to put correct punctuation.
June 27, 2011 by carrie

math
mistyped before. A sphere has a volume of 500/3 pi cubic centimeters. What is the total surface area in square centimeters, of the sphere? The correct answer is 100pi, but I have no idea why. I need to see it worked out from start to finish :(
October 14, 2011 by robby

english
is " but I will not allow anyone to succeed hanging clouds over me" a metaphor or paradox or is it something else? is "there's a light in me, that shines brightly" a metaphor? " Iwill rise steadily sailing out of their reach" a paradox? if im not right can someone tell me the ...
October 28, 2011 by jane

Human Services
Please let me know if I am correct. An example of criterion validity is when a human service professional uses a scale to measure risk of suicide. If the scale is valid it should correlate with the occurence of negative behaviors which harm one self
January 28, 2012 by Patiance

human services
Please let me know if I am correct. An example of criterion validity is when a human service professional uses a scale to measure risk of suicide. If the scale is valid it should correlate with the occurence of negative behaviors which harm one self
January 29, 2012 by Anonymous

Pre-Cal
If the interest on a long-term Canadian(3/8%) investment is compounded continuously, how long will it take the value of an investment to triple? (Give the answer correct to two decimal places.) Got 19 years--its wrong, can't find reason. Thanks.
February 29, 2012 by Nick

civlilization
All of the following are correct about nineteenth century Liberalism EXCEPT: A. having economic and political components. B. supporting the idea of civil rights. C. wanting to limit governmental power. D. opposing limiting governmental power.
July 12, 2012 by marie

English
could someone explain this quote please? I have the idea but my words fail to express it in a correct explanation. The words I use don't fit the explanation very well. (: "...he whose inward and outward senses are still truly adjusted to each other..."
September 13, 2012 by claire

business math
Hello,I'm just confuse with this problem: Find the due dates of each of the following notes. 1.) Date of loan: October 16, 2001; Time: 120 days. My answer is February 14, 2002.. Im just wondering if my answer is correct.? Thanks.
September 26, 2012 by suzy

math
Consider the supply equation where x is the quantity supplied in units of a thousand and p is the unit price in dollars. p=x^3+x+10 Determine the price at which the supplier will make 2,500 units of the commodity available in the market. (Give your answer correct to the ...
February 9, 2013 by joy

math
Consider the supply equation where x is the quantity supplied in units of a thousand and p is the unit price in dollars. p=x^3+x+10 Determine the price at which the supplier will make 2,500 units of the commodity available in the market. (Give your answer correct to the ...
February 13, 2013 by kasie

math
Consider the supply equation where x is the quantity supplied in units of a thousand and p is the unit price in dollars. p=x^3+x+10 Determine the price at which the supplier will make 2,500 units of the commodity available in the market. (Give your answer correct to the ...
February 25, 2013 by Ashton

physics
An 11-mm wide diffraction grating has rulings of 550 lines per mm. Light is incident normally on the grating. The longest wavelength that forms an intensity maximum in the fifth order is closest to? The correct answer is 488nm but I cant seem to get that answer.
April 17, 2013 by james

physics
An 11-mm wide diffraction grating has rulings of 550 lines per mm. Light is incident normally on the grating. The longest wavelength that forms an intensity maximum in the fifth order is closest to? The correct answer is 488nm but I cant seem to get that answer.
April 17, 2013 by james

physics
When 1.60 multiplied by 105 J of heat enters a cherry pie initially at 20.0°C, its entropy increases by 470 J/K. What is its final temperature (C)? Drwls answered: delta S = entropy change = 1.6*10^5*[1/293 - 1/T2] = 470 Solve for T2 But after I checked the answer, it is not ...
July 26, 2013 by Justin

Ethics
According to Kant, we have no direct duties to animals because they lack personal attributes such as___________. my answer is all above could some one tell me if im correct. a. Rationality. b. Self-consciousness. c. Free will. d. All of the above.
February 27, 2014 by Anonymous

math
A jar contains 20 marbles: 4 red, 6 white and 10 blue. If you remove 1 marble at a time, randomly, what is the minimum number that you must remove to be certain that you have at least 2 marble of each color? I guessed the answer was 18 and it was correct but I don't know how ...
August 6, 2014 by john

Linear Algebra
Show that the set [(3,-2,4),(1,2,-1), (-6,4,-8) is linearly dependent by writing a non-trivial liner combination of the vectors that equals the zero vector. After some calculations I got t1=2, t2=0 and t3=1, but its my understanding that if a set is dependent, none of the t's ...
September 23, 2014 by Jervis

History
All of the following are correct about nineteenth century Liberalism EXCEPT: A. having economic and political components. B. supporting the idea of civil rights. C. wanting to limit governmental power. D. opposing limiting governmental power. d
September 29, 2014 by Angela

Math
You want to make an investment in a continuously compounding account over a period of 100 years. What interest rate is required for your investment to double in that time period? Round the logarithm value and the answer to the nearest hundredth. I got C, is this correct? 0.7...
December 17, 2014 by Anonymous

chem
A sample of hydrogen with a volume of 800 mL exerts a pressure of 620 mm Hg at 5°C. Approximately what volume will it occupy at standard temperature and pressure? V2=800x620x273/760x278 =135,408,000/211,280 V2=640.9 mL Can someone tell me if I'm correct or not?
May 19, 2015 by t

English
What rhetorical devices were used in Lester Pearsons address on the inauguration of the national flag? I have found an alloiteration in paragraph 4 "our new flag will fly for the first time" an antithesis in para 5 and an anaphora in para 13? Are these correct?
July 16, 2015 by Sam

Math
In a high school reunion, the organizers decided to sell 1500 raffle tickets at 1000 each for the four prizes of 250,000 125,000 75,000 50,000 What is the expected value of one ticket? I got -670, is this correct? Thanks!
October 28, 2015 by Jen

Human Growth
Dizygotic twins are: A identical in genetic make-up, but not identical in appearance. B. the result of the division of just one fertilized egg C. no more alike that any other siblings D. almost mirror images of one another I choose A is that correct
October 29, 2015 by Tonya

english
1.Choose the term that best describe the underlined phrase. (This is a battle) about which little is known. A.noun clause B.adverb clause C.adjective clause D.independent clause I think the answer is A because my two opinions is between A and D. please correct me if im wrong
December 13, 2015 by GummyBears

Math help ASAP please
A kicker kicks a football during practice. The equation below can be used to find the height (h) in feet after t seconds. h(t)=-16t^2+96t After how many seconds will the ball hit the ground? A. 6 B. 7 C. 96 D. 0 My answer is B, is this correct?
May 10, 2016 by xxAnonymousxx

L.A.
Why should you avoid writing about too many events in a personal narrative? A.to avoid overwhelming the reader with too much info. B.to help you, the writer, stay on topic. C.to allow your self, the writer, room to add many details and descriptions. D. all of the above are ...
October 3, 2016 by CJ

Physics I
I'm not sure how to address any of these. I"ve attempted them but each time I do, I've gotten different answers. I'm not even sure where to begin. 1. The Duke’s efforts to conquer the Count are starting to really falter. He has been forced back away from the walls quite a ...
December 16, 2014 by Eva

Physics(Please help)
An object is inside a room that has a constant temperature of 295 K. Via radiation, the object emits three times as much power as it absorbs from the room. What is the temperature (in kelvins) of the object? Assume that the temperature of the object remains constant. I thought...
June 20, 2012 by Hannah

Math
An SUV can accelerate from 0 to 60 mph in 10 59/100 seconds. A sports car takes 9 86/100 seconds to get from 0 to 60 mph. How much faster does the sports car get to 60 mph? I'm not sure about this one but I think 127/100. Is there suppose to be a whole number? Because I make ...
October 30, 2012 by Jerald

Statistics
The mean and median sales prices of new homes sold in the U.S. in November 2010 were $213,000 and $268,000. Which of these numbers is the mean and which is the median? Explain how you know. I'm assuming the median is $213,000 and the mean is $268,000. However, I'm just ...
May 22, 2013 by Anonymous

Math-Algebra
Bracy would like to form a right triangle our of her wooden sticks. She cut the first stick of the length 6 inches and the second stick of the length 4 inches. What should be the length of the third stick to make sure she will be able to form a right triangle?
October 22, 2013 by McKenna Louise

Math
You have a jar with 60 jelly beans. You know that 1/3 of the jelly beans are yellow, 1/4 of them are white and the rest is red. You are not allowed to look. How many beans do you have to take out to be absolutely sure to get at least one yellow one? Can someone tell me the ...
October 25, 2016 by Nancy

Calculus
The temperature of a cup of Starbucks coffee at time t (in minutes) is T(t)= 70 + c e^(-kt) . Initially, the temperature of the coffee was 200 degrees F. Three minutes later, it was 180 degrees. When will the temperature of the coffee be 150 degrees F? The back of the book ...
November 10, 2009 by Bill

calculus please help!
Which of the following functions f has a removable discontinuity at a? If the discontinuity is removable, find a function g that agrees with f for x a and is continuous at a. (If the discontinuity is not removable, enter NONE.) 1. f(x)= (x^4-1)/(x-1), a=1 ?The discontinuity is...
September 3, 2010 by Terry

Pre-Calculus
The Hotel Bellville has 400 rooms. Currently the hotel is filled . The daily rental is $ 250 per room. For every $ 14 increase in rent the demand for rooms decreases by 5 rooms. Let x = the number of $ 14 increases that can be made. What should x be so as to maximize the ...
October 6, 2013 by Ann

algebra
Pick a country of your choice that is experiencing population growth. Using the Library, web resources, and/or other materials to find the most recent population count of the country you have chosen and the population growth rate of that country. Use that growth rate to ...
November 30, 2009 by stephanie

Calculus II
Here's the problem: Find the area of a plane region bounded by y=x^3 and its tangent line through (1,1). So far I have the graph on my graphing calc, so I have an idea at what I'm looking at. I found the tangent line to y=x^3 to be y=3x-2. Now I am stuck. I am trying to find ...
May 29, 2007 by Ace

physics, error calculation repost
I need to derive an error equation for Bohr's model to use in my physics lab this week. I am really bad at calculus, so if anyone can help me that would be really great. the equation is (1/lambda)=R[(1/n^2final)-(1/n^2initial)] I've never had to derive anything like this ...
March 8, 2011 by Trace

Calculus
You are given a piece of sheet metal that is twice as long as it is wide an has an area of 800m^2. Find the dimensions of the rectangular box that would contain a max volume if it were constructed from this piece of metal by cutting out squares of equal area at all four ...
March 26, 2014 by Marie

Algebra 2
1.) According to the American College Test (ACT), results from the 2004 ACT testing found that students had a mean reading score of 21.3 and a standard deviation of 6.0. The scores are normally distributed. A student scores a 35. What percent of the data would contain that ...
April 4, 2014 by Lanie

Spanish Check??
Check my spanish work on page 2 please? Anyone?
January 4, 2013 by Victoria

Calculus AB
A particle is moving along the x-axis so that at time t its acceleration is a(t)=ðcos(ðt) At time t=1/2, the velocity v of the particle is 1/2. Find the velocity of the particle at any time t. I think I got that right, as sinðt + C. Now it wants the minimum velocity of the ...
January 20, 2012 by Savannah

calculus
The count in a bacteria culture was 600 after 10 minutes and 1100 after 30 minutes. What was the initial size of the culture?Find the doubling period. Find the population after 80 minutes. When will the population reach 13000?
February 1, 2013 by Nycw

calculus
use differentials to determine by approximately how many square centimeters does the area of a square table increase if its diagonal is increased from 4 centimeters to 4.092 centimeters the question is The area of table increases by approximately (??) square centimetres
October 11, 2014 by denial

calculus trigonometric substitution
∫ dx/ (x^2+9)^2 dx set x = 3tan u dx = 3 sec^2 u du I = 3 sec^2 u du / ( 9 tan^2 u + 9)^2 = 3 sec^2 u du / ( 81 ( tan^2 u + 1)^2 = sec^2 u du / ( 27 ( sec^2 u )^2 = du / ( 27 sec^2 u = 2 cos^2 u du / 54 = ( 1 + cos 2u) du / 54 = ( u + sin 2u / 2) / 54 = ( arctan x/3 + ...
March 16, 2015 by Blake

Calculus
Hello I need help with this excersise of derivative of a inverse function. The excersise says: If f(x+2)=x^3+1 and g(x)=f(arctg x), find the derivative of the inverse function of g(x) and then calculate (g^-1 (9))'[the derivative of the inverse function evaluated in 9] . I don...
September 14, 2016 by Mary

Calculus
The position vector for a proton is initially r(with vector sign above it) =5.0i(with top)- 6.0j(with top) + 2.0k(with top) and then later is r vector = -2.0i(with top)+6.0j(with top)+ 2.0k (with top), all in meters. What is the proton's displacement vector, and to what plane ...
September 26, 2013 by Robin

calculus
Bacterial Population: A bacterial colony is estimated to have a population of P(t)=(24t+10)/(t^2+1) Million t hours after the introduction or a toxin. At what rate is the population changing in 1 hour after the toxin is introduced (t=1)? Is the population increasing or ...
August 4, 2009 by ariana`

math
Still having problems solving this... 2x(2x + 1)^2 = 312 I started with: 2x(2x+1)(2x+1)-312 = 0 2x(4x^2+4x+1)-312 = 0 8x^3+8x^2+2x -312 = 0 Now what? If you don't have to solve for x, then then you have the final answer! If you have to find x: then you have to use the group ...
January 23, 2007 by Steve

Integrals- Log/Ln
Can you check this please i'm not sure why it's wrong .__. 1) indefinite integral of 1/t *ln(t) dt the t*ln(t) is altogether on the bottom i got ln(ln(x)) + C 2) find the indefinite integral of 1/(sqrt(t)*[1-2*sqrt(t)]dt sqrt(x) is on the bottom. i got -ln(1-2*sqrt(t))+C can ...
May 24, 2013 by Erika

drying agent in chem
Is it advisable or not to leave a solution in drying agent for a few days? ~I did this ..since my chem lab instructor said to but I'm not sure I believe him. He sounded unsure of himself when he answered me. solution: methylene chloride (extracting oil of caraway) drying agent...
October 27, 2007 by ~christina~

Chemistry
If 33.8 mL of lead(II) nitrate solution reacts with excess sodium iodide to yield 0.865g of precipitate, what is the molarity of the lead(II) ions in the original solution? im not exactly sure how to start this problem. But i went ahead and gave it a shot .865 PbI2 x 1 mol ...
September 19, 2016 by Anonymous

calculus
In spherical coordinates, the inequalities 0≤ρ≤2, 3π/4 ≤ φ ≤ π 0 ≤ θ ≤ 2π, describe what kind of shape? So, the radius is from 0 to 2, and it makes a full circle around the z-axis. But what does 3π/4 ≤...
May 30, 2008 by Howie

Pre-Calculus
I don't understand,please be clear! Prove that each equation is an identity. I tried to do the problems, but I am stuck. 1. cos^4 t-sin^4 t=1-2sin^2 t 2. 1/cos s= csc^2 s - csc s cot s 3. (cos x/ sec x -1)- (cos x/ tan^2x)=cot^2 x 4. sin^3 z cos^2 z= sin^3 z - sin^5 z
October 31, 2013 by Anonymous

English
I urgently need you to help me rephrase the following lines (you once told me they were wrong.number 2). Macbeth: "Methought I heard a voice cry, “Sleep no more! Macbeth does murder sleep”—the innocent sleep,Sleep that knits up the raveled sleave of care,The death of ...
October 23, 2011 by Henry2

Calculus (Area Between Curves)
Find the area of the region bounded by the curves y=x^(-1/2), y=x^(-2), y=1 and y=3. You get: a.) 1/2(sqrt(3)) + 4/3 b.) 2(sqrt(3)) - 8/3 c.) 1/2(sqrt(3) - 32/3 d.) 2(sqrt(3)) - 32/3 e.) 8/3 - 2(sqrt(3))
February 29, 2012 by Mishaka

algebra
Given g(x) = –2x – 1, find g(3a). G(3a)=-2(3a)-1 = -6a-1 = -5 is this right or do I just stop at -6a-1 Just stop at -6a-1 Matt Also, let me add this. If you have -6-1 (without the "a") that would be -7. Not -5. But -6a-1 is the correct answer for this problem. Matt thank ...
May 25, 2007 by confused

English Grammar
1. The size and the length are decided by school rules. 2. The part on which the stick is used is decided by school rules as well. 3. How do you discipline problemed students? -------------------------------------- Are the expressions grammatical? If not, would you correct them?
October 8, 2007 by John

maths - ratio
the scale on a map is 1:2500, a pond is represented on the map as a shape whose perimeter is 12cms. Find the actual perimeter of the pond in kilometres. I came up with the answer 0.3. Is this correct?
September 16, 2008 by savannah xx

physics, fluids
would I be correct if I explained the 3 expressions in Bernoulli's equation as representing: P is the pressure 1/2*rho*v squared is the kinetic energy rho*g*h is the gravitational kinetic energy. Or is it more complicate than that. Thanks
January 24, 2009 by charlie

Math
Julia wants to build another garden wall, 10 bricks long and 3 bricks high. Can she build it with red and white bricks, so that no two bricks of the same color are next to each other? r w r w r w r w r w w r w r w r w r w r r w r w r w r w r w I say yes. Could you help me if ...
January 29, 2009 by Smiley

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