Friday

March 6, 2015

March 6, 2015

Total # Posts: 527

**Abstract Algebra**

Let A= -{-1}, that is, the set of all real numbers except -1. Define an operation on A by a*b=a+b+ab (usual addition and multiplication in R) a) Show that * is closed on A b) show that * is associative c) Find the identity element for * and verify that it is the identity d) ...
*February 22, 2011*

**COLLEGE ALGEBRA**

Suppose that R is the set of real numbers. Let f: R--> R be defined by f(x)= mx+b, where m and b are real numbers and m is nonzero. Prove that f is a bijection.
*February 22, 2011*

**Math**

Jonathan can type a 20 page document in 40 minutes, Susan can type it in 30 minutes, and Jack can type it in 24 minutes. Working together, how much time will it take them to type the same document?
*February 15, 2011*

**US History**

How did Hitler respond to Germany’s obligations under the Treaty of Versailles when he became Germany’s leader?
*February 10, 2011*

**Abstract Algebra**

Let f:A->B where A and B are nonempty. Prove that f(S1 U S2) = f(S1) U f(S2)
*February 5, 2011*

**Algebra**

The slope formula is Y2-Y1/X2-X1. So it would be 1-2/2+2 which equals -1/4
*February 5, 2011*

**childcare**

OMG u guys aren't helping I'm gonna save all my answers and post them when I'm done
*February 1, 2011*

**science**

what do you want to know?
*January 31, 2011*

**geometry**

If the perimeter of a particular square is 2011 inches, what is the area of the square, in square inches? Express your answer in decimal form to the nearest hundredth.
*January 25, 2011*

**College Algebra**

Al gives 1/2 of his marbles to bev. bev gives 1/3 of these to carl. carl gives 1/4 of these to dani. If dani was given four marbles, how many did al have originally?
*January 23, 2011*

**algebra**

Nicole can jog to work in of an hour. When she rides her bike, it takes her of an hour. If she rides miles per hour faster than she jogs, how far away is her work? NEED HELP FAST
*January 21, 2011*

**Math**

After a recent series of home improvements, four couples were having a dinner party to discuss the additions to their homes. Mike had not recently had a new bathroom. Lorraine had not yet done her kitchen, but perhaps would update it next. Chris, who is married to Renée...
*January 16, 2011*

**algebra**

-13=3(x+2)-10
*January 13, 2011*

**Chem**

I don't understand what h is
*January 13, 2011*

**Chem**

What is the energy (e) of electromagnetic radiation having a frequency of 6.32 x 10^20 s^-1?
*January 13, 2011*

**adult education**

use lattice multiplication to find the prduct of 124 x 56
*December 16, 2010*

**accounting**

please help now!!!!!
*December 10, 2010*

**accounting**

This is the question: "Use page 3 of the journal. Jornalize and post the adjusting entries." Can you tell me how to do that?
*December 10, 2010*

**science**

ive been trying to find a report for 5th grade greenhouse effect science. how can i type it to find it?
*December 9, 2010*

**English(how is it?)**

Ya you do this by eating some bananas, there ya go
*December 1, 2010*

**Math**

period = 2ð/(ð/12) = 24 months amplitude = 4000 vertical displacement = 20 000
*December 1, 2010*

**Math**

The population size, P, of owls (predators) in a certain region can be modelled by the function P(t) = 1000 + 100 sin (3.14t/12), where t represents the time in months. The population size, p, of mice (prey) in the same region is given by p(t) = 20 000 + 4000 cos (3.14t/12). ...
*December 1, 2010*

**PHYSICS!!!**

By how many decibels does the sound intensity from a point source decrease if you increase the distance to it by a factor 6?
*December 1, 2010*

**PYSCIS!!!!**

By how many decibels does the sound intensity from a point source decrease if you increase the distance to it by a factor 6?
*December 1, 2010*

**Geometry**

I saw it after I typed in my response to avery. Thank you very much :)
*November 22, 2010*

**Geometry**

Could you please explain why the answer is no?
*November 22, 2010*

**Geometry**

Is it possible for a triangle to have sides with the following lengths: 5, 9, 15?
*November 22, 2010*

**college physics**

A mass of 1 kg is hanging from a spring with a spring constant of 3 N/m. At a distance of 0.2 m below the equilibrium it has a velocity of 1 m/s in the upward direction. What is the amplitude of the oscillation?
*November 21, 2010*

**College Chemistry**

Calculate the vapor pressure of a solution of 0.39 mol of cholesterol in 5.4 mol of toluene at 32oC. Pure toluene has a vapor pressure of 41 torr at 32oC.
*November 19, 2010*

**College Chemistry**

How much ice can be melted at 0oC by the condensation of 1.0 kg of steam at 100.oC? (ΔHfus of ice = 6.01 kJ/mol; ΔHvap of water = 40.7 kJ/mol)
*November 19, 2010*

**Math**

Four balls are simultaneously picked at random from a jar containing 2 red balls, 2 green balls, and 6 yellow balls. What is the probability that exactly two of the selected balls will be red?
*November 15, 2010*

**math**

To find the amount of the discount, you multiply the price by the percentage out of 100. So, 35x.25=8.75 This is the same as (X/35) x (25/100) So you are getting 8.75 off. And the price you pay is.. 35-8.75 = $26.25
*November 15, 2010*

**chemistry**

What reagent would allow you to distinguish between FeCl3 and PbCl2? (As if using an analysis scheme)
*November 15, 2010*

**Chemistry**

What reagent would allow you to distinguish between BaS and NiSO4? (As if using an analysis scheme)
*November 15, 2010*

**Chemistry**

What reagent would allow you to distinguish between AgNO3 and MNSO4? (As if using an analysis scheme)
*November 15, 2010*

**Chemistry**

What reagent would allow you to distinguish between AgNO3 and MNSO4? (As if using an analysis scheme)
*November 15, 2010*

**CHEM**

What reactions does Br- have, ones that would distinguish it as a anion? As in a anion analysis scheme?
*November 15, 2010*

**Chem**

Why is BaSO4 insoluble in HNO3?
*November 15, 2010*

**6th grade**

What is the volume of a chest that is 20 inches by 10 inches by seven and one tenth inches?
*November 8, 2010*

**Physics Help!!! **

With the energy needed to warm up some amount of water from 26°C to 44°C, how high could you lift it?
*November 8, 2010*

**Physics Help!!! solids and fluids**

During a transatlantic flight, you drink a bottle of water and tightly close its lid again. Back on the ground during taxiing to the terminal, you notice that the thin plastic bottle is crushed, and you eyeball it to be only about 80 percent of its original volume (the photo ...
*November 8, 2010*

**Chemistry**

How can you determine which of any two halogens is more active?
*November 7, 2010*

**Spanish 1**

B and C
*November 7, 2010*

**Physics HELP!!! potential energy**

Two identical metal plates with small holes are aligned a distance L=6.7 cm apart. They have a potential difference of 131 Volts. An electron can enter through the hole in the negative plate and exit through the hole in the positive plate. If it enters with a velocity of 3290 ...
*November 3, 2010*

**Physics HELP!!! Potentials and Fields**

Two identical metal plates with small holes are aligned a distance L=6.7 cm apart. They have a potential difference of 131 Volts. An electron can enter through the hole in the negative plate and exit through the hole in the positive plate. If it enters with a velocity of 3290 ...
*November 1, 2010*

**Physics HELP!!!**

A car (mass 920 kg) drives up a hill (height 328 m) in 143 seconds. At the bottom of the hill, it has a speed of 24 m/s, but at the top, it has slowed down to 14 m/s. Neglecting friction, what is the average engine power
*October 31, 2010*

**Physics HELP!!!**

A car (mass 920 kg) drives up a hill (height 328 m) in 143 seconds. At the bottom of the hill, it has a speed of 24 m/s, but at the top, it has slowed down to 14 m/s. Neglecting friction, what is the average engine power
*October 31, 2010*

**Physics**

So would it be 1/2*2.6^2/30
*October 29, 2010*

**Physics**

A flywheel has a moment of inertia of 2.6 kg·m2. What is the average power needed to spin it up from rest to an angular velocity of 100 rad/s in 30 seconds?
*October 29, 2010*

**physics:energy**

Okay I got it thanks for the help.
*October 27, 2010*

**physics:energy**

watts wouldn't be the units correct. My answer is 1456.785
*October 27, 2010*

**physics:energy**

How much power is needed to push a box (mass 27 kg) over a surface (coefficient of friction μk=0.5) with a velocity of 1.1 m/s?
*October 27, 2010*

**Physics: energy**

Thank you
*October 27, 2010*

**Chemistry**

How is the solubility of a solid affected by temperature?
*October 26, 2010*

**math**

Let C(q) represent the cost, R(q) the revenue, and π(q) the total profit, in dollars, of producing q items. a) If C′(67) = 65 and R′(67) = 86, approximately how much profit is earned by item number 68? b) If C′(149) = 120 and R′(149) = 98, ...
*October 8, 2010*

**physics**

thanks, i got them all except for the first one.
*October 4, 2010*

**physics**

true or false If a net force acts on an object, the object's speed will change. An object's velocity will change if a net force acts on the object. If two object have the same acceleration, they are under the influence of equal forces. The net force which acts on an ...
*October 4, 2010*

**English I**

What is feild or Scope? I am writing a book report on Lord of the Fies by William Golding.
*September 28, 2010*

**5th grade math**

16-(3x2)x2 16-(6) x2 16-(12) 4 4is the answer and in middle school when u have parensis u dont need to put an x before the nest multipliction number it means times already
*September 28, 2010*

**8th grade**

$1 for every 4 oz 12/4
*September 26, 2010*

**3rd grade**

they don't really learn algebra they just have a box where a middle or high school student would have a variable
*September 22, 2010*

**Physical Science**

thank you
*September 21, 2010*

**Physical Science**

If you did it wasn't for me :)
*September 21, 2010*

**Physical Science**

Need help please. the once with the ( ) is my answer but i am not sure if it right. Thanks for your help. 15. If the distance from a converging lens to the object is less than the focal length of the lens, the image will be A. real, inverted, and larger than the object. (B). ...
*September 21, 2010*

**4th grade**

My mom says that the glaciers are melting because of global warming.
*September 14, 2010*

**math**

1+j=2(2j+1)
*September 8, 2010*

**English**

Thank you very much.
*July 1, 2010*

**English**

Obviously, the police will use force if you do not cooperate. Is this grammatically correct? I need to write a sentence to show how a comma should be used after introductory words or groups of words.
*July 1, 2010*

**math**

The annual Salary of an electrical engineer is given in terms of the years of experience by the table below. Find the equation of linear regression for the above data and obtain the expected salary for an engineer with 45 years of experience. Round to the nearest $100. x y 2 ...
*June 19, 2010*

**math**

A test is composed of six multiple choice questions where each question has 4 choices. If the answer choices for each question are equally likely, find the probability of answering 3 OR 4 questions correctly. 0.131836 0.032959 0.004639 0.164795
*June 19, 2010*

**algebra**

Solve: 4 sqrt (x) = 8 + 2 sqrt (x) a) (-4) b) (16) c) none d) (4) c
*June 18, 2010*

**math**

simplify cot(-theta)tan(theta)
*June 7, 2010*

**Math**

FiberType HighCalorie LowCalori Totals High Fiber 18 4 22 Medium Fiber 23 6 29 Low Fiber 12 21 33 Totals 53 31 84 3. What is the probability that a cereal would both high calorie and high fiber? In other words, what is P(high calorie and high fiber)? 4. What is the probability...
*May 25, 2010*

**statistics**

Use this table to answer the questions. Height (in inches) Frequency 50-52 5 53-55 8 56-58 12 59-61 13 62-64 11 1. Identify the class width. 2. Identify the midpoint of the first class. 3. Identify the class boundaries of the first class. 4. Give the relative frequency for ...
*May 19, 2010*

**algebra**

I think this is somewhat how you do it. FOIL: (X+4)(X-4) =x^2-4x+4x-16 that simplified is = x^2-16 etc. but idk if i am remotely close
*May 17, 2010*

**Drug Abuse**

Well the moods they get it can effect people around them It can lead to stealing money to buy more drugs and that can hurt the family because then they will lie to cover it up.
*May 16, 2010*

**Chemistry**

What is the equilibrium constant for the reaction: HCOOH(aq)+ OH (aq) <--> HCOO(aq)+ H2O(l) Ka= 1.7 * 10^-4 Kb for the conjugate base= 4.9 * 10^-11 Thank you!
*May 10, 2010*

**algebra **

what is the solution of the following system of equations? 2y + 3x = 8 y = 1/2x a)(2,3) b)(1,2) c)(3,2) d)(2,1) what is the solution if the following system of equations? y = 2x + 10 3y = -4x a)(-3,4) b)(4,-3) c)(5,1) d)(1,5) Thanks you
*April 28, 2010*

**math**

what is the solution of the following system of equations? y = -2/3x y = 1 a) (-2,3) b) (1,-2/3) c) (-3/2,1) d) (1,-3)
*April 28, 2010*

**Algebra**

what is the solution of the following system of equations? 2y - x = 8 y = 2x + 1 a) (5,2) b) ((1,2) c) (2,1) d) (2,5) what is the solution of the following system of equations? y = 0 x = y + 2 a) (2,1) b) (0,2) c) (1,2) d) (2,0) Thanks, molly
*April 28, 2010*

**Chemistry**

Assign oxidation numbers to all species in the redox reactions below. Identify the oxidizing and reducing agents. 1. Fe(OH)2 (s) + CrO42- (aq) → Fe2O3(s) + Cr(OH)4-(aq) (basic)
*April 27, 2010*

**biology**

yes.they do
*April 15, 2010*

**chemistry check my work**

C7H6O3+CH3OH→C8H8O3+H2O In any experiment, 1.50g of salicyclic acid is reacted with 11.20g of methanol. The yield of methyl salicylate, C8H8O3, is 1.31g. What is the percent yield? percent is 77.l1% is this correct?
*April 15, 2010*

**Chemistry**

I am still getting the same answer
*April 14, 2010*

**Chemistry**

C7H6O3+CH3OH→C8H8O3+H2O In any experiment, 1.50g of salicyclic acid is reacted with 11.20g of methanol. The yield of methyl salicylate, C8H8O3, is 1.31g. What is the percent yield? From my understanding the equation is already balanced, correct? My answer: 26.7%, is this...
*April 14, 2010*

**Chemistry**

From my understanding the equation is already balanced, correct? My answer: 26.7%, is this correct? Work: (11.20gCH3OH)(1 mol CH3OH)/32.05gCH3OH=0.3495gCH3OH 0.3495g/1.31g= 26.68%
*April 14, 2010*

**Chemistry**

C7H6O3+CH3OH→C8H8O3+H2O In any experiment, 1.50g of salicyclic acid is reacted with 11.20g of methanol. The yield of methyl salicylate, C8H8O3, is 1.31g. What is the percent yield?
*April 14, 2010*

**chemistry**

how many moles are in a 65L sample of chlorine gas at 10degrees Celcius?
*March 11, 2010*

**8th grade**

what were two goals of american diplomacy in the 1930s?
*March 8, 2010*

**English**

What language was Metamorphoses by Ovid written in?
*February 20, 2010*

**entrepreneur/business**

What are three things you would do to sell a strategy proposal to your management team.
*January 31, 2010*

**english**

indirect object
*January 26, 2010*

**math**

how to solve h/2=3/16
*January 25, 2010*

**Science**

Why is this statement true? With the range of data available, geologists cannot predict exactly where and when earthquakes will occur.
*January 23, 2010*

**Science**

Is this true? If not why? Oceanic crust near the mid-ocean ridge is younger than oceanic crust farther away from the ridge?
*January 23, 2010*

**Spelling**

I'm writing about a position as a sanitation advisor. Which way is the correct way is right. Advisor or Adviser I'm so confused
*January 1, 2010*

**science**

can you tell me more about Jupiter please.\
*December 9, 2009*

**Math;Pre-Algebra**

HELLO ANYONE THERE COULD YOU HELP ME???????????????????????????????????????????????
*December 8, 2009*

**Math;Pre-Algebra**

I can't find the other post please would you resend it to Thd Diana one or to this one both of the names are my nicknames
*December 8, 2009*

**Math;Pre-Algebra**

I Can't find it
*December 8, 2009*

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