Friday

May 29, 2015

May 29, 2015

Total # Posts: 579

**Science**

A 44 g piece of ice at 0 degrees celsius is added to a sample of water at 7 degrees celsius. all of the ice melts and the temperature of the water decreases to 0 degrees celsius. How many grams of water were in the sample?
*June 18, 2010*

**algebra**

Ok, so i did the problem right, but just was not sure what to do with them. sorry for the confusion...thanks for the help!
*June 3, 2010*

**algebra**

because if I use what you gave me would it be (x-3)(x+1) and then what would i do?
*June 3, 2010*

**algebra**

Ok I think I am even more confused: its 3 feet^2 So is it x^2-2x-9=0
*June 3, 2010*

**algebra**

The width of a rectangle is 2 feet less that the length. The area is 3 feet^2. Find the length and width.
*June 3, 2010*

**Math**

(1+ square root of 5)(square root of 3-square root of 5)
*May 5, 2010*

**Math**

(1+ square root of 5)(square root of 3-square root of 5)
*May 5, 2010*

**Math**

2 square root 3(square root of 7- square root of 3)
*May 5, 2010*

**Math-Reiny**

I posted this problem earlier and you answered it for me. The teacher said the correct answer is 3+2y/7-4y. How is that the answer. Below is what you did earlier 3/(y+2) / (7/y-4)) = 3/(y+2) * (y-4)/7 = (3y-12)/(7y+14) or 3(y-4)/[7(y+2)]
*May 3, 2010*

**Math **

3/y+2 over 7/y-4 can u please show me the steps on how you got the answer. Thank You
*May 3, 2010*

**Math**

3/y+2 over 7/y-4 can u please show me the steps on how you got the answer. Thank You
*May 2, 2010*

**math**

Michelle draws a card from a standard deck of 52 cards. She replaces the card and draws a second card. What is the probability that she draws a Heart and then a Spade?
*April 28, 2010*

**Math**

120 Are the last two digits divisible by 4 Are the last three digits divisble by 8 Are the sum of the digits divisible by 9 1048 Are the last three digits divisible by 8
*April 15, 2010*

**Math**

120 Are the last two digits divisible by 4 Are the last three digits divisble by 8 Are the sum of the digits divisible by 9 1048 Are the last three digits divisible by 8
*April 15, 2010*

**math**

Use factoring to solve the equation. (x+6)(x+5)=2
*April 14, 2010*

**Math**

Use factoring to solve each equation. (x+6)(x+5)=2
*April 14, 2010*

**math**

Find the ordered pair using the elimination method. 4x+5y=3 8x+10y=6
*March 21, 2010*

**Algebra**

Well This is what I did to get 40^.5 you know the amount Y and then you already know the function X its Y^x. that's what I just went over today in class
*March 10, 2010*

**Algebra**

wouldn't it just be 40^1/2 that's 6.32 so 6 rounds
*March 10, 2010*

**Math**

Block A & B slide on lubricated surfaces for which friction is .1. knowing that the system is released from rest, determine the velocity of block B after 5 seconds block A is 10 N block B 20N and block B is on a 30 degree incline connected to a at top of the surface
*March 10, 2010*

**physics 101**

A 72.9 kg man is standing on a frictionless ice surface when he throws a 1.6 kg book at 11 m/s.
*March 9, 2010*

**Maath**

Use the elimination method to solve each system. How do you do this? {u+4y=11 7u+3v=2
*February 26, 2010*

**Chemistry **

Select all cases in which the attraction between units in the solid can best be classified as electrostatic bonding forces. CsBrO3 N2O3 Cr(OH)2 Ca3(AsO4)2 Rn Ar None
*February 19, 2010*

**4th grade**

You need 1/2 cup of sugar to make a three-layer cake. How much sugar would you need for a one-layer cake
*February 11, 2010*

**Trig**

Thanks a lot. I also thought the question was written improperly but I spent a lot of time trying to simplify the darn thing! Thanks for your help.
*February 9, 2010*

**Trig**

How do I simplify this? cos4xcos3x-sin4xcos3x I pulled the cos3x out as a common factor but that doesn't really help. Can someone please direct me on this. Thanks!
*February 9, 2010*

**Math-Definition**

Why must we find a common denominator when add/subtract fractions?
*February 4, 2010*

**Math-definition**

What is the prime factorization of a number?
*February 4, 2010*

**college chem**

This has been very helpful!!!!
*January 25, 2010*

**Calculus**

Suppose f(x)=2x^2-x^3 and g(x)= sin(pix/2). a) What is the exact value of the integration from 0 to 2[f(x)-g(x). Find numerical approximation of this value. What does the value of this integral tell you about the areas of the regions beteen the two graph
*January 21, 2010*

**calculus**

To find the answer for b) though, do you have to find the area of the smaller rectangular portion within the region R, and then find the halves of the remaining area of the region? But then how would you work that out to find what b equals? I am confused.
*January 21, 2010*

**Math Business**

This is all the info I got in the question and is probably why I don't really understand what to do with it. Thanks anyway!
*January 19, 2010*

**Math Business**

Janet got 671.50 in cash as the proceeds form a loan of $680. The discount rate was 10% simple interest. Find the discount period. I got 118.5 months but am not sure if I did it correctly.
*January 19, 2010*

**math**

Find an approximation for ã11 rounded to the nearest thousandth.
*January 19, 2010*

**Algebra**

A LARGE PIZZA COSTS $8.95,PLUS 0.65 FOR EACH ADDITIONAL TOPPING.REMI PAID $10.90 FOR A LARGE PIZZA.HOW MAY ADDITIONAL TOPPING DID HE GET?
*December 2, 2009*

**8th grade**

I know the answer but how do i get my starting line ? Vancover recivers 3 times the amount of snow as toyko does together they recive 80 cm i can see that vancover will be 60 cm and toyko 20 cm but i do not know how to do it weird eh ?
*December 1, 2009*

**economics**

In an article about the financial problems of USE Today, Newsweek reported that the paper was losing about $20 million a year. A Wall Street analyst said that the paper should raise its price from 50 cents to 75 cents, which he estimated would bring in an additional $65 ...
*November 20, 2009*

**Physics**

A crate on a floor has an applied force 15 degrees below horizontal of 952N The crate moves with constant velocity. The coefficient of kinetic friction is 0.15. What is the mass of the crate ?
*November 17, 2009*

**Physics**

A car on a roller coaster has a mass of 9528 kg. The car is dragged up the main hill at an angle of 38 degrees ( above horizontal) for a distance of 182 m to the top of the first hill. What work was done to the car ?
*November 17, 2009*

**Physics**

Two people push on a crate. Person 1 pushes in the positive X direction with a force of 25N. The second person pushes in the negative X direction at an angle of 15 degrees below the horizontal with a magnitude of 18.5N the box moves with uniform velocity. What is the force of ...
*November 17, 2009*

**math**

How do yo do Arrays and Expanded Algorithum Ex 23 x17 _ _ _ _ _ _ _ _ _ _ _______ _ _ _
*November 14, 2009*

**economics**

give examples of normal and inferior goods---> what are the similarities and the differences between the 2 groups?
*November 12, 2009*

**world history**

What event led to Great Britain's renewed interest in Egypt in the late 1800s?
*October 22, 2009*

**physics**

a tennis ball is dropped from 1.30 meters above the ground. it rebounds to a height of 1.00 meters. How do I find with what velocity does the ball hit the ground. With what velocity does it leave the ground, and if the tennis ball were in contact with the ground for 0.01 ...
*October 14, 2009*

**Chemistry 151**

How much oxygen is required to completely react with 10 g of C4H10?
*September 28, 2009*

**german**

Hallo. Mein Deutsch ist nicht so gut. Es gibt Fehler in diesem Absatz? Bitte, hilf mir das beseitigen: Heute ist es ein idealer Tag zu einem Naturausflug im Wald machen. Das Wetter ist sehr schön und angenehm. Der Himmel ist wolkenlos. Wir wandern unter den großen ...
*September 22, 2009*

**math algebre2 and trig**

5>4b+9>17 - -
*September 9, 2009*

**Math (Angle Calculation)**

m LB = 7xo + 11o LB = 90 o
*September 7, 2009*

**Math (Angle Calculation)**

m LA = 6xo LA = 180 o
*September 7, 2009*

**Math (Angle Calculation)**

m LA = 6xo LA =
*September 7, 2009*

**Math**

Use the substitution method to find solution sets (x,y) for the following systems of equations: 3x-5y=-11 6x+2y=26
*June 20, 2009*

**english**

on an exam if you are given an essay to read & then deconstruct.....how do you do this Thanks
*June 20, 2009*

**Maths**

How do i show that (a-b)^2(a+b)+ab(a+b)=a^3+b^3 I have come up with the last part ab(a+b)=a^2+b^2, but how do i work out the 1st part??
*June 19, 2009*

**Biology**

Q1. What enzyme could you use to break down the major chemical in the cell wall? A: EDTA but it's not an enzyme Q2. What chemical would you use to break down the major chemical in the cell membrane? A: something like lipases? Please help!!
*June 19, 2009*

**jane**

The answer is zero because the angle between the two vectors is 90. Cos(90)= 0
*June 2, 2009*

**math**

help
*April 16, 2009*

**EXTRA CREDIT**

help
*April 10, 2009*

**math**

your money = $28 + ($18.25 * each week) the $28 is money that you already have in your bank account, and $18.25 how much it will increase by each week. friend's money = $161 - ($15 * each week) the $161 is money your friend has in his bank account, and $15 is how much it ...
*April 2, 2009*

**Organic Chemistry**

Q: Each of the solvent given should effectively separate one of the following mixtures by thin-layer chromatography. Match the appropriate solvent with the mixture that you would expect to separate well with that solvent. Select your solvent from the following. Hexane, ...
*March 7, 2009*

**Organic Chem**

Q: Each of the solvent given should effectively separate one of the following mixtures by thin-layer chromatography. Match the appropriate solvent with the mixture that you would expect to separate well with that solvent. Select your solvent from the following. Hexane, ...
*March 7, 2009*

**Organic Chemistry**

thank you so much Dr. Russ...yes the question assumes the containment comprises only a small percentage of the mixture... p.s.: do u happen to know the answer to my other question as well? under the same assumptions...
*March 2, 2009*

**Organic Chemistry**

How would you purify Fluorene contaminated with ethyl-4-aminobenzoate? What method and solvent you would use? Please help...
*March 2, 2009*

**Organic Chemistry**

I really need help on this question...please help...
*March 1, 2009*

**Organic Chemistry**

How would you purify biphenyl contaminated with fluorene? What method and solvent would you use?
*March 1, 2009*

**armore christian**

what type of note is written by vacationers
*February 3, 2009*

**2nd grade math requestion post**

My child is doing the same worksheet and I have no idea. What does "it has two ones" mean?
*January 20, 2009*

**Biochemistry**

How can I separate glucose and a triacylglycreol mixture? Thanks for any help ,,,,
*December 1, 2008*

**Biochemistry**

What are the structures of the products of a complete acid hydrolysis of glycerophospholipid where the alcohol is ethanolamine, HOCH2CH2NH2 and the fatty acid is stearic acid. Can anyone help on this one? Confused here...
*December 1, 2008*

**space**

I concure with the above. Happy conjunction viewing tonight!
*December 1, 2008*

**Biochemistry**

What are the structures of the products of a complete acid hydrolysis of glycerophospholipid where the alcohol is ethanolamine, HOCH2CH2NH2 and the fatty acid is stearic acid. Can anyone help on this one? Confused here...
*November 30, 2008*

**spanish**

Never seen it myself. Any context here?
*November 30, 2008*

**Biochemistry**

Is anyone familar with the equilibrium reactions that convert the ketone group of fructose into an aldehyde group so fructose give a positive Fehling's Test? I know it will as we received so in class but not sure how the reaction takes place.
*November 29, 2008*

**Another caffeine from tea question**

Thanks Dr. For our intents and purposes I don't believe there to be a reaction. Thank you for your awesome help all the same!
*November 29, 2008*

**Another caffeine from tea question**

Can anyone show me the reaction of sodium carbonate with water to produce bicarbonate and hydroxide as sodium carbonate dissolves? And if any, what is the reaction of tannins and caffeine with this solution? Thanks loads!
*November 29, 2008*

**Chemistry**

I found an interactive model for Lithium when doing a project on Lithium Carbonate etc in class. I was able to incorporate it into a Powerpoint presentation. Somewhere online you may be able to download a file for this. I can hunt down the website that offered some downloads ...
*November 29, 2008*

**English- vocab**

How about unexplicable?
*November 28, 2008*

**Biochemistry**

Thanks for the help! It is much clearer to me.
*November 26, 2008*

**Biochemistry**

Is there a reaction between Na2SO4 with Ch2Cl2? We did a caffeine extraction from tea bags and we are asked why the Na2So4 was added (to remove water I learned) and if a reaction took place. Can someone help? Thanks!
*November 26, 2008*

**St. Peter and Paul**

What do you grease to prevent friction
*November 19, 2008*

**General Physics**

thanks but I know that there are three unknowns and three equations. Getting the formulas are the difficult part.
*October 30, 2008*

**General Physics**

A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle è'2 = 45° from the neutron's initial direction. The neutron's initial speed is 6....
*October 30, 2008*

**Philosophy**

Create a political campaign ad (a poster, a flier, etc.) for two political parties: one party that supports traditional moral and political philosophies and another party that supports modern moral and political philosophies (modern vs. traditional understood in terms of ch. ...
*October 17, 2008*

**11th grade math algebra 2 trig**

5>4b+9>17 - -
*October 9, 2008*

**math**

how to find the "range" of a set of numbers
*September 30, 2008*

**Calculus - Derivatives**

If the original estimate was done by LEFT then the error is inversely proportional to the number of steps and the n = 30 error is (10/30) * -1.654 = -.551, approximately. So the estimate for n = 30 would be -.551 + 4.000 = 3.449 If the original estimate was done by TRAP then ...
*September 29, 2008*

**Physics**

Two packing crates of masses m1 = 10.0 kg and m2 = 6.50 kg are connected by a light string that passes over a frictionless pulley as in Figure P4.26. The 6.50 kg crate lies on a smooth incline of angle 39.0°. a)Find the acceleration of the 6.50 kg crate. m/s2 (up the ...
*September 24, 2008*

**Chemistry-Question 4**

What mass (g) of the solute C3H8O3 should be mixed with 8270 mL of the solvent H2O to produce a solution that is 1.02 m glycerol. Molar Mass (g/mol) C3H8O3 92.09 H2O 18.015 Density (kg/L): C3H8O3 1.261 H2O 0.9982 Name/Formula: glycerol C3H8O3 water H2O
*September 2, 2008*

**Chemistry-Question 3**

A 4.86 kg sample of a solution of the solute chloroform in the solvent (C2H5)2O that has a concentration of 1.91 pph by mass chloroform is available. Calculate the amount (g) of CHCl3 that is present in the sample. Molar Mass (g/mol) CHCl3 119.38 (C2H5)2O 74.12 Density (g/mL...
*September 2, 2008*

**Chemistry**

A solution of hexane in the solvent (CH3)2CO has a mole fraction of CH3(CH2)4CH3 of 0.114. What mass (g) of the solution must be taken if 1690 g of hexane is needed? Molar Mass (g/mol) CH3(CH2)4CH3 100.21 (CH3)2CO 58.05 Density (kg/L): CH3(CH2)4CH3 0.6838 (CH3)2CO 0.7899 Name/...
*September 2, 2008*

**Chemistry**

Here is the other information.. Molar Mass (g/mol) CH3CN 41.05 C6H6 78.12 Density (kg/m3): CH3CN 785.7 C6H6 878.6 Name/Formula: acetonitrile CH3CN benzene C6H6
*September 2, 2008*

**Chemistry**

What volume (mL) of the solvent benzene should be added to 142 mL of the solute CH3CN to generate a solution that is 2.68% by mass CH3CN?
*September 2, 2008*

**statistics**

I thought that 95% was most common. My problem is finding statistical models that do not involve means and other nonpertinent functions.
*August 12, 2008*

**mathematics**

I am trying to prove that the second half of two part names determines the gender of the whole name in a Romance language. I have 30 second parts used only by males in my population and 5 only by females, with one used by both. It seems that I could reject the nul hypothesis ...
*August 12, 2008*

**arithmetic**

You buy a square lot that is 154 yd on each side. What is its size in acres?
*June 28, 2008*

**Math**

Complete the statement. (Round to the nearest hundredth.) 2.1 kg = ________ oz
*June 24, 2008*

**Finance Management**

prefered stock
*June 15, 2008*

**algebra**

multiplying square roots
*May 27, 2008*

**Bussiness**

In what way is each of the following a marketing activity? a. The provision of sufficient parking space for customers at a suburban shopping mall b. The purchase by clothing store of seven dozen sweaters in assorted sizes and colors c. The inclusion of a longer and more ...
*May 14, 2008*

**Humanities**

Throughout the Dark Ages Christians believed in a geocentric universe and such was taught as official Church doctrine, as seen in Dante's works, yet this view had come from a Greek (a pagan) who lived a long time ago. Name the Greek.
*April 24, 2008*