Thursday

October 8, 2015
Total # Posts: 1,088

**calculus**

what is the derivative of 4(x^2-1)^-1/2
*March 15, 2009*

**Physics**

What is the difference between an inelastic and an elastic collision? What does kinetic energy have to do with all of this? Give an explanation that explains the role of momentum, kinetic energy, and such in collisions. I think elastic collisions is when the things bounce of ...
*March 10, 2009*

**college math**

find the integral of x^2 e^-xdx with the limits of negative infinity to zero. so far, I have, lim as t approaches negative infinity of (-e^-x [x(x+2) + 2] from 0 to t does this converge or diverge?
*March 9, 2009*

**college math**

Prove: there exists x and y for c=ax+by iff gcd(a,b)/c.
*March 8, 2009*

**college math**

thanks, I'll try these methods
*March 8, 2009*

**college math**

the exact problem states: for an arbitrary integer a, verify that 3/a(2a^2+7). This is a problem out of a number theory book included in the section involving gcd.
*March 8, 2009*

**college math**

Yes, you are to prove that 3 divides [(a)(2a^2+7)] probably by using the greatest common divisor.
*March 8, 2009*

**college math**

Prove: 3/ a(2a^2 + 7)
*March 8, 2009*

**Chemistry Lab**

Hi guys, I thought it would be due to aromaticity breaking difficulty? In the bromination reaction, why are the double bonds which are par t of the phenyl r ing not brominated? A. We only added one equiv alent bromine. B. T he phenyl r ing is aromatic and aromaticity is diffic...
*March 5, 2009*

**5th grade Reading**

Its the syllable with the loudest stress. The accent is usually on the syllable before the suffixes such as ion, ical, and ity.
*March 1, 2009*

**General Question**

How does this statement go: A slim to none chance or a slim to nothing chace
*March 1, 2009*

**calc**

Using L'Hospital's Rule, find, the limit as x approaches 0 of x^(sinx)
*February 26, 2009*

**college math**

Using L'Hospital's Rule, find, the limit as x approaches 0 of x^(sinx) thank you in advance to any help.
*February 26, 2009*

**college math**

how do you take the derivative of e^(x^2)?
*February 26, 2009*

**collegte math**

Using L'Hospital's rule: find, lim as x approaches (-) infinity of xsin(1/x)
*February 26, 2009*

**Economics**

How is elasticity of supply related to elasticity of demand? Is this correct? I know that the terms supply and demand refer to the behavior of people as they interact with one another in markets. Buyers determine demand and sellers determine supply. Just as we can measure how ...
*February 26, 2009*

**Social Studies**

1. The president of the United States is elected by the electoral college. What type of system is this? 2. In ancient Athens (Greece) tribes and generals took turns at power. This is an example of what type of political system? 3.What type of political system is headed by ...
*February 26, 2009*

**Chemistry**

What is the difference between an amino acid and a protein? How does this difference in structure affect biological function?
*February 23, 2009*

**Chemistry**

State two differences between DNA and RNA.
*February 22, 2009*

**Chemistry**

Give an example of a disaccharide
*February 22, 2009*

**Chemistry**

The question is with a lab that I have already done. Here are my numbers moles of malachite in 1g 221.12 moles of CuO produced 141.57 ratio of moles of CuO produced per moles of malachite decomposed 79.55 Use the mole ratio of CuO produced per mole of malachite to write a ...
*February 22, 2009*

**Chemistry**

I need to write a balanced equation for this problem and am having difficulty doing so. The question is this: use the mole ratio of CuO produced per mole of malachite to write a balanced equation for the malachite decomposition reaction. Assume that CO2 is also a product of ...
*February 22, 2009*

**Chemistry**

I need to write a balanced equation for this problem and am having difficulty doing so. The question is this: use the mole ratio of CuO produced per mole of malachite to write a balanced equation for the malachite decomposition reaction. Assume that CO2 is also a product of ...
*February 22, 2009*

**Chemistry**

Why do carboxylic acids generally have higher melting and boiling points than alcohols, ketones, and aldehydes of comparable mass?
*February 21, 2009*

**Chemistry**

Explain why alcohols of lower molecular weight are generally soluble in water but those of higher molecular weights are generally not.
*February 21, 2009*

**college math**

How do you prove: If a/b, then a/bc So far I have: Since a/b, then b=ac where c is an integer. Now where do i go?
*February 21, 2009*

**Chemistry**

What are amine salts?
*February 18, 2009*

**Chemistry**

An alcohol has an OH functionally in it. Do you expect it to be a base? Why, or why not?
*February 18, 2009*

**Economics**

How does the government participates in a mixed economy? Based on principles of the free market, allowing some government intervention. Is there anything else i can say?
*February 18, 2009*

**college math**

how do you integrate (cos^2 x)^4
*February 15, 2009*

**college math**

thnx
*February 15, 2009*

**college math**

is the integral of 1/x^2, 2x ln of the absolute value of x^2?
*February 15, 2009*

**college math**

thank you. i understand now.
*February 15, 2009*

**college math**

how do you integrate ln(x^2+1)dx?
*February 15, 2009*

**math**

yes, I got this answer, as well THANKS
*February 15, 2009*

**math**

how do you integrate (3x+1)/(x-1)x^2 dx?
*February 15, 2009*

**math/ cal**

thank you for your answer, but this example problem is not the same as mine. the example problem is (sin (x))^2, in other words the whole quantity is squared. mine is just sin of x^2. any suggestions here?
*February 15, 2009*

**math/ cal**

how do you integrate sin (x^2) dx?
*February 15, 2009*

**Chemistry**

Name an isomer of pentane (that is not cyclic) and write down its structure.
*February 14, 2009*

**adult education**

I am currently studying for the cbest exam in all three areas, math, reading and writing. Does anyone have any current information that would help better prepare for these tests.
*February 14, 2009*

**Chemistry**

What is the three dimensional structure of methane? Why?
*February 14, 2009*

**Chemistry**

What is the difference between hydration and hydrogenation reactions?
*February 14, 2009*

**CHemistry**

Why do cis and trans isomeric compounds exhibit different properties?
*February 14, 2009*

**Chemistry**

Why is the benzene molecule represented as " a flat cyclohexane with a ring inside?"
*February 14, 2009*

**Chemistry**

Why is benzene much less reactive than 1, 3, 5-cyclohexatriene?
*February 14, 2009*

**Chemistry**

Are these compounds organic, if not what are they? Kmno4 CH3OH C6H6 PdC12 CH3CO2H
*February 14, 2009*

**Chemistry**

What is the formula of 1,3-butadiene?
*February 11, 2009*

**Chemistry**

Name one structural and one chemical difference between acetylene and ethylene. Give reasons.
*February 11, 2009*

**Chemistry**

Name an isomer of pentane (that is not cyclic) and write down its structure.
*February 11, 2009*

**Chemistry**

What is the three dimensional structure of methane? Why?
*February 11, 2009*

**Chemistry**

What causes cycloalkanes to have two less hydrogen atoms than similar alkanes that are open chain ones?
*February 11, 2009*

**Economics**

1. The main disadvantage of using shells as money, instead of coins, would be a lack of: a. durability b. portability c. uniformity d. divisibility I think its B. portability?
*February 11, 2009*

**Economics**

Thank you, for your feedback. I just read another part of my economic book and B is definitely the answer.
*February 11, 2009*

**Economics**

1. Products that would be used in calculating GDP include: a. Toys manufactured in China at a factory owned by a U.S. company b. cars manufactured in Tennessee at a factory owned by a Japanese automobile company c. plastic manufactured in Kentucky and sold to toy manufacturers...
*February 11, 2009*

**CHemistry**

In a clean 250mL volumetric flask, 125mL of a 6.0 M hydrochloride acid was added. This was then diluted with more water to reach the 250mL mark. What is the molarity of the acid at this time?
*February 7, 2009*

**Chemistry**

calculate the final concentration if 4.0 L of 1.5 M NaC1 and 2.0 L of 3.0 M NaC1 are mixed.
*February 7, 2009*

**AP CHEM**

How did you get part B?!
*February 7, 2009*

**science**

What kind of materials block sound.
*February 5, 2009*

**Physics - Waves**

0.78352941
*January 26, 2009*

**Physics - Waves**

0.141525
*January 26, 2009*

**Socialogy and cultural diversity**

Are Irish Americans considered a subordinate group in American History? I need to do a paper on a subordinate group and I was thinking of using Irish Americans.
*January 16, 2009*

**Chemistry**

91.7g of HCl solution was added to the calorimeter and brought to a constant temperature. Then 0.5278g of MgO was added and the temp rose from 25.65C to 32.60C and held steady. Then 0.0185g of Mg was added and the temp again rose from 30.35C to 32.20C Calculate the Cp for the ...
*January 14, 2009*

**chem**

If a cube with edges of 1.000 cm weighs 25.68 g, what would the mass of a cube of the same material with sides 2.63 cm in length be?
*January 13, 2009*

**Chemistry**

91.7g of HCL solution was added to the calorimeter and brought to a constant temp. Then 0.5278g of MgO was added and the Temp rose from 25.65C to 32.60C and held steady. Then 0.0185g of Mg was added and the temp again rose from 30.35C to 32.20C. Calculate the Cp for the ...
*January 12, 2009*

**spanish help**

1. soy 2.somos 3.son 4.estoy 5.fue 6.es , era ?? 7.es 8.esta
*January 9, 2009*

**spnaish HELP**

1. Is wrong. Its... Quiero ir a Colorado para Navidad 2. Has comprado algo para la cena ? 3. Este celular es solo para emergencias. 4. Ella siempre viaja en autobús.
*January 9, 2009*

**grammer**

Thanks Ms.Sue and Writeacher...website was a big help. My son now has a better understanding subject/predicate! very happy :)
*January 6, 2009*

**grammer**

what is a predicate? My son's assignment is to circle the action verb and underline the predicate. I've tried to explain what a predicate is, but he still doesn't understand.
*January 6, 2009*

**science**

Appendix
*January 6, 2009*

**home economics**

how does the increase in use of ethanol in the United state impact other place in the world?
*January 4, 2009*

**Calculus**

The curve f(x)=-x^4+2x^2+x has a tangent at the point (1,2). Is this line tangent to the curve at another point and, if so where?
*January 4, 2009*

**math need help with this**

If on the first of January a savings account has a balance of $3200 what amount will be in this account after three years if the bank gives 6% per year interest compounded quarterly?Assume that there are no deposits or withdrawals of money during these three years.
*December 17, 2008*

**algebra with pizzazz**

What is it called when a sea bird lands on a channel marker?
*December 16, 2008*

**math**

A dealer offers a computer software program whose list price is $500 at a 19% discount. She will give an extra 3% discount if paid in cash. What is the selling price if payment is made in cash? If 500=81%, _____=78% (this comes from subtracting 19% from 100%, then subtracting ...
*December 16, 2008*

**math**

need help in 1996, the civilian labor force of the united states included 127 million people, and 5% were unemployed. how many people in the cilvilian labor force were unemployed?
*December 16, 2008*

**math**

the two parallel bases of a trapezoid are 5inches and 6 inches long. the altitude of the trapezoid is 4inches. what is the area of the trapeziod? i got 15
*December 5, 2008*

**science**

~Which type of plate is thicker? continental or oceanic [i know that oceanic plates are denser but that doesn't exactly mean its thicker.] ~Which type of plate, continental or oceanic, is older?? [on this question i have no clue] Thanks for any help! <3
*November 29, 2008*

**chemistry**

THANX I AM IN 5TH GRADE AND THIS WAS 4 A PROJECT
*November 21, 2008*

**chemistry**

I NEED A MODEL OF THE ELEMENTS OF CHLORINE
*November 21, 2008*

**Precalculus with applications**

Determine whether the system of inequalities is infeasible, has alternate optimal solutions, or is unbounded for the function f(x,y)=2x+y
*November 18, 2008*

**english**

what does the word daff remind you off?
*November 16, 2008*

**MATH**

please help execute the indicated multiplications. (x-2)(x^2+2x+4)
*November 14, 2008*

**MATH**

combine like terms is this correct (5x^2+6x+8)+(6x^3 +2x^2-4x) = 6x^3+7x^2+2x+8
*November 14, 2008*

**math**

please help me out here the problem is combining like terms. 4x^3-3x^3+9x+2x I got 1x^3+11x but when i asked a friend they said it would be x^3+11x could u help me out please. also could you tell me if this probem is correct as well (10x^3+6x^2+4x) -(8x^3+2x^2-3x)= 18x^3+4x^2+...
*November 14, 2008*

**US history**

we are supposed to create an advertisement for a revolutionarynewspaper- around the constitutional convention time.. what products do you think they would sell at that time??? thank you!
*November 10, 2008*

**Math**

oh and this is grade nine math
*November 6, 2008*

**Math**

it says the knights banquet hall uses the equation 25n-c+1250=0 determine the cost for a hall rental the legions banguet hall usues the equation 30n+995-c=0 to determine the cost for thier hall rental express each equation in slope y-intercept form- c=mn+b identify the fixeed ...
*November 6, 2008*

**college algebra**

Identify the units on x in each of the following equations. (a) x= yz (both y and z are measured in feet) (b) x=3y^2 (y is measured in inches) (c)x = t^3 (t is measured in seconds) (d) x 4F^2 d (both F and d are measured in meters) 4. In an exponential expression such as A = ...
*November 4, 2008*

**Science- Chemistry**

THANK YOU!
*October 28, 2008*

**Science- Chemistry**

What does NaHco3 + HCl produce?
*October 28, 2008*

**math**

75 150 divided by 2 equals 75
*October 27, 2008*

**10th grade english**

um how do u write an extended metaphor
*October 23, 2008*

**science**

THANK YOU SOOOOOOOO MUCH!
*October 20, 2008*

**science**

Why are there more warm currents than cold currents in oceans?
*October 20, 2008*

**Algebra**

Word Problem: Jack mows the lawn in 4 hours, mary mows the lawn in 5 hours. how long will it take them if they mowed the lawn together? I have a hard time figuring out which formula to use to solve a problem in a word problem can anyone help and tell me how to set up the ...
*October 18, 2008*

**Algebra; check please?**

A television has a diagonal of 10 inches and a width of 8 inches. what is it's height? i think the answer is nine inches, am I correct? If I am not how do I find the answer?
*October 16, 2008*

**Algebra**

Thank you!
*October 16, 2008*

**Algebra**

Can someone help me figure out what formula I am to use for this word problem? I am having a hard time. If the sides of a square are lengthened by 7cm the area of the square becomes 121cm^2. What is the length of a side of the orgional square?
*October 16, 2008*

**Comprehensive Grammar**

i am not good at this i the reason i chose these answers was they sound right. i dont know the reason behind it.
*October 13, 2008*

**Comprehensive Grammar**

these are the answers i just need help on why they are the answers. Subject-verb agreement 1a. Did you know a famous animal-rights activist has criticized horseracing because of the dangers involved? Subject-verb agreement 2b. Peer editing academic papers requires critical-...
*October 13, 2008*