Friday

February 12, 2016
Total # Posts: 991

**chemistry**

Please help. My teacher never went over crystal lattices and the book doesn't cover it either :( Copper crystallizes in a face-centered cubic lattice. If the edge of the unit cell is 351pm, what is the radius of the copper atom?
*December 10, 2012*

**Social Studies **

In what ways did China And Europe parallel each other in their development until the sixth century CE? How did they diverge after that?
*December 8, 2012*

**math**

in order to increase the mean of 6 numbers by 3, what would the total sum of the increase be? A. 3 B.9 C.12 D.16 E.18
*December 7, 2012*

**MATH urgent**

Hello!! 1. find the third derivative of f(t)=(t-1)/(t+1) 2. y= x^(x^2) ; dy/dx please help! thank you!
*December 6, 2012*

**HEALTH HELP PLEASE!!**

Fats help maintain your cell membranes. (1 point) True False 12. Your body does not use energy when you sleep. (1 point) True False 13. People with anorexia nervosa eat large amounts of food and then purge. (1 point) True False 14. Your body image is the way others see your ...
*December 5, 2012*

**maths**

Let p(x) = 1 + 4x + 2x^2 + 2x^3 in Z5[x]. Find all roots of p(x), and write p(x) as a product of irreducible polynomials.
*December 5, 2012*

**maths**

differentaite w.r to x h(x) = arcosh(x^3 + 2).
*November 25, 2012*

**pre cal**

How lnog will it take for an investment of $1000 to double in value if it earns 5% coumpounded weekly?
*November 24, 2012*

**Maths**

in the following rings find all units, Zero divisors and idompotent elements and determine whether the ring is a field. a)Z2 b)Z5 c)Z10 NB z is integers( positive or negatives including zero z is integers( positive or negatives including zero
*November 20, 2012*

**physics**

An object moves along a circular path with a constant speed, |⃗vo|. (Semi Circle with point A on one side point B on the other. Looks like a 90 degree angle with points A and B on either side of the hypotenuse.) The average acceleration in going from A to B is 1. zero 2...
*November 8, 2012*

**Maths**

steve
*November 8, 2012*

**Maths**

(cos8x+cos2x)/2 steve is it right
*November 8, 2012*

**Maths**

cos3xcos5x how do rewrie this using trigmetric finctions Steve thanks
*November 8, 2012*

**Maths**

Steve help please
*November 8, 2012*

**Maths**

how did you do sin2x cos4x = (sin6x + sin2x)/2 what os the formula I need to use
*November 8, 2012*

**Maths**

1)how do you simplify 3xcos5x using trigometric functions 2)how do you simplify sin2xcos4x using trigometric functions
*November 8, 2012*

**maths**

thanks steve SO DOES ANSWER CHANGE IF ABELIAN?
*November 6, 2012*

**maths**

let G be a group with operation . and let p,q be two elements of G. simplify p.q.q.q^-1.p^-1.q^-1 as much as possible.does answer change if G is ABELIAN?
*November 6, 2012*

**MATHS**

prove by mathematical induction that 7^n+4^n+1 is divisible by 6
*October 31, 2012*

**Geometry**

my geometry problem set says "find the ratio of CG : CB" CG=6.3 and CB=19 so to find the ratio i would divide the 19 by 6.3 (we have to round so it would be a 3:1 ratio) or would it be the other way around? i think it's the 19/6.3 but i'm not sure...
*October 25, 2012*

**math **

I am a 3 digits number less than 200. the tenths place is 2x more than the ones place. the number in the ones place is 2. what number am i?
*October 24, 2012*

**orgoo**

calculate how to make 10 mL of 15:85 ethyl acetate:hexane solution from 2 mL of 5:95 ethyl acetate:hexane, using pure hexane and pure ethyl acetate.
*October 13, 2012*

**writing**

I have to write an essay about how Morrison uses power stuggle in Beloved to enhance the meaning of her work. I think I have some idea, but I'm just sitting here numberless. This essay is due in about 2 days. Can you help me ASAP? Thanks
*October 12, 2012*

**Physics**

1. mg/(cos(sin^-1(r/L)))
*October 10, 2012*

**world civilization**

what was the relationship between politics and science in the early modern world?
*October 4, 2012*

**Chemistry**

A particular oral contraceptive contains 0.041 mg of ethinyl estradiol in each pill. The formula of this compound is C20H24O2. How many moles of ethinyl estradiol are there in one pill? I need help in approaching this
*October 3, 2012*

**math**

Is 4,564,282 a prime or composite number?! Seriously, I have absolutely no idea!!!!!!
*September 26, 2012*

**Chemistry H.**

5.07301149
*September 23, 2012*

**orgoo**

what are the products of the reaction: HC3OH + (Na+NH2-) ?
*September 14, 2012*

**orgo**

What is the pH of a 5.00E-2 M solution of acetylsalicylic acid, pKa = 3.52.
*September 14, 2012*

**chem**

calculate the pH of 5x10^-2 M of benzoic acid with pKa= 4.19
*September 14, 2012*

**math**

what is the rule for the following: x = 1,2,3 y = 2,6,12
*September 12, 2012*

**Physics**

A bug completes one lap along the edge of a circular planter of radius 22.4 cm in 16.45 s. How fast was it traveling? Answer in units of cm/s.
*September 9, 2012*

**aglebra 2**

determine whether the equation has one solution, no solution, or is an identity. 5y+3=26
*September 6, 2012*

**chem**

P1V1/T1=P2V2/T2 ; basic proportion. STP mean standard temperature and pressure P1=700 torr V1=8 Liters T1=293K P2=standard pressure=1 atm=760 torr V2=unknown T2=standard temperature=273K i hope you can follow my though process. (700*8)/293=(760*V)/273 V=6.87
*August 13, 2012*

**Dressmaking and design**

a straight facing can be used to finish?
*July 24, 2012*

**Bio HELP!!!!**

what is the name of the process throughh which polypeptides, polysaccharides or triglycerides are catabolised (broken down)?
*July 7, 2012*

**math**

Use the midpoint formula
*July 7, 2012*

**chemistry**

.5566
*June 21, 2012*

**math equations**

Solve x = log3 15
*June 12, 2012*

**Chemistry**

how much chlorine, Cl 2, do you need to order to react completely with 500 kg of platinum, Pt, to make cisplatin, PtCl 2(NH 3) 2?
*June 5, 2012*

**Algebra 2**

five chips numbered 1 through 5 are placed in a bag. A chip is drawn and replaced. Then a second chip is drawn. Find the probability that the first chip is even and the other one is odd.
*May 30, 2012*

**Chemistry**

Exothermic means you release energy. D, freezing water, means the water releases heat in order to freeze. This release of heat, aka energy, makes it exothermic. The other answer choices require energy, making them endothermic.
*May 22, 2012*

**World History**

China had the largest economy still, thankfully I got it right. Thanks though!
*May 22, 2012*

**World History**

At the end of the eighteenth century, _______ had the largest economy in the world. A. India B. Spain C. China D. Britain I've researched this question like crazy, but I just can't seem to determine a clear answer. I know it's between China and Britain. Britain had...
*May 22, 2012*

**biology**

Need help with FOV area (mm2) totally confused? im confused i have the FOV diameter they are: 4x = 5 10x = 2 40x = 0.5 a classmate told me she thinks the area for 40 x is: pi(5/2)^2 = 19.6 not sure if thats true or how to do it for the low and medium, magnification. please ...
*May 22, 2012*

**math**

If there are 50 floats in a parade, how many ways can a first place and a second place trophy be awarded?
*May 7, 2012*

**Math**

uh i think its 1/1024
*May 2, 2012*

**math**

the hypotenuse of a right triangle is 3 less than 4 times the shortest leg. if the longest leg is 24cm, how long is the hypotenuse
*April 30, 2012*

**algebra 2**

write an explicit formula for the sequence of 1/2, 3/7, 1/3, 5/19, 3/14
*April 30, 2012*

**chemistry**

An air sample contains 0.032%CO2 .If the total pressure is 756mmHg , what is the partial pressure ofCO2 ?
*April 28, 2012*

**chemistry**

A sample of gas has a mass of 0.555g . Its volume is 114L at a temperature of 80degrees C and a pressure of 744mmHg .Find the molar mass of the gas
*April 28, 2012*

**chemistry**

An experiment shows that a 111ml gas sample has a mass of 0.161g at a pressure of 725mmHG and a temperature of 36degrees C.What is the molar mass of the gas?
*April 28, 2012*

**chemistry**

How many moles of gas must be forced into a 3.1L ball to give it a gauge pressure of 9.8psi at 22degrees C? The gauge pressure is relative to atmospheric pressure. Assume that atmospheric pressure is 14.5psi so that the total pressure in the ball is 24.3psi .
*April 28, 2012*

**algebra 2**

Carlos wants to make a scale drawing of a rectangle. he wants the rectangle to have a length of (x-1) units and an area of 1-x/x^2+1 square units. What can you say about how wide the rectangle should be? Explain.
*April 26, 2012*

**chemistry**

Calculate the pressure drop expected on hydrogenation of the mixture of 5.00 ml of cyclohexene and 35 ml of cylclohexane. I know I have to use PV=nRT but this is all I know we are starting at 60 psi of pressure. We also used hydrogen gas if that helps
*April 25, 2012*

**chem**

calculate the concentration of borate ion for a titration when 6.0998g borax is dissolved in 100mL of water and titrated with 25.5mL of HCl
*April 24, 2012*

**Chemistry**

What is the pH of a 2.5 x 10-2 M HCl solution? I'm so confused how to find this :(
*April 24, 2012*

**chem**

A hydrofluoric acid buffer solution has the following concentrations: [HF]=0.43M [F-]=0.45M If 40 mL of 0.1M NaOH is added to 500 mL of the buffer, what is the resultant pH?
*April 19, 2012*

**Physical Science**

The conversion of water to ice is considered a physical change, whereas the conversion of iron to rust is considered a chemical change. Why?
*April 19, 2012*

**calculus**

what is the linear approximation of f(x)=x^3-x at x=2
*April 19, 2012*

**chem**

what is the ph of a solution that results from adding 30 mL of .015M KOH to 50 mL of .015 M benzoic acid?
*April 17, 2012*

**Geology**

Granite age for Scottish highlands
*April 16, 2012*

**English**

how has the world changed for the better? besides technology & medicine
*April 15, 2012*

**trig**

if one of a quadratic equation is 1/2-2i, what is the equation. the other root is 1/2+2I but i dont know how to find the equation
*April 5, 2012*

**American Government**

Who has to run for re-elecition every two years?
*March 27, 2012*

**Social studies**

Why would the Chinese want to limit population growth?
*March 25, 2012*

**chemistry**

Given that [O3]=4.0× 10–4 M and [NO]=3.0× 10–5 M at t=0, calculate the rate of the reaction at t=0.
*March 23, 2012*

**math**

1) Why should we clear fractions when solving linear equations and inequalities? Demonstrate how this is done with an example. Why should we clear decimals when solving linear equations and inequalities? Demonstrate how this is done with an example.
*March 21, 2012*

**History**

Little Richard, Chuck Berry, Fats Domino, Frankie Lymon and... Martin Luther King?
*March 18, 2012*

**algebra**

X*(x+10)=880ft X square=870 ft u find the square root of 870 and plug it in to the first equation
*March 17, 2012*

**chemistry**

Calculate the number of grams of h2c2o4.2h2o needed to prepare exactly 250mL of a 0.200 N solution of the acid?
*March 16, 2012*

**algebra**

Make a function table for each function. The cost of 1 to 5 books at $2. 95 each.
*March 13, 2012*

**Math - HELP !**

turn 62% into a fraction which is then .62 then mulitply 50 by.62 and you get 31 and that is your answer
*March 10, 2012*

**physics**

Tarzan plans to cross a gorge by swinging in an arc from a hanging vine. If his arms are capable of exerting a force of 1820 N on the rope, what is the maximum speed (in meters/second) he can tolerate at the lowest point of his swing? His mass is 83.0 kg, and the vine is 11.0 ...
*March 10, 2012*

**English-Poetry**

What does riprap symbolize in Gary Snyder’s poem, “Riprap”? A.the barriers of friendship B.the needless walls we build around ourselves C.the journey and the workmanship of the trail of life D.the things we bother ourselves with in life I think the answer is C...
*March 9, 2012*

**physics**

I did that and I am still getting the wrong answers, do I have to convert anything?
*March 9, 2012*

**physics**

A satellite is in circular orbit above the Earth at an altitude of 2000 km. What is the orbital speed of the satellite? what is the equation i need to use
*March 9, 2012*

**Poetry**

What does riprap symbolize in Gary Snyder’s poem, “Riprap”? A.the barriers of friendship B.the needless walls we build around ourselves C.the journey and the workmanship of the trail of life D.the things we bother ourselves with in life I think the answer is C, ...
*March 8, 2012*

**PHYSICS**

A wet bar of soap slides freely down a ramp 12.0 m long, inclined at 74.0 degrees. How long (in seconds) does it take to reach the bottom? (Neglect friction.)
*March 7, 2012*

**13**

the answer is C
*March 4, 2012*

**Chemistry**

What amount of hydrogen peroxide should result when 1.21 g of barium peroxide is treated with 25.1 mL of hydrochloric acid solution containing 0.0289 g of HCl per mL?
*February 29, 2012*

**Math**

5e+15p</=60 How many combinations of excersises (e) and problems (p)can you do in exactly one hour(60 minutes)? I've found 5 combinations: 9e,1p 3e,3p 6e,2p 0e,4p, 12e,0p Are there anymore? What method would you use to solve this type of problem? Thanks for the help!
*February 25, 2012*

**Statistics**

Problem 1. Three supermarket chains in the Denver area each claim to have the lowest overall prices. As part of an investigative study on supermarket advertising, the Denver Daily News conducted a study. First, a random sample of nine grocery items was selected. Next, the ...
*February 25, 2012*

**English-please help!**

You don't need to remeber the whole story, just ascertain answers from the given text, I'm sure.
*February 21, 2012*

**English-please help!**

It must be nice," she said. "It must be very nice. I wish women could do such things." "It ain't the right kind of a life for a woman. Her upper lip raised a little, showing her teeth. "How do you know? How can you tell?" she said. "I don...
*February 21, 2012*

**English**

Please help. My answers are the ones with a (*) next to them. I'd like to get this assignment done tonight :)
*February 20, 2012*

**English**

I put an asterixs (*) next to my answers. I want someone to double-check, not do my work for me :)
*February 20, 2012*

**English**

It must be nice," she said. "It must be very nice. I wish women could do such things." "It ain't the right kind of a life for a woman. Her upper lip raised a little, showing her teeth. "How do you know? How can you tell?" she said. "I don...
*February 20, 2012*

**Statistics homework distribution problem? **

i need help with how to solve this: consider a normal distribution with mean 30 and standard deviation 2. what is the probability a value selected at random from this distribution is greater than 30? the book gives me the answer but i need to know how to solve it. please help?
*February 20, 2012*

**math**

How can you use subtraction to complete an addition pattern? use this exercise as an example: 32, 39, 46, 53, 60, 67.
*February 19, 2012*

**English**

Identify the participial phrase in the sentence below. Rising early, I saw the sun come up. A.Rising early B. saw the sun C. come up D. in the distance Thanks for the help :)
*February 19, 2012*

**math**

In 1920, the record for a certain race was 45.5 sec. In 1970, It was 44.5 sec. Let R(t)=the record in the race and t=the number of years since 1920 Predict the record for 2003 and 2006
*February 18, 2012*

**Chemistry**

17.6 mL
*February 17, 2012*

**Physical science**

Is it possible for an object to have more kinetic energy but less momentum than the other object? Less kinetic energy but more momentum? *i know the answer to both questions is yes, however, i cannot think of examples ??
*February 11, 2012*

**College Algebra**

Solve the problem. Jon has 1162 points in his math class. He must have 86% of the 1500 points possible by the end of the term to receive credit for the class. What is the minimum number of additional points he must earn by the end of the term to receive credit for the class?
*February 10, 2012*

**English-Metaphors**

So what do you think the answer is? I'm starting to think it may be a.
*February 8, 2012*

**English-Metaphors**

Which of the following excerpts from Frost's poems is NOT a metaphor? A.Magnified apples appear and disappear / Stem end and blossom end B.Spring is the mischief in me C.My apple trees will never get across / And eat the cones under his pines, I tell him. D. Give the ...
*February 8, 2012*

**intermediate algebra**

A triangle is such that the largest angle is 11 times the smallest angle. The third angle is 27° less than the largest angle. Find the measure of each angle. (Enter solutions from smallest to largest.)
*February 5, 2012*

**intermediate algebra**

Two complementary angles are such that one is eight times larger than the other. Find the two angles.
*February 4, 2012*