Wednesday

October 1, 2014

October 1, 2014

Total # Posts: 992

**Biochemistry**

Find the net charge of cysteine at pH 8.75 using the follwing pka values: carboxyl group has pka=1.9 amino group pka= 10.7 side chain=8.4
*January 19, 2009*

**Math**

Suppose you have a lemonade stand, and when you charge $1 per cup of lemonade you sell 50 cupes. But when you raise your price to $2 you only sell 25 cups. Write an equation for the nuber of cups you sell as a function of the price you charge. Denote "C" for number ...
*January 19, 2009*

**French 1**

grand-pères, granparents petite-fille, grandaughter petit-fils grandson
*January 8, 2009*

**algebra**

t/3<13
*January 7, 2009*

**English/Latin Translation**

translate this sentence for me please into latin? -the journey to the spanish town is long but we shall walk with great speed?
*January 7, 2009*

**English/Latin Translation**

How do you say "live free" in latin?
*January 7, 2009*

**AP Stats**

thanks for your help!!:)
*January 2, 2009*

**AP Stats**

Surveys indicate that 5% of the students who took the SATs had enrolled in an SAT prep course. 30% of the SAT prep students were admitted to their first choice college, as were 20% of the other students. You overhear a high school student say he got into the college he wanted...
*January 2, 2009*

**algebra**

An architect makes $75.25 per hour. What will his/her gross income be after completeing a 95-hour project?
*December 14, 2008*

**algebra**

A salesperson earns a salary of $500.00 per week, plus a commision of 2% of her total weekly sales. write an algebraic expression that computes the total weekly salary. Let m represent the total weekly sales.
*December 14, 2008*

**Chemistry**

What volume will the following quantities of gases occupy at STP? 5.0 g of H(2) subscript=2 228.0 g of N(2) subscript=2
*December 11, 2008*

**chemistry**

1. how many grams are in 5.66 mol of CaC03 (3 is the subscript)? --------------------------------------- mass= 5.66 mol CaCO3 x mass/1 mol CaCO3 How do i finish this off? 2. find the number of moles in 508g of ethanol (C2H6O)? 2 and 6 are subscripts
*December 10, 2008*

**chemistry**

how many grams are in 5.66 mol of CaCO3? (the three is the subscript)
*December 10, 2008*

**English**

Discuss Dickens' use of symbol in GREAT EXPECTATIONS- symbolic names, settings, characters, actions, etc.
*December 7, 2008*

**stats: need help please**

4.34 Keno is a favorite game in casinos, and similar games are popular with the states that operate lotteries. Balls numbered 1 to 80 are tumbled in a machine as the bets are placed, then 20 of the balls are chosen at random. Players select numbers by marking a card. The ...
*December 7, 2008*

**Chemistry**

Thank you. I rechecked my problem. Should the power be positive? Or is it another power instead?
*December 6, 2008*

**Chemistry**

Calculate the wavelength of the yellow light emitted by a Sodium Lamp if the frequency is 5.10 X 10^14 Hz. Formula: Wavelenght (lamda)= speed of light, 3 X 10^8(c)/frequency, 5.1 X 10^14. My answer was 5.9 X 10^-5. Is this anywhere near correct? Please explain the steps if I&#...
*December 6, 2008*

**appeal letter**

I have received a exclusion from uni, because I fail 3 courses this semester.So school ask me to write an appeal letter in order to get a chance of re-enrollment. Please help me and give me some advices, thanks a lot!!!
*December 5, 2008*

**BUS 210**

Describe a business scenario, either real or fictional, that depicts each of the following forms of business organization: Joint-stock company, Limited liability company, Partnership, and Sole proprietorship.
*December 3, 2008*

**4th grader needs help>>>Transporation**

I was asked to interview a grandparent about what New York's public transportation was like in the past. What kinds of questions could I ask him or her?
*November 29, 2008*

**math**

i mean -5 for .5
*November 25, 2008*

**math**

why would the be a value c for 1<c<3 that the h'(c)=.5
*November 25, 2008*

**11th grade**

a particle starts at time t=0 and moves on a number line so that its position at time t is given by x(t)= (t-2)^3(t-6) what is the farthest to the left of the origin that hte particles moves?? i was able to find the velocity and acceleration formula. but i have no idea how to ...
*November 23, 2008*

**Stats: need help please**

thanks
*November 23, 2008*

**Stats: need help please**

two golfers plan to enter a tournament where the score will be determined as a team score. golfer x has a mean score of 85.4 and St. Deviation of 3.2 while golfer y has a mean score of 89.6 and St. deviation of 4.1. what is their expected team score and the variation ...
*November 23, 2008*

**Maths**

The first odd number can be expressed as 1 = 1squared - 0squared. The second odd number can be expressed as 3 = 2squared - 1squared. The third odd number can be expressed as 5 = 3squared - 2squeared. a) Express the fourth odd number in this form. (Am I right in saying 7 = ...
*November 20, 2008*

**Pre-Algebra**

Thank you again! Really appreciate it.
*November 19, 2008*

**Pre-Algebra**

2/7y = 18 (2/7y) / 2/7 = 18 / (2/7) y = 63
*November 19, 2008*

**Pre-Algebra**

does y = 63
*November 19, 2008*

**Pre-Algebra**

What is the answer to this one? 4/7y - 8 = 2/7y + 10 4/7y - 8 = 2/7y + 10 (4/7y - 8) - 2/7y = (2/7y + 10)- 2/7y 2/7y - 8 = 10 2/7y - 8 + 8 = 10 - 8 2/7y = 2 (2/7 y)/ 2/7 = 2/1 / 2/7 y = 2/14 or 1/7
*November 19, 2008*

**Pre-Algebra**

Thank You all! I was trying to help my daughter and was all confused.
*November 19, 2008*

**Pre-Algebra**

13 - t = -t + 7 (13 - t) - 13 = (-t +7) -13 -t = -t - 6 -t + t = (-t - 6) + t 0 = -6 This makes no sense to me.. What is the answer to the problem 13 - t = -t + 7
*November 19, 2008*

**psychology**

underlying causes of unipolar and bipolar disorders?
*November 15, 2008*

**it doesn't work**

28=1 is the value of x and that doesn't work
*November 12, 2008*

**please help; calc**

when you plug it in the original eqn. it doesn't work
*November 12, 2008*

**please help; calc**

original curve: 2y^3+6(x^2)y-12x^2+6y=1 dy/dx=(4x-2xy)/(x^2+y^2+1) a) write an equation of each horizontal tangent line to the curve b) the line through the origin with the slope .1 is tangent to the curve at P. Find x and y of point P.
*November 12, 2008*

**science**

it's a small amount, it doesn,t have to be very precise, just the average
*November 7, 2008*

**science**

Please help me!!! I need to create an expieriment but I need to find a way to measure the amount of co2 in an enclosed small space....is it possible? is there a way?
*November 7, 2008*

**optimal radius**

how do i find the optimal radius?
*November 4, 2008*

**Calculus-Optimal Form: need help... please**

thnx! :)
*November 4, 2008*

**Calculus-Optimal Form: need help... please**

Suppose you are designing a coffee creamer container that has a volume of 48.42 cubic inches. Use the surface area and volume of a cylinder to develope an eqn. relating radius r and surface area S. ¡Ç=pi=3.14 S=2¡Çr^2+2¡Çrh V=¡&...
*November 4, 2008*

**Calculus**

the curve: (x)(y^2)-(x^3)(y)=6 (dy/dx)=(3(x^2)y-(y^2))/(2xy-(x^3)) a) find all points on the curve whose x-coordinate is 1 and write an equation for the tangent line of each of these points b)find the x-coordinate of each point on the curve where the tangent line is vertical
*November 2, 2008*

**half-life of radioisotope**

A radioisotope has a half-life of 4 days. How much of a 20-gram sample of this radioisotope remains at the end of each time period? 1) 4 days 2) 8 days
*October 31, 2008*

**math**

a) 2/1 b) 2/1 I think this is right but you're gonna have to double check again
*October 31, 2008*

**Math**

I understand problems like this but with just a variable in the first one. Here, it has 12. This throws me off. factor 12m^2 + 25m + 12 = 0.
*October 29, 2008*

**Social Science**

What is a polygenous relationship?
*October 28, 2008*

**Genetics**

The question is as follows: The round trait is dominant over recessive wrinkled peas. A homozygous round pea mates with a homozygous wrinkled pea. The resulting F1 generation is self crossed and 900 round pea plants and 100 wrinkled plants are observed. What is the penetrance...
*October 22, 2008*

**Biology(Anatomy&Physiology)**

1)How many covalent bonds does it take to satisfy the carbon atom? 2)In the body, carbohydrates are stored in the form of: 3)Name the portion of an enzyme that attaches to the substrate. 4)The coiling of the protein chain backbone into an alpha helix is referred to as the 5)A ...
*October 15, 2008*

**Biology(Anatomy&Physiology)**

1)Which organelle makes most ATP 2)The chemical reaction that joins two amino acids is called 3)In a single molecule of water which type of bond holds the H to the O? 4)Which type of chemical bond results from the transfer of an electron from one atom to another 5)A chemical ...
*October 15, 2008*

**Biology(Anatomy&Physiology)**

1)Which group of organic molecules makes up your genetic code 2)A substance which tends to resist a change in the pH of a solution is called a 3)Which buffers is the most common in the body 4)Which of molecules is primarily made of CHON 5)Which is the building block or monomer...
*October 15, 2008*

**Anatomy**

1)Which two molecules/chemicals make up the backbone of the DNA molecule? 2)Which organelle makes most ATP? 3)AMP would have ________ phosphate(s) attached to it? 4)Which is the smallest carbohydrate 5)Which type of chemical bond involves a sharing of electrons
*October 15, 2008*

**physics**

25 & 20
*October 15, 2008*

**physics**

Two concurrent forces have a maximum resultant of 45 newtons and a minimum of 5.0 newtons. What is the magnitude of each of these forces?
*October 15, 2008*

**science**

how is rocks absolute age is determined?
*October 9, 2008*

**math**

explain how we use pi in the real world.
*October 8, 2008*

**math**

what is the true meaning and exact value of pi?
*October 8, 2008*

**physics**

ok, so you have to find the cos of x-axis: v*cos=(300m/s)cos 55 degrees, and then the sin of your y-axis: v*sin= (300m/s)sin 55 degrees. The vx (x-axis)is always constant. Then you have to use the formula: x=x(i)*t+ 1/2axt^2 to get the x- coordinate, y=y(i)*t +1/2ayt^2. That&#...
*September 30, 2008*

**Critical Thinking**

Are your answers correct?
*September 29, 2008*

**ALGEBRA -- long division**

Find each solution using long division. Show your work. Show that x + 1 is NOT a factor of... 2x^3 + x^2 - 11x - 30. Show that x - 3 IS a factor of 2x^3 - 11x^2 - 11x^2 + 12x + 9.
*September 25, 2008*

**Trinomials**

I need help with trinomials today. x^4 + 2x^2 - 24 and -x^2 - 5x + 14
*September 24, 2008*

**Chemistry**

Help! A solution is made by dissolving 33.7 g of MgCl2 in .35L of H20. What is the mass of the solvent? The density of water is 1.oo g/ml. Thanks!
*September 22, 2008*

**MATH: TRINOMIALS**

Hello. Can you explain to me how to factor the following. 30x^2 - 48x x2 + 6x + 7
*September 21, 2008*

**algebra**

Hello. Can you explain to me how to factor the following? 30x^2 - 48x 6x^2 + 7xy - 20y^2 Thank you.
*September 21, 2008*

**earth**

WHEN DID PRIMORDIAL OCEANS FORM?
*September 18, 2008*

**criminal justice**

can anyone put in lamen terms on what or how annotated bibligography?
*September 10, 2008*

**7th grade**

Help me solve this problem, I am lost here. These are integers, 15-12-8= also 4-(-7)-9= and -11-(-5)-(-6)=
*September 9, 2008*

**criminal justice**

what are two main functions of criminal law
*September 7, 2008*

**Math**

A man selling fruit has only three weights. But with them he can weigh any whole number of kilograms (from 1 kg to 13 kg) inclusive on his balance. What weights does he have? Responses math - Kalyan, Friday, September 5, 2008 at 4:38am The man had 1kg, 3kg and 9 kg weights. ...
*September 5, 2008*

**math**

How did you get this answer?
*September 5, 2008*

**math**

A man selling fruit has only three weights. But with them he can weigh any whole number of kilograms (from 1 kg to 13 kg) inclusive on his balance. What weights does he have? I can't figure this out
*September 5, 2008*

**algebra**

A man selling fruit has only three weights; but with them he can weigh any whole number of kilograms from 1 kg up to 13 kg, inclusive on his balance. What weights does he have?
*September 4, 2008*

**psychology**

Can you please tell me exactly what intrinsic means ? I am looking it up online and I still cannot understand the definition.
*August 18, 2008*

**Chemistry- HWK CHECK**

5 is B. I really find it mean that people deliberately put the wrong answers on this site. Is the pursuit of a decimal's worth of increased standing in the class distribution really worth lessening your character? Why can't we just help each other out fairly?
*August 4, 2008*

**Law and Ethics**

I am taking a course at Penn Foster and was having problems myself finding this information. It takes awhile but the AMA site really is helpful. Try looking for article E 5.07 and H 325.971. Also go to Google books and search the book Medical Ethics. It lets you preview the ...
*July 20, 2008*

**Reseach paper**

Should written policies be developed for abbreviation usage? If yes, what should the policies contain?
*July 17, 2008*

**Algebra**

what is factoral equations????
*July 10, 2008*

**science- need some help**

ms. Sue I have to do a powerpoint presentation I do not know where to start I am having a serious hard time on this 4th of July. Please help. I need some information that can help me start Power Pointpresentation that describes environmental benefits and challenges of ...
*July 4, 2008*

**humanities**

Aeneas is the main character. What book is he in? Who is the author?
*May 14, 2008*

**Math**

she had a bum steer
*May 13, 2008*

**Chemistry 1**

Does anyone know what websites are good to use for Chemical Reactions and balancing equation. I have a test tomorrow, and i need to really practice those. Thanks
*May 13, 2008*

**Algebra 2 Honors**

Right now in my class i am learning about sequences and series and im currtently suck on this problem. "A certain sequence is defined recursively by the t1=1 , t2=2, t2n=2t2n-2, t2n+1=3t2n-1. Find the first eight terms of the sequence." thanks for your help.
*May 12, 2008*

**CHemistry**

True/ False: The pH of a soln that is 0.20 M CH3COOH and 0.20 M CH3COONa should be higher than the pH of a 0.20 M CH3COOH soln Would it be true since CH3COOH and CH3COONa are both weak acids, and if you mix them together, it becomes more diluted, and hence should have a higher...
*May 5, 2008*

**social studies**

private and publis economics
*May 1, 2008*

**Algebra 2 Honors- Ellipses REAL ONE**

for my homework problem i have the equation: (x^2/16) + (y^2/1) = 1 I need to find out the center, the vertices, co- vertices and the Foci. I have trouble knowing how to find them, so if you can please explain them. Thank you.
*April 30, 2008*

**Algebra 2 Honors- Ellipses**

for my homework problem i have the equation: (x^2/16) + (y^2/4) = 1 I need to find out the center, the vertices, co- vertices and the Foci. I have trouble knowing how to find them, so if you can please explain them. Thank you.
*April 30, 2008*

**Pre Calc-decode matrix**

thanks
*April 27, 2008*

**Pre Calc-decode matrix**

help!-matrix size is 3x3 clues for the encoding matrix: 1. all entries are one digit and positive 2. a11, a12, a13 are all equal and prime, their sum is also prime 3.the sum of a11, a12, a13 is equal to a21 4. the sum of a22 and the opposite of a33 is zero. a22 is prime and ...
*April 27, 2008*

**math**

He has no property (HE HAS NO PROPER TEA!)
*April 24, 2008*

**Math**

i really have no idea!?!
*April 22, 2008*

**science**

the period when cell divide to create new cells is called?
*April 22, 2008*

**social studies**

withoutour two great political parties cutting across economic and geographic interest,democracy as we know it could never have been made to function.the author of this statement probably meant that;
*April 22, 2008*

**chemistry**

Woohoooo webworks!!
*April 7, 2008*

**Statistics**

What is a 95% confidence interval for mue, the population mean time the postal service employees have spent with the postal service? n=100 mean=7 S=2 years
*March 30, 2008*

**math-statistics**

18) Which of the following is the most significant result? A) P<.001 B) P<.005 C) P=.05 D) P>.05 Okay, I have the answer key and know the question is A, but I always thought that if the P value is greater than .05 than it IS considered significant and you can reject ...
*March 29, 2008*

**english**

I need help creating a crossword puzzle containing poetry terms. What do I do?
*March 8, 2008*

**Numerical & Proportional Reasoning**

the bloodhound has 4.0*10^9 scent receptors in its nose. a typical human has 1.2*10^7 scent receptors. how many time more scent receptors does a bloodhounds have than a human? round answer to the nearest whole number
*February 23, 2008*

**st hilda's**

where he and when he was born?
*February 3, 2008*

**Chemistry**

What is enthalpy in layman's terms?
*January 17, 2008*

**biology**

If a protein had 500 amino acids, how many nucleotides would there be?
*January 2, 2008*

**social studies**

How was the Acropolis a great environmental adaptation in Greece?
*December 12, 2007*

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