Thursday
April 24, 2014

Posts by Stephanie


Total # Posts: 977

Chemistry
Thank you. I rechecked my problem. Should the power be positive? Or is it another power instead?

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&#...

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!!!

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.

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?

math
i mean -5 for .5

math
why would the be a value c for 1<c<3 that the h'(c)=.5

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 ...

Stats: need help please
thanks

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 associate...

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 = 4squ...

Pre-Algebra
Thank you again! Really appreciate it.

Pre-Algebra
2/7y = 18 (2/7y) / 2/7 = 18 / (2/7) y = 63

Pre-Algebra
does y = 63

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

Pre-Algebra
Thank You all! I was trying to help my daughter and was all confused.

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

psychology
underlying causes of unipolar and bipolar disorders?

it doesn't work
28=1 is the value of x and that doesn't work

please help; calc
when you plug it in the original eqn. it doesn't work

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.

science
it's a small amount, it doesn,t have to be very precise, just the average

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?

optimal radius
how do i find the optimal radius?

Calculus-Optimal Form: need help... please
thnx! :)

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=¡&Cced...

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

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

math
a) 2/1 b) 2/1 I think this is right but you're gonna have to double check again

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.

Social Science
What is a polygenous relationship?

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...

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 ...

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 r...

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...

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

physics
25 & 20

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?

science
how is rocks absolute age is determined?

math
explain how we use pi in the real world.

math
what is the true meaning and exact value of pi?

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&#...

Critical Thinking
Are your answers correct?

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.

Trinomials
I need help with trinomials today. x^4 + 2x^2 - 24 and -x^2 - 5x + 14

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!

MATH: TRINOMIALS
Hello. Can you explain to me how to factor the following. 30x^2 - 48x x2 + 6x + 7

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

earth
WHEN DID PRIMORDIAL OCEANS FORM?

criminal justice
can anyone put in lamen terms on what or how annotated bibligography?

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)=

criminal justice
what are two main functions of criminal law

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. Ho...

math
How did you get this answer?

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

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?

psychology
Can you please tell me exactly what intrinsic means ? I am looking it up online and I still cannot understand the definition.

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?

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 bo...

Reseach paper
Should written policies be developed for abbreviation usage? If yes, what should the policies contain?

Algebra
what is factoral equations????

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 urbaniza...

humanities
Aeneas is the main character. What book is he in? Who is the author?

Math
she had a bum steer

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

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.

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...

social studies
private and publis economics

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.

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.

Pre Calc-decode matrix
thanks

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 le...

math
He has no property (HE HAS NO PROPER TEA!)

Math
i really have no idea!?!

science
the period when cell divide to create new cells is called?

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;

chemistry
Woohoooo webworks!!

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

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 y...

english
I need help creating a crossword puzzle containing poetry terms. What do I do?

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

st hilda's
where he and when he was born?

Chemistry
What is enthalpy in layman's terms?

biology
If a protein had 500 amino acids, how many nucleotides would there be?

social studies
How was the Acropolis a great environmental adaptation in Greece?

physics
A diver can change his rotational inertia by drawing his arms and legs close to his body in the tuck position. After he leaves the diving board (with some unknown angular velocity), he pulls himself into a ball as closely as possible and makes 2.16 complete rotations in 1.31 s...

physics
A figure skater is spinning at a rate of 1.7 rev/s with her arms outstretched. She then draws her arms in to her chest, reducing her rotational inertia to 62% of its original value. What is her new rate of rotation?

physics
A uniform disk with a mass of 800 g and radius 17.0 cm is rotating on frictionless bearings with an rotational speed of 18.0 Hz when Jill drops a 130 g clod of clay on a point 7.10 cm from the center of the disk, where it sticks. What is the new rotational speed of the disk?

social studies
who is a natural born citizen of this country

MATH
3x-8>10

Economics
Can someone please explain to me what "endogenous" and "exogenous" conditions affect the business cycle.

english
does anyone know what the book" the fugitive" is about?

chemistry
how do I know the ion value of elements on the production side of the equation when balancing with the electron transfer method?

Social Studies
I am doing a crossword puzzle. One of the questions was "The electoral college was developed because some of the founding fathers believed that too much democracy was a very ____thing. The answer is 9 letters long, and it has me completely stumped. Any idea where I could ...

Stats
is the answerposted for this?

Psychology
I don't believe the people on this site EVER help anyone. Everytime people ask questions, especially in the homework help, there's never really any help. just remarks like that.

Physics
Find the velocity after a stroller has traveled 6.32m.

math
begin with an 8 1/2 x 11 piece of paper. fold it 9accordion style to represent eighths and shad 5 of the 8 equal parts. Then fold and shade the paper to represent 1/3 of the 5/8. What is the multiplication problem being modeled? What is the solution?

math
? evaluate the expression: 3 to the 3rd power-(15-8)+ 4 x 5

Physics
No the answer is 707/3.

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