Monday

March 2, 2015

March 2, 2015

Total # Posts: 1,050

**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*

**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...
*December 4, 2007*

**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?
*December 4, 2007*

**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?
*December 4, 2007*

**social studies**

who is a natural born citizen of this country
*December 3, 2007*

**MATH**

3x-8>10
*November 29, 2007*

**Economics**

Can someone please explain to me what "endogenous" and "exogenous" conditions affect the business cycle.
*November 25, 2007*

**english**

does anyone know what the book" the fugitive" is about?
*November 21, 2007*

**chemistry**

how do I know the ion value of elements on the production side of the equation when balancing with the electron transfer method?
*November 14, 2007*

**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 ...
*November 8, 2007*

**Stats**

is the answerposted for this?
*October 31, 2007*

**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.
*October 27, 2007*

**Physics**

Find the velocity after a stroller has traveled 6.32m.
*October 24, 2007*

**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?
*October 23, 2007*

**math**

? evaluate the expression: 3 to the 3rd power-(15-8)+ 4 x 5
*October 9, 2007*

**Physics**

No the answer is 707/3.
*October 8, 2007*

**physics**

A penny is dropped from the observation deck of the Empire State building (370 m above ground). With what velocity does it strike the ground? Ignore air resistance.
*October 4, 2007*

**physics**

Glenda drops a coin from ear level down a wishing well. The coin falls a distance of 14.80 m before it strikes the water. If the speed of sound is 343 m/s, how long after Glenda releases the coin will she hear a splash?
*October 4, 2007*

**physics**

A Nile cruise ship takes 21.7 h to go upstream from Luxor to Aswan, a distance of 208 km, and 19.4 h to make the return trip downstream. Assuming the ship's speed relative to the water is the same in both cases, calculate the speed of the current in the Nile.
*October 4, 2007*

**physics**

Two cars are driving toward each other on a straight, flat Kansas road. The Jeep Wrangler is traveling at 84 km/h north and the Ford Taurus is traveling at 43 km/h south, both measured relative to the road. What is the velocity of the Jeep relative to an observer in the Ford?
*October 3, 2007*

**physics**

An airplane lands and starts down the runway at a southwest velocity of 41 m/s. What constant acceleration allows it to come to a stop in 1.3 km?
*October 3, 2007*

**math**

HELP!!! How do I solve the following: 3h + 2 for h =10
*October 1, 2007*

**Physics**

I keep getting a negative answer for this...is that ok?
*September 30, 2007*

**Physics**

Ok that makes sense. But how do I come up with the distance below the climber?
*September 30, 2007*

**Physics**

A small first aid kit is dropped by a rock climber who is descending steadily at 1.3 m/s. After 2.5 s, what is the velocity of the first-aid kit, and how far is the kit below the climber? This problem seems like it should be easy, but I'm not sure which equation to use. I...
*September 30, 2007*

**Paralegal Today**

Assume that John submits ann offer to Lisa to purchase Lisa's home for $300,000. Lisa responds to John's offer with a counteroffer: she will sell John her home for $325,000. John then offers to purchase the home for $325,000 and Lisa accepts the offer. In each of these...
*September 30, 2007*

**Paralegal today**

What might result if an insurance applicant makes false statements in an insurance application? In this situation, will the policy be enforceable? Explain.
*September 30, 2007*

**Physics**

For part a, my book says the answer is 310 m. I'm still really confused on how they got this answer.
*September 30, 2007*

**Advanced Math**

Def: An interger "m" divides an integer "n" if there is an integer "q" such that n=mq. ?Suppose a, b, and c are integers such that a divides b and b divides c. Prove that a divides c.
*September 27, 2007*

**Social Studies**

What does Independent Invention mean?
*September 26, 2007*

**Math**

9 divided by 66
*September 23, 2007*

**U.S. Government**

Sorry again, BUt i have a few more questions that I could not figure. 1. Give examples of which US culture or government has followed the classical republican model. 2. Give examples in which US culture or society has followed the natural rights model. 3. Which model is more ...
*September 12, 2007*

**Government**

In what ways were the founders influenced by the ideas of the natural rights philosophers? What proof can you show that the Founders were influenced by the natural rights philosophers?
*September 12, 2007*

**Physics - REPOST**

Sorry (impatient) and Thanks. So E=/F/ divide by /q/
*September 11, 2007*

**Physics - REPOST**

A styrofoam ball covered with a conducting paint has a mass of 5.0 x 10 ^-3 kg and has a charge of 4.0 microcoulombs. What electric field directed upward will balance the weight of the ball?
*September 11, 2007*

**Physics**

Sorry (impatient) and Thank you for your time. So is E=/F/ divide by /q/
*September 11, 2007*

**Physics - REPOST**

A styrofoam ball covered with a conducting paint has a mass of 5.0 x 10 ^-3 kg and has a charge of 4.0 microcoulombs. What electric field directed upward will balance the weight of the ball?
*September 11, 2007*

**Physics**

I would like logic on how to solve this problem. A styrofoam ball covered with a conducting paint has a mass of 5.0 x 10 ^-3 kg and has a charge of 4.0 microcoulombs. What electric field directed upward will balance the weight of the ball?
*September 11, 2007*

**math**

gordy has 187 cds.he wants to put them on shelves.each shelf holds 42 cds.how many shelves he be able to completely fill whit cds?
*September 10, 2007*

**fin**

The answer to question A. is $189,500
*September 8, 2007*

**physics**

The Space Shuttle astronauts use a massing chair to measure their mass. The chair is attached to a spring and is free to oscillate back and forth. The frequency of the oscillation is measured and that is used to calculate the total mass m attached to the spring. If the spring ...
*September 5, 2007*

**science(physics)**

can you help me??
*September 5, 2007*

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