Tuesday

February 9, 2016
Total # Posts: 3,476

**biology/honors**

Charle Darwin made theory of natural selection but couldnt explain why there is variation within populations. Explain two reasons why there is variation within population ? PLEASE help me answer this question is for my test
*May 20, 2011*

**biology/honors**

How does genetic variation lead to speciation ? Can you help me answer this question please for the review test ? thank you .
*May 19, 2011*

**biology/honors**

Can someone help answer this question please is one of my study guide for the test? What are some adaptation that hominid populations developed as opposed to primates ? thank you
*May 19, 2011*

**Math**

Which is the exact value of the expression sqrt 32- sqrt 50 + sqrt 128 2 sqrt 7 7 sqrt 2 22 sqrt 2 2 sqrt 55
*May 19, 2011*

**chemistry**

Oxygen can be produced by the thermal decomposition of mercuric oxide: 2 HgO(s) → 2 Hg(l) + O2(g) How many liters of O2 are produced at 50.0°C and 0.947 atm by decomposition of 57.0 g of HgO?
*May 18, 2011*

**science**

What is the average velocity of the argon atoms in the gas phase at 75°F?
*May 18, 2011*

**geometry**

how long are the congruent legs of isosceles triangle if its base and altitude to the base are 12cm and 8 cm respectively?
*May 17, 2011*

**geometry**

miss sue can u pls help me?
*May 17, 2011*

**geometry**

how long are the congruent legs of isosceles triangle if its base and altitude to the base are 12cm and 8 cm respectively?
*May 17, 2011*

**geometry**

A photographic negative 35mm long and 24mm wide is to be enlarge to make a picture 28.8 cm long.find the width of the picture?
*May 17, 2011*

**geometry**

the sides of a triangle is 9,12,15cm..Find the sides of a similar triangle if the longest side is 20 cm
*May 17, 2011*

**geometry**

what is the ratio of 2 segments where the length of one is 8cm while that of the other is 4ocm?
*May 17, 2011*

**geometry**

X=15 y=20
*May 17, 2011*

**geometry**

a segment of 35cm long is divided in 2 segment whose ratio is 3:4 how long is each segment?
*May 17, 2011*

**lit class**

what is the allusion in this passage my mom is a draconian monster. Amy cried in her best "victim" voice to her friend jessop. "She won't let me do anything fun. yesterday she made me study vocabulary words before I could go out with my friends. that where ...
*May 17, 2011*

**lit class**

So it would be Calvin Coolidge? I thought it was john Hancock because heserved as president of the second continental congress and he became a synonym for his signature maybe I'm getting in depth I see what you are saying it just means signature in this passage.
*May 16, 2011*

**lit class**

what is the allusion in the passage from a letter written by a world war I veteran in the mid 1920's well we are finally getting what we richly deserve. the adjusted compensation act law. Even Calvin Coolidge wouldn't put his john Hancock on the bill congress, did ...
*May 16, 2011*

**Lit Class**

so it's donnybrook because it's describes from the past
*May 16, 2011*

**Lit Class**

what is the allusion in the passage watching a debate would be boring." Kristin said. "I really don't think that's how I want to spend my Saturday morning. "Oh no Mary argued. I've heard some debated where words flew like verbal donnybrooks and were ...
*May 16, 2011*

**LIT CLASS**

what is the allusion in this passage as so we conclude that despite the plethora televisions. stereo, video games, gigantic movie theater complexes and the world wide web-- all of which bombard the populace and myriad images and numberless opportunities to communicate --the ...
*May 16, 2011*

**math**

a sphere has a volume of 500/3 £k cubic centimeters. what is the total surface area, in square centimeters, of the sphere?
*May 16, 2011*

**Pre- Algebra**

3000 2 = 6000 -2-5 you cant do that so you switch the signs so its -2+-5=-7 so its 6000 times -7 hope this helped
*May 15, 2011*

**Physics**

A small light is 13.0 cm below the surface of a liquid of refractive index 1.20. Viewed from above, the light appears to illuminate a circle on the surface of the water. What is the diameter of the circle?
*May 13, 2011*

**physics help!**

how do we find out the electron charge and mass if we dont know what type it is?
*May 12, 2011*

**help fast ,( physics) **

the distance between q3 and q2 is 48 cm and between q2 and q1 is 56 cm ?? what would the answer be now?
*May 12, 2011*

**help fast ,( physics) **

this question will help me too, if only you can give abit more detail,when it comes to answering this question... please
*May 12, 2011*

**spanish/check please**

1-Yo tengo (tantas/ tantos) praticas como mi hermano answer: tantos 2- Juan toma ( tantas/ tantos) lecciones de artes marciales como Carlos. answer:tantos 3- Elena tiene( tantas/ tantos) pasatiemptos como Angelica. answer:tantas 4_ Camilo tiene(tanto/tanta) interes en el ...
*May 10, 2011*

**Calculus**

True or false. 1. If F'(x) = G'(x) on the interval [a,b] then F(b)-F(a) = G(b)-G(a). I think it's true but I just want to check my reasoning. F'(x) = G'(x) means that F(x) and G(x) differ by a constant (which may be 0). When the subtraction is done to find ...
*May 10, 2011*

**Math**

Two fire towers are 30 kilometers apart, tower A being due west of tower B. A fire is spotted from the towers, and the bearings from A and B are E 14 degrees N and W 34 degrees N, respectively. Find the distance d of the fire from the line segment AB.
*May 10, 2011*

**Calculus**

integral 5e^t-(sin(t))dt I figured this out as the answer 5e^t+cos(t). My question is if I need to put a +C at the end of the equation. Thanks for your time.
*May 10, 2011*

**math**

just did this in my homework... break even quantity F/(s-c) Revenue s(f/(s-c))
*May 7, 2011*

**calculus**

What is the indefinite integral of 6/(x ln(2x)??
*May 6, 2011*

**stats**

A particular college basketball player is a 80% free throw shooter. In a game, he took 20 free throws. Find the probability he made 18 or more of his free throws.
*May 5, 2011*

**Algebra**

Thank you for your help.
*May 5, 2011*

**Algebra**

Im having a hard time figuring out this problem: Use the function, y=-(x+1)^2 +2, to answer the following parts. The increasing interval and decreasing interval To find both I believe that: increasing : x < -1 decreasing : x > 1 So is this on solution below Increasing ...
*May 5, 2011*

**physics**

If 1200 cal of heat are added to 50 g of water initially at a temperature of 15 oC, what is the final temperature of the water?
*May 4, 2011*

**account/check please**

The two accounts used to adjust the uncollectible accounts are. A) Uncollectible Accounts Expense and Allowance for Uncollectible Accounts. B) Accounts Receivable and Uncollectible Accounts Expense. C)Accounts Receivable and Allowance for Uncollectible Accounts D)Accounts ...
*May 4, 2011*

**account/check please**

The two accounts used to adjust the uncollectible accounts are. A) Uncollectible Accounts Expense and Allowance for Uncollectible Accounts. B) Accounts Receivable and Uncollectible Accounts Expense. C)Accounts Receivable and Allowance for Uncollectible Accounts D)Accounts ...
*May 4, 2011*

**algebra**

Im having a hard time figuring out this problem: Use the function, y=-(x+1)^2 +2, to answer the following parts. Find the y-intercept y=-(0+1)^2 +2 y=-(1)^2 +2 y=-1+2 y=1 is my answer Find the x-intercept 0=-(x+1)^2 +2 0=-((x^2)+(1^2))+2 0=-x^2 - 1 + 2 sq.rt(x^2)= sq.rt(1) x=1...
*May 4, 2011*

**Special Education**

ok forgot that part.... i think I got it,.... thanks for your help
*May 4, 2011*

**Special Education**

Given at least 3 blocks of contrasting colors from the table and guiding 1 hand to hold the block, Shimon will be able to pick up the the block with one hand, 4/5 trials.at about. WHat about the above? Wow this is confusing....
*May 4, 2011*

**Special Education**

Yes so I think the part where Shimon is picking up th biggest block with one hand should be corrected.... do u have any idea how I could possibly change that..
*May 4, 2011*

**Special Education**

Given at least 3 blocks of contrasting colors from the table and guiding 1 hand to hold the block and the other to pick up the block, Shimon will be able to pick up the biggest block with one hand, 4/5 trials. There is something wrong with the above behavioral objective. Do ...
*May 4, 2011*

**accounting**

The two accounts used to adjust the uncollectible accounts are. A) Uncollectible Accounts Expense and Allowance for Uncollectible Accounts. B) Accounts Receivable and Uncollectible Accounts Expense. C)Accounts Receivable and Allowance for Uncollectible Accounts D)Accounts ...
*May 4, 2011*

**Algebra**

Is the vertex (-1,2) Increasing interval (-2,1) Decreasing interval(1,-2) Do the x-intercept =1?
*May 4, 2011*

**Algebra**

Im having a hard time figuring out this problem: Use the function, y=-(x+1)^2 +2, to answer the following parts. Find the y-intercept y=-(0+1)^2 +2 y=-(1)^2 +2 y=-1+2 y=1 is my answer Find the x-intercept 0=-(x+1)^2 +2 0=-((x^2)+(1^2))+2 0=-x^2 - 1 + 2 sq.rt(x^2)= sq.rt(1) x=1...
*May 4, 2011*

**accounting/help please**

The two accounts used to adjust the uncollectible accounts are. A) Uncollectible Accounts Expense and Allowance for Uncollectible Accounts. B) Accounts Receivable and Uncollectible Accounts Expense. C)Accounts Receivable and Allowance for Uncollectible Accounts . D)Accounts ...
*May 3, 2011*

**English I**

Is this a persuasive topic for an essay: Does television today brainwash children and teens? Yes or No? How? My english teacher says he gets it but it needs to be more persuasive and specific. How do I that? Can you give me some examples? Please and thank you.
*May 3, 2011*

**calculus**

The graph of f'(x) is shown for 0=< x =<10. The areas of the regions between the graph of f' and the x-axis are 20, 6, and 4, respectively. I'm going to describe the graph of f' since I can't post pictures. The first section of the graph goes up (like...
*May 2, 2011*

**physics**

a particle drops from the height 500m with the initial velocity at rest, and it goes into the water. a particle has a mass of 1kg. draw graphs a-t, v-t, and s-t until 10 second after it hits the water. consider the air and water resistance is measured as F air=.005v^2 N and F ...
*May 2, 2011*

**math**

Select a variable (mean or proportion) to determine if there is a difference in the two groups. Samples must be independent. Select a sample of data values (20 to 50) for each group. Then address the following (and a little more) in your project. a. Write a brief statement of ...
*April 30, 2011*

**geometry/help**

Find the area of a regular heptagon with the side 7 cm. answer 178.1 cm² can you check
*April 27, 2011*

**Calculus 2**

Write in cartesian form: r=3tan(theta)sec(theta) im working with this function here, trying to get an rcos(theta) and/or rsin(theta) so far, i am stumped. what i have so far: r^2=3r(tan(theta)sec(theta)) (x^2+y^2)=?????
*April 27, 2011*

**english/help please**

I have a project in Brave new world. I have to make a flag that represent the society .Can you give ideas or symbols to represent the different aspects of their society and what color to use too. please and thank you very much.
*April 27, 2011*

**French**

avec sa soeur et ses parents
*April 27, 2011*

**algebra**

SUBSTITUTE THE VALUE IN THE PARENTHESES FOR X - 3 TIMES FOR 5, 50 AND 120
*April 26, 2011*

**chemistry**

calculate the percent composition of the compound that forms when 222.6 g nitrogen combines completely with 77.4g oxygen.
*April 26, 2011*

**Physics**

A student standing on the ground throws a ball straight up. The ball leaves the student's hand with a speed of 13m/s when the hand is 2.3m above the ground, how long does it stay in the air?
*April 26, 2011*

**Algebra 2**

If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to x from the first equation is substituted into the second equation. x – 2y = 2 x + 3y = 17
*April 25, 2011*

**calculus**

can not figure out problem. (the area of the region in the first quadrant between the graph of y=x sqrt (4-x^2) and the axis is ? a(2/3)sqrt2 b 8/3 c 2sqrt2 d 2sqrt3 e 16/3
*April 21, 2011*

**chem**

A 75.0 mL volume of 0.200 M NH3 (Kb=1.8x10^-5) is titrated with 0.500 M HNO3. Calculate the pH after the addition of 28.0 mL of HNO3.
*April 20, 2011*

**chem**

A 75.0 mL volume of 0.200 M NH3 (Kb=1.8x10^-5) is titrated with 0.500 M HNO3. Calculate the pH after the addition of 28.0 mL of HNO3.
*April 20, 2011*

**Economics**

In long-run equilibrium there will be no economic profit in a purely competitive static economy because: 1- barriers to entry will prevent profit from arising. 2-there will be no uncertainty, no innovations, and no monopoly. 3- there will be no need for professional managers ...
*April 19, 2011*

**Economics**

how did u find it
*April 19, 2011*

**Economics**

thanks
*April 19, 2011*

**Economics**

Suppose you deposit $5,000 in a bank which pays 10 percent interest compounded twice a year. The actual annual interest rate you receive is: a- 10 b-11 c-10.25 d-12
*April 19, 2011*

**Math**

People make mistakes. Calm down. A=P(1+r)^t A= interest P= principle interest r= interest rate t= time in years If $4500 invested at 7% interest compounded annually yeilds $15600, for how many years was the money invested?
*April 19, 2011*

**Math**

A=P(1+r)^2 A= interest P= principle interest r= interest rate t= time in years If $4500 invested at 7% interest compounded annually yeilds $15600, for how many years was the money invested?
*April 19, 2011*

**Math**

if u can give me an example if i select on how many people did not have college degree
*April 18, 2011*

**Math**

Select a variable (mean or proportion) of interest to you and collect or find the data. BEFORE you collect the data, decide what a likely mean or proportion might be. Then address the following (and a little more) in your project. a. Write a brief statement of the purpose of ...
*April 18, 2011*

**Chemistry**

The lethal inhalation dose of sarin for a 200lb person has been determined to be 0.0015 mg. Determine the LD50 of sarin that researchers used to calculate this lethal inhalation dose.
*April 18, 2011*

**differential equations**

Search: A 8 kg mass is attached to a spring hanging from the ceiling and allowed to come to rest. assume that the spring constant is 40 n/ m and a damping constant is 3 N/m. At t=0 and external force of 2 sin(2t+PI/4)N is applied to the system. determine amp, frequency and ...
*April 18, 2011*

**Health**

I still dont know what it is. One the sites. It just says Anabolic Steroids but isnt there a catagory its under?
*April 16, 2011*

**Health**

What is the Drug Classification of Anabolic Steroids?
*April 16, 2011*

**MATH**

Additional help throughout the 36 weeks.Thanks!
*April 15, 2011*

**MATH**

A Science instrutor assigns his student one second of home work..the first week of school,two seconds. the second week four seconds, the third.if the student asked whether he would agree to this weekly homework doubling for the duration of the 36-week school year.how much ...
*April 15, 2011*

**MATH**

A Science instrutor assigns his student one second of home work..the first week of school,two seconds. the second week four seconds, the third.if the student asked whether he would agree to this weekly homework doubling for the duration of the 36-week school year.how much ...
*April 15, 2011*

**math**

Gene has less 12 nickels,dimes,&quarters in his pocket.The probabilty of pulling out a nickel or quarter is 3/4.pulling out a dime is 1/4.How many coins does gene have in his pocket?.how many of each coin does he have?Please explain how you got the answerit will help me alot ...
*April 14, 2011*

**Math**

you deposit $1000 at 3% per year.what is the balance at the end of one year,and what is the annual yield,if the interest.Please help solve the problem. Simple interest? Compounded annually? Compounded quarterly Compounded daily
*April 14, 2011*

**Math**

Please help solve the below question.I made a mistake on my first post.Show work please! On Dec 28,2007,you could buy a 10-year U.S.Treasury note(a kind of bond)for $10,000 that pays 4.21% simple interet every year through Dec 28,2017.How much total interest would it earn by ...
*April 14, 2011*

**Math**

Thank you very much for your help!
*April 14, 2011*

**Math**

This one is qt different..i need more help..Thanks!
*April 14, 2011*

**Math**

you deposit $1000 at 3% per year.what is the balance at the end of one year,and what is the annual yield,if the interest.Please help solve the problem. Simple interest? Compounded annually? Compounded quarterly Compounded daily
*April 14, 2011*

**chemistry**

How much Fe3O4 is produced when 50g of Fe is reacted with exess water vapor
*April 13, 2011*

**An Overview of Teaching Techniques**

I'm having trouble with this one. What type of teaching uses formal lectures? Student-centered Teacher-redirecting Teacher-centered Outdated styles. I'm thinking Teacher-centered I'm I right.
*April 12, 2011*

**maths**

Are you sure you typed this correctly? It doesn't make sense for them to give you the diameter and ask about the level falling. Should 140 cm be the height?
*April 12, 2011*

**algebra**

Height is related to the two bases and area A=.5h(b1 + b2) so A /(b1 + b2) = .5h so 2A/(b1 + b2) = h
*April 11, 2011*

**math**

Length = 2 widths + 6 24 = 2w + 6 18 = 2w 9 = w
*April 11, 2011*

**math**

15/x = 3/2 therefore 2 times 15 = 3 times x 30 = 3x 10 = x 24/x = 3/2 therefore 2 times 24 = 3 times x 48 = 3x 16 = x 27/x = 3/2 same as above x = 18 the other sides are 10, 16, and 18
*April 11, 2011*

**Chemistry**

Thank you so much! I am still very shaky on this, but I understand a lot better!
*April 11, 2011*

**Chemistry**

If a researcher needs 0.50 L of 3.0 M nitrite buffer at pH 3.00, then she knows that the concentration of nitrous acid (conjugate acid) plus the concentration of nitrite anion (conjugate base) must equal 3.0 M. She must then calculate the amount of each that is necessary to ...
*April 11, 2011*

**math**

x is what he earned on Saturday 2x is what he earned on Sunday x/2 is what he earned on Friday x + 2x + x/2 = 70 3.5 x = 70 x=70/3.5 x = 20 $20 on Saturday $40 on Sunday $10 on Friday
*April 11, 2011*

**Calculus**

π∫(e^x)^2 dx evaluated from -1 to 1 this is the disk method and u substitution(u = 2x) =.5π∫e^u du =.5πe^2x evaluated at 1 and -1 =.5(e^2-e^-2)π =3.626π cubic units about 11.39 cubic units
*April 11, 2011*

**Chemistry**

Given that the Ka of benzoic acid is 6.50 x 10-5, how would one prepare 0.500 L of a benzoic acid/sodium benzoate buffer of a desired pH of 4.00? The starting concentration of the benzoic acid is 3.00 M and the molecular weight of sodium benzoate is 144.10 g/mol
*April 10, 2011*

**physics**

Two 5.0 g spheres are suspended from a long thread and seperated by a distance of 140mm. The spheres repel after being charged to +86nC. Find the angle
*April 10, 2011*

**physics - URGENT**

Two blocks are connected by a heavy uniform rope with a mass of 4.00 . The topblock is 6.00kg, the bottom block is 5.00kg with an applied upwardforce of 200 N. What is the tension at the midpoint of the rope?
*April 10, 2011*

**Chemistry**

Given that the Ka of benzoic acid is 6.50 x 10-5, how would one prepare 0.500 L of a benzoic acid/sodium benzoate buffer of a desired pH of 4.00? The starting concentration of the benzoic acid is 3.00 M and the molecular weight of sodium benzoate is 144.10 g/mol
*April 10, 2011*

**math**

The top speed of a cheetah is 71 miles per hour. Which of the following answers seems most reasonable for the distance a cheetah would cover in 25 minutes at this speed?
*April 10, 2011*

**English**

I need you to check these sentences for me on Prospero and Caliban. I'm not sure about the tense choice (can you say that)? 1) Caliban hopes that they both Prospero and Miranda get drenched with a dew as evil as the kind his mother used to collect with a raven’s ...
*April 10, 2011*

**English**

I just hav a sentence. Thank you He had been married for two years when his wife decided to apply for a divorce (filed for divorce)/decided to break up their relationship. How can you express this?
*April 9, 2011*