# Posts by Lauren

Total # Posts: 1,848

**physics**

if a block of wood dropped from a building has attained a velocity of 78 m/s how long has it been falling?

**math**

how do you find domain and range for the problem f(x)=x cubed

**college math**

sam bought 1 of 250 tickets for $2 in a raffle with the prize of $400. Was $2 fair price? Can someone show me the formula on how to get this answer. My text is super confusing.

**5th grade**

21n

**Math**

If you have 200 blocks and want to stack them in a solid shape, how many shapes can you stack them?

**Physics**

Describe alpha, beta, and gamma rays. What exactly is each ray composed of? What are their characeristic radiation characteristics?

**physics**

How does the mass of a nucleon compare with the mass of an electron?

**college math**

a bag contains 7 red chips and 9 blue chips. Two chips are selected randomly from the bag without replacement. What is the probability that the two chips are the same color? If someone could just point me in the right direction for the many equations I could use I would be ...

**math**

Babe Ruth's lifetime betting averge was .343. In three times at bat, what is the prbability of the following? a. he gets three hits b. he gets no hits c. he gets at least one hit. d. he gets exactly one hit

**college math**

a pair of dice are rolled and the sum is recorded. What is the probability that the sum shown is 8 given that one die is showing 5? Is this done correctly? P(8|5)=1/6 x 1/6= 1/36 I really just want to make sure I have done this the right way!

**college math**

Can someone just tell me the formula to use for this problem? Jack is taking a four item true/false test. He decides to flip a coin to answer. What is the probablility he gets a perfect score? What is the probablility on a 10 question test?

**math**

So I just multiply the probability of each ball on each turn? Thank you sooo much! Why can't the text just say that?

**math**

I have a question in my math class in college. Here is the question, but I just need help on HOW to answer it. My text isn't clear at all. A box contains 2 black balls and 3 gold balls. 2 balls are randomly drawn in succession. a.if there is no replacement, what is the ...

**Physics**

Describe the Bohr model of the atom. What is de Broglie's key idea (involving matter waves) that makes the Bohr atom have discrete energy levels?

**Physics**

The higher the energy level occupied by an electron in the hydrogen atom, the larger the atom. The diameter of the atom is proportional to n^2, where n=1 labels the lowest or "ground" state, n=3 is the thrid state, and so on. If the atom's diameter is 1 x 10^(-10...

**math**

Henry's z-score on his reading test was 1.27. The class average was 60, the median was 58.5 and the variance was 6.2. What was Henry's "raw" score (his score before converting to z-scores)

**Algebra 2**

what is the answer to: -6psquared+11p+7=0 i'm confused...

**Physics**

How does the idea of magnetic fields arising from circulating currents relate to permanent magnets?

**Physics**

An ideal transformer has 50 turns in its primary and 250 turns in its secondary. 12 V ac is connected to the primary. Find: Power suppled to the secondary?

**Physics**

20=240/N Is the answer 480=N

**Physics**

A model electric train requires 6 V to operate. If the primary coil of its transformer has 240 windings, how many windings should the secondary have if the primary is connected to a 120 V household circuit?

**physics**

How can you easily increase the magnetic field strength inside a current-carrying coil?

**art**

during what years did boticelli visit rome

**writing ASAP-.**

i'm work on a book project on ameila earhart.The queston on my book report is ...How is the provied by the author imporant or relatable to today's modern society ?Please tell what this means and give an example.

**Physics**

How do you divide 4.0 V by .041 A? Would the answer be: 97.6

**Physics**

Is the answer 30?

**Physics**

The voltage across a 10-ohm resistor carrying 3 amps must be?

**Statistics**

pls help

**National and State Government**

How did the Civil Rights Division of the Department of Justice operate during the George W. Bush administration?

**History**

Which political faction would Obama have fallen under: Federalist or Jeffersonian?

**Physics**

Is the answer F subscript elec F subscript grav = (8.22 x 10 subscript -8) (3.63 x 10 subscript -47) = 2.26 x 10 subscript 39

**Physics**

How do you calculate and compare the gravitational and electrical forces between an electron and a proton separated by 10 to the negative 10 m. Is the answer: m x a = (4p2r/t2)= 10 - 30 x 4 x1021= 4x10

**9th grade(math)**

the product is two times m

**Trig**

Oh, so basically.. I would subtract 2pi, which gives me 11pi/6. The cos of 11pi/6 is sqrt(3)/2. Since the sec is 1/cos(23pi/6), it would also be 1/(sqrt(3)/2)? Simplified, that gives me a final answer of 2sqrt(2)/3, which is the answer I was looking for. Thank you for your ...

**Trig**

Find the exact circular function value for: sec(23pi/6) I know the answer should be: [2sqrt(3)]/3, but I do not understand how to solve the problem. I have a unit circle, but 23pi/6 is not on it, so I don't know how to find the (x,y)

**home economics**

HBV protein is a type of protein that comes from animals like the protein in liver or beef and it contains all the essential amino acids and in the correct proportions. LBV is protein from vegetable products like lettuce.

**Math**

greater than 30 but less 40 and if you add the digits you get a sum of 10. What is the number word? greater than 7/10 tens but less than 8/10 tens the number has 4 ones, what is the number word? I have more but will wait for these first, thanks. This is to try and help my ...

**algebra**

what is 1.59x+4.23=3.56x+2.12

**chemistry**

I still do not understand how to figure out this problem yet? 6FeO3----->4Fe304+02 DELTA H=+ 392kj If 2.83 g of Fe2O3 decomposed according to the above reaction , how many kj of heat would be exchanged with the enviroment? chem - DrBob222, Thursday, October 15, 2009 at 11:...

**chem**

6FeO3----->4Fe304+02 DELTA H=+ 392kj If 2.83 g of Fe2O3 decomposed according to the above reaction , how many kj of heat would be exchanged with the enviroment?

**4th grade**

if a=11 b=2 c=18 then what does a+c-b=?

**Calculus**

wow im sorry, this was a lot easier than i thought

**Calculus**

y = ln(3x+5), then d^2y/dx^2 = a. 3/(3x+5) b. 3/((3x+5)^2) c. 9/((3x+5)^2) d. -9/((3x+5)^2) e. -3/((3x+5)^2)

**Calculus**

f(x) = sq.root(e^2x+1), then f'(0)= a. -sq.root(2)/2 b. sq.root(2)/4 c. sq.root(2)/2 d. 1 e. sq.root(2)

**Math**

Pages are 30 and 31 30x31=930

**AP Physics Halley's Comet**

Halley's expected return....

**AP Physics Halley's Comet**

Yes, it is still in the solar system. Halley is one of those comets with orbits in the planetary system. It's periodic returns demonstrates that is was in orbit around the sun and that some comets are members of the solar system. Halley's expected reurn to the inner ...

**math**

You must earn $115 $292 +193 + 115=600 $600 divided by 3= 200

**math**

5 out of 26 for drawing a vowel

**math**

It is 126 Least common multiple is the lowest number that can be divided by any two or more numbers evenly

**algebra 1**

Rewrite expresson using only postive exponents 2ab^3c-^3

**french help please=)**

To Mk- he was my one and only dog and he was small and weak

**french help please=)**

urg. i don't understand why my accents are not working=/

**french help please=)**

Hmm.. okay. I had to use another laptop hopefully this will work. J'adore les animaux, surtout les chiens. Il y a deux ans quand j'ai rencontré mon premier and seulement chien. Il a été petit et faible. Il a un gros nezmais les fourrure bruns et ...

**french help please=)**

Can someone see if I wrote this correctly? J’adore les animaux, surtout les chiens. Il y a deux ans, quand j'ai rencontré mon premier et seulement chien. Il a été très petit et faible. Il a un gros nez mais les très petits yeux noirs...

**math**

6 X 2= 12. 2/6=1/3.

**math**

how do I do 84m 15cm to centimeters?

**Science!**

CuCO3 + O2 -> CuO + CO2 hydrogen peroxide + manganese dioxide -> hydrogen + oxygen copper (II) sulfate pentahydrate + oxygen -> copper oxide + sulfur trioxide + dihydrogen monoxide What are the balanced queations for these?

**math**

what is 38.29 seconds in decimal form?

**Chemistry**

iaj;ldsk

**Science -- same q, dont reply if you dont know!**

Thank you so much! I appreciate it :)

**Science -- same q, dont reply if you dont know!**

Alright, so I'm doing a lab report, and I have this word equation: iron (III) nitrate + sodium hydroxide --> iron (III) hydroxide + sodium nitrate I would like to turn this into a balanced equation, and I have: Fe(NO3)3(l) + 3NaOH(l) --> Fe(OH)3(s) +3NaNO3(l) (the ...

**Science**

Alright, so I'm doing a lab report, and I have this word equation: iron (III) nitrate + sodium hydroxide --> iron (III) hydroxide + sodium nitrate I would like to turn this into a balanced equation, and I have: Fe(NO3)3(l) + 3NaOH(l) --> Fe(OH)3(s) +3NaNO3(l) (the ...

**physics**

greg

**Calculus**

solve: 14. ln(1/x) = -2 16. lnx + ln(x+2) = ln(x+6) 22. ln(lnx) = 1

**9th grade, SOSE**

Was world war two hitlers war?? if so why.

**Calculus**

a particle starts at time t = 0 and moves along the x axis so that its position at any time t>= 0 is given by x(t) = ((t-1)^3)(2t-3) a.find the velocity of the particle at any time t>= 0 b. for what values of t is the velocity of the particle negative? c. find the value ...

**math**

Find the representation of the number 256 in the following bases: a. base six b. base twelve c. base two I get how to write the number of objects as a base(whatever), but I think this is asking me to start from the end number and work backwards. I really need help. I have two ...

**world history**

Source-(The event which finally triggered war came on 28th June in Sarajevo, a town in the Austro-Hungarian Provence of Bosnia) How important was the assassinations of the Archduke Franz Ferdinand and his wife in causing the First World War? (5 marks)

**Math**

What do they call the international hula hoop championships?

**Math**

What do they call the international hula hoop championships?

**French part 3**

Could you please check these thanks Directions: Indicate whether each of the following statments is true or false. 1. Il faut passer par le controle de sécurité avant le vol. Answer: vrai 2. On peut laisser ses bagages à main dans le couloir pendant le vol...

**French part 2**

Could you check these please thanks Directions: Choose the correct verb to complete each phrase. Here are the verbs you can choose: passer, enregistrer, sortir, remplir, servir, choisir, and attacher. 1. -------- une place coté couloir. Answer: Choisir 2. ------- par le...

**French**

could you please check these thanks. Directions: Indicate whether each of the following statements are true or false. 1. Avant de monter en avion, on passer par le controle de sécurité. Answer: Vrai 2. On sert un repas pendant un vol transatlantique. Answer: Faux...

**quick science question**

What are some ways in which genetics collect samples to test for disorders?

**Geography**

Five Geographic Themes: What is the place of Moscow, Russia?

**math!**

hi im lauren and i have a big math test tomorrow(7th grade) and i need 2 know wht interval means. And i need the expalnation 2 be so simple that a little kid can understand it. lol. Can someone answer like in the next 10 mins plz! thx!! hurry peeps!!lol

**english**

Which of the following statements BEST explains why "I Am Offering This Poem" is considered a lyric poem? A. It is a simple poem that tells a story. B. It is a tragic poem that teaches a lesson. C. It is a short poem that expresses strong emotion. D. It is a rhyming ...

**healthcare reimbursement methologies from Penn Fos**

Does anyone have the answers to exam #40974000?

**Health**

How are hospitals that are excluded from the Medicare acute care PPS paid? Are they based on reasonable costs, fee schedules, global payments, or bundled payments?

**Health**

Who is responsible for paying $250 major medical insurance before a company assumes liability?

**Music**

What 18th century composer wrote music primarily for the harp?

**history**

The major conflict(s) that the christian world had with the muslims during the middle ages was/were due to: A:the desire to spread the principiles of the koran B:the desire to form a government, ecenomic, and social system C: religious inspiration to wage war and acquire new ...

**geometry**

A regular polygon has 12 sides. What is the measure of each EXTERIOR angle?

**algebra**

-2 x 7 = -3 + t + 24 solution?

**physics**

The answer should be positive, so 13.82 is correct

**Science**

How is nuclear radiation produced? What are 3 types of radioactive decay and how do they work? Thanks!

**Earth science**

How long an exposure would a photographer need to photograph star trails that are complete circles? Why? The star Sirius is 4.3 light years from Earth. Determine the distance to Sirius in km and in astronomical units. THe moon's average distance from Earth is about 380,000...

**Earth Science**

Using Kepler's equal area law, explain why the speed of an object in a perfectly circular orbit is constant. HELP!!!!!!!!!!!!!!

**Calculus**

Never mind, I figured it out-- he rationalized the denominator.

**Calculus**

This is a problem we did previously on a test; my answer was marked correct, but I am having trouble getting my answer in the same form that my teacher gave it. The question: Find the derivative of (x/(x+1))^1/2 His answer: ( (x(x+1))^(1/2) ) / (2x(x+1)^2) My answer: ((x+1)^(1...

**Calculus**

Show that the function f(x)= x^(3) +3/(x^2) +2 has exactly one zero on the interval (-infinity, 0). So far this is what I have: 0=x^3 + 3/(x^2) +2 -2= (1/x^2)(x^5 + 3) -2x^2= x^5 +3 But now I'm stuck. I also am not sure if this is how I'm supposed to be solving the ...

**Calculus**

Thank you! That makes more sense... because you would say f' of g of x.... so 1/3 of 2 = 2/3. That makes sense!

**Calculus**

I finished this problem but I wanted some feedback because I don't know if it's entirely correct. Suppose that functions f and g and their derivatives with respect to x have the following values at x=2. f(x)=8 g(x)=2 f'(x)=1/3 g'(x)=-3 Find d/dx of f(g(x)) at x...

**Calculus**

I have a two part question that pertains to a curve (r(x)) and its tangent line at x=3. We are given that at x=3, r(x)=8. In order to find the slope of the tangent line, we are given another point (on the tangent line): (3.2, 8.5). Therefore the slope of the tangent line at x=...

**CHEM..URGENT!**

At the anode, the oxidation of bromide ions (1.07 ) occurs because it has a higher (less negative) potential than the oxidation of water (1.23 ) or fluoride ions (2.87 ). The product of the oxidation of bromide ions is liquid bromine. At the cathode, the reduction of silver ...

**Statistics**

Ummm, guiding our thinking doesn't work. I'm student teaching right now and I've been a student for year, sometimes you have to give the student the answer in order for them to figure out for themselves WHY it is right.

**Physics**

A child twirling a 0.0120kg ball on a string in a horizontal circle parallel to the floor. The radius of this circle is 0.358m. The ball traveling once around the circle is 2.08 seconds. a)Determine the centripetal force acting on the ball. b) If the speed is doubled, does ...

**Chemistry**

Which liquid is more viscous at room temperature water or molasses? explain

**US HISTORY.**

Why did farmers express discontent during 1870-1900 and what impact did their new attitudes and actions have on national politics?