Tuesday

February 28, 2017
Total # Posts: 678

**Statistics**

The Internal Revenue Service is studying contributions to charity. The mean calculated from a random sample of 36 returns is $150. Assume that the population standard deviation is known and equal to $20. Construct a 98 percent confidence interval for the population mean.

*October 29, 2009*

**Physics**

What are two quantities of an object launched parallel to the ground which are equal to zero? I think one of the two is vertical velocity.

*October 26, 2009*

**math**

-8,000,000,000+999,999,999

*October 22, 2009*

**Physics - URGENT**

A boat travels at 3.8 m/s and heads straight across a river 240m wide at an angle of 145'. The river flows at 1.6 m/s. a. What is the boat's resultant speed with respect to the river bank? b. How long does ti take the boat to cross the river? c. How far downstream or ...

*October 19, 2009*

**Physics**

A boat travels at 3.8 m/s and heads straight across a river 240m wide at an angle of 145'. The river flows at 1.6 m/s. a. What is the boat's resultant speed with respect to the river bank? b. How long does ti take the boat to cross the river? c. How far downstream or ...

*October 19, 2009*

**Physics**

A boat travels at 3.8 m/s and heads straight across a river 240m wide at an angle of 145'. The river flows at 1.6 m/s. a. What is the boat's resultant speed with respect to the river bank? b. How long does ti take the boat to cross the river? c. How far downstream or ...

*October 18, 2009*

**physics - need help right now.**

A boat travels at 3.8 m/s and heads straight across a river 240m wide at an angle of 145'. The river flows at 1.6 m/s. a. What is the boat's resultant speed with respect to the river bank? b. How long does ti take the boat to cross the river? c. How far downstream or ...

*October 18, 2009*

**Physics**

A boat travels at 3.8 m/s and heads straight across a river 240m wide at an angle of 145'. The river flows at 1.6 m/s. a. What is the boat's resultant speed with respect to the river bank? b. How long does ti take the boat to cross the river? c. How far downstream or ...

*October 18, 2009*

**AP Physics - Work and Energy**

If you use the kinematic equation Vf^2=VoSin 45 + 2gd the answer would differ from one of the conservation of energy equation method. Vo=185m/s and vf=0 at max height Why is this?

*October 15, 2009*

**physics**

The correct solution is this: 3.5/4.9 = some answer s^2 then remember someanswer s^2 = t^2 so solve for t to get .845 seconds for time in air.

*October 11, 2009*

**physics**

Yea the solution provided is incorrect.

*October 11, 2009*

**Algebra**

Can you please give an example step by step of how to solve a system of linear equations in three variables?

*October 8, 2009*

**earth science**

soil maps are used to do what

*September 29, 2009*

**auto repair technician**

I do not want the questions I was looking for a study partner. And yes we are allowed to have a study partner look at the rules.

*September 28, 2009*

**science**

The living plants that are most similar to the first plants to bear gametangia are the _____. a) charophyceans b) seedless vascular plants c) angiosperms d) gymnosperms e) bryophytes

*September 22, 2009*

**Phyics**

Thank You not sure how i did catch that lol.

*September 16, 2009*

**Phyics**

A Rock Is Thrown Vertically upward with a speed of 12m/s. Exactly 1.00s later a ball is thrown up vertically along the same path with a speed of 18m/s. At what time will they strike each other? so far I got this but it does not seem to be working out for me. G=-9.80m/S^2 Y1=0+...

*September 16, 2009*

**vocabulary**

slavery in the united states

*September 8, 2009*

**social studies**

slavery in the united states

*September 8, 2009*

**6th grade**

a chocolate bar is separated into several equal pieces, if one person eats 1/4 of the piecel; and the second person eats 1/2 of the remaining pieces; there are six pieces left over. into how many pieces was the orinal bar divided?

*August 31, 2009*

**5th grade**

the two violinists played a duet. is the subject , two violinists ; is the predicate , played ?

*August 25, 2009*

**science**

stalagmites

*August 25, 2009*

**math**

Manday read that the arm of the Statue of Liberty is 42 ft long. She would like to know how long the Statue of Liberty’s nose is. How would you advise her to proceed?

*August 22, 2009*

**5th grade**

thank you mrs. sue my mom said you are awesome !

*August 20, 2009*

**5th grade**

early explorers took beads with them to americans. the complete subject is early explorers ?

*August 20, 2009*

**5th grade**

how do you separate the complete and simple subject

*August 20, 2009*

**language arts**

artists use

*August 20, 2009*

**language atrs**

whats the complete subject , artists use a needle and thread to attach beads to clothes.

*August 20, 2009*

**5th grade**

the artist

*August 20, 2009*

**5th grade**

what is the complete subject , artist use a needle and thread to attach beads to clothing.

*August 20, 2009*

**5th grade**

what is the complete subject , a person must have very good eyesight to work with beads.

*August 20, 2009*

**Social Studies**

how did sugar and slavery contribute to both the rise and fall of mercantilism?

*July 28, 2009*

**Geography**

plisss tipe in this in google jared diamonds theory

*May 19, 2009*

**Calculus**

We're doing optimization problems and this is one that I am having trouble with: Suppose a business can sell x gadgets for p=250-0.01x dollars apiece, and it costs the business c(x)= 100+25x dollars to produce x gadgets. Determine the production level and cost per gadget ...

*May 3, 2009*

**calculus**

Never mind, I figured it out; because y= csc(e^6x), the ys cancel out, so we are left with -1/6 (integral of) dy, which gives us -1/6 csc(e^6x) + C. Thank you for the help!

*May 2, 2009*

**calculus**

I know that your answer is right because it is one of the options on my homework sheet, but I don't think I quite understand how everything cancels out. If we call csc(e^6x) y from the beginning, upon initial substitution we have: (integral of) (e^6x)(y)(cot(e^6x))dx now ...

*May 2, 2009*

**calculus**

We're doing indefinite integrals using the substitution rule right now in class. The problem: (integral of) (e^6x)csc(e^6x)cot(e^6x)dx I am calling 'u' my substitution variable. I feel like I've tried every possible substitution, but I still haven't found ...

*May 2, 2009*

**Calculus**

1. Use the Taylor series to calculate the limit. Problem: limit as x approaches 0 is equal to (1-cos(x))/(1+x-e^x). I did the problem out but I need help in seeing if its correct. limit as x approaches 0 is equal to (1-cos(x))/(1+x-e^x)= (1-(1-x^2/2+x^4/4!-...))/(1+x-(1+x+x^2/...

*April 28, 2009*

**calc.**

I'm having a lot of trouble with this problem: Sketch the graph and show all local extrema and inflections. f(x)= (x^(1/3)) ((x^2)-175) I graphed the function on my graphing calculator and found the shape. I also found the first derivative: (7/3)(x^(4/3)) - (175/3)(x(-2/3...

*April 20, 2009*

**Calculus**

Does the series (1+sin(n))/(10^n) from summation 0 to positive infinity converge or diverge? I let an = (1+sin(n))/(10^n) and bn = 1/10^n lim as n approaches positive infinity = an/bn = ((1+sin(n))/(10^n))/(1/(10^n))= 1+sin(n)= positive infinity. I don't know if it's ...

*April 16, 2009*

**Math**

the answer is yes but i cantelope

*April 15, 2009*

**Calc.**

Let h(x)=16-4x-(x^3) Find g(96). My work: 96= 16-4x-(x^3) (-x^3)-4x-80=0 Using the rational roots theorm, I found that x=-4 so h(-4)=96, therefore g(96)=-4. Find g'(96). My work: g'(96)= 1/(dh/dx at x=-4) 1/((-3(-4)^2)-4)= -1/52 Does this look ok? Also, my math teacher...

*April 14, 2009*

**Calculus**

For the sequences below, find if they converge or diverge. If they converge, find the limit. an=(3^(n+2))/(5^n) an=cos(2/n) an=(2^(1+3n))^1/n I am unsure about how to get started on these problems so some assistance would be great.

*April 10, 2009*

**Physics**

thanks

*March 25, 2009*

**Physics**

Could some one tell m if this is right? 1)Does currend flow through a resistor or across a resistor in a series circuit? THROUGH 2) Is a voltage establishes through a resistor or across ? ACROSS PARALLEL CIRCUITS 1)there is a voltage drop of 6volts across each 2-Ù ...

*March 25, 2009*

**SEX EDUCATION**

NO AT ALL YOU SEXMACHINE

*March 25, 2009*

**italian**

I realy don't want this with a computer translation because it never comes out the right way could someone translate it for me? If I won 1.000.000 dollars I would go to Sardegna with all my friends for a whole year.To get their since we live in America we would take a ...

*March 23, 2009*

**Calculus**

I wanted to confirm that I solved these problems correctly (we had to convert the polar curves to Cartesian equations). 1.rcos(theta)=1 x=1 2.r=2*sin(theta)+2*cos(theta) r^2=2rsin(theta)+2rcos(theta) x^2+y^2=2y+2x (a little unsure what do next if this is correct) 3.r=tan(theta...

*March 13, 2009*

**science**

what is the resistance of a 200w bulb when supplied w/a voltage of 100v and has a current of 2.0 amps?

*March 3, 2009*

**English - Julius Caesar**

chicken nugget

*February 26, 2009*

**Social Studies**

Research and Present findings on the countries that annually perform the hajj and it must be in a five year time?

*February 18, 2009*

**Physicis**

so it would be something like this. a. tan theta=1/2(65)/750 tan theta=0.043 theta=tan-1(0.043) theta = 2.48 degree's

*February 15, 2009*

**Physicis**

Given: Two teams of children are well-matched, and they pull on the rope with exactly the same force. They have placed a 65n weight at the center of the rope. The teams first pull with 750n of force each, then in an heroic effort to straighten the rope, pull with 1500n of ...

*February 15, 2009*

**Math**

Factorise as far as possible into Prime Factors: 5x^8 - 80y^4

*February 11, 2009*

**SPANISH**

Hola Tu me gustas mucho

*February 2, 2009*

**math**

an object accelerates only if the forces acting on it in one drection are greater than the forces in the opposite direction, all of the following objects will accelerate except

*January 17, 2009*

**4th Grade Eng**

Yesterday some people were practicing musical numbers. were practicing--is that the correct helping verb for the sentence

*January 9, 2009*

**english**

were

*January 8, 2009*

**4th grade english**

were

*January 8, 2009*

**4th grade english**

Yesterday some people (was, were) practicing musical numbers.

*January 8, 2009*

**algebra**

A train left Podunk and traveled north at 75km/h. Two hours later, another train left Podunk and traveled in the same direction at 100 km/h. How many hours had the first train travelee when the second overtook it?

*January 8, 2009*

**9th grade**

It's not a buoyant girl ant

*January 7, 2009*

**social studies**

in what city was the declaration of independece approved?

*January 3, 2009*

**I know the answer**

ALINEOFCHORUSGIRLS

*December 3, 2008*

**4th grade English**

What would be the possessive form of friends in the sentence--The homework of my friends.

*November 23, 2008*

**chemistry**

I need help with this question. What should be the cell potential if the [Cu2+] is 1.0 x 10-5 mol/L? please help

*November 11, 2008*

**chemistry/please double check**

Hi, I just need to know if I finally got this exercise right. Calculate the amount of heat in kilojoules released when 50 grams of steam at 125 Celsius are converted to 50 grams of ice at -125 Celsius. so, qw= 50*4.184J/g C (125 C-o)= 26.15 x 10^3 qi= 50*2.09*(-125)=-13.065 KJ...

*October 28, 2008*

**Help with math**

Hi, adding on to Manny's response, a simplified answer would be 19/20, by diving both the numerator (95) and denominator (100) by 5. Thanks. Hope I helped.

*October 28, 2008*

**chemistry**

sorry it was a typo and yes they didn't ask for the freezing point thanks so much

*October 28, 2008*

**chemistry**

so the molecular formula will be? c= 3.30/3.29=1, H=7.75/3.29=2, O=3.29/3.29=1 2(C3H7O3)= C6H17O6 Delta T= Kf * m T= -1.86 C/m * 0.33m/g T= o.613 C am i correct?

*October 28, 2008*

**chemistry**

I need to know if I have th right molecular formula for Sorbito 39.56g C 7.75g H 52.7g O Empirical Formula is CH2O 30.026 amu how I how calculate the molecular mass and how I figure out the melecular formula? please help

*October 28, 2008*

**chemistry**

thanks

*October 27, 2008*

**chemistry**

for K3PO4 is it potassium phophate or tripotassium phosphate? or both? confuse which one we use more often?

*October 27, 2008*

**Spanish**

Gamberras? what does it mean? never heard that word before? help

*October 27, 2008*

**Spanish**

1. por sus habilidades de actuacion(put a period on top of o for actuacion. 2. y usualmente adquiere roles de muchachas de gran temperamento in peliculas de acion. 3. Ella da una actuation expectacular...don't traslate literally it has to have the same meaning as it does ...

*October 27, 2008*

**chemistry**

what are the properties affected by intermolecular forces? please help

*October 27, 2008*

**Chemistry/please check**

Calculate the amount of heat in kilojoules reased when 50 of steam at 125 C are converted to 50 grams of ice at -125 C. AHsteam = m * Cp steam * At q1= 50g * 4.184 J/g C * (125-100)C= 5.23 x 10^J q2= m * AH 50g * 5230 J/g = 2.61 x 10^5 J q3= 50g *4.184 J/g C * (100-0)C= 2.10 ...

*October 27, 2008*

**chemistry**

is this the right anser? for this problem please let me know thanks calculate the amount of heat in kilojoules released when 50 grams of steam at 125 C are converted to 50 grams of ice at -125 C so 50 grams of H2O Ti= 124 C Tf= -125 C q=? J=? q=m *Cp * At J= 50g * 4.184J/g C...

*October 27, 2008*

**chemistry**

oh i see m ok thanks

*October 27, 2008*

**chemistry**

if so then the solution will be Delta T= Kf * M T= 7.0 C/m * O.474mol/g T=3.32 C The freezing point of the solution will be 5.7 C - 3.32 C = 2.38 C please let me know if this is correct? please

*October 27, 2008*

**chemistry**

from the texbook K(f)= 5.12 C/m but from the exercise is 7.0 C/m which one should i use to solve fro the freezing point? please help

*October 27, 2008*

**chemistry**

thansk

*October 27, 2008*

**chemistry**

i need to know if I am in the right tract please let me know...I am calulating the molality of the following exercise so I could be able to apply the formula T=Kf * molality calculate the freezing point of a solution containin 12.2 grams of benzoic acid, dissolved in 250 grams...

*October 27, 2008*

**Chemistry**

calculate the freezing point of a solution containing 12.2 grams of benzoic acid, dissolved in 250 grams of nitrobenzene. the freezing point of nitrobenzene is 5.7 celsius and its freezing point depression constant is 7.0 celsius/m. please help

*October 27, 2008*

**Chemistry**

thanks I think i got it now

*October 27, 2008*

**Chemistry**

Calculate the amount of heat in kilojoules released when 50 grams of steam at 125 C are convert to 50 grams of ice at 125 C please help

*October 27, 2008*

**Chemestry**

where you got the 7.7 from? and how you calculate the molality for it. I am stuck please help

*October 26, 2008*

**History**

I just have one more question on this matter; does the Congress's power to declare treason to a person/ establish inferior courts in states pertain to the federal territories as well?

*October 19, 2008*

**History**

Thank you for your help.

*October 19, 2008*

**History**

What authority does Congress have over other states according to Article III of the Constitution? Over federal territories?

*October 19, 2008*

**Math**

Thanks drwls for the good explanation =)

*October 17, 2008*

**Math**

Hi drwls, Just wondering, does the word "under" in the question influence the question at all? Thanks for your reply! =)

*October 17, 2008*

**Math**

Hi guys, In the question "It is given that P (0, 3), Q(7, 5), R(9, -2) and S are vertices of a square. A circle A passes through the points P, Q, R and S. Find the equation of this circle. Hence or otherwise find the equation of circle B which is the image of A under the ...

*October 17, 2008*

**Writing prompt**

Hi Jherica Holland, You have posted several questions regarding the 18th century. What I suggest is for you to search "the 1800's" on Google. There are some personal recounts which you could use as reference material. Hope I helped. Thanks! :)

*October 16, 2008*

**Chemistry**

Hi Bo, we have several indicators, including litmus, universal indicator, bromothymol blue, methyl orange, and screened methyl orange. There are many, and the list can go on forever, but these are most commonly used. The best, in my case, would be universal indicator or litmus...

*October 16, 2008*

**writeing promot on the 1800's**

O_o didn't consider that haha :)

*October 16, 2008*

**writeing promot on the 1800's**

Hi brittany lasseigne, what do you need help with? There are many points of comparison you could consider jotting down. You could try to talk to grown ups who have lived through the 1800's as children. Here's some starting material for you (Please do not copy, this is ...

*October 16, 2008*

**Math Calculus**

Thanks ^^

*October 16, 2008*

**Math Calculus**

Hi, I don't have any question specifically but I'm very confused on this. In integration to find area under/above a curve, when do you integrate: 1) with respect to y 2) with respect to x 3) using x coordinates 4) using y coordinates Thanks for your help! :)

*October 16, 2008*

**chemistry**

Hi Anonymous, Truthfully speaking I don't know much about ozone cracking. However, seeing that no one has answered your query for almost two hours, I will try to help. The definition of ozone cracking as stated in Britannica Encyclopedia is as such: "Atmospheric ozone...

*October 16, 2008*