Sunday

September 25, 2016
Total # Posts: 1,755

**chemistry**

A liquid was analyzed to be 54.5% C, 9.10% H, and 36.4% O. An empty flask, whose mass was 45.32 g, when filled with the vapor of the liquid at 735mm Hg and 99.2°C had a mass of 46.05 g. The volume of the flask was found to be 263.2 mL. empirical formula -> C2H4O What is...

*April 16, 2012*

**Pre-Calc !!!**

Prove the identity. 2tanx/1+tan^2x=sin^2x

*April 16, 2012*

**chemistry**

A closed container has a mixture of methane, CH4, ethane C2H6, and propane C3H8. If 12.5 g of methane, 36.0 g of ethane, and 14.0 g of propane have a total pressure of 890. mm Hg, what is the partial pressure of each of the gases in the container?

*April 15, 2012*

**College Comp II**

What is the meaning & how did you figure it out? thanks March for a One Man Band by David Wagoner He’s *a boom a blat* in the uniform Of an army *tweedledy* band *a toot* Complete with medals *a honk* cornet Against *a thump* one side of his lips And the other stuck with...

*April 12, 2012*

**Comp II**

Need to write a 1000 word essay about this, but I can't figure out what the poem is even about. What is the meaning & how did you figure it out? thanks March for a One Man Band by David Wagoner He’s *a boom a blat* in the uniform Of an army *tweedledy* band *a toot* ...

*April 12, 2012*

**ENGLISH HELP**

What is this poem's meaning and how did you understand it? March for a One Man Band by David Wagoner He’s *a boom a blat* in the uniform Of an army *tweedledy* band *a toot* Complete with medals *a honk* cornet Against *a thump* one side of his lips And the other ...

*April 12, 2012*

**Chemistry**

thanks

*April 2, 2012*

**Chemistry**

the only chromate used was the amount present in 1mL of Mohr's indicator. Does it matter if no addition chromate was added?

*April 2, 2012*

**Chemistry**

Using the total volume at endpoint (51.98mL) and the fact that the concentration of CrO4 ^2- due to Mohr's indicator is 0.26 M, find the actual concentration of CrO4^ 2- at the endpoint (or at the instant just before Ag2CrO4 begins to form). Any help I am completely lost ...

*April 2, 2012*

**Math**

What is the number of revolutions in a 450pi radians

*March 30, 2012*

**math**

84.8cm

*March 29, 2012*

**math**

31 lbs of bananas cost $248. How much would 40 lbs cost?

*March 28, 2012*

**Physics**

A rectangular loop of wire, L = 26.2 cm and W = 15.4 cm, carries a I1 = 1.83 A current and lies in a plane (d = 13.6 cm), which also contains a very long straight wire carrying a I2 = 10.5 A current. I used this equation: F1+F2 = mu0*I1*I2*0.262/(2pi)*(1/0.136-1/0.290)=2.57*10...

*March 24, 2012*

**All Sub**

Yeah im talking about grades.

*March 24, 2012*

**All Sub**

If you have 21 questions and you miss 2 whats your score? How do you find out?

*March 24, 2012*

**geometry**

rectangle a is similar to smaller rectangle b. the scale factor is 5/3. if the area of rectangle a is 150 square inches, what is the area of rectangle b?

*March 22, 2012*

**Physics - Static Forces**

Blocks 1 & 2 are connected by a string. Block 1 is on an incline & has a mass of 5.4kg. Block 2 is hanging from the string & has a mass of 2.1kg. The coefficient of friction is 0.22 between all surfaces. 1: What is the minimum angle "theta" can be while keeping the ...

*March 18, 2012*

**CAL 2**

Use Euler's method with step size 0.2 to estimate y(1), where y(x) is the solution of the initial-value problem y'=5x+y^2, y(0)=-1 y(1)=

*March 15, 2012*

**english 11**

4. Which of the following statements about Anne Bradstreet is NOT true? (1 point)Anne Bradstreet was never married. Anne Bradstreet was the first published poet in America. Anne Bradstreet was born and educated in England. Anne Bradstreet favored poems with regular rhyme ...

*March 14, 2012*

**cal 2**

Use Euler's method with step size0.4 to estimate y(2) , where y(x) is the solution of the initial-value problem y'=5x+y^2, y(0)=1. Y(1)=

*March 12, 2012*

**English 11**

Thanks Roscoe if these are true...

*March 12, 2012*

**physiscs**

a 75w and 50 w incandescent light bulbs are designed fot use with the same voltage. what is the ratio of the resistance of the 75- w bulb to the resistance of the 50 w bulb?

*March 8, 2012*

**physics**

the elecric potential at a certain point is space is 12 V. What is the electric potential energy of a -3.0uc charge placed at that point? is it +36uj?

*March 8, 2012*

**physics**

A -4.0UC charge is located 0.45m to the left of a +6.0uc charge. what is the magnitude and direction of the electrostatic force on the positive charge?

*March 8, 2012*

**english**

I have a Question about The Merchant of Venice By william shakspear. What are Some promises made in the stor??? Please help!

*March 4, 2012*

**math**

For the next three problems, evaluate each expression if x = −2, y = 4, and z = −3. (4 − 2x)−2 (y − z)−3 (x − 5y)0

*March 1, 2012*

**math**

Rewrite using only positive exponents: x−5y3. ??

*March 1, 2012*

**math**

Write an expression for the volume of a rectangular prism if the length is 5 feet shorter than some x amount, the width is 3 feet longer than x, and the height is x feet.

*March 1, 2012*

**algebra**

(-5,-2,) end point (-7,-5) mid point, how do I find another end point?

*February 29, 2012*

**Spanish-Thank you Srs JMcGin and Ricardo8th grade**

Sra, Thank you for responding. I use spanishtypeit to do accents but I actually forgot the accents in both words above Thank you again and thank you Ricardo also for responding

*February 29, 2012*

**Spanish-8th grade**

Thank you Ricardo-it was a spelling mistake with te should be de but I see where I made the other mistake. Thanks again.

*February 29, 2012*

**Spanish-8th grade**

I'm having a problem answering some questions we're learning about shopping and stuff like that so could someone check these please. 1. ¿Qué buscas cuando vas te compras? Busco variedad de cosas cuando voy me compro. 2. ¿Quien es la persona mas de ...

*February 29, 2012*

**Mathematics**

A rectangular block of lead with dimension 43 cm x 53 cm x 63 cm is melted to mould spherical balls of 3 cm radius. How many balls are made? (Round your answer to the nearest whole number and take Pi as 3.14)

*February 29, 2012*

**algebra 2**

Graph the function f(x) = –3x^3 + 9x^2 – 2x + 3 using graphing technology and describe the end behavior

*February 28, 2012*

**Chemistry**

I need help with finding the theoretical yield of Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g). So far I have 24.305 + 37.4688 = 61.7738 g based on the weight of MgCl2 + H2, but I'm not exactly sure what to do or if I've even started it properly. Also, if you could help ...

*February 28, 2012*

**Precalculus**

Solve Cos^2(x)+cos(x)=cos(2x). Give exact answers within the interval [0,2π) Ive got the equation down to -cos^2(x)+cos(x)+1=0 or and it can be simplified too sin^2(x)+cos(x)=0 If you could tell me where to go from either of these two, it would be great help.. Thankyou ...

*February 23, 2012*

**ASHFORD**

Identify two distinct fallacies you see committed in the media.

*February 23, 2012*

**Algebra 2**

My question involves "Graphic Representation of Radicals of the Second Order" I know that the length of the hypotneuse of a right triangle equals the square root of the sum of the lengths of the two legs. The problems I'm having trouble with are the square roots ...

*February 23, 2012*

**math**

(4m-20)(7m)/(5m-25)(28)

*February 23, 2012*

**chemistry**

3. Answer the following questions: For each question show a balanced chemical equation and show all calculation for full credit. a. Assume that you had 100 nuts (N) and 75 bolts (B). How many NB molecules could you make by screwing one nut onto each bolt?

*February 23, 2012*

**consumer math**

6. These items were on Cyril's last credit card statement. Last Balance Payment Periodic Rate New Charges $567.18 $120.00 1.56% $45.17 What is his new balance? (Points : 1)

*February 22, 2012*

**science **

i come u face???

*February 22, 2012*

**Chemistry**

Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 18.9 g of biphenyl in 26.4 g of benzene?

*February 22, 2012*

**consumer math**

23. Jeremy had a starting balance of $122.00 in his savings passbook. He made these transactions: Deposits of $68.52 and $46.35; Withdrawals of $95.00 and $20.50; Interest $1.50. What is his final balance? (Points : 2) $125.22 $120.22 $112.22 $122.87 24. Banks pay interest on ...

*February 21, 2012*

**Chemistry**

When 4.73 g of a nonelectrolyte solute is dissolved in 965 mL of water at 28 °C, the resulting solution exerts an osmotic pressure of 945 torr. What is the molar concentration of the solution? How many moles of solute are in the solution? What is the molar mass of the solute?

*February 21, 2012*

**statistics**

What probability value should be used for determining whether the modified process results in a defect rate that is less than 6%. I got part a and b of the question but I am completely lost on what this is asking me. Can anyone help?!?

*February 10, 2012*

**US Government**

Doing my homework!

*February 8, 2012*

**chemistry**

When do you put the suffix (g) after a compound?

*February 2, 2012*

**statistics**

the answer is the standard deviation is 6 but i dont know how to get that

*January 31, 2012*

**statistics**

the distribution of scores on a test is mound shaped and dsymmetric with a mean score of 78. if 68 percent of the scores fall between 72 and 84, what is the stand deviaition

*January 31, 2012*

**trigmsu**

csc(θ) / cot(θ)

*January 30, 2012*

**trig**

Use a ratio identity to find tan(θ) if given the following. sin=6/sq rt 37 and cos 1/sq rt 37

*January 26, 2012*

**trig**

Find the remaining trigonometric ratios of θ if sin(θ) = -1/6 and θ is not in QIII cos tan cot csc sec

*January 26, 2012*

**trig**

Give the reciprocal of the following. 7/15

*January 26, 2012*

**trig**

If sin(θ) = 8/17 and θ terminates in QI, find cos(θ)

*January 26, 2012*

**trig**

Find y if the point (7, y) is on the terminal side of θ and cos(θ) = 7/25

*January 25, 2012*

**Chemistry**

A certain substance has a heat of vaporization of 34.65 kj/mol. At what kelvin temperature will the vapor pressure be 3.50 times higher than it was at 331 k?

*January 25, 2012*

**5th grade math**

A pair of shorts would cost 12 dollars. I solved it by setting the two equations equal to one another. 2T+2S+42=T+3S+45 Minus 42, minus t, minus 2S gives: T=S+3 So you know S is 3 more than T. Then just trial and error solve to get shorts are 12 dollars and tshirts are 9.

*January 24, 2012*

**geometry**

In parallelogram ABCD, BC = 8, DC = 12, and measure of angle D is 50 degrees. Find the area of the parallelogram to the nearest tenth.

*January 23, 2012*

**physics**

A piece of metal with a mass of 1.9 kg, speciﬁc heat of 200 J/kg ◦ C, and initial temperature of 100 ◦ C is dropped into an insulated jar that contains liquid with a mass of 3.9 kg, speciﬁc heat of 1000 J/kg ◦ C, and initial temperature of 0 &#...

*January 17, 2012*

**Algebra II-Please check**

I'm sorry the computer jammed on an earlier post and I couldn't do anything-so here is the problem I need asistance with Please check and offer advice-I'm NOT SURE IF I USED CORRECT FORMULAS-thank you the problem is List the center, vertices, and foci of hyberbola ...

*January 13, 2012*

**algebra-Please recheck this**

I think I did the vertices and foci incorrect This is a verticl hyperbola, correct? So formula for vertices would be (h, k+-a)=(8,2+-6)=(8,8) (8,-4) Foci should be c^2 = a^2 + b^2 8^2 + 2^2 = 64+36 c=10 foci=(8,2+-10) (8,-8) (8,12)

*January 13, 2012*

**AlgebraIIPlease check-sorry my computer jammed**

I'm sorry the computer jammed and I couldn't do anything- the problem is List the center, vertices, and foci of hyberbola for following equation: (y-2)^2/36 - (x-8)^2/64 = 1 b=6 a=8 Center(8,2) Vertices=(h,k+b) (h,k-b)=(8,8) (8,-4) Foci =(h +-c,k) c^2 = a^2 + b^2 c^2...

*January 13, 2012*

**algebra**

¯3 x 5 + ¯36 ÷ ¯3 -- ¯7 — 10 + 6 x ¯8 ÷ ¯24 —1 =

*January 13, 2012*

**algebra 1**

formula A=P(1+r)^t An account earning interest at a rate of 4% has a principal of $500,000. If no more deposits or withdrawals are made, about how much money will be in the account after five years?

*January 5, 2012*

**penn foster Main ideas**

Both Greta and Fred were on the bus that arrived in Pittsburgh. Fred was glad to be home. He looked forward to visiting with old friends. Greta, on the other hand, dreaded seeing her old boyfriend. She already missed her days in New York City. 16. What can you most safely ...

*January 5, 2012*

**algebra 1**

The midpoint of XY is point M(-12,5). If the coordinates of X are (3,-3), what are the coordinates of Y?

*January 4, 2012*

**math**

Frances sells greeting cards. The materials for a card cost $2.40, and she will include an 80% markup. What is the selling price of each card?

*January 3, 2012*

**Physics**

6meter west

*December 18, 2011*

**algebra**

-10-3/7x=5

*December 18, 2011*

**Algebra **

10A^8/7V^3 TIMES 49R^7/100A MULTIPLY AND SIMPLIFY

*December 17, 2011*

**Algebra**

THANK YOU!!!

*December 17, 2011*

**Electric Power Tools**

just checked you answers, 100% correct

*December 15, 2011*

**Statistics**

9. Assume the weight, W, of a randomly selected adult has a normal distribution with a mean of 175 pounds and a standard deviation of 10 pounds.. Find the probability, P(W < 190), that a randomly selected adult weighs less than 190 pounds.

*December 13, 2011*

**Pre Calculus**

Newton's law of cooling T(t)= Tm + (To-Tm)e^-kt, k >0\ Evaluate T(0). Simplify and explain the result I'm very confused on how to do this, i think i will be able to explain the result but if you could help me simplify this that would be great, Thank you very much.

*December 12, 2011*

**trig**

I get the second one, but the first I don't. What identity are you using for the first to get from line one to two?

*December 11, 2011*

**trig**

Getting ready for trig semester finals. Can't figure out how they are simplifying these equations. (these are the review not actual test) tanx-sqr3=2tanx and 2sin^2+sinx=0

*December 11, 2011*

**Physics**

C. A small force over a long time period. With the small force being divided by a larger number (time), it will have the least momentum.

*December 9, 2011*

**science**

Cool it

*December 8, 2011*

**math**

What is the scale on a map that shows two cities that are 400 mi apart as 2.5 in apart?

*December 8, 2011*

**physics**

what is your final velocity after 680 meters if you start out at 90km/hr and acceleration is 9 m/s

*December 7, 2011*

**geometry**

The scale drawing for a business office is drawn so that 1 cm = 2 ft. If the length of the model is 4 cm and the width is 9 cm, what is the actual area of the business office?

*December 6, 2011*

**Physics**

What is the acceleration of a proton in an electric field of 10^6 N/C?

*December 6, 2011*

**Physics**

What is the acceleration of a proton in an electric field of 10^6 N/C?

*December 6, 2011*

**phi 103**

Which of the following may not qualify as a falsifiable claim?

*December 4, 2011*

**spanish**

OHHHH I got it! Where does one go when one wants to shop at many different types of stores? Sometimes I'm such a simpleton.

*December 2, 2011*

**spanish**

I'm having problem here with number 5. Vamos al ______ could be any number of things... I would assume it's 'shopping' but that isn't accepted...

*December 2, 2011*

**physics**

A convex mirror has a focal length of 15 cm. A 3.0 cm high object is located 10 cm in front of this mirror. Where is the image located?

*December 2, 2011*

**physics**

A 5 meter diameter telescope is used to observe binary star systems. What is the minimum separation distance (perpendicular to the line of sight) for which the two stars can be resolved if they are at a distance of 1,000 light years = 10 m and they are observed in visible ...

*December 2, 2011*

**physics**

Light shines through a single slit whose width is 1.12 mm. A diffraction pattern is formed on a screen located 4.0 m away. The distance between the middle central bright fringe and the second dark fringe is 4.0 mm. What is the wavelength of the light?

*December 2, 2011*

**physics**

A light ray travels from water to air. If the ray strikes the water/air boundary at an angle of incidence of 46 degrees, what is the angle of refractiob in air? (n water = 1.33)

*December 2, 2011*

**Physics**

a 59kg student jumped off the back of a 42kg sailboat, the boat was already travelling at 3.1m/s before she jumped. if she jumpped off with a speed of 2 m/s, how fast was the boat moving? thanks for any help

*December 1, 2011*

**Science**

Are sunspots cooler or hotter spots in our sun? I think it's cooler

*December 1, 2011*

**Science**

What causes day and night? What's the difference between a solar eclipse and a lunar eclipse?

*December 1, 2011*

**Science**

How does Earth have seasons?

*December 1, 2011*

**Government**

blah

*November 29, 2011*

**calculus**

A growing boy who is 4 feet tall stands 8 feet from a 12 foot lamp post. The boy is growing at the rate of 3/4 inches per year. How fast is his shadow growing (in inches per year)?

*November 25, 2011*

**physics**

You need to move a 135-kg sofa to a different location in the room. It takes a force of 92 N to start it moving. What is the coefficient of static friction between the sofa and the carpet?

*November 23, 2011*

**MATH**

So none of these are correct? 2/3 divided 3/5 = 1 1/9 or 2/5?

*November 22, 2011*