Thursday

May 5, 2016
Total # Posts: 1,789

**Chemistry**

A 0.18 g sample of unknown was placed in a flask and dissolved in 125 mL of deionized water. A solution of HCl (0.13 M) was used to titrate the sample, and 16 mL was required to reach the endpoint. What is the formula weight of the unknown?
*April 24, 2016*

**Algebra**

Please help ASAPPP!!!! I have no idea how to even start on this! f(x)=9x^3+2x^2-5x+4 and g(x)=5x^3-7x+4. What is f(x)-g(x)? Show all of your steps and wrote your final answer in factored form. If someone could help me work through this problem that would be great!
*April 20, 2016*

**physics**

Two electrically-charges spheres are suspended from insulated threads a certain distance from each other. There is a certain amount of electrostatic force between them. Describe specifically (not just increase or decrease) what happens to this force in each of the scenarios ...
*April 9, 2016*

**Math**

Company A charges $5 plus $0.10 per kilometre, company B charges $1 plus $.50 per km how far could you go and still pay less then company A? you need to use a inequality is what the teacher said
*April 3, 2016*

**Science**

The water in a puddle has a mass of 1500 grams. The sun comes out and the puddle evaporates. How many grams of water vapor enter the air from the puddle?
*March 31, 2016*

**Math**

What is the largest whole number that will round up or down to 900900900 if we're rounding to the nearest hundred
*March 22, 2016*

**Math**

please show me how to do this... A statement Sn about the positive integers is given. Write statements S1, S2, and S3, and show that each of these statements is true. Show your work.Sn: 12 + 42 + 72 + . . . + (3n - 2)2 = n(6n^2-3n-1)/2 Also, please show ...
*March 14, 2016*

**chemistry**

at certain altitude in the upper atmosphere, the temperature is estimated to be -100 degree celsius and the density just 10^-9 that of the earth's atmosphere at STP. Assuming a uniform atmosphere at STP. Assuming a uniform atmospheric composition, what is the pressure, in ...
*March 14, 2016*

**calculus**

Find the point on the line –3x+4y–5=0 which is closest to the point (0–5)
*March 10, 2016*

**Math**

Eric's notebook has 30 pages he wants to number all the pages beginning with 1 how many digits will he write when he writes in his notebook
*March 9, 2016*

**Chem**

The three substances that can reduce Ag+ to Ag, but will not reduce Sn2+ to Sn are Zn Pb H2 Mg Cu I2 Al Ca
*March 1, 2016*

**chemistry**

The three substances that can reduce Ag+ to Ag, but will not reduce Sn2+ to Sn are Zn Pb H2 Mg Cu I2 Al Ca
*March 1, 2016*

**Finite**

Kane Manufacturing has a division that produces two models of hibachis, model A and model B. To produce each model A hibachi requires 3 lb of cast iron and 6 min of labor. To produce each model B hibachi requires 4 lb of cast iron and 3 min of labor. The profit for each model ...
*March 1, 2016*

**Algebra**

The lighting for a billboard is provided by solar energy. If 6 energy panels generate 10 watts of power, how many panels are needed to provide 550 watts of power?
*March 1, 2016*

**Chemistry **

The three substances that can reduce Ag+ to Ag, but will not reduce Sn2+ to Sn are Zn, Pb, H2, Mg, Cu, I2, Al, Ca
*February 29, 2016*

**Calculus**

thank you very much! It has taken me almost 2 hours to do this
*February 26, 2016*

**Calculus**

Water is leaking out of an inverted conical tank at a rate of 13500.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 12.0 meters and the diameter at the top is 5.5 meters. If the water level is rising...
*February 26, 2016*

**Chemistry **

2NO + O2 yield 2NO2 Suppose that a particular moment during the reaction nitrogen monoxide (NO) is reacting at the rate of 0.074 M/s -1. At what rate is NO2 being formed?
*February 10, 2016*

**algebra **

The sum of two and the product of one and a number xx.
*February 8, 2016*

**Physics**

How do you calculator the percent error from a graph?
*February 5, 2016*

**Physics**

What would the percent error of the experimental value of g be if the accepted value is 9.8 m/s^2? The slope equation is y=.5001430132x-.0109639087
*February 5, 2016*

**Physics**

What would the experimental value of g be if the slope of the graph represents 1/2 g and the equation is y=5.00x-.0109639087
*February 5, 2016*

**Algebra 2**

I'm sorry I don't really get matrices, but can you please walk me through the steps of algebraically doing elimination if you know what that is.
*January 29, 2016*

**Algebra 2**

Solve each system. x-4y-6z=-34 -7x+5y-7z=-24 z=5x-7y+18 These are my answers below but I know that they are wrong: x=-3894 y=-112852 z=-107,509,144 I have tried to solve this system probably 10 times, and still not getting an answer that checks back into the original equation...
*January 29, 2016*

**Chemistry 102**

Using your average value for Kc (6.92x10^2) and the concentrations provided for the reactants (0.00111mol/L for both), determine the absorbance expected when a 16.00mL of Fe3+ is reacted with 10.00ml of SCN and measured in a 1.00cm cuvette.
*January 27, 2016*

**Math **

4e^(-.03x)-7=13
*January 13, 2016*

**Algebra**

A=Lw P=2L+2w 400=2L+2w 400-2L=2w -2L=-400+2w L=200-w A=(200-w)(w) A=200w-w^2 A=-w^2+200 -b ----- = 2a -200 -------= 2(-1) -200 ------- = -2 100 Y=400-100 Y=300 So the. Would the length for each side of the rectangle be 50 and the width be 150?
*January 12, 2016*

**Algebra**

You have 400 feet of fencing to enclose a rectangular plot. Find the length and width of the plot that will maximize the area. What is the largest area that can be enclosed? I'm not sure how to start. We haven't learned this yet in class.
*January 12, 2016*

**Math log equation **

5^2x+20*5^x-125=0
*January 11, 2016*

**Math log help**

Log3(x)=log9(6x)
*January 11, 2016*

**Math**

Yes
*January 11, 2016*

**Math**

10^3x-8=2^5-x
*January 11, 2016*

**Math**

Log3(x)=log9(6x)
*January 11, 2016*

**Math logs**

10^3x-8=2^5-x
*January 11, 2016*

**Algebra logs please help**

Log3(x)=log9(6x)
*January 11, 2016*

**chemistry **

Mno4- + So3-2 = Mno2 + sO4-2 (in neutral solution,but H+ ions will appear in the final question) solve this redox reaction and give me the method also Thank you
*January 10, 2016*

**Math**

what are the inputs of the following funtions {(-3,2),(-4,2),(8,3),(7,1)}
*November 20, 2015*

**college algebra**

The rodent population in a city is currently estimated at 70,000 and is growing according to the Malthusian model. If it is expected to double every 3 years, when will the population reach one million? (Round your answer to one decimal place.)
*November 12, 2015*

**Calculus**

You need to do the fencing of two side by side areas with 102 meters of wood fencing. What is the maximum area that you will be able to enclose?
*October 25, 2015*

**Math**

Simplify 3^2 x 5^-3 x 2 Divided by 2^-8 x 3^5 So confused!!
*October 20, 2015*

**Physics **

A ship sets sail from Rotterdam, The Netherlands, heading due north at 5.00 m/s relative to the water. The local ocean current is 1.54 m/s in a direction 40° north of east. What is the velocity of the ship relative to the earth?
*October 1, 2015*

**Physics, math**

What is the answer to this? I don't understand how to solve it. 1.2 = 4.6 tan 50 - 4.9 (4.6^2)/(x^2 cos^2 50)
*September 27, 2015*

**Physics**

A basketball player shoots a free throw at a 50 degree angle. Assume the ball is released at a height of 1.8 meters, the hoop is 3 meters off of the floor and 4.6 meters away from the shooter. With what velocity should the player release the ball to hit nothing but net? I have...
*September 27, 2015*

**Physics**

A basketball player shoots a free throw at a 50 degree angle. Assume the ball is released at a height of 1.8 meters, the hoop is 3 meters off of the floor and 4.6 meters away from the shooter. With what velocity should the player release the ball to hit nothing but net?
*September 27, 2015*

**english help please!!**

I think the reason that she never read the novel is because the teacher gives you only one chapter at first so that you can try to guess the theme of the novel.
*September 23, 2015*

**Math**

A car travels 480 miles on 15 gallons of gasoline. How many miles does the car travel per gallon? My work Myself shows the answer is 32 mi/gal
*September 17, 2015*

**History**

Strong Monarchs and large nation-states in the 1400 helped to? A.increase interest in exploration B.overthrow the bristish empire C.decrease the demand for spices D.make all Europeans wealthy I think its b but please help
*September 2, 2015*

**Math**

A bag contains 5 red, 7 yellow, 8 green markers. What is the p(two green markers) will be chosen if the markers are not replaced as they are chosen?
*September 1, 2015*

**Math**

What is the circumference of a circle with a point at the center located at (7,5) and a point of the edge (7,12)? Tell me how you can find the answer!
*August 31, 2015*

**Math**

Kevin is riding a bike with a 1.5 feet diameter. If the tire makes 100 rotations, how far has Sherry traveled? don't tell me the answer show me how you can find the answer?
*August 30, 2015*

**Math**

What is the probability of rolling two dice and getting 3 and a 6? and could you explain how you would get the answer?
*August 27, 2015*

**Algebra**

Alexis bought x boxes of cereal for $3 each, including tax, and paid with a $20 bill. Which expression represents the total amount of change she should receive. Whats the answer?
*August 25, 2015*

**Maths**

How much pure alcohol has to be added to 400ml of a solution containing 15% alcohol to change the concentration of alcohol in the mixture to 32%?
*July 7, 2015*

**math**

60kg
*July 6, 2015*

**Physics**

A 5.0cm tall object is placed 16cm from a convex lens with a focal length of 8.4cm. What are the image height and orientation?
*May 19, 2015*

**physics**

a convex mirror has a focal length of -10.0cm. what is the image position for an object that is placed l20.0cm from the mirror?
*May 19, 2015*

**physics**

marco pushes a stalled car 20 meters with a constant force of 500N in 50 seconds. Calculate the average power marco required to move the car.
*May 19, 2015*

**physics**

how much work is done lifting a 75 kg child 1.75m?
*May 19, 2015*

**physics**

In a tug of war match, each side pulls with a force of 500N, but the rope does not move. How much work is done?
*May 18, 2015*

**Chemistry - Equilibrium**

(h) If a catalyst was added to the reaction, which quantities would change? (Select all that apply.) - the potential energy of the products - the potential energy of the reactants - the potential energy of the activated complex -the activation energy for the reverse reaction...
*May 17, 2015*

**physics**

a car rounds a curve with a radius of 45.0 m at a speed of 22.0 m/s. What is the centripetal acceleration of the car? please show work
*May 15, 2015*

**Trig Identities**

Thank you so much! I understand it now.
*May 12, 2015*

**Trig Identities**

Prove the following identities: 13. tan(x) + sec(x) = (cos(x)) / (1-sin(x)) *Sorry for any confusing parenthesis.* My work: I simplified the left side to a. ((sinx) / (cosx)) + (1 / cosx) , then b. (sinx + 1) / cosx = (cos(x)) / (1-sin(x)) I don't know how to verify the ...
*May 12, 2015*

**Math**

Give three additional polar coordinate pairs for the Point B: (-3,2π/3). -2 < π < 2
*May 12, 2015*

**Math**

A 12 foot-high pole casts a 9 foot long shadow, at the same time of day, what would be the length of a shadow cast by a 45 foot-long tree
*April 7, 2015*

**Physics. URGENT Help Please**

The last question is. 355 nm b/c 440/1.24= 355 but I still need help on the other questions please
*April 2, 2015*

**Physics. URGENT Help Please**

What is the separation of colors in a rainbow produced by? (Points : 1) different diffraction for different wavelengths different interference for different wavelengths <--- different refraction for different wavelengths difference in total internal reflection for ...
*April 2, 2015*

**science**

atom has three different atom.What was it? proton.
*March 25, 2015*

**Statistics**

The Economic Policy Institute periodically issues reports on wages of entry-level workers. The institute reported that entry-level wages for male college graduates were $21.68 per hour and for female college graduates were $18.80 per hour in 2011 (Economic Policy Institute ...
*March 23, 2015*

**Biology**

Would an atom of silicon form an ionic bond with an atom of helium? Why or Why not?
*March 8, 2015*

**Biology**

I believe they should stop as well, but the only reason can come up with is the example of cars and electric cars now
*February 27, 2015*

**Biology**

Do you think that the countries producing sulfur dioxide emissions should compensate their neighbors for the damage being done?
*February 27, 2015*

**Math**

If x=<-6,21>, then 1/3x= Write the final answer in <x,y> form.
*February 25, 2015*

**Homework (Math)**

I know that I'm using the Law of Cosines, but I'm confused on how to solve. I have to also round my answers to the nearest tenth for degrees and to the nearest hundredth for sides. Given: A= 55 degrees b=3 c=10 Find: a= B= C=
*February 25, 2015*

**Math Check**

Can someone check to see if I'm right? Thanks! Question: Determine if v and w are equal If v = Ray AB and w = Ray CD, where A (23, 11), B (10, 15), C (13, 15), and D (0, 11. (True or False) My answer: False
*February 25, 2015*

**math**

Find the limit. lim x→∞ sqrt(x^2+9)
*February 11, 2015*

**English 2**

In Our Town, by Thorton Wilder, what does the rain symbolize?
*February 9, 2015*

**Physics**

When going up stairs does a person who has more mass do more work and exert more power?
*February 9, 2015*

**Social studies (ms.Sue I really need your help)**

Is it A
*February 4, 2015*

**Social studies**

Which of the following increased south Carolina's desire to secede from the union? A.John Brown's raid on Harpers Ferry*** B.Brooks' response to summer's speech C.the proslavery constitution submitted by Kansas D.the decline of the Whig party
*February 4, 2015*

**Art check please**

Oh nice I bet that was a sight to see! Thank you so much
*January 23, 2015*

**Art check please**

Is #2 B I read somewhere that they couldn't be viewed but it doesn't give a clear answer in my lesson about this one Thanks
*January 23, 2015*

**Art check please**

1. Rust on an artifact is an example of (1 point) chemical decomposition ******* chemical preservation physical decomposition physical preservation 2. What “preservation controversy” developed over the years relating to Michelangelo’s paintings in the Sistine ...
*January 23, 2015*

**chemistry**

What mass of KBr is contained in 50.0 mL of a 5.10 M solution of KBr?
*January 23, 2015*

**English**

Oh I am sorry I thought it was wanting a metaphor Urban is City correct?
*January 22, 2015*

**English**

In these lines from concrete mixers which context word provides a synonym for urban concrete mixers are urban elephants, Their trunks are raising a city a)Concrete b)Elephants ******THIS ONE**** c)raising d)city
*January 22, 2015*

**ART HAVING HARD TIME**

Thank you so much
*January 22, 2015*

**ART HAVING HARD TIME**

Would you think #2 for question 5 then I honestly am confused on this one
*January 22, 2015*

**ART HAVING HARD TIME **

1. A curator decides to display an eighteenth-century painting in a windowless room with controlled temperature and humidity. Pick the answer that best describes the reasons for her choice: (1 point) 1)The curator wants to make sure that the temperature and humidity are ...
*January 22, 2015*

**PHYSICS**

The driver of a car traveling at 25.0 m/s applies the brakes and undergoes a constant negative acceleration of magnitude 2.50 m/s2. How many revolutions does each tire make before the car comes to a stop, assuming that the car does not skid and that the tires have radii of 0....
*January 15, 2015*

**history**

Question 2 (04.05 MC) Using the map and your knowledge of U.S. history, what do the details of the Rocky Mountains suggest about the Lewis and Clark expedition? The group made a grave mistake in not turning back in Missouri. The group really could have traveled by river all ...
*January 12, 2015*

**math**

In a scale drawing of a house, the living room is 1 in. long. The actual length is 24 ft. The actual width of the living room is 18 ft. The width on the drawing is __________ in. (Find the width on the drawing). Show your work in every step to receive full credit.
*January 9, 2015*

**math problem solving **

points p and q are trisection points on segment ab. if aq= 7x+6 and pq= 3x+5 find all possible values for the length of ab
*January 5, 2015*

**Math**

points p and q are trisection points on segment ab. if aq= 7x+6 and pq= 3x+5 find all possible values for the length of ab?
*January 5, 2015*

**Algebra 1**

2x(3xy + 4y² + 8y) 6x²2xy + 2x4y² + 2x8y 12x² + 10y²
*December 30, 2014*

**math algebra**

Mauryn wrote the following Sandwiches at king sandwich cost same amount and include bread, meat, cheese, lettuce, and tomato. All other veggies are extra. Sam bought a chicken sandwich with 3 extra veggies for $5.25. Erin bought roast beef sandwich with 5 extra veggies for $6....
*December 18, 2014*

**math algebra**

The length of the diagonal across the front of a rectangular box is 25 inches, and the length of the diagonal across the side of the box is 20 inches. The length of a 3 dimensional diagonal of the box is 28 inches. What is length of the diagonal across the top of box? A. 15.5 ...
*December 18, 2014*

**math algebra**

Wasn't putting 0 in for slope... thanks
*December 18, 2014*

**math algebra**

What is slope of line 8y = -16? a. 0 b. 2 c. 16 d. undefined dont have a clue how to do this
*December 18, 2014*

**math algebra**

Thanks, could get 7 , but didn't know what to do after...
*December 18, 2014*