Wednesday

October 7, 2015
Total # Posts: 1,822

**math**

When you do the subtraction shown on the right 4,126 - 2,487, you regroup 1 thousand to 10 hundreds. Does that give you 11 hundreds? Explain
*October 3, 2012*

**honors chem high school**

The topic is Changes in energy Level Calculations. calculate energy value for levels n=1 to n=7; given En=-Rh/n2 R=2.180 x 10 -18 J E=hv h=6.626 x 10 -34 J.s I then need to plot them -- I cannot get started.
*October 3, 2012*

**Math - weighted average?**

This made a lot of sense, thank you for responding! It was able to incorporate it into my program and it seems to work.
*October 3, 2012*

**Math - weighted average?**

I need to create some type of formula that will allow me to interpolate values at specific points in a data set. My data is something like this: I have a list of times, and there are values associated with those times like this: T Readings 1 100 103 105 2 103 101 107 3 102 104...
*October 3, 2012*

**Physics **

Jumping flea. For its size, the flea can jump to amazing heights-as high as 30 straight up, about 100 times the flea's length.
*September 17, 2012*

**calculus HELP**

Find the values of a and b that make f continuous everywhere. f(x) = (x2 − 4)/(x − 2) if x < 2 ax2 − bx + 3 if 2 ≤ x < 3 4x − a + b if x ≥ 3 solve for a and b? HELP ive tried everything
*September 9, 2012*

**spanish**

1. Write a conversation between two friends. One friend invites the other to do an activity (something from this unit) and the other friend agrees to do the activity. Then a third friend joins them and they invite that friend who has to decline because he has something else to...
*September 7, 2012*

**Chemistry pls help!!**

A 32mL solution of 2.7M NaCL is mixed with 83mL of 1.8M HCL. What is the molaritt of the CL in the new solution. Thank you for your help
*September 6, 2012*

**civics**

okay thank you for your help and sorry again for the details
*September 4, 2012*

**civics**

the U.S. sorry for the confusion!!! my bad
*September 4, 2012*

**civics**

What three rivers meet together and form the largest waterway??
*September 4, 2012*

**cicivs**

help me, me, me, me, me, me,me!!!!!! please, please, please, please, please, please, please!!!!! help, help, help, help, me, me, me!!! thank, thank, thank, thank, thank, thank, you!!!!
*September 3, 2012*

**cicivs**

does hawaii have waterways? If yes, please name the waterways of hawaii and how it can help to shape the lives of people living in Hawaii. Please somebody help me because I looked all over my online civics book and i did research on waterways of Hawaii and I still cant even ...
*September 3, 2012*

**chemistry**

A chemist want to make a 10% Chlorine solution from 30% Chlorine solution and pure water. How much of the two should the chemist mix together to make 20mL. Please help with calculations. Thank you
*August 31, 2012*

**math**

I have to go through all the steps and find the midpoints and then the equations of the medians and then do substitution
*August 29, 2012*

**math**

Really need help please!! triangle CDE has vertices C (-2,4) D (6,2) and E (-4,-2) determine the exact location of the centroid
*August 29, 2012*

**ashworth**

The Tao Inc. purchased an asset for $170,000 with a salvage value of $8,500 have a useful life of four years. Find the depreciation expense for the first year using the 150% declining balance method.
*August 3, 2012*

**Physics**

A block on a spring moves in SHM with amplitude 0.23 m and period 3.8 s. The mass of the block is 2.1 kg. What is the total energy of the system? Can someone please take me step by step and show me what my answer should be? Thanks!
*June 24, 2012*

**Physics**

A wave has a frequency of 325 Hz. What is its period? I did 1/325 = 0.003076 & I answered 0.003 and this answer was wrong. Can anyone help me?
*June 15, 2012*

**Physics**

A potter's wheel rotates with an angular frequency of 1.54 rad/s. What is its period?
*June 12, 2012*

**Physics**

The sketch shows a mobile in equilibrium. Each of the rods is 0.16 m long, and each hangs from a supporting string that is attached one fourth of the way across it. The mass of each rod is 0.10 kg. The mass of the strings connecting the blocks to the rods is negligible. What ...
*June 10, 2012*

**Science (simple machines)**

The plank is 3.6 metres long. It is being used as a lever to lift a 40-kilogram box. This represents a load of 400 newtons. (a) If the fulcrum were placed in the centre of the plank, what downward effort would the man on the right need to apply to raise the box? (b) If the man...
*June 10, 2012*

**Physics**

A building with a weight of 5.200e+7 N is built on a concrete foundation with an area of 1300 m2 and an (uncompressed) height of 2.82 m. By what vertical distance does the foundation compress?
*June 9, 2012*

**Physics**

Bob and Ray push on a door from opposite sides. They both push perpendicular to the door. Bob pushes 0.63 m from the door hinge with a force of 89 N. Ray pushes 0.57 m from the door hinge with a force of 98 N, in a manner that tends to turn the door in a clockwise direction. ...
*June 9, 2012*

**Physics :)**

A motor lifts a 70.0 kg box off the ground, starting from rest. In 8.00 seconds it lifts the box to a height of 20.0 m. At that time, the box is moving upward with a velocity of 5.00 m/s. What is the average power of the motor during this time interval?
*June 2, 2012*

**6th grade math**

Find the volume of the right triangular prism. The bases are equilateral triangles with a length of 6 mm. The height of the prism is 8.4 mm. (Round to the nearest tenth.)
*May 28, 2012*

**Parabola**

How do I put this parabola in standard form? Could someone show how they would put it in this form: (x - h)2 = 4p(y - k) 1. 4x^2+24x+128y-988=0 Please help! I'm lost.
*May 25, 2012*

**Parabola**

3y^2+24y+72x-96=0 Can anyone put this in standard form: (y - k)2 = 4p(x - h) All help is greatly appreciated! :)
*May 25, 2012*

**Pecalculs**

Thank you again! ^o^
*May 24, 2012*

**Pecalculs**

Sorry: Precalculus! :P
*May 24, 2012*

**Pecalculs**

Can anyone put this parabola into this standard form: x-h = a(y-k)^2 x^2-12x-48y-372=0 ? Please help!
*May 24, 2012*

**Parabolas in standard form!**

WOW! Thank you so much! you made more sense than my teacher! :D
*May 24, 2012*

**Parabolas in standard form!**

Can you solve this one?: x^2-12x-48y-372=0 & I made a mistake one the second one!! Its actually: x^2+14x+44y+313=0 !!
*May 24, 2012*

**Parabolas in standard form!**

Hello, I am having the worst time trying to solve these parabolas and putting them into x-h = a(y-k)^2 form. :( There are two problems that i keep doing something wrong. could someone solve them so I can have a set up for the rest of my problems? :) 3y^2+6y+108x-969=0 and x^2+...
*May 24, 2012*

**Ellipse equation?**

Thank you, @Steve ! Would you happen to know how to find the Foci for this equation?!?! :)
*May 24, 2012*

**Ellipse equation?**

(x-2)^2 / 49 + (y+1)^2 / 25 = 1 a.) what are the vertices? b.) What are the major and minor axises? I always have troubling understanding how to find these. :( Any help is greatly appreciated!
*May 24, 2012*

**The crucible**

In the Crucible, what was john proctor's difficult decision that was somehow related to the society in which he lived in?
*May 23, 2012*

**Literature**

sorry wrong answers! Disregard.
*May 23, 2012*

**Antigone Literature**

Creon criticizes others for stubbornly refusing to change their minds. Why is this ironic? I believe its ironic because everyone is so caught up in what they think is right, including Creon. I just want another persons opinion on why they think its ironic! :) Its always ...
*May 22, 2012*

**History**

Which one of the following would be a primary source??? A) Your history book B) A letter from a soldier C) A picture of pyramaids D) A website about history HELP!!!
*May 21, 2012*

**trig**

write sin4xcos2 as the sum or difference of two functions. answers: 1/2(cos6x+cos2x), 1/2(cos2x-cos6x), 1/2(sin6x+sin2x), sin6x-sin2x
*May 17, 2012*

**math**

Miss C gives a test to the 10 students in her first-period algebra class. The grades are 93,82,95,86,90,84,89,79,87,93 A. Find the mean and Standard Deviation of the 10 scores. B. List all the reasons for why the late class could have a different mean or standard deviation
*May 17, 2012*

**egypt**

how did the egyptians explain the unknown?????????
*May 16, 2012*

**Math**

Diana practices the piano 45 minutes each day o Sunday, Tuesday, Thursday, and Saturday. How many minutes does she practice the piano each week?
*May 15, 2012*

**history**

also what belief and value did jesus teach
*May 14, 2012*

**history**

how big was the city of rome?
*May 14, 2012*

**language arts**

Thank you Ms.Sue
*May 6, 2012*

**language arts**

How should I fix it?
*May 6, 2012*

**language arts**

Is this sentence a run on? An important decision made by Parvana was when Parvana agreed to go outside to buy food while she was dressed as a boy.
*May 6, 2012*

**math**

For the sequence 0,3,8,15,24,35.... find a formula for tsubn in terms of n.
*May 2, 2012*

**SOCIAL STUDIES PLZZ HELP**

Brasilia and the indengionus way of life
*April 30, 2012*

**physics**

A uranium nucleus 238U may stay in one piece for billions of years, but sooner or later it de- cays into an particle of mass 6.64×10−27 kg and 234Th nucleus of mass 3.88 × 10−25 kg, and the decay process itself is extremely fast (it takes about 10...
*April 29, 2012*

**math**

A geometric series has first term 8 and third term 20 what does the fifth term equal? What does the third partial sum equal?
*April 27, 2012*

**maths**

(a) A random survey of 100 mobile telephone customers indicated that 96 of them had not experienced any difficulties in making mobile calls in the previous 3 months. (i) Derive a point estimate for customer satisfaction levels with the service (ii) Construct a 95% Confidence ...
*April 26, 2012*

**Accounting **

Questions 1. What is the issuing price for bonds A and B respectively? Show your calculations. 2. For bond A, provide the journal entries for • the issuance of bond, and • the first three interest payments. Please write down the date for each journal entry. Show your...
*April 23, 2012*

**intermediate algebra**

I dont know what the AC method is but I would do the following: 2x(3x^2-2x-5) 2x(3x-5)(x+1)
*April 22, 2012*

**Chemistry help!!**

So I got 38.13 mL .. Thank you so much now that I see how to do it, it makes much more sense to me.
*April 22, 2012*

**Chemistry help!!**

A chemist wants to be a supercook and wants to create 8%(m/v) acetic acud solution to be "extra strength" vinegar. if pure acetic acid Is a liquid density of 1.049 g/ml. how many ml of acetic acid should be dissolved to male 500 ml of 8% acetic acid? It says to first...
*April 22, 2012*

**Algebra**

Not sure if this is correct but i 57*x+13*x-5=5 just a guess not sure if this is correct.
*April 22, 2012*

**Chemistry**

A chemist wants to be a supercook and wants to create 8%(m/v) acetic acud solution to be "extra strength" vinegar. if pure acetic acid Is a liquid density of 1.049 g/ml. how many ml of acetic acid should be dissolved to male 500 ml of 8% acetic acid? Calculate grams ...
*April 22, 2012*

**english**

Be sure to develop your speech in the way the audience who you will be talking to will understand, and be sure to make a speech that will catch everyone's attention! Best of luck! :)
*April 22, 2012*

**Government**

Does the U.S. have a responsibility to become involved in Syria or any other country where civilians are being killed by their leaders?
*April 20, 2012*

**Math**

At a track meet, competitors could win gold, silver or bronze medals. Kennedy High Schools track team won a total of 18 medals. Three of the medals were gold. There were twice as many bronze medals as silver medals. How many bronze medals did the track team win?
*April 17, 2012*

**Social Civics**

and thank you for your help!
*April 16, 2012*

**Social Civics**

Yeah I know...civics isnt my cup of tea.
*April 16, 2012*

**Social Civics**

I have heard that they have a 100 word essay. What would it be on?
*April 16, 2012*

**Social Civics**

Does anyone know how to prepare for the final exam for Social Civics for American Schools?
*April 16, 2012*

**english**

The second line is Italic
*April 5, 2012*

**calculus**

Let f(x) = (x − 3)−2. Find all values of c in (2, 5) such that f(5) − f(2) = f'(c)(5 − 2). (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) C=?
*April 1, 2012*

**chemistry**

So what is the answer
*March 30, 2012*

**chemistry**

How many grams of solute are present in 785 mL of 0.480 M KBr?
*March 29, 2012*

**Chemistry**

Predict the color change when an aqueous solution containing Ag+ ion is added to a green solution of the copper (II) ion. It is green because HCL has been added. Thanks.
*March 28, 2012*

**Chem**

How many mL of .150 M sodium hydroxide is required to neutralize 25 mL of .125 M of phosphoric acid?
*March 26, 2012*

**Chemistry**

What mass of solid calcium hydroxide is required to neutralize .100 L of .500 < sulfuric acid?
*March 26, 2012*

**Chemistry**

How many mL of .150 M sodium hydroxide is required to neutralize 25 mL of .125 M of phosphoric acid?
*March 26, 2012*

**math**

Bob finds that the cost of driving his truck is 92 cents per mile. Give a symbolic and graphical representation for a function f(x) that computes the cost in dollars of driving x miles. Assume 0<x<60
*March 25, 2012*

**CHEM, please help!**

What pH buffer solution is needed to give a Ni2+ concentration of 2.5 x 10-3M in equilibrium with solid nickel hydroxide Ni(OH)2? Ksp = 6.0 x 10-16.
*March 18, 2012*

**math**

I had a total of 129 marbles in 3 boxes at first. Then i away 2/3 of the marbles from box1, added 15 marbles to box 2 and added somes to box 3 until the number of marbles in box 3 tripled. As a result, the ratio of the number of marbles in box 1 to the number of marbles in box...
*March 13, 2012*

**Math**

100Ã—431Ã·8576-234+65454Ã—443321167899= [this might be hard]
*February 29, 2012*

**Science**

A student observed two different types of cells under a microscope. She noticed that one cell had many more mitochondria than the other. What can the student predict about the cell with more mitochondria? A. The cell produces more waste. B. The cell makes more proteins. C. The...
*February 27, 2012*

**Chemistry**

FIRST U should find whether there is reaction when they are mixed,and then what is the concentration of the mixture.next,find the concentration of H+ ion,finally,use this formular to solve your problem pH =-log[concentration of H+ ]
*February 26, 2012*

**Art**

These are all of the answers!! Gosh how hard could this possibly be. 1. Alexander Calder invented this type of art. (0 pts) fiber art (1 pt) mobiles (0 pts) stabiles (0 pts) public art 2. Today, decisions in planning, selecting, and/or creating an artwork for public display ...
*February 20, 2012*

**CHEM, please help!**

A 11 mL sample of a solution of AlBr3 was diluted with water to 23 mL. A 15 mL sample of the dilute solution was found to contain 0.045 moles of Br-. What was the concentration of AlBr3 in the original undiluted solution? answer is 2.09 but i cant get it.
*February 16, 2012*

**chemistry**

. A 13 mL sample of a solution of AlBr3 was diluted with water to 56 mL. A 25 mL sample of the dilute solution was found to contain 2.21 M Br-. What was the concentration of AlBr3 in the original undiluted solution?
*February 16, 2012*

**chemistry**

How many milliliters of a 155 mL solution of 1.7 M AlCl3 must be used to make 70 mL of a solution that has a concentration of 0.21 M Cl-?
*February 16, 2012*

**chemistry**

describe how to prepare a .50 m solution of lead nitrate using only 100.00 mls of water. aslo discribe how to prepare a .50m sloution of sodium iodide using only 100.00 mls of water. explain the differences that exist between these two solutions. OK i have answers for both 1....
*February 15, 2012*

**6th grade math**

A stray dog ate 12 of your muffins.That was 3/10 of all of them! with how many did you start???
*February 13, 2012*

**6th grade math**

can someone please explain to me what the Answer is and also can someone please explain to me how to slove this question step by step??? Please??!!
*February 13, 2012*

**6th grade math**

If the weight of a package is multiplied by 5/7 the result is 40.5 pounds.Find the weight of the package.
*February 13, 2012*

**6th grade math**

thank you
*February 13, 2012*

**6th grade math**

can someone please help me with this question?And can someone also teach me step by step how to solve this question???Please???
*February 13, 2012*

**6th grade math**

your mother gave you $13.32 with which to buy a present.This covered 3/5 of the cost.how much did the present cost? can someone please help me and also show me how to solve this?
*February 13, 2012*

**6th grade science**

thank you soooo much!!!!:)
*February 12, 2012*

**6th grade science**

please???I am in a big time rush!!! please!!!
*February 12, 2012*

**6th grade science**

can someone please help me with this!!! please...
*February 12, 2012*

**6th grade science**

why would a shredded carrot turn the softest when it is sitting on top of a table out in the open air compared to the carrot in water and the carrot in salty water?
*February 12, 2012*

**Calculus (Antiderivatives)**

ok im sorry :(
*February 11, 2012*

**Calculus (Antiderivatives)**

no idea
*February 11, 2012*

**cells**

please????
*February 11, 2012*

**cells**

can someone please help me??? I really have no idea what the answer is!!!
*February 11, 2012*