Tuesday

February 21, 2017
Number of results: 129,321

**Math CONTINUATION OF QUESTION FROM bobpursley**

Thank you for answering the question before bobpursley, I understand how you did the deriv of inside, outside, but how do I now do the second derivative since you have the extra -18x^2 in the numerator?? Thank you very much! (I suppose I have to brush up on my derivatives) ...

*March 10, 2011 by KIKSY*

**Science-bobpursley**

Thanks for helping me with al those parts bobpursley. If you have time, can you also check my questions please. Thank you very, very much in return. My post is on the second page.

*April 6, 2010 by Sara*

**physics-bobpursley/drwls please check**

bobpursley/ drwls please help me with my post on Sunday, April 15 at 10:16pm and 10:19pm. Thanks!

*April 16, 2007 by Mary*

**Math**

Thank you Bobpursley

*September 10, 2009 by Sam*

**algebra 2**

How is this problem done? IF f(x)=2x^2-8x-3 FIND f(-2) algebra 2 - bobpursley, Saturday, January 16, 2010 at 1:42pm Put in for x the value -2, and compute f(-2) algebra 2 - hellogoodbie, Saturday, January 16, 2010 at 1:47pm so is the answer f=21/2? if that is right, thank you ...

*January 16, 2010 by hellogoodbie*

**algebra 2**

How is this problem done? IF f(x)=2x^2-8x-3 FIND f(-2) algebra 2 - bobpursley, Saturday, January 16, 2010 at 1:42pm Put in for x the value -2, and compute f(-2) algebra 2 - hellogoodbie, Saturday, January 16, 2010 at 1:47pm so is the answer f=21/2? if that is right, thank you ...

*January 16, 2010 by hellogoodbie*

**Reiny or Damon or Bobpursley**

Express the series 11 + 18 + 27 +...+ 171 using sigma notation. Usually you would take 27-18 and that's the step between numbers, right? (I think its the k-value?) But 27-18=9 and 18-11=7. Are we stepping by k+2 here? Like k, k+2 k+4, k+6...? Please help me. I'm not confident ...

*April 27, 2012 by Tabby*

**acceleration estimate(bobpursley)**

Well, bobpursley explained this to me. I didn't understand this well. Since there was an error in the data, I am posting it again t(sec) v(ft/sec) 1 12.2 1.5 13 2 13.4 2.5 13.7 velocity of an object moving along a line at various times. How do I estimate the object's ...

*December 11, 2006 by Jen*

**Physics**

A vertical spring with a spring constant of 450 N/m is mounted on the floor. From directly above the spring, which is unstrained, a 0.30 kg block is dropped from rest. It collides with and sticks to the spring, which is compressed by 3.0 cm in bringing the block to a momentary...

*April 6, 2007 by Mary*

**Chemistry!! - bobpursley please**

Calculate the maximum wavelength of light capable of removing an electron for a hydrogen atom from the energy state characterized by the following when n=4 =__________nm Responses Chemistry!! - bobpursley, Wednesday, October 22, 2008 at 4:05am So the two energy states are n=4 ...

*October 22, 2008 by Giznelbell*

**algebra 2**

Posted by hellogoodbie on Saturday, January 16, 2010 at 3:24pm. Posted by hellogoodbie on Saturday, January 16, 2010 at 2:59pm. How is this problem done? IF f(x)=2x^2-8x-3 FIND f(-2) algebra 2 - bobpursley, Saturday, January 16, 2010 at 1:42pm Put in for x the value -2, and ...

*January 16, 2010 by hellogoodbie*

**physics repost bobpursley**

The energy given off by 300 grams of an alloy as it cools through 50°C raises the temperature of 300 grams of water from 30°C to 40°C. The specific heat of the alloy (in cal/g C ) is: i know Q=CpM(delta T) but what is what? Responses * physics - bobpursley, Monday, June 22...

*June 22, 2009 by jane*

**physic please check answers test tommoro**

bobpursley did i do the math problem right if not could u do it for me .thanke

*June 4, 2012 by lisa*

**math**

bobpursley, I am confused to the equations that you have just posted. However, this is what I figured out but I'm not if it's correct. ((25+R)-B)+3N=435

*October 1, 2009 by abby*

**eth**

how do you think slavery influenced the evolution of both black and white america today? is there any websites that might help me with this question? As I was starting to answer your question, I had a conversation with BobPursley. He has summed this answer up better than I ...

*September 12, 2006 by jenny*

**Math**

can you help me with the homework that I am doing right now that is math 4th grade work.Also I need the answers 16/36 We can help, but we wont provide answers. You have to work for them. bobpursley on Tuesday, January 16, 2007 at 7:12pm in response to Math.

*January 16, 2007 by Nakia Johnson*

**Physics, still don't get it!**

I'm sorry bobpursley I don't understand your response, please clarify. When an object of mass m1 is hung on a vertical spring and set into vertical simple harmonic motion, its frequency is 12 Hz. When another object of mass m2 is hung on the spring along with m1, the frequency...

*April 6, 2007 by Mary*

**5th Grade math**

To: bobpursley - how do you teach a 5th grader how to figure out the answer?

*August 31, 2012 by Sky*

**bobpursley**

thank you. :)

*January 1, 2007 by jasmine20*

**bobpursley, math,correction**

Let n be a postive integer, then n+1 is the next integer. sum the squares of those noumbers: n^2 + n^2 + 2n +1=85 solve for n. so this is what i did. n^2+2n+1=85 n^2+2n=85-1 n^2+2n=84 n=7056+4n

*January 26, 2007 by Jasmine20*

**TO BOBPURSLEY**

CAN YOU HELP ME IN ETHNICS

*November 2, 2006 by MINEMINE*

**physics**

thank you bobpursley

*September 21, 2010 by john*

**to bobpursley**

thank you so much!

*April 18, 2012 by Celest*

**Math+ confused?!**

I had to solve for this: 1) choose 4 people from a class of 12 My answer: n=12 r=4 12C4 = 495 2) chosse 8 people from a class of 12 my answer: n=12 r=8 12C8 = 495 why is it that they both eqaul 495? maybe I am doing it wrong but I am confused why do they both equal 495? They ...

*May 15, 2007 by Math*

**Chem- bobpursley**

What mass of protons would be required to just neutralize the charge of 1.5 g of electrons? my teacher said .0015kg times 1e-/.00091e-27kg times 1pt/1e- times 1.67262e-27 over 1 p chem - bobpursley, Tuesday, September 21, 2010 at 6:48pm That is what I would do also. But I ...

*September 21, 2010 by Sara*

**chemistry-mostly for bobpursley- I have a question**

ok i made a post with this question earlier: A carbon nucleus has six protons and six neutrons. How many electrons would it take to equal the mass of a carbon nucleus? u responded with this formula: 6*massproton+6*masscarbon=n*masselectron look up the three masses, solve for n...

*September 20, 2010 by Sarah*

**computer keyboard**

What does this ^ symbol mean in algebra or basic math. It means an exponent follows: 2^3 means two cubed, or 2*2*2 or 8. Thankyou Bobpursley

*July 26, 2006 by Tammy Evert*

**bobpursley**

Thank You very much.

*March 28, 2008 by Ella*

**TO BOBPURSLEY**

I have responded

*September 13, 2009 by AP Physics B*

**Honors Chem B**

Thank you bobpursley!

*September 1, 2011 by Deahna*

**to bobpursley**

is this the correct answer: 2m^-8n^-2/9m^2n^-6??

*September 8, 2013 by Sophie*

**To : bobpursley**

Please could you help me on my question:)

*October 1, 2014 by Rain*

**bobpursley: math cont**

find the equation (in slope intercept form) the line passing through the points with the given coordinate (-1,-1) (-3,-3) ok slope 1 y+3=1(x-(-3) y+3=1x-3 -3 -3 y=x-6.. correct?

*February 23, 2010 by jerson*

**algebra 2**

Posted by hellogoodbie on Saturday, January 16, 2010 at 2:59pm. How is this problem done? IF f(x)=2x^2-8x-3 FIND f(-2) algebra 2 - bobpursley, Saturday, January 16, 2010 at 1:42pm Put in for x the value -2, and compute f(-2) algebra 2 - hellogoodbie, Saturday, January 16, 2010...

*January 16, 2010 by hellogoodbie*

**math**

Sorry my mistake. i had typed up the wrong question mr.bobpursley. What I meant to say was 66 2/3% of ____ = 74. I still can't understand how to figure this out? It is done exactly as I stated. I changed 66 2/3 percent to a fraction 2/3.

*February 21, 2007 by shivangi*

**bobpursley**

I revised my answers below. Thank you

*April 6, 2008 by Jon*

**english**

bobpursley, but can you give me an example

*February 21, 2010 by Ruth*

**bobpursley**

Can you please answer my last post? Thanks -MC

*March 20, 2010 by mysterychicken*

**child care**

thanks bobpursley ok 6 is not b so i think is a? and 20 if its 25-30% its b?

*December 13, 2010 by tiffany*

**Mr. bobpursley**

Thank you for your time and frankness. I agree with you.

*September 4, 2011 by Ben*

**math**

I posted this question yesterday and I got a response that is correct but I still don't understand how he got it. What did he do with the 2? how do i find the slope of the curve at the indicated point? f(x)= absolute value of x, x=2 math - bobpursley, Wednesday, September 16, ...

*September 17, 2009 by joclyn*

**Math**

Help me Bobpursley is dumb Serge invests $700 at 5.75% per year, compounded quarterly. When the account is closed, its value will be $950. How long will Serge’s money be invested?

*January 12, 2017 by Peter*

**BOBPURSLEY LOOK AT MY OTHER ?I REPLIED**

yeah

*January 28, 2007 by margie*

**Thanks BobPursley!**

Thank you so much for all of your help! I understand now!!! : )

*February 1, 2007 by Milford*

**science (bobpursley)**

what about flooding? is that one.

*October 10, 2008 by scooby91320002*

**Physics**

bobpursley can you show the equasions you are using

*January 8, 2012 by Rick*

**Algebra 2 ..........BOBPURSLEY**

SO IF Y=0 what would x be on the graph. Please.. i do not get this...

*January 26, 2013 by Anonymous*

**Physics**

bobpursley, is answering questions on this all you do?

*December 6, 2014 by Dave*

**Bobpursley**

Look at my problem again please thanks

*February 5, 2015 by Bill*

**msg bobpursley**

thanks for your help on the newspaper question.it was a really big help

*October 11, 2008 by nathan*

**bobpursley**

ok and for this other question could you check my work please! h t t p : / /i 3 4 . t i n y p i c . c o m / s 2 z h m v . j p g

*October 15, 2008 by Claudia*

**Bobpursley plz help**

Can you please check my answers 3. Tx=2x+1,XW=x+7;TW Tx+XW=TW 2x+1+x+7+TW 3x+1+7=TW Answer: 3x+8+TW 4. WX=X+5,TW=4x+5;TX WX+TW=TX x+5+4x+5=TX 5x+5+5=TX 5x+10=TX

*August 24, 2009 by Chrissy*

**Earht Science**

To bobpursley, the half life is 40.(potassium 40)

*May 9, 2012 by Christine*

**to: bobpursley**

please help me with the last question, are the others all correct?

*September 8, 2013 by Sophie*

**MATH PLEASE HELP SUE**

# Math - bobpursley, Monday, September 14, 2009 at 5:24pm The base of the rectangle can go from 3 to 22 along the base. 3x22 4x21 5x20 6x19 ... 22x3 Ok, looks like to me it is 22-2 ways. # Math - Van , Monday, September 14, 2009 at 5:31pm sorry... i don't understand

*September 14, 2009 by i need help !*

**To: bobpursley or any math helper**

please help me on my questions, I have a big test tomorrow and I don't understand how to do some questions, please help me

*September 11, 2013 by Sophie*

**Art. bobpursley**

Thanks Bob, your answer made sense. x Nao x

*September 7, 2006 by Anonymous*

**Please bobpursley help.algebra 2**

This is a critical question.. Why does y=3 represent a function and x=3 does not

*August 27, 2007 by logan*

**for bobpursley please check**

ok So The American Association of Labor legislation did what then n

*January 20, 2008 by Michalea*

**blood ex.**

Can you be more specific, bobpursley? I researched hydrogenase and Im not sure what to do...

*November 17, 2008 by VICTOR*

**BobPursley**

h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 7 9 9 0 5 6 1 4 well it's on this page just CTRL+F Kate you can post here if you want thanks!

*July 23, 2010 by Kate*

**Math**

I am still confused! Equation: C1V1=C2V2 Given: C1= 15 mM V1=? C2= 0.25 mM V2= 1mL (Do I just plug 1mL into the equation or do I have to convert to liter? Does mM mean mmol/1L?) I got ~17 microliter. Note: I must convert my answer to microliter. Math - bobpursley, Saturday, ...

*January 15, 2017 by Vivian*

**math 117 for bobpursley**

How about this one can you help me out on it?? 5*square root of 4 + 10*square root of 4

*February 23, 2011 by Tracy*

**Physics Help me Someone plz**

If a galaxy is traveling away from us at 2.0% of the speed of light, roughly how far away is it? t= light years I got 2.4x10^8 light years but its wrong please help me out...thank you Physics Plz help me - Anon, Monday, May 6, 2013 at 9:17pm 5.98x10^6 Thatz still wrong Physics...

*May 7, 2013 by Leila*

**Bobpursley+Chemistry**

Hey Can you take a look at my previous post that you replied on.

*January 14, 2009 by Chopsticks*

**bobpursley**

like what are the steps to getting into a hospital is what prehospital means

*April 1, 2010 by jerson*

**Algebra(repost of one question)**

Bobpursley: 89. Solve for x in the equation: (6/7)x - 6 = -2 I got x=28/3

*May 1, 2010 by y912f*

**BOBPURSLEY PLZ FINISH HELPIN ME W/MY OTHER PROBLEM**

BASICALLY WHAT THE TITLE SAYS!

*November 6, 2006 by SANDRO!*

**bobpursley**

ok heres my work for one of the questions. sorry is taking long to upload them. h t t p : / / i 3 7 . t i n y p i c . c o m / 2 n k 4 9 7 c . j p g

*October 15, 2008 by Claudia*

**bobpursley**

2 3/5 = 6c 13/5= 6 You said to divide both sides by six can you show me an example please? Thanks!

*January 12, 2009 by Payge*

**come back bobpursley**

i'm hoping you have my answer - i'm still working on it though

*March 15, 2009 by jesse*

**algebra**

For this problem a/a-1- a-1/a=4 . Is the answer a=1 1/2. I solved it by multiplying a(a-1) both side as suggested by bobpursley. thanks

*August 30, 2009 by Brian*

**chemistry**

Sorry bobpursley for the multi post< i kept posting it wrong. thanks for yur help

*October 6, 2009 by Tierney*

**Science (bobpursley)**

Why is an extra day added to February every four years?

*May 14, 2013 by Anonymous*

**Physics-bobpursley please check**

This is the question I posted about two hours ago and I worked it out two ways-could you scroll down and check it, please?If I have a roller coaster, and hill 1 height is 50cm and hill height 2 is 25 cm and the PE is .9 as it approaches the top of hill 2, how do I calculate ...

*November 4, 2010 by Joey*

**Question For Bobpursley!**

Can you give me some examples for how to solve quadratic equations? It would really help!

*April 1, 2009 by Cody*

**bobpursley**

Can you please answer my post? I haven't been getting mine answered lately... Thanks -MC

*March 23, 2010 by mysterychicken*

**Caclulus, bobpursley HELP!**

Sorry for bothering you on this one question but I just replied to my original problem if you could help me with that.

*September 21, 2010 by Leanna*

**algebra**

This is a response to bobpursley's answer of Pr(0) = .3; Pr(1) = 7*.3; Pr(2) = 7*.7. Can you show me how you arrived at the above answers? Also, what does * mean? Thanks.

*January 2, 2011 by bree*

**Geometric Series (bobpursley)**

Could you please check my same post again, I had another question.

*September 19, 2011 by Anonymous*

**to bobpursley**

if i was going on the same web you gave me and i wanted to study there,but if its a different book, what do i type in?

*May 3, 2012 by Celest*

**PHYSICS, still cant get it**

A man (weighing 915 N) stands on a long railroad flatcar (weighing 2805 N) as it rolls at 18.0 m/s in the positive direction of an x axis, with negligible friction. Then the man runs along the flatcar in the negative x direction at 40.00 m/s relative to the flatcar. What is ...

*February 27, 2007 by COFFEE*

**physics- response to bobpursley**

which is false? Consider the following processes: I. Energy flows as heat from a hot object to a colder object II. Work is done on a system and an equivalent amount of energy is rejected as heat by the system III. Energy is absorbed as heat by a system and an equivalent amount...

*June 24, 2009 by matt*

**to bobpursley**

In my heads/tails question- why isn't it 1/6? I flip a coin three times, aren't there only 6 possible outcomes?

*December 1, 2009 by Brian*

**To: bobpursley**

Can you please check my other science posts as well. They are still on the 1st page, thank you very much:-)

*April 8, 2010 by Sara*

**math correctionplz**

can someone correct these also for me.. Which of the following is not a polynomial? a) 24 b) 4x^3+5x-1 c)2x-(1)/(x) d)3xy^2+xy MY answer is: A Simplify. write your answer with only positive exponents (y^5)/(y^10) Possible answers: a)y^2 b)(1)/(y^2) c)(1)/(y^5) d) y^5 My answer...

*February 27, 2007 by jas20*

**math**

your basement has an 8 3/12 foot ceiling.To the nearest half foot,how tall is the tallest cabinet that can fit in the basement. it doesn't say how tall and wide the door bobpursley.

*January 26, 2010 by Anonymous*

**math**

your basement has an 8 3/12 foot ceiling.To the nearest half foot,how tall is the tallest cabinet that can fit in the basement. it doesn't say how tall and wide the door bobpursley.

*January 26, 2010 by helpppp me!*

**math**

Is this the correct answer? PV=-50,000+180,000/1+r+180,000/1+r squared=250,000 Responses math - bobpursley, Monday, April 6, 2009 at 12:38pm does r have a value? math - anonymous, Monday, April 6, 2009 at 12:48pm oh yes, r=20%

*April 6, 2009 by anonymous*

**physics Again**

bobpursley can you please check my reply to your post about my question? I am not sure if I did my equation correctly. Thanks

*September 12, 2007 by Haley*

**bobpursley!**

Sorry again but I have two questions. Is this right? 1/5 m= 22 final answer m= 11/55. Seconde how would I do 2/3c = 5.9 Thank you so much!

*January 12, 2009 by Payge*

**physics**

Bobpursley; you helped me with my question and I am a little stuck how would I find distance if I don't know time and vice versa?

*October 6, 2011 by Anonymous*

**bobpursley**

write the equation of the ellipse with foci at (0, -sqrt3) and (0, sqrt 3) and for which 2a=4 i've done this befoe, but with squareroots as endpoints. and if 2a=4, a=2, right? Please help me.

*April 20, 2012 by Tabby*

**to bobpursley**

I don't understand any of the information you gave me to solve the problem. Ok, write the two equations ( I did one). Now graph them. Where do they cross?

*December 10, 2006 by Joeis*

**bobpursly**

Ok so I am still coming up with problems is it possible for bobpursley to answer this: why does Centripetal force increase with frequency, and same with radius? Thanks for the help

*October 2, 2007 by Amandamac*

**bobpursley -science**

sorry my question is explain simply why aluminium is cheaper than gold with reference with the reactivity series. thanks again for your help

*September 27, 2010 by Helena*****

**Math (is this right bobpursley)**

147.5/1000= 0.1475 86.5/1000= 0.0865 Therefore 0.1475 x 0.0865 =0.0128m^2

*August 3, 2009 by Keisha*

**SAT score**

bobpursley you were right. i had gotten my scores by email in exactly 21 days, but i hadn't checked it. i got a 1570

*November 3, 2009 by y912f*

**Science (bobpursley)**

Does mass increase or decrease when the distance stays the same and the force of gravity between two objects decreases?

*May 15, 2013 by Anonymous*

**Physics- drwls please check**

Good morning. This is a repost. The system is telling me my calculations is incorrect. I thought a fresh pair of eyes would help. Suppose a monatomic ideal gas is contained within a vertical cylinder that is fitted with a movable piston. The piston is frictionless and has a ...

*April 19, 2007 by Mary*