Thursday

September 18, 2014

September 18, 2014

Number of results: 491

**Reiny or Damon or Bobpursley **

Express the series 11 + 18 + 27 +...+ 171 using sigma notation. Usually you would take 27-18 and thats 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*

**THANKS FOR YOUR HELP DAMON AND REINY!! :)**

thanks alot!
*May 8, 2008 by Miley*

**Calc and Physics**

Damon and Reiny. Thanks for your quick and thorough responses.
*December 16, 2012 by Daryl*

**Reiny+Damon**

Can you reply to my last math+log post =) thanks. I'm going to be having alot of math questions today.
*February 23, 2009 by Chopsticks*

**Math-Can you help me Damon or Reiny?**

Consider the Venn diagram below. The numbers in the regions of the circle indicate the number of items that belong to that region. (2 intersecting circles A & B, where A part is 50, B part is 110, and the intersecting part is 40) Determine: n(A) n(B) P(A) P(B) P(A|B) P(B|A)
*July 28, 2011 by Jen*

**To Reiny**

Reiny could you please check my Calculus post below, it says Calculus--Reiny.
*October 4, 2011 by -Untamed-*

**grammar damon be clearr**

damon can you be more clear please.
*June 14, 2009 by alley*

**Trig - Thanks Damon**

Thanks for the help Damon. Much appreciated. Don
*December 17, 2011 by Don*

**Math (Reiny??)**

Mrs. Reiny ... As in Harris County Mrs. Reiny?
*April 26, 2011 by sa*

**trigonometry**

Find the distance using the appropriate arch length. A television tower 520m high subtends an angle of 2deg30'. How far away is the tower? some people that helped me alot were Reiny, Damon, bobpursley, and drwls..so i just wanna say thnks to you guys...are u guys math expersts...
*January 16, 2009 by y912f*

**Reiny Or Damon?**

Thanks for reading this! A triangular prism has vertices at A(2,-1,-1) B(2,1,4) C(2,2,-1) D(-1,-1,-1) E(-1,1,4), and F(-1,2,-1)? This question has two parts: 1 - Which image point has the coordinates (-3,2,1) after a translation using the vector <-5,1,3> I'm thinking it'...
*April 26, 2012 by For Reiny*

**Reiny Damon Bobpursley?**

Thanks for reading this! A triangular prism has vertices at A(2,-1,-1) B(2,1,4) C(2,2,-1) D(-1,-1,-1) E(-1,1,4), and F(-1,2,-1)? This question has two parts: 1 - Which image point has the coordinates (-3,2,1) after a translation using the vector <-5,1,3> I'm thinking it'...
*April 27, 2012 by Tabby*

**Damon, Still need your help please tho**

Divide. (25x^2 - 40x + 18) div. (5x - 3) 5x - 5 - 3/5x - 3 5x - 8 - 18/5x - 3 5x - 5 + 3/5x - 3 5x - 14 ~~~~~~~~~~~~~~~~~~~~~ 7x- 14 ------- x - 2 x 7; where x =/ 7 7; where x =/ 2 0 7(x-2)or 7 Damon please
*June 13, 2014 by This Girl*

**question repost damon**

Since some tutors dont check back, i want to repost this to damon: what percent more than 1/3 is 3/5? It said 3/5 was wrong, and I tried but i don't know what happend
*September 12, 2014 by Bobby*

**Damon**

I have a question for Damon. Thank you for answering my question although you lost me when you came up with 37153 instead of 27153. Was this a typo or am I missing sonthing? IF anyone else can tell me I would like the help.
*December 20, 2009 by Rich*

**Reiny+ In need of help**

Hey Reiny, could you please take a look at my expo growth and decay post? Thanks alot.
*March 2, 2009 by Chopsticks*

**physics question for damon (a clarification)**

Hi Damon! You helped me out in this question yesterday (jiskha. com /display.cgi?id = 1395185605) and I was wondering why you added gravity when calculating the friction. Thanks for your help!
*March 19, 2014 by gzag*

**math (last question #5) @Damon**

5. (2y 1)(4y 3) (1 point) 2y + 3 8y^2 10y 3 8y^2 10y + 3 8y^2 2y + 3 i did the rest (#1 and #3) but im stuck on #5, can u help Damon? thanx
*May 21, 2014 by zumai*

**Reiny**

Reiny I think I have found out the rectangle problem. Could you check and see if Ive got it correct?
*January 19, 2011 by Sydney*

**Reiny! Reiny! Reiny!**

1. Oanh walked from her home to the grocery store at 3 mi/h and jogged home at 6 mi/h. Her total round trip was 15 minutes (1/4h). How far from Oanh's home is the grocery store? (use an equation to solve this) Help, I am totally clueless on this.
*February 5, 2009 by Ellen*

**reiny**

reiny why are you so smart thanks for aswering my question
*July 25, 2012 by amira*

**MRS.SUE READ !!!(@DAMON)**

MRS.SUE REMEMBER THAT SOCIAL STUDIES TEST ABOUT MEXICO YOU HELPED ME WITH??? I PASSED 18/18!!!!!!!!!!!!!!!!!!!!!! I LOVE YOU !!!!!!! AND THE REST OF YOU TEACHER !!!!!!!!!!!!!! @DAMON THANK YOU ALL !!!!!!!!!!!! IM RECOMENDING THIS SITE TO EVERYONE !!!!!!!!
*March 6, 2014 by matt*

**reiny**

How do I find a variance for a set of numbers {1,16,8,17,12} I got that variance-34.2, but I'm unsure. Any help? Thanks. math - Reiny, Sunday, January 24, 2010 at 8:16pm look at his page. Reiny - April, Sunday, January 24, 2010 at 8:25pm I looked at that page and did my ...
*January 24, 2010 by April*

**TO REINY **

Hi reiny i just wanna say thank you for always answering my questions thanks for always helping me <3 thank you may god bless you
*December 5, 2013 by BARBIE LEE *

**reiny**

thanks reiny--but i'm in 6th gr and we r not studying powers..can you help me with a simpler answer without powers?
*November 12, 2009 by jane*

**Calculus--Reiny**

Calculus - Reiny, Friday, December 23, 2011 at 6:59pm I read that as (4a^2-1)/(4a^2-16) * (2-a)/(2a-1) , my brackets are necessary = (2a+1)(2a-1)/( 4(a+2)(a-2) * (2-a)/(2a-1) the (2-a)/(a-2) are opposite, they will give you the -1 so.. = -(2a+1)/(4(a+2)) , again you have to ...
*December 25, 2011 by -Untamed-*

**Finance**

Damon Enterprises' stock is currently selling for $25.00 per share. The stock's dividend is projected to increase at a constant rate of 7% per year. The required rate of return on the stock, rs, is 10%. What is Damon's expected price 4 years from today?
*December 19, 2013 by Anonymous*

**History-Civil War**

To:Damon..His little bit of written info really helps me to complete my essays....New question...Was there an opportunity for the confederates to win during any day of Gettysburg? Identify & analyze the opportunity, and show how the South could have won...Have been working on ...
*June 18, 2011 by Joanne*

**Algebra-Reiny please explain this**

Hi Reiny, I posted this problem earlier and you responded but I don't get the reasoning- The problem was -2log8(x+1) = -8 you said multiply by -2 and then you put log8(x+1)=4(wasn't that dividing by -2) log8(x+1)^2 = 8 (how did you get to the power of 2 and =4 became =8 x+1 = ...
*December 13, 2010 by Anna*

**Urgent math question for Reiny**

Find the value of the expression below for r=4 and t=2.... t^3-r+20 divided by r 9*** 72 6 40 Ok, Reiny you said my answer9 was originally wrong, however when I looked at the work you did and you put in parenthesis()....my question is why, because the original expression didn'...
*September 4, 2013 by Gabby*

**to reiny**

Reiny i got (x+5)(x-3) x=-5 or x=3
*December 28, 2008 by kiearra*

**Math thanks, Reiny**

Thanks Reiny!
*September 19, 2009 by Michael*

**math **

Damon has 4 times as many stamps as Julia. Julia has 4 times as many as Claire. Claire has 4 stamps. Write the number of stamps Damon has in both exponetial and standard form. :)
*August 27, 2012 by josiah*

**Craig - baloon - calculus moved up**

Posted by Craig on Tuesday, November 25, 2008 at 7:54pm. t: 0 2 5 7 11 12 r'(t): 5.7 4.0 2.0 1.2 0.6 0.5 The volume of a spherical hot air balloon expands as the air inside the balloon is heated. The radius of the balloon in feet is modeled by a twice-differentiable function ...
*November 26, 2008 by Damon*

**Pre-Calculus - Reiny**

Reiny you helped me with this logarithm yesterday: How did you write it out as log2 ( √A / B^3 ) Laws of logarithms combine, write as a single logarithm Need help on this question please, Im stuck, dont know where to go abouts from here: I did it on paint and uploaded it...
*October 17, 2012 by Shreya*

**URGENT~MATH For Steve or Reiny**

For questions 5-7, find the solution to the system of equations by using either graphing or substitution. 5)y=6-x and y=x-2 (1point) (2,4) (-4,2) (4,2) no solutions 6)y=2x-1 and y=x+3 (1point) (4,7) (7,4) (-7,-4) no solutions 7) y=4x and y+x=5 (1point) (-4,1) (1,4) (-3,2) (2,3...
*May 7, 2013 by Gabby*

**Chemistry Damon step bystep for me**

A 0.887g sample of a mixture of nacl and kcl is dissolved in water and the solution is treated with an excess of agn03 producing 1.822g of agcl. What is the percent by mas of each compound in the mixture My calculation 1.822g/143g/mol = 0.013M x/58 + y/74 (0.887g-x) = 0.013M I...
*January 12, 2014 by Ken Hung*

**British Literature**

What argument does Aphra Behn make about her two loves in the passage: "How strongly does my passion flow, Divided equally 'twixt two? Damon had ne'er subdued my heart, Had not Alexis took his part; Nor could Alexis powerful provce, Without my Damon's aid, to gain my love." Is...
*February 11, 2012 by Scooby10*

**Thank you Jiskha and Reiny**

I just wanted to write a post to thank everyone who helps out. I haven't found people to be very grateful on this site so I thought i'd take a moment to tell you how awesome you guys are. Special thanks to Reiny for all the helpful math tips. You have helped me through a lot ...
*January 17, 2013 by Anonymous*

**Chemistry Damon**

1g of mixture of na2c03 and k2c03 was made upto 250ml is aqueous solution . 25ml of this solution was neutralized 20ml of hcl of unknow concentration. The neutralized solution required 16.24ml of 0.1N AGN03 for precipitation. Calculate a) the k2c03 is mixture b) conc of hcl in...
*January 12, 2014 by Ken Hung*

**Trig**

#1 (1/sinx)(sin^2x + cos^2x(sinx/cosx) )/(sinx + cosx) = (sinx + cosx)/(sinx+cosx) = 1 Reiny helped with this question but I don't how Reiny did it. Please explain
*February 21, 2012 by Anonymous*

**chemistry Damon check my calculation**

25g of a sample of ferrous sulphate was dissolved in water containing dilute h2s04 and the volume made up to one litre. 25ml of this solution required 20ml of this solution required 20ml of n/10 kmn04 solution for complete oxidation. Calculate the percentage of f2s047h20 in ...
*January 4, 2014 by Fai*

**damon (: !**

4. -3x > -6 or x - 5 < 2 5. x - 2 > 2x + 1 or 10 > -2x + 2
*June 16, 2008 by margie (:*

**Reiny! Reiny! Reiny! Answer Check and HW Help!**

Translate to a system of equations and solve: 1) The sum of two numbers is 36. One number is 2 more than the other. Find the numbers. Answer: (17,19) 2) Find two numbers whose sum is 66 and whose difference is 18. Answer: (37,29) These ones I am not sure of: 3) The difference ...
*February 12, 2009 by Britney*

**Trig.......**

I need to prove that the following is true. Thanks (2tanx /1-tan^x)+(1/2cos^2x-1)= (cosx+sinx)/(cosx - sinx) and thanks ........... check your typing. I tried 30, the two sides are not equal, they differ by 1 oh , thank you Mr Reiny I'll tell my teacher this Question is Wrong...
*April 18, 2007 by abdo*

**damon please help (: !**

1. 2x > -6 and x - 4 < 3 2. x + 3 > 2x + 1 and -4x < -8 3. -6 < x + 3 < 6 4. -3x > -6 or x - 5 < 2 5. x - 2 > 2x + 1 or 10 > -2x + 2
*June 16, 2008 by margie (:*

**to Damon**

thanks ayways!
*April 25, 2012 by Celest*

**to Damon**

is the answers 3 and 3?
*June 6, 2012 by Celest*

**Steve - Damon is not sure!**

Steve, I am not sure about this: http://www.jiskha.com/display.cgi?id=1390496194 Damon
*January 23, 2014 by Damon*

**Physics-Please check**

I posted this question this morning but I'm not sure of the response Damon provided. If you were in a rotor style ride and the riders accelerate until the speed of ride is reached- if the radius of the cylinder is 5.0m and the coefficient of friction between clothes and wall ...
*December 7, 2010 by Joey*

**QUESTION FOR DAMON**

y=2SQRT(x-1)
*January 9, 2009 by Mike*

**TO; Damon**

Thank you for the gravity answer 78.4m
*January 25, 2012 by TO : Damon*

**Math**

Damon, how did you get your answer?
*January 26, 2012 by Maya*

**Physics-Please check answer**

Damon helped me with this calc but I think the answer should be -20, not -22, could someone please check the calculation If a ball is thrown into the wall at 14 m/s and comes off at 6 m/s, what is change of velocity of the ball? I think it would be 14-6 = (-8 m/s) Is that ...
*January 5, 2011 by Russ*

**algebra**

Damon, the problem in the book is 5/8*t + 2/15*t = 17/20
*February 21, 2008 by katherine*

**Trig - Thanks Damon and Lindsey**

Thanks a bunch
*December 20, 2011 by Don*

**math**

Posted by connie on Monday, July 20, 2009 at 11:56pm. Find the indicated outputs for f(x) = 2x-4x f(0)= ____? f(-1) =____? f(2) =____? Responses math - Reiny, Tuesday, July 21, 2009 at 8:00am f(0) = 2(0)^2 - 4(0) = 0*0 = 0 f(-1) = 2(-1)^2 - 4(-1) = 2(1) + 4 = 2 + 4 = 6 now ...
*July 21, 2009 by connie*

**S.S (DAMON)**

can anyone explain the advantages and disadvantages for interdependence
*March 13, 2014 by dalia*

**algebra/Steve or Damon help**

find the following if x =x^2+2 f(3/2) 4.24 f(b) 0 did I do this right Thank you
*June 11, 2014 by Mary Ann*

**this math tho (Damon or Steve)**

5/sqrt of 30 how do I solv this?
*June 13, 2014 by This Girl*

**Damon**

thankyou so much for your help. it really helped me . thanks for taking the time to help.!
*December 13, 2008 by Charlotte*

**Math-Damon help please :(**

Let U = {0, 1, 2, 3, 4, 5,...}, A = {1, 2, 3, 4,...}, B = {4, 8, 12, 16,...}, and C = {2, 4, 6, 8,...}. Determine the following: A′ ∩ C
*July 6, 2011 by Jen*

**To: Damon**

Please help me on 1 more question, I posted it with my previous questions. Thanks:)
*January 23, 2014 by Miley*

**To:Damon**

You didn't help on the second question I asked so I posted it again, please help thanks:)
*January 23, 2014 by Raksha *

**Math**

To Reiny: Hi, thank you for your time Reiny and your info. I am so sorry but on the first one I accidentally put 0 where I should have put =9. In other words, the first equation should have said (9n+1)squared =9. Really sorry to have taken up your time with the wrong equation...
*November 3, 2013 by Brandi*

**Chemistry Damon step by step for me**

you are given a solid that is a mixture of na2s04 and k2s04. A 0.215g sample of the mixture is dissolved in water. An excess of an aqueous solution of bacl2 is added. The bas04 that is formed is filtered, dried and weighed. Its mass is 0.299g. What mass of s04 ion is in the ...
*January 12, 2014 by Ken Hung*

**Damon**

Thank you so much for all the calculus help! I felt more prepared for the exam!
*November 5, 2008 by Samantha*

**Physics - Damon**

Hey Damon, I posted this question a while back and you helped me figure out the first part of it. Assume that radio waves have a frequency of 6.0 10^7 Hz, and that the radio receiver is 25 m above the surface of the sea. What is the smallest angle theta above the horizon ...
*January 28, 2009 by Sam*

**Physics**

posted this question this morning but I'm not sure of the response Damon provided. I did it once but then I updated it later in this at the bottom- please check booth of my answers. If you were in a rotor style ride and the riders accelerate until the speed of ride is reached...
*December 7, 2010 by Joey*

**probability**

Reiny, thanks!
*September 24, 2011 by dee*

**ThankYou Reiny!!!**

Thank you!
*January 29, 2012 by Betty*

**Maths**

Thanks Mr Reiny
*May 12, 2013 by Gibbs*

**Algebra 1 (Reiny)**

1. t^-6 for t = 2 A: 1/64?
*January 31, 2014 by Anonymous*

**Algebra 1 (Reiny)**

1. ((d + 2)/(d + 8)) = ((-6)/(d + 8)) A: ? 2. 4/n^2 = 7/n + 2 A: n = -4 or n = 1/2? 3. 2/t + 4/3t = 4/t + 2 A: t = 10? 4. ((x -6)/(x^2-6)) = ((-4)/(x-4)) A: ?
*June 3, 2014 by Victoria*

**damon (: !**

anyway i can give you my email or myspace in case i ever ned help again ? (:
*June 16, 2008 by margie (:*

**help me Damon!! :)**

Determine whether the pairs of sets are equal, equivalent, both, or neither. A = {7, 9, 10}, B = {a, b, c}
*July 6, 2011 by Jen*

**to Damon**

thanks.its okay. wanna be friends?we can talk to eachother online here.im available from 4:00 to 10:00. what grade are you in?
*April 25, 2012 by Celest*

**algebra**

Thank you Poppy and Reiny!!!!!!!!!!!! :)
*May 5, 2010 by paul*

**Algebra 1 (Reiny)**

12a - 11 = 9a - 1?
*October 7, 2013 by Anonymous*

**Algebra 1 (Reiny)**

Is -1/64 the answer to 2x^0y^-3?
*January 18, 2014 by Anonymous*

**History-Civil War**

To - Damon....any comments on the question I posted on 07-10-11 @ 9:48 pm. I always appreciate your remarks...they help
*July 11, 2011 by Joanne*

**Earth Science to DAmon**

Give positive and negative effects of climate change in Canada..
*December 17, 2012 by lg*

**Tricky Math tho (Damon)**

Divide. (25x^2 - 40x + 18) div. (5x - 3) need to know how to solve this
*June 13, 2014 by This Girl*

**Reiny**

Can u answer my last alg post?
*February 2, 2009 by Chopsticks*

**Algebra 2**

Thanks Reiny How ado I simplify? (3i5)^
*April 1, 2010 by dan*

**For Reiny**

If you could go back and check my reply to you. thanks
*September 5, 2012 by Vanilla Bear*

**To reiny**

hi do you have a facebook account ?
*December 10, 2013 by Joy*

**Algebra 1 (Reiny)**

Simplify. y^10/y My answer: 1.
*February 3, 2014 by Anonymous*

**Algebra 1 (Reiny)**

Simplify each expression. 1. (8/27)^1/3 2. (8/27)^2/3
*February 7, 2014 by Anonymous*

**Cal 1**

How do you find dy/dx by implicit differentiation? x^3 + y^5 = 1 Damon answer isn't right and I have no idea what he did. Somebody please help.
*November 6, 2010 by Anyomous*

**Reiny**

Can you check back at my last post again? Thanks.
*March 2, 2009 by Chopsticks*

**Math Reiny**

AmI doing this right? Multiply (a+1/2)(a+1/3) a^2+1/6
*September 24, 2010 by Sabrina*

**Algebra 1 (Reiny or Kuai)**

How do I graph y = -x squared + 5?
*November 4, 2013 by Anonymous*

**Mathematics (Reiny or Ms. Sue or Kuai)**

What is 1 divided by 1/7?
*November 13, 2013 by Anonymous*

**To: Reiny**

Please help me on my question, no one helped me...
*January 23, 2014 by Raksha *

**Stoichiometry Test**

Thanks Damon i got a couple more lolz 2.Determine the formula mass of (NH4)2C4H4O6
*February 12, 2009 by Cool Dom*

**physics**

Just wanted to say a quick thanks to Steve and Damon, figured it all out, thanks guys, awsome!!!
*April 12, 2013 by Chad*

**Geometry**

Damon, can I write it like that instead of a two column proof. I am comparing a bicycle and a model of one?
*August 5, 2014 by Jan*

**Chemistry**

.50 - x / x = 3.20e-1 I need to solve for x. I was going to do .50 X 3.20e-1 and then take the square root but this is not correct. I am not sure what to do. Thank you for your help. Math(Please help) - Reiny, Tuesday, April 17, 2012 at 3:18pm You probably meant (.50 - x)/x...
*April 23, 2012 by Hannah*

**drwls & Damon - maths**

hey guys, i follow you up to the point of intergrating the final line. How would I intergrate [x^-2.e^-x] dx thx
*December 29, 2007 by xX_Supaman_Xx*

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