Saturday

October 22, 2016
Number of results: 642

**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*

**physics**

damon,reiny,steve,ms sue.plz get a solution 2 my question please itz urgent!!!

*August 8, 2015 by edward*

**help me damon reiny steve bob plzz**

prove that nsini=constant plz show me solution

*September 26, 2016 by dam*

**pre algebra**

2x^2 + 8 - 4x + 3x - 6x^2 + 7 what does this simplify to A)-8x^2 - 7x + 15 B)-4x^2 - x + 15 C)4x^2 + x + 15 D)8x^2 + 7x + 15 pls help me reiny steve or damon pls help me

*March 23, 2015 by Oscar*

**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*

**sequence help!!!!! plz steve,reiny,damon,bob...anyone!!!!**

find the expression in terms of n of the nth term of following squences 5,13,32,69,129,221....help plz show it work

*March 16, 2016 by emmanuel*

**To Reiny**

Reiny could you please check my Calculus post below, it says Calculus--Reiny.

*October 4, 2011 by -Untamed-*

**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*

**sir-steve or reiny or damon**

just got a little favour to ask plz do u do facebook am just asking if u don't wanna give ur full name to add as friend then is fine by me because you guyz have really added academic sucess in my carreer life plz

*October 3, 2016 by samnuel*

**grammar damon be clearr**

damon can you be more clear please.

*June 14, 2009 by alley*

**Math (Reiny??)**

Mrs. Reiny ... As in Harris County Mrs. Reiny?

*April 26, 2011 by sa*

**damon or reiny need ur help God bless you**

A rectangular face of a casting 250mmx100mm is to be machined on a sharper.if the average cutting speed is to be 20m/mins and the feed is to be 2mm/stroke,calculate the time taken to machine the face of the casting.Allow 5mm overrun at each end of the stroke

*August 9, 2015 by edward*

**Trig - Thanks Damon**

Thanks for the help Damon. Much appreciated. Don

*December 17, 2011 by Don*

**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*

**jiskha**

so im wondering, what time do the main tutors log off of jiskha ? like some main tutors, reiny, damon, steve, ms. sue, and writeacher. i don't see any tutors that are answering the 9 current questions, but i know that writeacher is still on because he/she already answered my ...

*September 7, 2015 by anon*

**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*

**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*

**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*

**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 don't 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*

**reiny**

reiny why are you so smart thanks for aswering my question

*July 25, 2012 by amira*

**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*

**Maths need help trigonomentery**

Two circular flower beds have a combined area of (29₯)/2m^2. The sum of the circumferences of the flower beds is 10₯m. Determine the radius of each bed........ Happy new year to all mrs sue steve,reiny,damon...and to all my jishka helper i need help plz i need it solution don...

*December 31, 2015 by Collins*

**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**

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 *

**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**

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-*

**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*

**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*

**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**

I have got help from Damon on this question but all I need is help on integrating the answer he gave me into my original equation: y=-15/20.25(x+1.5)^2+0 Here's Damon's help: (x+1.5)(x+1.5) = x^2 + 1.5 x + 1.5 x + (1.5*1.5) = x^2 + 3 x + 2.25 So would I put this into my ...

*December 4, 2014 by Alex*

**Math**

have got help from Damon on this question but all I need is help on integrating the answer he gave me into my original equation: y=-15/20.25(x+1.5)^2+0 Here's Damon's help: (x+1.5)(x+1.5) = x^2 + 1.5 x + 1.5 x + (1.5*1.5) = x^2 + 3 x + 2.25 So would I put this into my original...

*December 4, 2014 by Alex*

**Math**

I have got help from Damon on this question but all I need is help on integrating the answer he gave me into my original equation: y=-15/20.25(x+1.5)^2+0 Here's Damon's help: (x+1.5)(x+1.5) = x^2 + 1.5 x + 1.5 x + (1.5*1.5) = x^2 + 3 x + 2.25 So how would I put this into my ...

*December 4, 2014 by Alex*

**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, don't know where to go abouts from here: I did it on paint and uploaded ...

*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*

**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*

**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*

**TO REINY**

Thank you Reiny, Why I have to divide 632/1.05? I was dividing 632/0.05, I need to understand for future similar problems, I really appreciate your help, I finished school almost 30 years ago, I decided to go back to school an obtain a degree, I try my best but so many years ...

*January 25, 2015 by maribel*

**Calc I (@Reiny) **

y = x^3 - 8x^2 + 6x -2 has a slope of 6 at two points, what are the coordinates? I used Reiny's way to help solve this answer. Please check if I've done it correct: y'= 3x^2-16x+6 3x^2-16x+6=6 3x^2-16x=0 x(3x-16)=0 Solve for x's x=0 3x-16=0 ~> x=16/3 Plug x values to ...

*October 10, 2016 by Angie*

**Calc I (@Reiny) **

y = x^3 - 8x^2 + 6x -2 has a slope of 6 at two points, what are the coordinates? I used Reiny's way to help solve this answer. Please check if I've done it correct: y'= 3x^2-16x+6 3x^2-16x+6=6 3x^2-16x=0 x(3x-16)=0 Solve for x's x=0 3x-16=0 ~> x=16/3 Plug x values to ...

*October 10, 2016 by Angie*

**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*

**Math: Reiny **

I already posted this question, and Reiny had a question about the question. How many square units are in the region satisfying the inequalities y>=(x) and y<=-(x)+3? Express your answer as a decimal. * the () are absolute value signs. Math - Reiny, Wednesday, December ...

*December 3, 2014 by Jenny *

**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*

**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*

**Math( Attn: Reiny)**

1. A rental business charges $12 per canoe and averages 36 rentals a day. For every 50-cent increase in rental price, it will lose two rentals a day. What price would yield the maximun revenue? I was told the answer by Reiny, but I couldn't get the right answer. I found the ...

*January 25, 2015 by Wendy*

**DEAR REINY**

dear reiny i am sim who posted 4 questions this morning i am in dubai and my final examinations are after 13 days and by the way those questions were not my homework or assignment those were some sums which we get on our school website and i had a doubt in those questions but ...

*February 13, 2016 by sim*

**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*

**Physics**

Please check my answers!! 1. A 75 kg. man steps off the end of a diving board, and hits the water at 7.7 m/s. Ignoring air resistance, what was the mans PE (potential energy) right before he stepped off the diving board? I got 2223.375 Joules after Damon helped me...am I right...

*February 29, 2016 by Becca*

**Algebra **

I already posted this question and Reiny answered it, I just wanted to clarify my answer Problem: If f(x) is a polynomial of degree 4, and g(x) is a polynomial of degree 2, then what is the degree of polynomial f(x)-g(x)? Reiny: so f(x) has to contain an x^4 term and g(x) does...

*November 12, 2014 by Trish Goal*

**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*

**Gratitude for my helper**

Sir steve mrs reiny sir bobpursely sir damon ms sue..... Thank you very much you guyz have really help me alot today my result came out and i score 98 out of 100 in my maths exams aldo i am still shaking in my english but with the help of ms sue i always read english question ...

*January 6, 2016 by Collins*

**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*

**Damon,steve,reiny,bobpursley....Any 1 just help me plz **

Eight years ago martha was half as old as susan will be when susan is one year older than rose will be at the time when martha will be five times as old as rose will be two year from now. ten years from now rose will be twice as old as susan was when martha was nine times as ...

*April 13, 2016 by samuel!!!*

**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 30Ί, 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 (: !**

4. -3x > -6 or x - 5 < 2 5. x - 2 > 2x + 1 or 10 > -2x + 2

*June 16, 2008 by margie (:*

**Calculus- Damon, Steve, Reiny**

I forgot to mention that I am trying to find sigma squared.. given that the mean is r and p(x)= (1/r)(e^(-x/r)) on the interval [0,infinity), where r>0.. note: sigma squared= integral sign (-inf, inf) (x-M)^2 p(x) dx i got (r^2 - 2r)^(1/2) for sigma, but my answer is wrong...

*November 28, 2015 by Christina*

**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*

**math**

Posted by connie on Monday, July 20, 2009 at 11:56pm. Find the indicated outputs for f(x) = 2x²-4x 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*

**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*

**math101**

need Damon help

*November 10, 2015 by misty*

**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**

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*

**Math**

Mrs. Hart, at age 65, can expect to live for 25 years. If she can invest at 5% per annum compounded monthly, how much does she need now to guarantee herself $900 every month for the next 25 years? math - Reiny, Friday, April 3, 2015 at 3:05pm Present Value = 900(1 - 1.0041666...

*April 3, 2015 by Judy*

**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*

**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**

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 *

**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*

**Math @Reiny**

Did I do #2 right? 2.) (1-2i)/2i (1-2i)/2i = (1-2)/i x i/i = (1i-2i)/i^2 = (1i+2) =2+1i

*October 8, 2014 by Ben*

**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*