Monday

April 21, 2014

April 21, 2014

Number of results: 9,733

**trig-reply to Reiny**

I'm new to this. I didn't know you could reply to the original post? (testing with this reply), otherwise I would not have kept re-posting as a 'new' question. I just noticed some replies as I was reading other questions. again, my apologies. I feel like I should change my ...
*Monday, January 3, 2011 at 8:36pm by Carol*

**trig-reply to Reiny**

It's actually the end of an integration problem from a college calc text I have from 1971. The problem involved Weierstrass Substitution. The part I posted was after converting from the u-substition to an answer in terms of x. The orig prob. is integrate (cos x )/(3 cos^2 x - ...
*Monday, January 3, 2011 at 8:36pm by Carol*

**trig-reply to Reiny**

sorry for the late thank you!! I lost the post and couldn't find it. doubt you will see this, and I didn't want to clog up the page with a new post. you're the greatest!!
*Monday, January 3, 2011 at 8:36pm by Carol*

**trig-reply to Reiny**

Since we did not resolve your question, I am curious where you got this problem. Is it from a textbook? Is in an assignment problem? Just curious, since it obviously not a true statement.
*Monday, January 3, 2011 at 8:36pm by Reiny*

**For Reiny**

If you could go back and check my reply to you. thanks
*Wednesday, September 5, 2012 at 10:53pm by Vanilla Bear*

**trig-reply to Reiny**

RE: (- sin (x/2) /( 2 sin (x/2) + cos (x/2)) is an alternate representation for, 1 / ( 4 tan (x/2) + 2 ) Thanks for your help, sorry I posted 3 times, I thought you didn't understand what I needed. I really do appreciate your time spent. just for your FYI, if you are ...
*Monday, January 3, 2011 at 8:36pm by Carol*

**trig**

The landlubber textbook writer means a "heading", not "bearing". Heading is the direction your vehicle is pointing. Bearing is the direction you measure toward a target from the vehicle. If the target is straight ahead, then the bearing is the heading. If the target is off to ...
*Sunday, October 5, 2008 at 10:54pm by Damon*

**Reiny+Damon**

Can you reply to my last math+log post =) thanks. I'm going to be having alot of math questions today.
*Monday, February 23, 2009 at 5:24pm by Chopsticks*

**math statistics**

thanks reiny for the quick reply and i think ive gotten the correct answer for part B came out to be .53 but i try to do the similar things for C) and D) and it's not working.
*Tuesday, September 22, 2009 at 1:09pm by aaron still stuck on question c and d*

**trig**

Reiny's right -.-
*Wednesday, April 7, 2010 at 12:36pm by Houdini*

**Reiny! Reiny! Reiny!**

Wait, I don't get it. I solved 3t = 6 (1/4 - t) and got 11.66666666666.... and then what do I do? ..or did I do that wrong?
*Thursday, February 5, 2009 at 12:12am by Joy*

**Trig.**

Thank you, Reiny! It helped me a lot.
*Friday, April 30, 2010 at 6:40pm by Shayla*

**trig**

Thanks Reiny. it was simpl right?
*Friday, July 29, 2011 at 10:18pm by Sulaksha*

**trig**

yea what reiny said
*Monday, April 30, 2012 at 9:55pm by visoth*

**Trig**

Good job Reiny. Guido
*Friday, February 15, 2008 at 2:23pm by Guido*

**business /computers**

It's a mass email, indeed. It may or may not be considered spam, depending on the content of the email. If your reply pertains to everyone in the list, then you can certainly use REPLY-ALL and it will be sent to everyone in the CC. If you only want to respond to the one who ...
*Saturday, November 1, 2008 at 8:15am by After5PC_dot_net*

**Trig**

whoops, sorry everyone. The original message was supposed to be a reply to another post.
*Wednesday, April 9, 2008 at 10:36am by Dennis*

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

What are the equations for numbers 3 and 4?
*Thursday, February 12, 2009 at 11:36pm by Britney*

**Pre-Cal (verifying trig identities)**

Thanks, Reiny.
*Thursday, February 12, 2009 at 10:04pm by bobpursley*

**trig**

I don't understand how to fnd it though Reiny :( perhaps you could help?
*Monday, April 30, 2012 at 9:15pm by Sam*

**math (trig)**

prove it Reiny :) my way always works
*Monday, February 23, 2009 at 7:58pm by mysterychicken*

**Trig. - Nope**

My bad. Reiny is correct. Can you see my mistake?
*Saturday, April 21, 2012 at 1:36pm by Steve*

**trig-reply to Reiny**

Continued, also this isn't an official assignment. I'm teaching myself calculus. I just love math. I took cal 30 thirty ago but don't remember much. I use Wolframe Alpha to check my answers. here's the web paste without the beg. address part, you'll have to copy and paste. ...
*Monday, January 3, 2011 at 8:36pm by Carol*

**Math - Solving Trig Equations**

Reiny, I was anonymous... my name wasn't filled in. ;)
*Wednesday, November 21, 2007 at 8:23pm by Michael*

**Trig**

ARGHHHHH now that really was a brain fart on my part ... Thanks a lot Reiny for the help Don
*Wednesday, January 4, 2012 at 10:34pm by Don*

**Reiny**

BTW, when you cut-and-pasted some of my previous reply, my square root symbols came out as } Do you see an actual square root symbol in my post above?, I hope so.
*Monday, March 3, 2008 at 2:46pm by Reiny*

**trig**

Solve without using a calculator or tables cos(5pi/6 + pi/4) Thank you Reiny!:)
*Thursday, May 1, 2008 at 5:25pm by Priya*

**Trig**

I'm not sure what your looking for Reiny. It looks like the center of the circle is still (0,4) what am I doing wrong?
*Wednesday, January 4, 2012 at 10:34pm by Don*

**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
*Tuesday, February 21, 2012 at 2:28pm by Anonymous*

**trig-reply to Reiny**

I did manage to cut and paste your link, here is what I found: http://www.wolframalpha.com./input/?i=integrate+%28cos+x++%29%2f%283+cos^2+x+-+5+cos+x+-+4+sin+x+cos+x+%29++dx&asynchronous=pod&s=29&incTime=true I did notice that the equivalence was between -sin(x/2)/(2sin(x/2...
*Monday, January 3, 2011 at 8:36pm by Reiny*

**trig**

Solve the given triginometric equation analytically 7 sinx - 2 = 3(2 - sin x) If your are online, thank you my dear Reiny:) Priya
*Thursday, May 1, 2008 at 7:38pm by Priya*

**To Reiny**

Reiny could you please check my Calculus post below, it says Calculus--Reiny.
*Tuesday, October 4, 2011 at 9:29pm by -Untamed-*

**Math To: Reiny**

(12) (10xy^3) (3x^2y^2) (5x) (2y) = mmmmh = 3600 x^3 y^6 For the next 4, I showed you how to do these. Did you read my reply? [(a^2bc^4)(ab^3c^2)]^2 / (b^2c^5)^3 = [a^3 b^4 c^6]^2 / (b^6 c^15) = (a^6 b^8 c^12) / (b^6 c^15) = a^6 b^2 / c^3
*Wednesday, September 18, 2013 at 10:39pm by Reiny*

**Math To: Reiny**

for this one: 12) (10xy^3) (3x^2y^2) (5x) (2y) I got (12) 18x^2 3y^5 and do you know what 4^-5/2 expressed as a radical with positive exponents would be, I did read your reply but I keep getting those questions wrong so can you please show me how to do them
*Wednesday, September 18, 2013 at 10:39pm by Maya*

**physics - reply is here for asteroid**

This is where I posted the reply to the multiple postings.
*Monday, May 31, 2010 at 1:06pm by Damon*

**reply+chemistry please**

can someone reply to my last chem post
*Wednesday, February 4, 2009 at 12:39am by Chopsticks*

**Reiny please...**

Reiny i still kind of not understand this can you tell me the answers to each one please Reiny.. please....
*Monday, January 6, 2014 at 11:12am by *ajay**

**Math**

FYI Reiny, I didn't see that you had already solved this problem before I answered the same same post below. I noticed are answers were different. The height = diameter, not radius. I am not sure if 'Scratch my reply" means your 1st answer here or your 2nd answer.
*Sunday, February 20, 2011 at 12:25am by Helper*

**Chemistry+Reply**

Can someone reply to my previous post.
*Thursday, January 15, 2009 at 11:12pm by Chopsticks*

**math--To MathMate**

In regards to your reply to the problem that Daniel posted (f'(-pi)). I really appreciate you (and Reiny) taking the time to confirm that my answer was correct. I don't usually answer unless I am absolutely sure an answer is correct (I don't want to give wrong answers to ...
*Friday, February 25, 2011 at 1:26pm by Helper*

**Trig(continued)Reiny**

In that case the solution I just gave you above will be the correct one. Notice that all 3 answers work in your original equation.
*Friday, February 15, 2008 at 12:52pm by Reiny*

**drwls, or other tutors**

does my last postage seem correct for the answers that i got. The one that doesn't have a reply. See previous reply to your post.
*Thursday, March 1, 2007 at 12:01am by jas20*

**trig**

The question still shows up as "18 minutes" on my (Mac) computer but the symbol for degrees appears in Reiny's answer. C'est la vie
*Wednesday, May 28, 2008 at 9:38pm by drwls*

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

3) Answer (12, 28) 4) Answer (4, 22)
*Thursday, February 12, 2009 at 11:36pm by David*

**Algebra 2 to Reiny**

you are correct. You can test whether two trig expressions are equal by taking a non-standard angle, like 37, and evaluating each expression If the question was to "simplify", I would consider the original expression simplified enough. Because of the many trig identities and ...
*Friday, June 11, 2010 at 12:03am by Reiny*

**Math (Reiny??)**

Mrs. Reiny ... As in Harris County Mrs. Reiny?
*Tuesday, April 26, 2011 at 9:48pm by sa*

**trig**

Solve the given triginometric equation analytically. Use values of x for 0 less than or equal to x less than 2pi P.S Thanks Reiny for your last post, if you are still online.
*Thursday, May 1, 2008 at 4:31pm by Priya*

**Math .. Please help Reiny**

Yayyy.. Reiny to the rescue!!! Truely appreciat your help. Thanks!!
*Thursday, November 29, 2012 at 7:04pm by Sunshine*

**Math**

whoever Reiny is really explained that well and now i am done with my homework,THANKS Reiny! :)
*Wednesday, March 3, 2010 at 12:01am by bobby*

**Urgent math question for Reiny**

P.S. I'm not saying Reiny is wrong I'm asking so in the future I can know why.
*Wednesday, September 4, 2013 at 11:22am by Gabby*

**More Math for Reiny or Steve or Ms.Sue...**

Ok uhhh maybe Reiny...
*Friday, September 20, 2013 at 11:22pm by Gabby*

**Math (Reiny)**

Keira, you really need to learn to spell Reiny's name correctly!!
*Saturday, June 27, 2009 at 11:33am by Writeacher*

**algebra 1 - go with Reiny**

Take Reiny's analysis. He paid a bit more attention to the details than did I.
*Friday, January 18, 2013 at 11:17am by Steve*

**Algebra-Reiny please explain this**

Reiny, thank you-I get it now thanks again
*Monday, December 13, 2010 at 10:31pm by Anna*

**Algebra II**

I made a math error on the second one. I can't even punch a calculator anymore. Go with Reiny's answer. On the first problem, I assumed your first equation was correctly typed. If the minus sign should not have been in front of x^4, as Reiny assumed, you get an easly factored ...
*Saturday, February 23, 2008 at 5:11pm by drwls*

**Jiskha**

Jiskha homework help rocks. But I need someone to reply to my post: social studies!!!! -afton PLEASE REPLY!!!!!!!!!!! 10/9 - 9:21 pm
*Monday, October 9, 2006 at 10:21pm by Anonymous*

**Reiny+ In need of help**

Hey Reiny, could you please take a look at my expo growth and decay post? Thanks alot.
*Monday, March 2, 2009 at 12:29am by Chopsticks*

**Pre-algebra !!**

Thanks Reiny, I wasn't reading the question right! Sorry, Ashley, please go with Reiny's answer.
*Monday, May 23, 2011 at 8:14pm by MathMate*

**Johnnie Read My Reply - algebra**

Did you not read my reply?? I solved your question by factoring at 9:54
*Monday, May 17, 2010 at 9:43pm by Reiny*

**MS.Reiny and Sue**

thank you reiny for helping me and my causins were useing my computer for help on there math homework also!!! so thank you from all of us
*Sunday, January 4, 2009 at 3:10pm by kiearra*

**Reiny**

Reiny I think I have found out the rectangle problem. Could you check and see if Ive got it correct?
*Wednesday, January 19, 2011 at 9:16pm by Sydney*

**math-calculus**

thanks jordan and reiny :) but reiny i not understand the whole absolute value thing becuase for -|-sqrt81| you get -9 and that not positive.
*Tuesday, January 10, 2012 at 8:31pm by Shreya*

**Trig(continued)Reiny**

my question is sin 2 = cos NOT sin2 = cos . I'm sorry, I didn't understand your question earlier.
*Friday, February 15, 2008 at 12:52pm by Jon*

**Math 112 Help please**

Hey Reiny Thanks for your respond, Damon you and Reiny are on the same track. I'll keeping working on this,. I think I keep missing something. Thanks
*Sunday, April 14, 2013 at 9:26am by Enis*

**Math (Reiny)**

Reiny, Thank you so very much!!!
*Wednesday, January 5, 2011 at 9:44pm by Ann*

**reiny**

reiny why are you so smart thanks for aswering my question
*Wednesday, July 25, 2012 at 9:43pm by amira*

**Algebra 1 Answer Check (Reiny)**

Reiny?
*Monday, December 2, 2013 at 3:04pm by Anonymous*

**chemistry+reply**

can someone reply to my previous chemistry thread please?
*Wednesday, January 21, 2009 at 6:56pm by Chopsticks*

**german**

I apologize for my delay in answering, and am glad that my answers agree with Reiny. It took me four hours to get my wife to help me; by then Reiny had posted his answer already.
*Wednesday, December 30, 2009 at 7:16pm by drwls*

**question for Reiny**

Reiny, I know that my presentation is poor form. I only know how to work this in MS Word the right way. Is my answer supposed to d=sqrt 34 or d=5.83?
*Tuesday, June 8, 2010 at 8:31pm by bart*

**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.
*Thursday, February 5, 2009 at 12:12am by Ellen*

**trig**

These questions you are posting now are very similar to the ones you posted yesterday around 11:00 am I answered several of them for you then. You did not reply to any of my posts, so I have no indication that you even looked at them. Post your answers and I will check them. ...
*Thursday, February 2, 2012 at 7:06am by Reiny*

**math (final trig problem)**

Solve for x on the interval [0,π/2): cos^3(2x) + 3cos^2(2x) + 3cos(2x) = 4 I havent done trig for a while so what exactly does that mean in solving for x on that interval and how would i go about doing that? Where are you getting these tough trig questions?? how about ...
*Monday, April 30, 2007 at 10:33pm by jacob*

**geometry**

Since my numbers don't agree with Reiny's, check mine for mistakes. Reiny is right about there being two cases. I assumed all acute angles
*Wednesday, June 9, 2010 at 8:55am by drwls*

**PLEASE REPLY**

I don't know physics ... but I know you must wait for a physics teacher to come online. Posting under PLEASE REPLY will get you nowhere.
*Friday, May 17, 2013 at 8:01pm by Writeacher*

**Reiny! Reiny! Reiny!**

let her time walking be t hours then the distance she walked = 3t miles let her time jogging back home be 1/4 - t hours so the distance she jogged = 6(1/4 - t) but aren't those two distances the same ? so... 3t = 6(1/4 - t) I am sure you can solve this for t, then sub that ...
*Thursday, February 5, 2009 at 12:12am by Reiny*

**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
*Thursday, December 5, 2013 at 5:09am by BARBIE LEE *

**Math**

Yes, Reiny answer's is correct. I went back to redo the question and got the same answer as Reiny. Sorry for the mistake.
*Friday, February 8, 2008 at 2:24pm by Guido*

**PreCalculus (Reiny please help)**

Make that 42,516.84. There is a formula that could be used, but I don't know it. reiny probably knows the formula.
*Wednesday, April 28, 2010 at 4:43pm by drwls*

**math - go with Reiny**

Go with Reiny's answer. I messed up my log base conversion.
*Tuesday, March 5, 2013 at 10:59pm by Steve*

**thanks Reiny**

Thank you so much Reiny. thanks a lot.
*Sunday, December 15, 2013 at 12:56pm by kavi*

**English**

I am writing a letter, in the closing I wrote, If you reply by [a date].... or If you reply back by [a date].... Is the "back" necessary?
*Tuesday, June 24, 2008 at 3:11pm by Bell*

**mat115**

Sorry Reiny, The question is 11-6/7-7 I thought the answer was 5/0= undefined. Can you please let me know if I am wrong and show the work so I can further understand your answer. Thanks Reiny
*Sunday, August 29, 2010 at 9:59am by charlie*

**Reiny! Reiny! Reiny!**

Oh, i see. thank you.
*Thursday, February 5, 2009 at 12:12am by Joy*

**Reiny please...**

Yes Reiny i was post to hand this in in December but i was sick for lot of days so i couldn't. i have to hand this in tomorrow or my marks will go down. its already down. please help me. i tryed it but i couldn't do these two questions. please Reiny help me please. tell me the...
*Monday, January 6, 2014 at 10:54am by kavi*

**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?
*Thursday, November 12, 2009 at 9:42pm by jane*

**Math Probability**

Thank You, Joe and Reiny for your help. I believe Reiny you use combination formula and I believe you are right, because the question does states that the order doesn't matter. Once again thanks to you both
*Sunday, December 1, 2013 at 8:35pm by Anonymous*

**Trig**

Good comment, Reiny. I generally eschew working on homework dumps, but I have always enjoyed the many ways trig functions can be combined. Some of those tan-sec identities in the previous batch stumped me, though. Today's problems were pretty straightforward. Still, Kewal, it ...
*Thursday, January 12, 2012 at 5:12am by Steve*

**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...
*Wednesday, April 18, 2007 at 2:37pm by abdo*

**analytic geometry**

Yes, I did confuse the vertex with the focus. Thanks to Reiny for catching that. There appears to be a sign error in Reiny's final equation, however. As written, it is the equation of a circle of radius sqrt8. Try instead x^2/8 - y^2/8 = 1
*Tuesday, July 19, 2011 at 11:08pm by drwls*

**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 ...
*Sunday, January 24, 2010 at 8:29pm by April*

**To Ms. Sue (PLEASE read!)**

please reply what i post (To Ms. Sue - Laruen, Sunday, April 22, 2012 at 6:22pm) because you didn't reply it
*Sunday, April 22, 2012 at 9:48pm by Laruen *

**Science 7R - please reply this post **

Please reply this post I want to know if im correct
*Wednesday, January 18, 2012 at 8:30pm by Laruen *

**Trigonometry**

I once had a great geometry teacher back in high school in Seattle. He was old and close to retirement. He used to say, to a mostly bored and unappreciative class: "Try to see the beauty in it." A few of us did. It was my favorite subject. Trig was next. Reiny's proof reminds ...
*Saturday, July 19, 2008 at 1:03am by drwls*

**math**

My bad, Ellie and Reiny, on the second one. My thinker slipped a cog, and I considered y = 1/|11-9x|-6 rather than 1/|11-9x|-6=0. Reiny is correct, of course!
*Tuesday, October 6, 2009 at 12:22am by jim*

**Calc.**

Reiny treats your k as an unknown a + bt parametric term, so there are really two unknowns in that case. I treat k as an unknown constant. In Reiny's czse, solutions can be obtained, as he has done. You should have been clearer about what k is supposed to represent.
*Monday, July 7, 2008 at 9:23pm by drwls*

**To Reiny**

im not really sure how i came up with 31...i think i did 13 + 13 = 26 and then added 5 because all cards that are greater than 9....i see where i messed up....thank you Reiny! i appreciate it :)
*Saturday, July 23, 2011 at 4:13pm by Jen*

**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 = ...
*Monday, December 13, 2010 at 10:31pm by Anna*

**integration math**

Reiny is right...sharpay sweetie you really need to know what your talkin about before you answer someones questions...you dont want people thinking of you as a you know...ditz as i like to say...good luck in life sharpay and keep it up REINY!!
*Monday, April 13, 2009 at 4:01pm by Miss Logan:)*

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

#3: Let the larger be x, the smaller be y <The difference between two numbers is 18> ---> x - y = 16 <Three times the larger number is seven times the smaller> ---> 3x = 7y or 3x-7y = 0 #4 (same way) x - y = 18 3x + 2y = 74
*Thursday, February 12, 2009 at 11:36pm by Reiny*

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