Friday

September 4, 2015
Number of results: 51,759

**To: Reiny**

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

**Algebra 2 to Reiny**

in the one you helped me with, where did this come from: Where did this part come from? - (sin^2 + cos^2)
*June 9, 2010 by Ana*

**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*

**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*

**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*

**To Reiny**

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

**Happy mother's day**

To Ms Sue and Ms Reiny, who have helped me with homework questions in the past Happy mother's day. To all the other tutor's who are also mother's that have not helped me yet, happy mother's day to you too. Enjoy!
*May 12, 2013 by B6*

**to REINY**

you have been of much help tonight, I truly appreciate that. I can also, honestly, say that I can retrace my steps and explain how I arrived at the answer after your detailed explanations. Thank you very much. Hope to one day help someone as you have helped me (maybe in ...
*January 23, 2014 by Andy G*

**English**

1. I have helped an old man to cross the street on a crosswalk. 2. I have helped a foreigner to find a post office. 3. I have helped a missing child to go back to his home. 4. I have helped an old lady to carry things. 5. I have helped a man to take a highway. 6. I have helped...
*September 15, 2012 by rfvv*

**Math (Reiny??)**

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

**college algebra--Please help Reiny please**

You helped me with this question and this is what I got but my Professor says that each x and y intercept needs to have a coordinate. Where did I go wrong?? Can you help me? x^2+y^2+4x+2y-20=0 x^2+4x+4+y^2-2y+1=20+4+1 (x+2)^2+(y+1)^2=25--this is where you helped me. Then I ...
*October 26, 2012 by ladybug*

**English**

1. I have helped an elementary school student to cross a street. 2. I have helped an old man to find a drug store. 3. I have helped an old lady to find her daughter's apartment. 4. I have helped a blind man to buy things at a supermarket. 5. I have helped a drowning boy to ...
*September 10, 2012 by rfvv*

**Math Reiny question**

This is the problem you helped me with. I was curious, do I write the solution set as (1 + i33)/2, (1-i33)/2 change it to the standard form first x^2 - x + 7 = 0 a=1, b=-1, c = 7 x = (1 } (1 - 4(1)(7))/2 = (1 } -27)/2 Your answer is an imaginary number or called a ...
*September 24, 2010 by Sabrina*

**Math clarification Reiny**

This is the problem you helped me with. I was curious, do I write the solution set as (1 + i33)/2, (1-i33)/2 change it to the standard form first x^2 - x + 7 = 0 a=1, b=-1, c = 7 x = (1 } (1 - 4(1)(7))/2 = (1 } -27)/2 Your answer is an imaginary number or called a ...
*September 25, 2010 by Sabrina*

**English**

1. I have helped an old lady carry a big bag. 2. I have helped an elderly person cross a street. 3. I helped a foreigner find a subway station. 4. I have helped an Englishman go to a police station. 5. I have helped a stranger find a bookstore. 6. I have helped a Japanese find...
*October 24, 2010 by rfvv*

**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*

**reiny**

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

**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*

**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*

**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-*

**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*

**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*

**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*

**English**

1. I like taking walks. 2. I like taking a walk. (Which one is OK? Are both right?) 3. You should obey the school rules. 4. You should keep the school rules. 5. You should follow the school rules. (Are all the same?) 6. He helped Mother who was sick in bed. 7. He helped to ...
*June 7, 2009 by John*

**Reiny (this was the one you helped me with)**

I tried to explain it by using the arrangement of billiard balls, but I guess you don't play pool. let me try to "draw" the billiard balls . . .o . . o o . .o o o . o o o o o o o o o o sum of one row = 1 sum of two rows = 3 sum of three rows = 6 sum of four rows = 10 sum of ...
*June 27, 2009 by Keira*

**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*

**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*

**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 *

**math**

how I change 28/9 to a mixed or whole number divide 28 by 9 to give you 3 with a remainder of 1. so 28/9 = 3 1/9 (three and one ninth) Thank you Reiny
*March 12, 2007 by carmen*

**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*

**Pre-Algebra [repost for Reiny]**

In my last post for #1, I asked my teacher and she said that it's actually k=30 . Could you have gone wrong somewhere? That's the only one. -MC
*May 1, 2009 by mysterychicken*

**English**

I helped my mother wash the dishes. I helped my mother clean the house. I helped my mother ironing some clothes. I vacuumed the floor. I cleaned the floor with a mop. I cleaned the study which was messy. I cleaned the veranda where there were a lot of items such as books, ...
*July 16, 2012 by rfvv*

**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*

**German help - Reiny**

#3 was supposed to be.... Mutters und Vaters Kinder sind A. meine Cousins B. mein Geschwister C. meine Schler. D. meine Geschwister.***** This is the one I typed wrong last night - sorry about that...not sure on this one but I chose D....? Thanks for your help
*February 13, 2014 by Cassie*

**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*

**math/science**

thanks any one that helped!!!
*June 4, 2011 by who wants 2 no?*

**MATH (to Reiny)**

I tried to simplify it with the second fraction by multiplying the top and bottom by "r" and i didn't work. Well at least I don't understand how to get there. Can you please just explain how... n!r/(n-r-1)!(r-1)!r goes to n!r/(n-r+1)!r! I get one put of it, that r x (r-1)! = r...
*March 4, 2009 by Alex*

**English**

1. Mother Teresa helped many people in India. (In this sentence, what is the part of speech of 'in India?' Is it an adverbial phrase modifying 'helped' or is it an adjective phrase which modifies 'people?') 2. You watched The Matrix yesterday. 3. You watched the Matrix ...
*November 3, 2009 by rfvv*

**7th grade-Algebra Worth Problem**

Please show equation and solve for the following 1. Lyn's age is 8 years less than 15 times the age of her niece Elizabeth. If the sum of their ages is 24, what is Elizabeth's age ( Let e= Elizabeth's age) 2. Bob is renting a canoe for $20, plus $9.75 per day. How mant days ...
*September 23, 2009 by DMAR*

**Algebra II**

I solved one of these sigma notations and had Reiny check it in an earlier post but this one totally befuddles me- Which of the following terms would not be in the series generated by the expression: 5 Signma symbol (k^2-5k+2) k=2 the choices are 2, -2, 4 or -4If you could ...
*December 5, 2011 by Julia*

**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*

**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*

**Writeacher**

Thank you soooo much. you have helped me so much since yesterday, i really appreciate it especially since you helped me removew my doubtings. Again thank you.
*January 22, 2012 by sandy*

**Pre Calc (For Reiny)**

Thanks so much your method worked perfectly! My solution was: the remaining zeros were 5+2i, 3, and -4 I have one question that's bugging me though, why is it that synthetic division did not work for me? I thought that long division and synthetic division were both ...
*November 15, 2009 by Zach*

**world history**

What helped unite Charlemagne's empire? answer A strong efficient government helped unite Charlemangne's empire
*December 9, 2011 by mike *

**Social Studies**

In what ways has Americas geography helped to bring Americans together? In what ways has it helped to separate Americans?
*October 27, 2008 by Nicole*

**social studies**

Sorry to keep posting, I thought I had this one figured out, however it is the last one that I have. She helped to end the Bourbon Triumvirate and pushed for Women Rights Hints - 13 letters - ends with an t _ n
*March 22, 2009 by Stephanie*

**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*

**to Reiny**

-5 = x - 3(x+4) 3(x+4) = x+5 square both sides 9(x+4) = x^2 + 10x + 25 x^2 + x - 11 = 0 solving this by the quadratic formula gave me x = (-1 }45)/2 or appr. 2.854 or -3.854 how did u go from line one to line 2
*May 26, 2009 by to Reiny*

**help me!**

In what ways has Americas geography helped to bring Americans together? In what ways has it helped to separate Americans?
*October 27, 2008 by someone*

**Social studies**

1.What was the most important factor leading to the end of the Cold War? a)The European Economic Community formed b)Democratic revolutions began in Eastern Europe c)The Marshall Plan helped rebuild Western Europe d)a U.S.-soviet peace treaty helped repair relations.***
*April 7, 2015 by #HOMEWORK*

**To All Students & Tutors**

I will not be able to answer any questions on this board for the next 8 days or so. I will be warming my weary bones down south off one of the islands of Belize for a while. Great time to get away as the temperature up my way is currently at -12 C. Reiny
*January 6, 2010 by Reiny*

**ELA**

The meaning of this sentence can be improved by adding which phrase to the end of (20)? (19)Sometimes, the Coffins helped the travelers disguise themselves by putting on elegant clothing.(20)Other people helped. A.by staying away B.by doing useful things C.from time to time D....
*March 7, 2012 by running.from.myself*

**Social Studies**

What characteristic did the Mauryan and Mughal empires share? -Both helped spread Buddhism -Both helped spread Islam -Both embraced the idea of religious tolerance -Both were begun by Aryan people
*April 12, 2014 by Jack*

**English**

Where does the apostrophe go or is one needed? This parks rules were hard to understand? The rangers instructions helped.
*May 12, 2015 by Kelley*

**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*

**math**

collected for use in the approval process required by the U.S. Food and Drug Administration (FDA). Some participants were given a placebo, an inert substance that looks like the drug; others were given the drug. The data are shown in the following table: No Help Help Drug 22 ...
*March 30, 2010 by Hannah*

**math**

collected for use in the approval process required by the U.S. Food and Drug Administration (FDA). Some participants were given a placebo, an inert substance that looks like the drug; others were given the drug. The data are shown in the following table: No Help Help Drug 22 ...
*March 30, 2010 by Hannah*

**Social Studies**

What characteristic did the Mauryan and Mughal empires share? a.Both helped spread Buddhism. b.Both helped spread Islam. c.Both embraced the idea of religious tolerance. d.Both were begun by Aryan people I think either a or d Help?
*March 19, 2015 by chloe*

**None of my questions are being answered**

I need serious help for the questions i put on here and no one is helping me? ive tried using different names, subjects and said please and thank you and no one has yet helped me. I'm not impressed by this. Thanks but no thanks for the help. Jake/cabe/eliza
*November 1, 2011 by Jake/cabe/eliza*

**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*

**Math**

In the tests of a new pharmaceutical product, data was collected for use in the approval process requied by the U.S. FDA. Some participants were given a placebo, an inert substance that looks like the drug; others were given the drug. The data is shown: No Help Help Drug 22 47...
*August 3, 2009 by B.B.*

**Geography (Ms. Sue)**

1). What helped the economy of the West to grow? My answer: The West's growth in the 20th century was helped by air conditioning and by irrigation. I am aware that you have already explained that my answer was correct, yet incomplete. However, in what manner is it? Should I ...
*September 12, 2013 by Anonymous*

**ELA**

Which of the following is the best way to rewrite this? F.Sometimes the Coffins helped disguise themselves by putting elegant clothing on the travelers. G.The Coffins sometimes helped themselves by disguising the travelers in elegant clothing. H.Sometimes the Coffins helped ...
*March 7, 2012 by running.from.myself*

**SS**

What changes did the Aryan migration bring to India? (1 point) The Aryans brought Islam to the region of South Asia. The Aryans developed the Mughal Empire. The Aryans established the caste system and helped develop Hinduism. The Aryans helped spread Buddhism throughout the ...
*April 22, 2015 by Kareemah*

**biology**

can you give examples of analogous structures????? please i have tried about 4 differet websites and no one has helped
*November 14, 2013 by raylynn*

**geometry**

In the tests of a new pharmaceutical product, data were collected for use in the approval process required by the U.S. Food and Drug Administration (FDA). Some participants were given a placebo, an inert substance that looks like the drug; others were given the drug. The data ...
*March 17, 2010 by dic*

**Math**

In the tests of a new pharmaceutical product, data were collected for use in the approval process required by theU.S. Food and Drug Administration (FDA). Some participants were given a placebo, an inert substance that looks like the drug; others were given the drug. The data ...
*June 17, 2010 by Anonymous*

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

thanks alot!
*May 8, 2008 by Miley*

**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*

**math help**

Thank you for helping me with the last problem Reiny and Bosnian. However, I have one more problem that I need help with please and I have no idea how work the problem. I used an on line calculator to get the answer. It didn't give an explanation on how to do the problem ...
*April 23, 2012 by Urgent Urgent Please*

**dr. bob**

can you help me with the ones you helped me with last nite? lower on page one i put my results i got down for you to see if i am even close
*November 18, 2007 by mel*

**Pre-Algebra**

Victoria you helped me with the last problem can you help me again with this one please? 26cm/s=m/min. Convert this using the dimensional analysis.Thank-you.kj
*January 1, 2011 by kj*

**Math**

Dear Reiny! U r a life-saver! Is there a short cut to how can I set the question or change word problems into math one? It seems that this is my problem! Also, why did my way worked as well with different answers? My answers satisfied all equations as well. Many thanks.
*April 9, 2010 by Me*

**Math**

i did the other one but can someone help me with this one: Four = fifths of the sum of a number and three is equal to six and a half. What is the number? also ms. sue deleting my question was not very nice because it took me forever to type it and if you didn't know it then ...
*March 26, 2013 by Ryley*

**Math (need more help Reiny)**

Ok i figured out the first part that i need to square the numbers so after 4 it will be 5x5,6x6,7x7,8x8and 20x20 to make up the second column, what i dont get is the 3rd one, how do i come up with the number of white triangular shapes used?
*June 25, 2009 by Keira*

**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*

**algebra**

thank everyone that site helped but now i just have to practice. for now can someone tell me how does 3x=7-4x x=1 which one do you minus or subtract from the equation? 3x = 7 - 4x The first thing you need to do is get the unknowns on one side of the equation. You also need to ...
*August 1, 2007 by chrissy*

**math**

sam chovell is a private detective working in the Bay area. One month he helped the police to solve five mysteries
*November 30, 2011 by mike*

**eth**

What information about race and ethnicity in the United States has helped me better understand or relate to specific minority groups? Have you learned something new about your own cultural history? I am sure the teacher wants YOUR opinion and not mine. So just think about how ...
*September 24, 2006 by nicole*