Thursday
July 31, 2014

Search: Math-Reiny this one is more confusing to me :(

Number of results: 138,506

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

Math (Reiny??)
Mrs. Reiny ... As in Harris County Mrs. Reiny?
April 26, 2011 by sa

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

Algebra
I have an exponent properties test tomorrow, its our last one before the final, so its important, but anyways, there is one question on the review that is confusing me. Could you please help? Here it is : (2y2x7)(-xy)(9x-3y) I dont know if the exponents showed up, but the ...
January 6, 2011 by Abigail

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

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

Calculus
What is implicit differentiation...as in what would be the steps in solving it. I read my textbook but it seems very confusing. 1) Differentiate both sides with respect to x 2) Realize that y is a function of x 3) Solve for y Plus the d/dx notation made it even more confusing...
November 4, 2009 by Nikita

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

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 (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

Math
Evaluate:|12 5 -2| |-3 0 1| |-5 4 2| It's going to be really confusing if I post my work. I got -127 from all the confusing things I did
February 26, 2008 by Jon

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

Math-Reiny this one is more confusing to me :(
A survey of vegetable gardeners showed the following: 63 grew tomatoes 26 grew cucumbers 38 grew zucchini 18 grew both tomatoes and cucumbers 22 grew both tomatoes and zucchini 19 grew both cucumbers and zucchini 14 grew all three types 18 grew none of these three (a) How many...
July 11, 2011 by Jen

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

Math thanks, Reiny
Thanks Reiny!
September 19, 2009 by Michael

Math
I understand how to do these kind of problems except this one. Write the equation that has the given roots. Roots: 3 with multiplicity of 2, -5, 0 with multiplicity of 4. By the way I understood the help that I got earlier, but this problem seems to be more confusing.
May 13, 2010 by Jennifer

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

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

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

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

algebra
But I am getting more and more confused. -3-3x=-9????? and x/6=-24 but the there is a negative sign like x - - =-24 6 I know I am over thinking this,but I am confusing myself on these two???
August 19, 2013 by jan

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

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-

Reiny!!!! math help
We understand how to do the questions now and we are really glad n thankful, but the graphing portion of it is confusing. Continuation of the function. The teacher wants us to plot the points from the different parts of the questions we answered and with your help we graphed ...
October 9, 2012 by Cole n Cynthia

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

english
how does shifting the point of view [third person to first person] change the effect on the reader It's very confusing. If a story or essay starts out in 3rd person, the reader picks up on that and expects that to continue -- a shift to another POV is confusing and could lead ...
April 16, 2007 by jamey

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

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

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

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

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

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

7th Grade Math
I do know how to find the area of a square and rectangle, but how do you fing the area of a rhombus. (that is at least what it looks like.) The shape I'm talking about is like a rectangle but it looks like one side got stretched to the left. (sorry if I made that even more ...
February 15, 2013 by Jessie

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

math
an estate valued at $62,000 is left by a will as follow:to each of two grandchildren a certain sum,to the son twice as much as to the two grandchildren together,and to the widow $2,000 more than to the son and granchildren together. How much goes to each? I tried by reading ...
September 16, 2010 by Kaylen

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

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

3 grade math ms sue
Name the lengths of the sides of three rectangles with perimeters of 12 units. Use only whole numbers. My son did -2-4-2-4 And one more 1-5-1-5 And one more 3-3-3-3 And I need one more rectangles number how you can make
March 8, 2012 by Dw

math
If it says: "five less than three times a number is 20 More than half a number" would the equation be 3n-5=n/2+20? If so what would the answer be? Please help this is a bit confusing!
January 6, 2014 by jeffery

10th grade math
1.548937075 x 10 to the 12th. round the number to 3 significat figures. I thought I would respost this because the other one was getting confusing
August 19, 2008 by Rebekah

math
This is a confusing problem to me also, can someone please help me? What are the odds in favor of getting at least one head in three successive flips of a coin?
October 9, 2009 by Aleah

dr bob
I am still confused by the last one CO3^2- You were nice enough to do a diagram and then the expalnation for what else I needed to do was so confusing - I am at study hall and this is my last one
December 14, 2007 by sam

Grammar
A simple sentence: A) Can be reversed and still mean the same thing. B) Expresses one complete thought with one subject and one predicate. C) Expresses one or more complete thoughts with one or more subjects and one or more predicates. D) Is easy to understand. My answer is C
December 12, 2012 by Marie

Physics I
I have this vector that is confusing me I know what I need to do but the components of these vectors are confusing me. Problem: You are standing at point with coor dinates (1m, -1m, -2m) another erson is at r(t)=(8m)i - (3m/s^3) t^3 j + (4m/s^2) t^2 k Find distance between you...
March 18, 2011 by David

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

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

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

To reiny: Regarding math question
Would the answer be d then??
April 19, 2009 by Lil Cutie Pie

math..reiny..help!!
is that the area of big or small triangle?
October 25, 2012 by dan

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

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

Chemistry(Please check)
.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 19, 2012 by Hannah

health
Please help as this is so confusing tome! 25. In addition to the nucleus, cytoplasm, and cell membrane, a single neuron possesses A. one dendrite and several axons. B. several dendrites and one axon. C. many nuclei and one neurilemma. D. one nucleus and many neurilemma.
June 28, 2010 by Jackie

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

To Reiny, math helper
can you look at my post, its just 4 math terms I need to figure out, please help
September 18, 2013 by Sonia

math
thanks reiny for the help but can u tell me the domain of f g and fog in binary form? thanks
October 26, 2010 by mary

math (Reiny please)
how would i do these problems: 6. xsquared + 2x -7 =0 7. 6xsquared - 2x -1 = 0
April 9, 2013 by kathy

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

Math
I need to change this number to a percentage, rounded to the nearest tenth. 1350-1010/1010=.336633663 would the answer be 3%? this one is confusing to me for some reason
March 30, 2010 by Amy

Reiny MATH HELP
I think you are a math tutor, could u help me with my problem?
January 11, 2011 by Anonymous

Math - Odds
If you toss three coins, what are the odds in favor of getting exactly two tails and one head? A. 3:8 B. 3:5 C. 5:3 D. 8:3 can you explain this? i can do odds but this is confusing me.
May 28, 2013 by bubbie

math
how are and 3 4th bours and the distance traveled in 2 3 4th hours represented in the table?how are they shown on the graph? Having read the next four or five posts, I suggest you do two things: 1. Start over and write a complete question for each post. Fragments of questions ...
October 2, 2006 by chemiii

math
Thanks for the answer Reiny, could you explain the way you solved the factor of 21y^2+38+5
April 26, 2011 by lori

Math
Reiny can you show me how to check this problem. 5a^8-20a^7-25a^6 =5a^6(a^2-4a-5) =5a^6(a^2-5a+a-5) =5a^6(a(a-5)+1(a-5) =5a^6(a-5)(a+1) (answer)
July 26, 2011 by Ms.Ellis

Math(reiny)
On the earlier questin would the speed be faster not slower?
July 11, 2013 by Scott

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

Morse Code Please Answer!
My book doesn't explain how, for example, if D was --. and O was .-. than how would they tell the end of the D from the beginning of the O? Did they pause between letters? But then how would they know the difference between a "new letter" pause, and a "new word" pause. Could ...
February 22, 2007 by Jenna

Homework
We, my roomates and I, keep getting replies saying stop posting under more than one name. We are not posting under more than one name we are all different. We all live together and only have this common computer at the moment, but we are more than one person and we love this ...
November 12, 2007 by Olivia

math (A question for Reiny)
THANK YOU SO MUCH for the help with magic squares! But I have one quick question- how can I show my work! I have to show my work or I receive like 1/2 credit.
August 25, 2010 by Anonymous

math (Reiny)
If # (a,b,c,d)means you raise b,c and d to the power of a and then take the sum of the resulting values, and # (2,3,4,d)=89,then d=? 2^a + 3^a + 4^a = 89 1^a + 1^a + 1^a = 89 3^a = 89 a = 86 an I do it right
December 19, 2013 by peter

math
you have one penny one nickel one dime and one quarter. how many different amounts of money can you make using one or more of these coins ... please help..me..:(
December 9, 2009 by Katherine

ap biology again
In order to answer a question I must use this information but I find it very confusing. The restriction enzymes of bacteria protect the bacteria from succesful attack by bacteriophages, whose genomes can be degraded by the restriction enzymes. The bacterial genomes are not ...
January 4, 2008 by claudia

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

Biology - fossils
my sister Shreya be sick so i posting her biology questions. one question ask hw did creationists explain fossils. she write this be about noah's flood but what be noah's flood? i look up on internet for her and there be too much confusing words. i only be able to make out ...
March 2, 2012 by Mohammad

Physics
Another one, sorry! =P This stuff is really confusing.. Why doesn't friction depend on surface area?
November 17, 2009 by Cyn

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

math
multiply the equation by a power of 10 to write an equivalent equation with integer coefficients: #1. 4.15x+3.01=10.9x+1.29 #2. 1.596y-3.08=0.9y this is the 2nd time I'm posting this question. but the last reply I got was confusing. can you please show me how to do at least ...
September 21, 2009 by Anonymous

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

Math
Soybean meal is 18% protein, cornmeal is 9% protein. how many pounds of each should be mixed together to get a 360 pound mixture that is 15% protein ? Word problems are my favorites, but this one is confusing me. Help is very much appreciated
July 7, 2010 by Christy

english
Regarding the use of commas, which one of the following statements is accurate? A. A parenthetical use of commas is usually confusing to the reader. B. There is no need for commas that indicate added details in a sentence. C. Commas are needed to separate a list of three or ...
May 2, 2013 by selena

Accounting
How does one determine variance analysis? I am trying to understand this and my text book is confusing me. Also, to determine this, would one find the the answers in the balance sheet or cash flow statement, or from the revenue and expenses?
April 30, 2010 by Barbie

CONFUSING QUESTION PLEASE HELP
Which one of the following species will react with Sn at standard state conditions? a) S b) Ag+ c) Cu d) Zn2+
May 8, 2013 by scilover

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

math
reiny, could you give the motorists two trips another try. it appears you can work it . i'd appriciate seeing an answer. thanks.
July 22, 2011 by mac

Algebra 1 (Math) for Steve or Reiny
1) Which method would be the simplest way to solve the system? 7x+5y=19 -7x-2y=-16 (1 point) Graphing*** Substitution Elimination Distributive 2) What is the solution of the system? 7x+5y=19 -7x-2y=-16 (1 point) (2,1) (1,2)*** (7,5) (-7,-2) 3) Which method would be the ...
December 11, 2013 by Gabby

Science
A student observed two different types of cells under a microscope. She noticed that one cell had many more mitochondria than the other. What can the student predict about the cell with more mitochondria? A. The cell produces more waste. B. The cell makes more proteins. C. The...
February 27, 2012 by Kate

Math
3) Find the area bounded by the curves f(x)= x^3 + x^2 and g(x)= 2x^2 + 2x. I get 4653pi/105 after help from Mr. Reiny, but this is wrong. Have I calculated incorrectly? Thank you
May 22, 2013 by Hannah

math
you are planning to open a candy stand with your friends. you will need to buy 20 candy bars at a wholesale cost of $.30 each. you will need to buy 15 lollipops at a cost of $.05 each. How much money will you spend ALL TOGETHER? its pretty confusing :( and this one: for a ...
May 22, 2014 by triganle

So confusing! Help Math.
49x-2 = 7 7 a. -5/4 b.5/4 c. 11/4 d. -11/4
May 21, 2013 by Holly

factoring
let f(m)=m^3 + 3m^2 + 3m + 1 notice f(-1) = 0, so m+1 is a factor. Using division, the answer is m^2 + 2m + 1 which factors once more to (m+1)(m+1) so you have (m+1)^3 = 0 and then m = -1 Are you familiar with Pascal's triangle? Did you notice the pattern in the coefficients 1...
March 11, 2007 by Reiny

math logic
I need to find 5 or more ordered pairs (x,y) In which xy = x + y like (0,0) and (2,2) 0,0 2,2 1/2,-1 -1,1/2 i need one more How about two different x's and y''s? (2,3) = 1,5) this is the problem: xy= x+y or the product of xy equals the sum of x and y. example: x= .5 and y= -1 ...
December 3, 2006 by steph

More Math for Reiny or Steve or Ms.Sue...
1) Is (0,3) a solution to the equation y=x+3? (1point) Yes*** No 2) Is (1,-4) a solution to the equation y=-2x? (1point) Yes No*** 3) Look at the following points. (4,0), (3,-1), (6,3), (2, -4) Which are solutions to y=x-4? Choose all correct answers. (2points) (6,3) (4,0...
September 20, 2013 by Gabby

Math
If REINY was reading story problems and if he did not know the algorithm steps to share to a simple problem, would he have time to be sarcastic?
January 29, 2012 by john

algebra need help soon
I have been working on these 2 problems and I think I am confusing myself. I have never tried this site before but it was recommended to me. I appreciate whoever can help me. Thanks in advance The first question is f(x)=-2x^2 + 2x + 8 I need to find the x and y coordinates of ...
May 8, 2009 by ayanna

algebra urgently need help
I have been working on these 2 problems and I think I am confusing myself. I have never tried this site before but it was recommended to me. I appreciate whoever can help me. Thanks in advance The first question is f(x)=-2x^2 + 2x + 8 I need to find the x and y coordinates of ...
May 10, 2009 by krystal

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

math
how do u solve x+3=0? its very confusing.
February 12, 2009 by Jessica

Math Pattern Help
Math Pattern Help - TO: Reiny, Monday, February 13, 2012 at 10:35pm Based on what you said this is what I came up with. Did I do the rest of the pattern correctly? Thank you so much for your help. X y 1 9 2 8 3 7 4 6 8 2 10 0 12 -2 15 -5 20 -10
February 13, 2012 by TO: Reiny

Math
solve: 4u^2 + 3 = -7u The sqrt part is confusing me.
July 4, 2010 by Hannah

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