Tuesday

October 21, 2014

October 21, 2014

Number of results: 80,767

**To Reiny**

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

**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*

**College Algebra**

Solve the following equation in the complex number system x^4+x^3+4x^2+10x-60=0 College Algebra - Reiny, Monday, January 2, 2012 at 11:49pm hint x = 2 and x = -3 are roots so either do long division by x-2 and x+3 to get a quadratic or do it by synthetic division. Solve that ...
*January 3, 2012 by Jennifer*

**Algebra 2 ..**

Reiny,why do you have to answers in the promvlem 5x^2...................please look back....
*December 27, 2012 by Anonymous*

**Algebra 2 (Reiny) **

How am I supposed to compress f(x) = |2x| - 3 vertically by a factor of 1/4? Please, will you explain this to me?
*October 11, 2014 by Victoria*

**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*

**Algebra**

Hello Reiny, please check these problems for me and if they are not right WOULD YOU PLEASE HELP ME WITH THE CORRECT ONES THANKS!!! 1. Slove for X, wher X is the real number, square root 5x + 9= square root 9x + 13= 27 2. Find the value: ^3 square root -27= 9 3. Write the ...
*October 31, 2010 by lee*

**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*

**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-Can you please check this Reiny**

Can you check this: x^-3y^2/x^2y^-4 I think the answer is y^6/x^5 Thanks for explaining the other problem
*October 6, 2010 by DeAnne *

**college algebra, Please help!!**

find the f and g, so that fOg= H H(x)=sqrt x^2+17 please show work
*November 27, 2012 by Heather*

**college algebra, Please help!!**

solve the following equation 9^x-1 = 144(6x) please show work.
*November 28, 2012 by confused*

**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*

**college algebra--need help please!!**

find the domain of the composite function fog. f(x)= 2/x-3; g(x)= 7/x please show all work.
*November 24, 2012 by Heather*

**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*

**Please Reiny Solve it For me Again! please......**

Solve for the value of x: log5(x-2)+log8(x-4)=Log6(x-1)..For your information that 5,8 and 6 are bases not just multipliers. Thank you.
*April 10, 2013 by Seth*

**college algebra--please**

I am not understanding this question and I have read the chapter many times. Please help. given the function of f(x)=4x-8 a. find the the rate of change between the stated values for x:5 to 7 b. find the equation of a secant line containing the given points (5,f(5)), and (7,f(...
*November 2, 2012 by ladybug*

**College Algebra **

Write the following a+bi form i(3.14-3i) Please help. I believe that the answer is 3.14i-3i, which would be (3.13*-1)-3*-1. however this was incorrect please tell me where I went wrong
*May 28, 2014 by Anonymous*

**algebra 1**

Reiny I posted a question earlier (about 3:00) and I have a question about your solution. How did you get -4x? I came up with -8x which does not allow for anymore reduction. Please let me know how you did it. Thanks!
*March 9, 2009 by Dippy*

**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*

**college algebra--need help Please!!!**

I need to find the vertex and axis of symmetry of the folowing quadratic function. Can someone PLEASE help me!! y= -x^2-6x
*November 12, 2012 by ladybug*

**To: Reiny**

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

**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*

**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*

**college algebra, Please help!!**

use the intermediate value theorem to show that the polynomial function has a zero in the given interval. f(x)=4x^3+3x^2-8x+7;[-5,-2] please show all work
*November 18, 2012 by ladybug*

**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*

**Reiny**

can you look at my posts when you come to this page please.
*August 24, 2007 by Marissa*

**To Reiny**

Can you please help me with those problems i answered you back thanks! :)
*July 23, 2011 by Jen*

**Algebra-Mathmate or Reiny or Dr. Bob, please check**

I have two short questions which I think I know the answer-could you please check? If I write log(b)x - 2log(b)y as a single logarithm it would be log(b) x/y^2, correct? If not please help and Is the function f(x) = 1/x a exponential function -I think it would be because it ...
*December 14, 2010 by Anna*

**college algebra**

please solve by method of substitution 0.3x-0.4y-0.33=0 0.1x + 0.2y -.21=0 please give all steps to solve.I think I understand the basic concept but this is little more complicated for me. Thanks in advance
*November 24, 2009 by Nadia*

**college algebra**

Can someone please help me find the x-intercepts and y-intecepts of this equation. I have the radius, and center but I can't seem to get the intercepts. x^2+y^2=16x-18y+145=25 Please show work. Thanks!!
*December 4, 2012 by confused*

**math (Reiny please)**

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

**college algebra--need help please!!**

information is given about a polynomial f(x)whose coefficients are real numbers. Find the remaining zeros of f. degree:5, zeros: -6, 6-i please help and show all work.
*November 23, 2012 by ladybug*

**college algebra--need help please!!**

information is given about a polynomial f(x)whose coefficients are real numbers. Find the remaining zeros of f. degree:5, zeros: -6, 6-i please help and show all work.
*November 23, 2012 by ladybug*

**college algebra--need help please!!**

information is given about a polynomial f(x)whose coefficients are real numbers. Find the remaining zeros of f. degree:5, zeros: -6, 6-i please help and show all work.
*November 23, 2012 by ladybug*

**Math (Reiny??)**

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

**GEOMETRY CIRCLES PLEASE**

The diagram shows tangent circles and lines. if AB=15 CM find AC, AD and AE . Help me reiny and other tutors please<3 thank you this is the figure img19.(imageshack.)us/img19/7143/0eua.png just remove the open and close parentheses thank you
*December 4, 2013 by BARBIE LEE *

**College Algebra**

4x^2=8x-5 Please someone help
*October 21, 2008 by Courtney*

**college algebra**

please help with these 2 problems a) 2/3x+1/6x=2 b) -2x-4<10
*November 16, 2008 by tina*

**college algebra**

x/2-x/x-4=-4/x-4=-4x^2/2 check this please
*May 24, 2010 by Gregory*

**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*

**college algebra--need help please!!**

solve the equation in the real number system. 2x^4-23x^3+75x^2-88x+28=0 What are the real solutions of the equations? please show work. I do not know how to work this at all
*November 23, 2012 by confused*

**College Algebra**

Can anyone please show me how to solve (57 C 102)(47 + 82)
*May 29, 2010 by Amber*

**college algebra**

please help me solve this equation x-1/3x-1/2x-5=0
*February 25, 2013 by ray*

**SAT**

please help. I am a foreigner. I need to get into a US college for a bright future. I bought the College Board SAT book. It has no word lists. How do I do well in the SAT? Any tips? Please give me help.
*January 19, 2014 by Mohammed*

**college algebra--please help**

Form a polynomial f(x) with real coefficients having the given degree and zeros. degrees 5; zeros 1; -i; 7+i please show all work. I am having a hard time understanding this.
*November 20, 2012 by Heather*

**college algebra--I really need help!!**

solve the following exponential equation. exact answers only. 1-9x 2x 2 = e I hope that you understand this question. I don't and need some help please. Can you show all answers please.
*November 25, 2012 by Ladybug*

**College Algebra**

20. Growth of an Account If Russ (see Exercise 19) chooses the plan with continuous compounding, how long will it take for his $60,000 to grow to $80,000? 3. (1/8) to the 2x-3= 16 to the x +1 13. e to the 4x= 4 to the x-2 15. ln (x-4) ln 3= ln(1/5) to the x power 20. Tripling ...
*June 20, 2013 by Phoebe*

**statistics**

At a small college it is known from previous years that 35% of all college freshman start in college algebra. The new freshman class has 100 students in it, What is the probability that between 35 and 42 freshman will start in college algebra? Is it reasonable to approximate ...
*March 23, 2012 by lola*

**College Algebra URGENT**

f(x)=1/(x+4) g(x)1/(6x+4) what is f(composed)g(x) if x does not equal -4/6 please help me
*October 29, 2010 by Jess*

**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*

**College Algebra**

Could you please help me with this problem? We are to graph each compound inequality. x -2y and x - 3y < 6
*September 10, 2007 by Shana*

**College Algebra**

Can some please help me and explain this problem to me! Or if you know of any website that will help! Thanks. -2x+4>12
*November 15, 2007 by Alicia*

**college algebra**

can someone check my answer for me please! 5x+6y=18 solve for y 6y=18-5 y=3-5/6x
*November 16, 2007 by Alicia*

**college algebra**

Please show me how to work this e^.05t =1600
*January 31, 2012 by Betty*

**algebra**

1/2x+6=1/3x Please help. my college grad mom can't help with my 8th grade math!
*September 2, 2008 by Josh*

**College Algebra :( **

Sketch the graph of y=mx for the given values of m. m=3,-2,2/3,-1/4 please help me, I'm so confused!
*September 26, 2011 by Divgar*

**college algebra, Please help!!**

find the domain of the composite function of fog f(x)=x^2+8;g(x)x-5
*November 30, 2012 by confused*

**reiny**

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

**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*

**college algebra**

Please help in solving this problem using the method of substitution -2/3x + Y= 2 2x -3y =6 thanks for your time.
*November 25, 2009 by cheryl*

**College Algebra**

Directions: Find the REAL solutions of the equation x^3-2.6x^2=3.93 Please help, its for my final!
*December 8, 2010 by Courtney*

**College Algebra**

Please help me Divide. (9x^3-10+19+6x^4)/(-2x^2+3x-3) Write your answer in the form Q(x)+ R(x)/ -2x^2+3x-3, where Q(x) is the quotient and R(x) is the remainder.
*January 22, 2011 by jen*

**college algebra**

write the expression as a single logarithm In(x/x-2)+In(x+2/x)-In(x^2-4) Please show work
*November 27, 2012 by Ladybug*

**college algebra**

Solve the following inequality. x^3+9x^2-108 less or equal to 0. Then write your solution in interval notation. I am sooo confused and do not have any idea how to do this. Can someone please show me step by step please??? Thanks in advance. Someone who is confused.
*December 25, 2012 by allison-please help!!!*

**Algebra 1 (Reiny)**

Will you please explain the steps I must take in order to graph these linear inequalities? Graph each system of linear inequalities. Give two ordered pairs that are solutions and two that are not solutions. 1. y < 2x - 1 y > 2 2. x < 3 y > x -2 3. y => 3x 3x + y...
*January 9, 2014 by Victoria*

**College Algebra**

Solve 2x(squared)-3x-2=0 using the quadratic formula. Can someone explain this to me please?
*November 18, 2007 by Alicia*

**college algebra**

solve the equation below. Please show all work. log3(x/2-9)=4
*March 4, 2012 by Tammy*

**college algebra, Please help!!**

solve the following logarithmic equation 2log2(lower than g)^(x-2)+log2^2=3 x=?
*November 27, 2012 by ladybug,I need help please. *

**college algebra**

find functions f anf g so that fog equals H H(x)=x^2+17 please show work
*November 30, 2012 by confused*

**College Algebra**

3x^4=648x someone help please im so confused. i am trying to find the solution set?
*February 1, 2013 by Adrianna *

**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*

**Algebra**

Please help! |x+1|-3 > 8 Solve the absolute value inequalities. Please, please , PLEASE! and thanks.
*December 13, 2011 by Izzy.*

**Please check-Reiny**

Could you check these two problems? 3sqrt (y+2) = 3 is y = 25 Answers were: true or false I said true because I did it like this Square both sides=y + 2 = 3^3 y+2 = 27 y = 25 and sqrt (2y-6) = 3-y for y answes are: no solution 5 3,5 3 I said 3 because I did it like this: 8y -...
*October 12, 2010 by Michelle*

**College Algebra**

Can someone check my answer please? Find the corresponding y values for x= -2,-1,0,1,2,3 if y= x^-x-2. My answers are under Y. X Y -2 -4 -1 -2 0 -2 1 0 2 4 3 10
*November 20, 2007 by Alicia*

**college algebra**

The graph of a power function is f(x)=kx^p, where k and p are constants. Do you expect k to be positive or negative ? Explain please.
*December 8, 2007 by cedric benson*

**college Algebra**

solve by the substitution method. 8x+3y=-40 x=48-7y THE ANSWER SHOULD BE AN ORDERED PAIR. PLEASE HELP ASAP
*April 21, 2010 by Tonia*

**college algebra--please help**

Find a bound on the real zeros of the polynomial f(x)=x^4+4x^3-8x-6 can someone help me, I am confused and don't know where to start.
*November 20, 2012 by confused*

**college algebra, Please help!!**

a circle has the equation x^2+y^2+6x-6y-46=0 find the center and the radius of the euation. If there are any intercepts list them.
*December 9, 2012 by Heather*

**College Algebra **

Write the following in a+bi form (-5-i)/(3-3i) -5/3 and 1/3i (-5/2i)/(-1/5i) 23 and 0i (-2i)^3 -2 and 0 Im having trouble with these probems and here is my answers. PLEASE HELP
*May 28, 2014 by Anonymous*

**College Algebra **

Let Z be equal to (2-5i) The question is z^2 +iz -(5+i) The answer I got for this was -22 + 18i but it isn't correct on my homework page please help/
*May 28, 2014 by Anonymous*

**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 *

**Math(Please respond)**

.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 18, 2012 by Hannah*

**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*

**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*

**College Algebra**

I'm still having trouble with this problem. Can someone please explain the steps to me. -2x+4>12 Is this the next step? -2x+4-4=12-4
*November 16, 2007 by Alicia*

**College Algebra ~ Please Help**

Can someone give me some real life applications that I can use for a quadratic function.
*November 20, 2007 by Alicia*

**College algebra**

I need help finding an equation of the line containg (-5,-9)and (-2,-7) the answer has to be in slope-intercept form y=? Can anyone please help me with this?
*November 28, 2009 by muff*

**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*

**college algebra**

Solve the following equation in the real number system. Please show all of your work. 2x^3-3x^2-14x+15=0
*October 29, 2011 by julez*

**college algebra**

Solve the following equation in the complex number system. Please show all of your work. 2x^5-3x^4-32x+48=0
*January 18, 2012 by Jo *

**college algebra**

graph the function and state the vertex axis of symmetry, the intercepts, if any: f(x)=x^2-8x+15 Please show work so i can understand this. thank you
*August 18, 2012 by alli*

**college algebra**

analyze the graph of the following function. r(x)= x^2+x-6 -------- x^2-x-2 there are 8 steps but they dont make sense to me... please show work!! thanks
*August 21, 2012 by alli*

**college algebra--I really need help!!**

Find the domain of the composite function FOG f(x)= 2/x-3; g(x)= 7/x please show work so I can undestand
*November 25, 2012 by Ladybug*

**College Algebra help please**

I dont understand this. The question is use the remainder theorem to evaluate P(x) as given. 1. P(x)=3x^3+11x^2+2x-16 and it gives me P(1/3)
*February 25, 2013 by Kristen*

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