# Reiny+Damon

685 results

**Reiny or Damon or Bobpursley**

Express the series 11 + 18 + 27 +...+ 171 using sigma notation. Usually you would take 27-18 and that's 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 ...

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

thanks alot!

**Calc and Physics**

Damon and Reiny. Thanks for your quick and thorough responses.

**physics**

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

**help me damon reiny steve bob plzz**

prove that nsini=constant plz show me solution

**maths help plz sir damon steve or reiny**

Find the differential equation from the function y=Ae^3x +Be^2x +Ce^x. Using the method of determinant.

**sir damon steve damon damon help maths**

Record, indicate that t hours past midnight, the temperature at the local airport was T(t)=-0.3t^2+4t+10degree celcius. What was average temperature in farenheit at airport between 9am and noon? Plz damon show step

**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

**Reiny+Damon**

Can you reply to my last math+log post =) thanks. I'm going to be having alot of math questions today.

**maths/calculus damon,steve,reiny help steve**

x³dy/dx + 3y² = xy² Given x=1 when y=1 plz help me show step help!!

**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

**trigonomentry hope steve or damon reiny can help**

If x = cos@ + isin@ , y = cos€ + isin€ ' prove that (x - y)/(x + y) = itan((@ - €))/2 step sir plz

**maths sir damon reiny or steve help!steve see**

Given u(x, y) = x^2 + 2y where x (r, t) = r sin(t) and y(r,t) = sin^2(t), determine the value of ∂u / ∂r and ∂u / ∂t using the chain rule. Plz show step

**maths sir steve plz reiny plz sir damon plz help**

express 1.1 in surd form pllllllz step

**maths sir steve plz reiny plz sir damon plz help**

express 1.1 in surd form pllllllz

**To Reiny**

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

**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)

**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

**plz sir reiny sir steve sir damon help sor bob**

plz help me differentiate arccosh(x/√3) i no that from inverse heyperbolic function cosh=(x±√(x²-1) but i still dont know how to that go about it

**grammar damon be clearr**

damon can you be more clear please.

**algebra sir reiny sir steve&bob damon help**

plz help me sir steve 3x^2=x^x find x step plz too hard

**Math (Reiny??)**

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

**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

**Trig - Thanks Damon**

Thanks for the help Damon. Much appreciated. 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...

**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 ...

**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'...

**Reiny+ In need of help**

Hey Reiny, could you please take a look at my expo growth and decay post? Thanks alot.

**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'...

**Reiny**

Reiny I think I have found out the rectangle problem. Could you check and see if Ive got it correct?

**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.

**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

**reiny**

reiny why are you so smart thanks for aswering my question

**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

**too-hard probability sir damon/reiny/steve help**

A bag contain 10. identical balls of which 4 are black and 6white a random sample of size 4 is drawn without replacement what is the conditional probability that the sample contain exactly two black given that it contain at least 1 white ball.. Please show step plz

**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 ...

**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.

**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!

**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

**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 ...

**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

**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?

**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 !!!!!!!!

**plz sequence sir steve reiny bob damon i need u**

The three real,distint and non-zero numbers a,b,c are such that a,b,c are in arithmetic progression and a,c,b are in geometric progression. Find the numerical value of the common ratio of the geometric progression.. Hence,find an expression in terms of a for the sum to ...

**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 ...

**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 = ...

**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'...

**maths sir damon help sir steve help sir reiny**

The 79 members of a spot club play at least one of the following games Tennis, Football and Volleyball. 19 play Football & Volleyball and 29 play Tennis & Volleyball, n play all the three games. 2n people , each play only one game. How many play Volleyball altogether.? Plzzzz ...

**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?

**to reiny**

Reiny i got (x+5)(x-3) x=-5 or x=3

**Math thanks, Reiny**

Thanks Reiny!

**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 ...

**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 ...

**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...

**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 ...

**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 ...

**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...

**Maths - Reiny**

Show that the equation 3x^2 - x^3 + 3 = 0 can be rearranged to give: x = 3 + 3 ---- x^2 x^3 = Divide by ? = x = 3 + 3 ---- x^2 Using Xn+1 = 3 + 3 with x0 = 3.2 ---- x^2n find the values of x1 x2 and x3? What to the values of x1 x2 and x3 represent? The represent estimates of a...

**maths steve reiny bob reiny!!! Help**

If line 2x+y=-3 and x-2y=1 form the sides of a rectangle whose other sides meet at the point (3, 4), find the equations of the other sides and the area of the rectangle plz help show solution step

**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 ...

**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. :)

**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 ...

**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 ...

**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 ...

**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, ...

**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...

**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 ...

**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...

**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

**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 ...

**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 ...

**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...

**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...

**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...

**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 ...

**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 ...

**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 ...

**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 30º, the two sides are not equal, they differ by 1 oh , thank you Mr Reiny I'll tell my teacher this Question is ...

**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 ...

**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...

**damon (: !**

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

**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 ...

**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

**to Damon**

thanks ayways!

**to Damon**

is the answers 3 and 3?

**Steve - Damon is not sure!**

Steve, I am not sure about this: http://www.jiskha.com/display.cgi?id=1390496194 Damon

**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 ...

**QUESTION FOR DAMON**

y=2SQRT(x-1)

**TO; Damon**

Thank you for the gravity answer 78.4m

**Math**

Damon, how did you get your answer?

**math101**

need Damon help

**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...

**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 ...

**algebra**

Damon, the problem in the book is 5/8*t + 2/15*t = 17/20

**Trig - Thanks Damon and Lindsey**

Thanks a bunch

**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...

**S.S (DAMON)**

can anyone explain the advantages and disadvantages for interdependence

**probability**

Reiny, thanks!

**ThankYou Reiny!!!**

Thank you!

**Maths**

Thanks Mr Reiny