Shenaya

If z is any complex number where |z|=1,show that using the Argand plane 1<= |z+2|<=3 and (-pi/6)<= arg(z+2)<= (pi/6)... I know if we take z=x+iy |z|= root(x^2+y^2) so |z+2|=root[(x+2)^2 +y^2] I don't see a way to proceed

8 years ago

How do we find the value of(1.01)^5 approximately up to three decimals,only with the use of the Binomial theorem?

8 years ago

We were given a 0.1 M KOH solution.25cm3 of that solution is taken and 5g of MX precipitate is added to that.X- is an anion of a strong acid. Kb for MOH=2*(10)^-5 Ksp for MX= 3*(10)^-6 M 1)find the [M+] in the solution 2)Find the [X-] concentration and pH...

8 years ago

How do we integrate [(cosx)^2(nx)(sin(nx))]/[a-(cos(nx))] dx?

8 years ago

Question: 50cm3 of 0.4 M Ba(OH)2 and 50cm3 of HA of unknown concentration is added together.At 25°C,pH of the solution is 9.With appropriate assumptions calculate the [HA] and ka of HA. My thoughts on the question: There are more than one approach which c...

8 years ago

Question: An unknown mass of (NH4)2CO3 is mixed with 4g of NaOH and dissolved in 100cm3 of water,which results a clear solution.Gasses are removed by heating the final solution. 2 parts of 25cm3 of final solution is taken and one is titrated with 0.5 M HC...

8 years ago

A chemical "X" is included in a water in a pond. 1)5dm3 of water from the pond is taken and is mixed with 200cm3 CHCl3.Then CHCl3 layer is taken out separately and left to vaporize. Then the remaining mass of X is measured.There was 10mg. 2)The remaining...

8 years ago

Question: v cm3 of a 0.2 M HX solution and v cm3 of 0.1 M KOH solution is mixed.pH of the final solution is 5.3 1)Find ka of HX 2)Find the moles of NaOH and HCl should be added respectively,for the pH of 1dm3 of the solution to increase and decrease by 1...

8 years ago

Question: If z1 , z2 ,z3 are complex numbers and |z1|=|z2|=|z3|=1 and (z1)^3+(z2)^3 + (z3)^3 +z1*z2*z3=0 find the maximum and minimum values of |z1+z2+z3|. My thoughts on the question: Let z1=a , z2=b and z3= We know that |a+b+c| <= |a| + |b+c| |a|=1 So |...

8 years ago

Question: A solution of H2X of unknown concentration is given. pH of the solution is 4. ka1=2*(10)^-6 M ka2=1*(10)^-11 M Find the concentrations of [H2X] ,[HX-] and X^2- in the solution. My thoughts on the question: The temperature which the solution is k...

8 years ago

State whether this infinite series converges or diverges? 1+(t) + (t^3)+...... t=[(5x+6)/(3x-2)] My thoughts on the question: The sum of 'n' terms in a geometric progression is a[r^n - 1]/(r-1)--(let's calk this 1), where r>1 and when r<1, it is [a(1-(r^n...

8 years ago

/display.cgi?id=1496234706

8 years ago

Question: Prove that [integrate {x*sin2x*sin[π/2*cos x]} dx] /(2x-π) } from (0-π) = [ integrate {sin x*cos x*sin[π/2*cos x} dx ] from (0-π). My thoughts on the question: We know that integrate f(x) dx from (0-a) = integrate f(a-x) dx from (0-a) From that...

8 years ago

Question: At 300 K,Carbon powder and O2 are included in container of 10dm3.When the system is heated well,all the O2 converts into CO2.Then the system is cooled to the initial temperature. The volume of the Carbon powder is negligible. Find the percentage...

8 years ago

Using a suitable substitution show that integrate {[ln|1+x|]/[1+(x)^2]} from 0-1 = (π/8)ln|2| On this one, I don't really have any ideas of going forward solving this.I don't see a substitution which will simply the integral.

8 years ago

But how do we integrate ln|1+tanx| da X=theta =int.[ln|cos x|dx] +int.[sin x| dx ] - int.[ln|cos x| dx] ?

8 years ago

10g of AgI is dissolved in 100cm3 of water and Na2SO4(s) is added to the solution with the ppt.After about 10mins.25cm3 of the solution is taken and added Cl2 and heated.The remains Cl2 is removed and a small amount of KI(s) is added and then the solution...

8 years ago

What is more basic KO2 or KOH? I know that KO2 is also craeted this way; KO2 + 2H2O ----> 2 KOH + H2O2 + O2 I think,as KOH is created by this reaction and KO2 being a raectant, the compounds created should have less strong,more stable characteristics when...

8 years ago

Under special conditions D2 is reacted with Ca to make CaD2.What would result if D2 is reacted with H2O?

8 years ago

When an acid is titrated with a Carbonate, do we have to heat the system when Hph is the indicator? If so what is the reason?

8 years ago

How do we integrate {[1/(√(1-x^2) )]*[ln|(2x+3)(√(1-x^2))] } ? Is there any suitable substitution or do we have to do this by parts? I don't have any idea to proceed on.

8 years ago

Why Ammonia is a deviation from the Henry's Law,when it is dissolved in water? Does that has anything to do with Ammonia having Hydrogen bonds? Or what could be the reason?

8 years ago

What will happen from the following if H3C-C6H6-N2Cl is treated with Na2CO3? a)CO2 will emit 2)NH3(g) will emit c)N2Cl-C6H6-CH3 will be produced d) NH2-C6H6-CH3 will be produced We get C6H6-NH2 when Sn/conc.HCl are reacted with Nitro Benzene.This become A...

8 years ago

Question: For any positive integer n,show that integrate.[(sin x)^2n dx ] from o - π/2 = [(2n)!*π]/[(2)^(2n+1)*(n!)^2 ] What I thought: Let I =int.[(sinx)^2n dx] And again I= int.[ (sin(π/2-x))^2n dx] = int.[ (cos)^2n dx] 2I= int.[(sin x)^2n + (cos x)^2n...

8 years ago

Question: f(x)=ax^2 + bx + c {a,b,c €R} When 0<=x<=1 , |f(x)|<=1 Show that |a|+|b|+|c| <= 17 I don't see a way to even start this. I know we can take the discriminant of this function as [(b^2)-4ac] This function will have either two distinct real roots o...

8 years ago

Regarding my question on display.cgi?id=1496901710(I can't post URLs) Can we apply the formula PM=dRT seperately to the systems before and after being heated,and solve this one?

8 years ago

Can Cu2+ oxidize 1) SO2 2) C2O4(2-) Does this happens also when the solution is basic? Cu2+ + H2S ---> CuS + H2

8 years ago

We are asked to order the following compounds considering their hydrolysis. 1)CH3COCl 2)CH3CO-C2H5 3)CH3-CO-N:H2 4) CH3-CO-O-CH3 What are the main factors which determine how easily they tend to hydrolysis?

8 years ago

When a concentrated NaCl aqueous solution is electrolyzed, what is the reason for the stabality of the products to be lesser stable as of thermodynamically, with respect to the reactants? Is it because the products are gasses? H20(l) +4e--->H2(g) + 2OH-(a...

8 years ago

What is more acidic from [CuCl4]^(-2) and ethanoic acid? And what is the reason?

8 years ago

Can we convert an ideal gas into a liquid?

8 years ago

What will happen if we add Mg powder to a (NH4)2SO4(aq) solution? What would be the products?

8 years ago

With which of the following AgNO3 makes a precipitate quickly? And what would be the reason? 1) C6H5Br 2)C6H5-CH2Br 3)(CH3)3-C-Br 4)C6H5-CH2-CHBr-C(triple bond)H 5)C6H5-CH2Br-CH=CH-CH3 I feel like that 1st one is most probably,not the answer as it is not...

8 years ago

We have been thought that BaC2O4 is a precipitate when dissolved in H2O. When comparing its solubilty in water and in an aqueous acidic solution,what is the reason for its higher solubility in an aqueous acidic solution than water?

8 years ago

How do we order the following considering their acidic nature? 1)CH3COOH 2)Phenol 3)C6H5COOH 4)CH3C(triple bond)CH 5)a cyclic alcohol [ (CH2)5-CH-OH ] I know that Phenol is acidic than alcohols and Carboxylic acids are acidic than alcohols and the alpha H...

8 years ago

Does Ethanoyl Chloride gives out a white precipitate with aqueous AgNO3? We've been thought that an acid chloride gives out the relative Carboxylic acid with water.So in the same way can we take that Ethanoyl Chloride reacts with the water in this aqueous...

8 years ago

A hemisphere of radius r is placed on a horizontal plane and a small mass of "m" is placed on the top of the hemisphere. Find the height from the ground to the mass m,at the moment it loses it's contact with the hemisphere.And the contact is frictionless....

8 years ago

What should be the pH value of the solution to double the solubility of the ionic compound NX? Ka of HX=2*(10)^-5 M My thoughts on the question: Let the solubility of NX=x M 1) NX(s)<====> N+(aq) + X-(aq) eq:con: x x (moldm-3) X^-<===> HX + OH^- -->(2) HX...

8 years ago

This is regarding the Biochemistry question postef by Grace.. I'm wasn't able to mention this in the subject section due to the large no.of characters! I apologize for any inconveniences made! In this case,to calculate pH of the solution, we should find t...

8 years ago

How do we order the following,considering their stability when they are in (+3) oxidation state? Al Ga Tl Sc We've been taught that (+3) is the common oxidation state of Sc. And when it comes to Al ,Ha,Tl how do we order them?

8 years ago

If we wish to find the molar mass of a pure solid organic compound, which measurement would be most useful and why? A)melting point of the solid B)melting point depression of the mixture of the solid with 1,4-dichlorobenzene C)Heat of combustion D)solubil...

8 years ago

Why can't we apply Kd directly to a equilibrium solution of CCl4 and H2O,with CH3COOH dissolved? Do CH3COOH form polymers in CCl4? or are their single molecules of CH3COOH in CCl4?

8 years ago

If we are given the ksp of AgCl at 14°C and 42°C,how do we find the ∆H° for the dissociation of AgCl(s)?

8 years ago

If we were asked to order SO2,H2O,CuO and CaO considering their acidity, how do we find what is more acidic from CaO and CuO?

8 years ago

A rope kept on a horizontal plane moves with a constant acceleration. If a constant force "f" acts on the rope,the tension of the middle of the rope is T. Which of the following are true? a)If the rope has a weight,T/f=1/2 b)If the rope is light,T/f=1 c)I...

8 years ago

Order the following considering their boiling point in an aqueous solution. 1) pentan-2-one 2) pentan-2-ol 3) 2-aminopropanoic acid The answer key says the order (increasing) is, 1 < 2 < 3 and states 1 only have weak permanent dipole dipole forces and Van...

8 years ago

Is there any method to calculate the value of (1+i)^n + (1-i)^n , without using the binomial theorem or Euler formulation? As (1-i) is the conjugate of (1+i) we can take the value of (1+i)+(1-i)= real part of (1+i) But how to avoid Euler formula?

8 years ago

7 men are 5 women are seated in a row.Find the ways they can be sated so that two women are not together. Starting with a man, the ways=(7!*5!)*2!,multiplied by 2! because we can reverse the way seated. Starting with a woman, ways=(5!*7*6*5*4)*(3*2*1),mul...

8 years ago

Show that integrate.[e^(-4x)*(cos 3x)] from 0-infinity =4/25 I got the answer(without applying limits) as, {(e^(-4x) )[3sin(3x) - 4cos(3x)]}/25 But when applying the upper limit what is the value of, {(e^(-infinity) )[3sin(3*infinity) -4cos(3*infinity) ]...

8 years ago

Question : State whether the following are true or false. SO2 gas changes the colour of a KMnO4(aq) solution They have taken this as false and given the following equation: SO2+H2O+2KMnO4-->K2SO4+MnSO4+H2SO4 (not balanced) But why they have taken this as...

8 years ago

State whether the following statements are true or false. The importance of using H2 O2 cell in jet engines; a)because it doesn't release gasses which cause Greenhouse Effect b)because it doesn't release gasses which cause Ozone layer depletion The answer...

8 years ago

I can't submit a follow up question or thank the tutor after an answer or a response is posted by a tutor,as the "post answer" button not available in the bottom of the form,as it used to be. I tried reopening,refreshing the browser and switching the brow...

8 years ago

I apologize for having to bother you again,but I still can't post follow up questions and I can't find the reason.I even tried reinstalling the browsers,and still the same. Anyway you responded to my last post regarding H2 O2 fuel cell, "I agree". So did...

8 years ago

Yes,I used my phone to access this site from the very first day because I'm far from home due to my studies and usually I use my phone to get help with my studies.And it wasn't until yesterday this happened. So will I have to post it as a new question,eve...

8 years ago

I don't know whether suggestions are welcomed,but I would like to express what I feel about this change and hope anyone won't misunderstand this as being rude. From my point of view this change will be causing some difficulties to students and also tutors...

8 years ago

I forgot one main thing:it would be a great help for us students,who use phones,if we are allowed to post the link to our original questions. Thanks again!

8 years ago

Why do Chloroethanoic acid(s) do not hydrolyze? Is it because it they has(have) Cl atom(s)? But the NH4^+ ions in NH4Cl do hydrolyze. What is the reason for this difference?

8 years ago

The equation 2x^2+2y^2+x+4y+2c=0 represents a circle.(let's name it S1) 1)Find the values of a,b and and show that c<(17/16) 2)For positive integers of c,if the above circle is divided into two by, (x+p)^2=p^2 circle,find the value of the constant p. 1)I...

8 years ago

When comparing the boiling points of two compounds,one is a gas and the other is a liquid,is there anything like the liquid will have a lower boiling point than the solid? The molecular mass of the liquid is lower than the solid and they have the same typ...

8 years ago

1)In the reaction O2+2F2--> 2 OF2, F2 is the oxidizer. 2)F can't have positive oxidation states. Does 2 explains the reason for the 1st one or is it because because of F's higher electronegativity?

8 years ago

Do the reaction rate depends on the concentration of catalyst? I googled this and found that the decomposition of H2O2 stops of we add excess MnO2. Are there any other examples like this? Or does this happens with every catalyst when they are in excess or...

8 years ago

Does a neutral solution always act as a buffer solution?

8 years ago

How do we order the folllwing considering how easily they grab H^+ ions, when dissolved in liquid ethanoic acid? 1)OH^- 2)F^- 3)Cl^- 4)Br^- 5)I^- I think the correct order is 5<4<3<2<1,because I^- is strong acid cation and may not like to grab H^+ ions et...

8 years ago

Find the greatest value of a,so that integrate [x*root{(a^2-x^2)/(a^2+x^2)} ] from 0-a<=(π-2) Let I =integrate{ [x*root{(a^2 - x^2)/(a^2+x^2)}]dx } from 0-a I used the substitution u=root[x^2+a^] to simplify the further. After substituting and changing li...

8 years ago

Show that for real x that {[cos x + 2 sin x + 1]/[cos x + sin x] } cannot have a value between 1 and 2. Let y = [(cos x+2 sin x + 1)/(cos x + sin x) ] y(cos x + sin x) = (cos x + 2 sin x + 1) sin x(y-2) + cos x(y-1)=1 , I just feel that this isn't the way...

8 years ago

I posted a follow-up question to your response at my post available at, display.cgi?id=1501575066 Hope you saw it! Thank you!

8 years ago

Inside a box(mass "M"), a light string "X" is atthached to it's bottom and the other end of the string is attached to a mass "m"(this makes a pendulum). This system is attached to the point O(the center of gravity of the system), by a string " Y" and move...

8 years ago

The speed of light in vacuum depends on, 1)wavelength 2)frequency 3)intensity 4)temperature 5)none of the above I know that 1 and 2 are correct. What about the others?

8 years ago

A man climbs down a rope which is connected to a tree.The breaking stress of the rope is 75℅ of his mass.Find the maximum acceleration he can climb down the rope? Does the breaking stress here acts as the tension(T) If so by applying F=ma downwards, mg-T...

8 years ago

cgi?id=1501763622#1501763622.1501764356

8 years ago

8cm

8 years ago

Thank you Steve!

8 years ago

Thank you!

8 years ago

What about the concentration of KX ,formed from the reaction of KOH and MX? Doesn't KX dissociate and do we have to neglect the hydrolysis as X- is a strong acid anion?

8 years ago

A mole of gas has a volume of 22.4Lat STP.Now find the total moles of gas in the mixture by (14.30)/(22.4). And you know the molar masses of At and Ne.you can find the moles of At and Ne as follows: Moles of Ar =(7.2)g/(molar mass of Ar)gmol-1 Moles of Ne...

8 years ago

Just checked the answer. Thank you very much for your explanation...

8 years ago

DrBob222 just saw your answer to this question.can I know whether my method of solving is correct or not? Thank you..

8 years ago

And what if the question is as follows; Integrate [(nx)(cosx)^2(sin(nx))]/(A-(cos(nx) )? After applying the same method as you,(I used both of the substitutions you used)I got Integrate [(1/n)[u*(cosu)^2 dv]/v] ? What is the cleverest method to proceed on...

8 years ago

DrBob222 what if we add HCl to the solution hoping to increase the solubility of MX.Will that work? I think no because X- being an anion of a strong acid,it will only increase the Cl- concentration(generally concentration of anions) which will decrease th...

8 years ago

Your thoughts seems to be fine and logical! I have a few questions 1)At start shouldn't we take the moles of Ba(OH)2=(0.4)*50*(10)^-3 moles ,considering the concentrations becoming half of the initial values as the volume becomes double value.(Or at start...

8 years ago

For the second question I found my mistake. I've calculated initial Ba(OH)2 moles as (0.2)*50*(10)^2*(10)^-3.It should be (0.2)*50*(10)^-3 Then the HA moles used approximately equal to=2*(0.2)*50*(10)^-3= (c/2)*50*(10)^-3 So c=(2/25)*(10)^2*(10)^(-3)=(2/2...

8 years ago

From next time I'll do so.Sorry for the inconvenience caused and thank you for your help.

8 years ago

Thank you for the explanation

8 years ago

Or for the first part we should consider m as the mass of in 5dm3 and continue the calculation,cause we are taking two parts of water each 1dm3,from 5dm3 of water?

8 years ago

=(2x-3y)(2x+3y) + (2x-3y) =(2x-3y)(2x-3y+1)

8 years ago

Sorry for any inconveniences caused due to the mistake done by me by posting "@DrBob222" in the name section except for the subject question.

8 years ago

Its okay there's no rush.I was working out some questions we were given. I also agree with you.This question is all about substituting values to a equation.Yet I have doubts on this one :-( But that formula is not taught in our curriculum and I'm sure the...

8 years ago

Thank you.I'll try that

8 years ago

But we are adding NaOH,not KOH.So can we simply apply the moles added(x) into, HX+KOH--->KX+H2O ?? Or we can simply do that because both are providing OH- ions to the solution?

8 years ago

Thank you very much! Now I see that I've made too many bad mistake while solving this. 1) considering the hydrolysis of KX(K+ is a strong base action) 2) considering a reaction of a acid with another acid(HX+HCl) 3)considering a reaction of a base with an...

8 years ago

We can see that t>1 for x>(-4) and t<1 for x<(-4)

8 years ago

Please add the website name to the front of the URL cause I'm not allowed to post URLs. The question and my work can be found on the above link. Thank you!

8 years ago

pi is displayed as a question mark here.

8 years ago

So we have to apply the two different formulae for the t>1 and t<1?

8 years ago

I missed that! Thank you!

8 years ago

Thank you!

8 years ago

I've heard about "numerical integration" but we haven't been taught that.So I should solve this without using that method.

8 years ago

That worked!!! Thank you very much!

8 years ago

Thank you very much for thd explanation and checking the answer

8 years ago

Can I know why dont we simply find the remaining I- after keeping the solution for some time,after adding AgI. Why do we have to wait 10mins after adding Na2SO4? Is it because dissolving Ag2SO4 in water takes time?

8 years ago

Thank you!

8 years ago

Thank you!

8 years ago

This is a given to us at an exam and they haven't told a reason for the process but have given those details(I've mentioned before MY questions ) for us to answer the question. I was curious about procedure and the reasons.

8 years ago

Thank you!

8 years ago

Well...If this is about finding the ksp of AgI,why do we reduce of the solubility of AgI by adding Ag+ to act as a common ion? So it is more like finding the solubility of AgI in a solution with the same cation

8 years ago

Thank you!

8 years ago

Can we use the substitution t= ln|(2x+3)*(1-x^2)^(1/2)|? Will that make this simpler?

8 years ago

What if the limits are 0-1?

8 years ago

Density(volumetric mass density) =mass/volume

8 years ago

So this expansion has 26 terms.Let consider the (r+1)th term and let's name it T(r+1) So T(r+1)= nCr*[(x^2)(n-r)]*[(1/x)^r nCr=[n!]/[(n-r)!*(r)!] = nCr*[(x^2)(n-r)]*[(x^-1)^r] = nCr*[(x)^(2n-2r-r)]=nCr*[(x)^(2n-3r)] When r=5 ,we get T(6) which is the sixt...

8 years ago

Subject should be corrected.

8 years ago

Thank you very much!

8 years ago

27=9+18=9+(2*9)

8 years ago

I tried that method and got the percentage as 37/5℅ ,which is the given answer. And also I tried the method you suggested which gave out the answer 49.14℅ as the percentage. So just wanted to know the reason for the contradiction of the answers I got from...

8 years ago

*37.5℅

8 years ago

Can I ask what would be the products of Cu2+ + SO2 --> Cu2+ + C2O4(2-) -->

8 years ago

There you gave the density of O2 as 1.42*273/300 and density of CO2 as 1.96*273/300 So I calculated it this way (1.96-1.42)*273/300*100℅= 49.14℅ The change in values seems to have made the difference..

8 years ago

Thank you very much... Actually the question was to choose what can oxidize Cu2+ from; 1)H2S 2)SO2 3)KI 4) C2O4(2-) So had doubts about SO2 and C2O4(2-) And regarding H2S I've learned that CuS ppt in acidic solution,but haven't heard about CuS ppt in basi...

8 years ago

In hot water?

8 years ago

Thank you!

8 years ago

Would [CuCl4]^(-2) be hydrolyzed? : Cl- <===> HCl + OH- But Cl^(-) is a strong acid anion..

8 years ago

Thank you very much! :D I'll keep that in mind for sure!

8 years ago

Thank you for the explanation!

8 years ago

If we consider only the first dissociation, (assuming that the concentration of H+ ions we get from the second dissociation is negligible) H2X(aq)<===> HX^-(aq) + H^+(aq) Equ. concentrations of H2X(aq)=(10^-3)-[(10^-3)/2] moldm-3 H^+(aq)=[HX^-(aq)= (10^-3...

8 years ago

I see! Thank you very much!

8 years ago

Applying F=ma towards the center of the circle 750=ma (m-mass of the pilot) a=(v^2)/r (r- radius of the circle) 750=m(v^2)/r r= [m(v^2)]/750

8 years ago

Thank you!

8 years ago

But we are asked to order them without giving the ka values?

8 years ago

Thank you!

8 years ago

And in both cases R cannot be the same too.

8 years ago

But at the top if we apply F=ma towards the center of the hemisphere it would be, mg-R=mv^2/r right? So how do we eliminate R?

8 years ago

Got it! Thank you very much!

8 years ago

I think B is most probably not the answer,we don't know whether they will react. I think A may be the answer,so then we can compare it with the other compound series and try performing the reactions or identifying tests of that series(MAYBE) No I think C...

8 years ago

So you think this has nothing to do with the reason (2nd statement)?

8 years ago

This is the first time I've ever heard this.Thank you!

8 years ago

I understand... Thank you!

8 years ago

There are no mention about how accurate this molar mass determination should be made and yes that's what I were thinking about A and now I understand its not the most useful data. And I think from B and C,C is the most possible answer. And thank you very...

8 years ago

And Ca(OH)2 is also partially soluble in water right?(a white precipitate forms) And I've heard that as Cu is attracting electrons most Cu compounds are acidic. Is this true?

8 years ago

Can you explain from where the fraction (1/2) comes from?

8 years ago

*the Oxygen atom in the Carbonyl group

8 years ago

But isn't there any chance that the Oxygen atom in the ketone molecule can make H bonds with the H^+ ions in water,not with another ketone molecule?

8 years ago

n is a positive integer.

8 years ago

Thank you!

8 years ago

Hmm..Thank you very much

8 years ago

Maybe the liquid water, is turning to vapour when the engine is active??

8 years ago

NaOH mols=0.5*500 NaOH mass required=0.5*500*molecular mass of NaOH

8 years ago

typo: mass required=0.5*(500*10^-3)*40 g

8 years ago

Actual date is 29th of July 2017. And now its all resolved! The submit button appears as before.

8 years ago

But can I know what actually happens? What really is being released? Liquid water or H2O vapour?

8 years ago

Thank you! Unfortunately they haven't given answers for this one.

8 years ago

Let the bigger number b "y" and the other will be "y-6" as they differ by 6. The sum of their squares=y^2+(y-6)^2=116 (y-6)^2=y^2 -2*6y + 6^2 So 2y^2 - 12y + 36 =116 Now solve for y.You can use quadratic formula.

8 years ago

Let the number be a ,so its reciprocal is (1/a) Multiplying both sides by 12a we get, So a - (1/a) = 7/12 12(a^2) - 12 = 7a 12(a^2) - 7a - 12 =0 Now solve for a.

8 years ago

*so a - (1/a) =(7/12) Multiply both sides from 12a to get, 12(a^2) - 12 =7a

8 years ago

Thank you!

8 years ago

And what if it's (x+p)^2 + y^2 =p^2 ,instead of (x+p)^2 = p^2 ? How do we eliminate y^2 ?

8 years ago

I've studied calculus. And we're asked to find this for positive integers of c,(c<(17/16) )

8 years ago

Thank you!

8 years ago

And one more question: Is the type of bond(covalent!ionic) also important in deciding how easily a compound will hydrolyze?

8 years ago

Thank you!

8 years ago

Or are they both reasons(as they are related)

8 years ago

At the same temperature one is a liquid and other is a liquid. Being a liquid and having one more step to become vapour,is that a reason for the liquid to have a lower boiling point than the solid?

8 years ago

Yes...Both of them are right. But the answer key has taken that 2nd statement doesn't explain the 1st.That's what I've being thinking about...

8 years ago

I think we have to assume that they are under the same pressure to compare their boiling points. I should've mentioned that!

8 years ago

I've made a very bad mistake.It should be corrected as one is a solid and the other is liquid. I apologize for the inconveniences made!

8 years ago

Question: At the same temperature and under same pressure, one is a liquid and the other is a solid.The molecular mass of the liquid is lower than the solid and they have the same kind of intermolecular forces. Can we simply say the liquid has a lower boi...

8 years ago

Thank you!

8 years ago

I understand and thank you very much!

8 years ago

Never mind and thank you!

8 years ago

How about I2 and Br2 for an example,at room temperature? Br2 is a liquid at room temperature and it's molecular mass is lower than I2(s) and they have same kind of intermolecular forces too.

8 years ago

(x+1)^2 = x^2 + 2x + 1 So x^2 + 2x + 1 = (7)^2 = 49

8 years ago