Sunday

December 21, 2014

December 21, 2014

Total # Posts: 502

**Chemistry**

The Ksp of calcium hydroxide, Ca(OH)2, is 4.68 x 10-6 at 289.15K. Calculate the pH of a saturated solution. Here's my work: 4.68 x 10-6= 4s^3 s= 0.0105 -log(0.0105)= 1.98 14-1.98=12.02 The answer is supposed to be 12.324, but I'm not sure what I'm doing wrong. Is ...
*December 4, 2014*

**Genetics**

A portion of alcohol dehydrogenase enzyme contains 375 amino acids. Including both amino acid and all other necessary codes, how long is the coding portion of the corresponding mRNA? Thanks
*November 16, 2014*

**Help With Statistics**

I would really appreciate help with this. In a survey of 1000 large corporations, 252 said that, given a choice between a job candidate who smokes and an equally qualified nonsmoker, the nonsmoker would get the job. Find a 0.95 confidence interval for p. (Round your answers to...
*November 12, 2014*

**Math**

A family purchased a new ski boat for $20,000. The loan agency required a down payment and financed the balance for 36 months with an APR of Determine the total finance charge and monthly payment for the loan.
*November 9, 2014*

**Chemisty**

In the titration of total acid with sodium hydroxide, NaOH, it was determined that 36.03mL of 0.0980M NaOH was needed to neutralize all the acid in a 10.0mL aliquot of a powdered drink mix solution. In a second titration, it was determined that were 1.45 x 10^(-5) moles of ...
*October 22, 2014*

**Chemisty**

Consider the reaction of sulfuric acid, H2SO4, with sodium hydroxide, NaOH. H2SO4(aq) + 2 NaOH(aq) -> 2H2O(l) + Na2SO4(aq). Suppose a beaker contains 35.0mL of 0.175M H2SO4. How many moles of NaOH are needed to react completely with sulfuric acid? Thank you
*October 22, 2014*

**Chemistry**

What volume of 5.0 M H2SO4 should be diluted to 100mL to prepare a 0.25 M H2SO4 M solution? I know the molar mass of H2SO4 is 98g but I'm not sure where exactly that fits in and how I'm supposed to get it to be diluted. Thank you!
*October 8, 2014*

**Psychology**

analyze the function of emotions as motive.
*July 19, 2014*

**economics**

Using an aggregate demand and supply diagram, explain how each of the following scenarios affects the equilibrium price level and aggregate output. Consider first the short-run, then the long-run equilibrium for each scenario. a) Consumers expect a recession, while resource ...
*July 15, 2014*

**math**

There are 25 red beads,x blue beads and y green beads in a box.When a bead is picked at random,the probability that it is blue is 1 over 4 and the probability that it is green is 1 over 3. (a)Find the value of x and y. (b)How many blue beads must be added so that the ...
*July 7, 2014*

**Riddle**

Haha wow..
*July 7, 2014*

**math**

In a bag,there are 18 cards of which x cards are coloured and the rest are white.When another 6 white cards are added into the bag,the probability of a white card being picked is x over 8.Find the value of x. Answer:6 How?
*July 7, 2014*

**add maths**

A point P moves so as to satisfy the ratio OP:PA=1:3,where O is the origin and A is the point (-4,0).Find the equation of the locus of P.
*June 14, 2014*

**add maths**

A point moves such that its distance from point A(1,0) is twice its distance from B(-2,0).Find the equation of the locus of the point.
*June 14, 2014*

**chemistry pls help me asap**

Thanks a lot^^
*May 15, 2014*

**chemistry pls help me asap**

2.08g of metal Y react with 0.96g of oxygen to form a metal oxide.The empirical formula of the metal oxide is Y2O3.What is the relative atomic mass of metal Y.
*May 15, 2014*

**chemistry**

Solution A:50cm^3 of 1.0mol dm^-3 hydrochloric acid,HCl Solution B:10cm^3 of 2.0mol dm^-3 hydrochloric acid,HCl (a)Calculate the number of moles of hydrochloric acid,HCL in each solution. (b)Solution A and B are mixed together. (i)Calculate the number of moles of hydrochloric ...
*May 7, 2014*

**chemistry pls help me asap**

100cm^3 of a sodium hydroxide,NaOH solution contains 4.0g of solid sodium hydroxide,NaOH.40 cm^3 of phosphoric acid,H3PO4 is needed to neutralise 40cm^3 of the alkali.(RAM:H,1;O,16;Na,23;P,31) (a)Calculate the molarity of the sodium hydroxide,NaOH solution. (b)Calculate the ...
*May 7, 2014*

**chemistry**

200cm^3 of 1.0 mol dm^-3 sulphuric acid,H2SO4 is poured into a 250 cm^3 volumetric flask.Distilled water is then added to make 250 cm^3 of solution. (a)What is the molarity of the diluted acid solution? (b)What is the volume of 1.6 mol dm^-3 sodium hydroxide,NaOH solution ...
*May 7, 2014*

**chemistry**

A student dissolved 3.65 g of hydrogen chloride gas,HCL in water to make 1.0dm^3 of solution.Calculate the volume of a 0.1 mol dm^-3 barium hydroxide,Ba(OH)2 solution required to completely neutralise 25.0 cm^3 of the acid solution.(RAM:H,1;CL,35.5)
*May 7, 2014*

**chemistry**

The volume of 0.15 mol dm ^-3 sulphuric acid,H2SO4 required to completely neutralise 25.0cm^3 of potassium hydroxide,KOH solution.
*May 7, 2014*

**chemistry**

50.0cm^3 of 2.0 mol dm^-3 aluminium sulphate,Al2(SO4)3 solution Calculate the number of moles of ions.
*May 7, 2014*

**chemistry**

Concentrated phosphoric acid,H3PO4 was added slowly into some water to produce 5.0dm^3 of a dilute acid solution.100g of the pure phosphoric acid,H3PO4 was present in the solution.Find the concentration of the acid,in g dm^-3.
*May 5, 2014*

**chemistry**

Calculate the volume of 2.0 mol dm^-3 sulphuric acid,H2SO4 needed to prepare 2.5 dm^3 of 0.5 mol dm^-3 of the same acid solution.
*May 5, 2014*

**add maths**

Find the equation of the perpendicular bisector of the straight line joining the points A(-1,0)and B(3,4).
*May 5, 2014*

**add maths**

Given that log2 3=h and log2 5=k, express log2 0.45 in terms of h and k.
*May 3, 2014*

**add maths**

Given that x=a^m and y=a^n.Express log^a(3 square root x over ay^2) in terms of m and n.
*May 3, 2014*

**add maths**

calculate the value of log square root p p^2.
*May 3, 2014*

**add maths**

Find the value of logb square root b - loga(1/a)
*May 3, 2014*

**math**

Oh thanks..its 2^5=32..
*April 2, 2014*

**math**

Given a set with n elements has 2^n subsets.Find the number of subsets for set A={2,3,5,7,11}.
*April 2, 2014*

**add maths**

10^2n+3 × 20^n × 5^n Step:? Answer:10^4n+3
*April 2, 2014*

**Algebra**

If a salesman earned 6% commissions on sales, and in one week he earned $300 in commissions, how much merchandise did he sell that week?
*March 19, 2014*

**Business Math**

True Value received an invoice dated 4/28/12. The invoice had a $5,700 balance that included $600 freight. Terms were 5/10, 4/30, n/60. True Value pays the invoice on May 12. What amount does True Value pay?
*February 27, 2014*

**Business Math**

A local Barnes and Noble paid a $79.33 net price for each calculus textbook. The publisher offered a 10% trade discount. What was the publisher’s list price? (Round your answer to the nearest cent.)
*February 27, 2014*

**add maths**

f(x)=3x^2-12x+20 Find minimum value and value of x
*February 23, 2014*

**logarithms**

3^x=6
*February 19, 2014*

**Business Math**

Rainfall for May in Fiji averages 9" according to World Travel Guide. This year it rained 5% less. How many inches did it rain this year?
*February 19, 2014*

**math 3**

45 feet
*February 12, 2014*

**Physics**

Where do you get the 14.4*10^16 from?
*February 5, 2014*

**Physics**

If the period of the moon were 31 days while its orbit radius 3.8x10^8m, what would the mass of the Earth be?
*February 5, 2014*

**add maths**

Given that the quadratic equation is (2m+3)x^2+(4m-2)x-(m+1)=0.Find the value of m,if •one of the root of the equation is negative •one of the root of the equation is reciprocal of the other
*February 2, 2014*

**maths**

The sum of a number and four times its reciprocal is 5.Find possible values of the number.
*January 28, 2014*

**add maths**

2+square root 3 & 2- square root 3 Form equation ..
*January 27, 2014*

**add maths**

2+square root 3 & 2- square root 3 Form equation ..
*January 27, 2014*

**maths**

Thank you^^
*January 26, 2014*

**maths**

A woman is now 4 times older than her daughter.Six years ago,the product of their ages was 136.Find their present ages.
*January 26, 2014*

**add maths**

x^2-17x+52=0 The answer is 4,13 But i dont know how to do..
*January 26, 2014*

**add maths**

x^2-17x+52=0 The answer is 4,13 But i dont know how to do.. ASAP...
*January 26, 2014*

**maths**

The question answer is x=8,10....how to get it..pls help me..
*January 25, 2014*

**maths**

The product of two consecutive even numbers os 80.Find the values of the numbers.
*January 25, 2014*

**maths**

The area of the right angled triangle abc (x+4)(x+3) is twice the area of a square with sides x cm.Write a quadratic equation in terms of x.
*January 23, 2014*

**maths**

Ravi bought x toys for 27$ and 3 mechanical pencils for x$.Given that the total cost of a toy and a mechanical pencil is 6$,write a quadratic equation in terms of x.
*January 23, 2014*

**add maths**

Function f and g are defined by f:x→4-x and g:x→px^2+q where p and q are constants.Given that the composite function gf:x→x^2-8x+11,find the values of p and q.
*January 22, 2014*

**Science**

Can someone please please help me? I don't have a text book, i have a online book and it isn't working. Can someone please be nice and help me? Science isn't my subject! 1. Why is Earth’s temperature just right for life? (1 point) Earth’s core is hot ...
*January 21, 2014*

**add maths**

A function f is defined by f:x→(x+1)/ (x-1), x is not equal to 1. If f^2(2)=3f^-1(k),find the value of k.
*January 21, 2014*

**add maths**

Functions f and g are defined by f:x→3 /(x+2),x is not equal to k . No.1~State the value of k
*January 21, 2014*

**add maths**

Functions f and g are defined by f:x→3 /(x+2),x is not equal to k . No.1~State the value of k
*January 21, 2014*

**add maths**

Still didnt get k=-2..no 2 i know alrdy..thnks
*January 21, 2014*

**add maths**

The no. 1 how to do? Your answer in my book is right but i dont know how to do the step
*January 21, 2014*

**add maths**

I still cant get the k is -2..
*January 21, 2014*

**add maths**

Can you show me the step how to get -2?
*January 21, 2014*

**add maths**

Question no 2 Find the value of p for which f(4)=g^-1(p)
*January 21, 2014*

**add maths**

Functions f and g are defined by f:x→3 over x+2,x is not equal to k and g:x→2x+1. No.1~State the value of k
*January 21, 2014*

**add maths**

(x+1)/(x-1)
*January 21, 2014*

**add maths**

A function f is defined by f:x→x+1 over x-1,x is not equal to 1.If f^2(2)=3f^-1(k),find the value of k.
*January 21, 2014*

**add maths**

A function f is defined by f:x→x+10 over x-8,x not equal to 8.Find the values of x for which f^-1(x)=x.
*January 21, 2014*

**add maths**

No.1 y=3x/x-3 x=3y/y-3 xy-3y=3x y(x-3)=3x y=3x/x-3 f^-1(x)=3x/x-3,x≠3 Am i correct ?:D
*January 21, 2014*

**add maths**

Ohh...ok..thank you!
*January 21, 2014*

**add maths**

Reiny,thanks a lot! You are right...can you explain why the answer x is not equal to 1 ?
*January 21, 2014*

**add maths**

Find f^-1 in similar form for each of the following functions. Question no. 1 ↓ f:x→3x over x-3,x not equal to 3 Question no. 2 ↓ f:x→2x+4 over 2x-1,x not equal to 1over2
*January 21, 2014*

**add maths**

Functions f and g are defined by f:x→ax-b,where a and b are constants and g:x→x+5.Given that fg(1)=11 and gf(2)=8. Calculate the values of a and b? What are the values of fg(-1)and gf(3)
*January 14, 2014*

**add maths**

If f:x→4x+5,find the composite function f^2.Hence,find f^2(1over2)and f^2(-2) ? The value of x gor which f^2(x)=9
*January 14, 2014*

**History!**

Can someone please help me? Thanks! I'm really behind and i need to get caught up and i just really need some help! Thanks!! :) 1. As a result of the French and Indian War, _____ claimed all land west of the Mississippi River, and _____ gained control of all land east of ...
*December 18, 2013*

**Chem**

A 0.170-mole quantity of NiCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Ni2 ions at equilibrium? Assume the formation constant* of Ni(NH3)62 is 5.5 × 108.
*December 5, 2013*

**Chemistry**

Which of the following will be more soluble in an acidic solution than in pure water? AgI, Ni(OH)2, KClO4, SrSO4, CaCO3
*December 5, 2013*

**Chemistry**

Calculate the change in pH when 5.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq).
*December 5, 2013*

**Chemistry**

Calculate the pH at the equivalence point for the titration of 0.180 M methylamine (CH3NH2) with 0.180 M HCl. The Kb of methylamine is 5.0× 10–4.
*December 5, 2013*

**chemistry**

For the following reaction, identify the substances oxidized, reduced and the oxidizing and reducing agents? 2SO2 + O2 --> 2SO3
*October 30, 2013*

**chemistry**

For the following reaction, identify the substances oxidized, reduced and the oxidizing and reducing agents? 2SO2 + O2 --> 2SO3
*October 30, 2013*

**Math**

1300cm2=_____ m2
*July 30, 2013*

**chemistry**

calculate the Ph of 0.3 M sodium propanoate, Ka 2.0 x 10 base -3. then calculate the pH after 0.03 mol NCL is added to 2L of the first solution.
*July 20, 2013*

**Applied Geometry maths**

A Maths Applied student holidaying in Sydney notices that the Centrepoint tower has an angle of elevation of 15deg20'. After walking 400m directly towards the tower she now observes the elevation to be 24deg33'
*June 19, 2013*

**Algebra **

How do i factor this problem completely? 216x^3 - y^3
*May 19, 2013*

**physics**

What is the magnitude of the electrostatic force on a +5 C harge 1.75 m to the left of a -2.5 C Charge? (show your work)
*May 14, 2013*

**english**

so you said arguments is logos
*May 8, 2013*

**english**

IN Rachel carson essay FABLE FOR TOMORROW she used only the pathos and ethos Right?
*May 8, 2013*

**english**

should be ETHOS
*May 8, 2013*

**english**

Fable for tomorrow This town does not actually exist, but it might easily have a thousand counterparts in America or elsewhere in the world. I know of no community that has experienced all the misfortunes I describe. Yet every one of these disasters has actually happened ...
*May 8, 2013*

**english**

Pathos
*May 5, 2013*

**english**

ok i got it is LOGOS because he is using reasoning
*May 5, 2013*

**english**

At the foot of these fairy mountains the voyager may have descried the light smoke curling up from a village whose shingle roofs gleam among the trees, just where the blue tints of the upland melt away into the fresh green of the nearer landscape. It is a little village of ...
*May 5, 2013*

**english**

pathos is emotion
*May 4, 2013*

**english **

WHOEVER has made a voyage up the Hudson must remember the Kaatskill mountains. They are a dismembered branch of the great Appalachian family, and are seen away to the west of the river, swelling up to a noble height, and lording it over the surrounding country. Every change of...
*May 4, 2013*

**Public Speaking**

I'm so confused!
*April 24, 2013*

**PS**

An advantage of using media resources for researching your topic is: A. you may listen to an expert in the subject area that you are interested in. B. media resources may set you in a direction of research you did not expect. C. watching a television or radio program may spark...
*April 24, 2013*

**Grade 12 Calculus **

Evaluate each of the following. Show all your calculations. a) f'(3) if f(x) = x^4 − 3x b) f' (−2) if f(x) = 2x^3 + 4x^2 − 5x + 8 c) f" (&#...
*April 15, 2013*

**physics**

A body is allowed to fall from rest through a vertical height of 8.45 m. Gravitational acceleration is 9.8 mis2. Calculate the velocity of the body at the end of the fall.
*January 31, 2013*

**math**

when it came to pass out valentines each of the 24 students had valentine to give to the other students in the class how many total valentines will be passede out?
*January 27, 2013*

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