Najid M

Points L, M and N are midpoints of the sides AB, BC and CA of the triangle ABC. Show that

(a) AB + BC + CA = 0

(b) 2AB + 3BC + CA = 2LC

(c) AM + BN + CL = 0

Points L, M and N are midpoints of the sides AB, BC and CA of the triangle ABC. Show that

(a) AB + BC + CA = 0

(b) 2AB + 3BC + CA = 2LC

(c) AM + BN + CL = 0

1. Calculate the pH of the solution formed by adding (15 cm3 of 1.0 M sodium hydroxide)

to (30.0 cm3 of 1.0 M propanoic acid) ?

2. What happen instead if the volume is the same but the molarity of sodium hydroxide change to 0.5 M ?

Number two is not a real question but one that I made up because I'm just curious to know as I only have little idea on how concentration works. Only thing I know is molarity is a part of concentration, right? I am doing A-level (and yes I still have a hard time on basic concept such as this) so please keep your explanation at the level that I can understand, thanks :)) .

The acid dissociation constant of propanoic acid at room temperature is 1.35 x 10^-5 mol/dm3.

Calculate the pH of each of the following aqeuous solutions at room temperature :

1. Propanoic acid of concentration 0.05 mol/dm3

2. A solution containing 0.05 mol/dm3 propanoic acid and 0.05 mol/dm3 sodium propanoate.

If y = 2x(x-1) ,

express d^2y/dx^2 + x(dy/dx) + y in terms of x in its simplest form.

Hence, find the value of x which satisfies d^2y/dx^2 + x(dy/dx) + y =6 .

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Okay, now the only thing that I am unsure about is x(dy/dx). How do I get that?

If y = 2x(x-1) ,

express d^2y/dx^2 + x(dy/dx) + y in terms of x in its simplest form.

Hence, find the value of x which satisfies d^2y/dx^2 + x(dy/dx) + y =6 .

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Okay, now the only thing that I am unsure about is x(dy/dx). How do I get that?

y = ( 1 ) / ( 3x^2 - 4x )^3

note : 'x' as in letter, not multiplication symbol. also, i know how to use chain rule (replace/assume etc) but this is quite confusing.

Great thanks to those helping

y = ( 1 ) / ( 3x^2 - 4x )^3

note : 'x' as in letter, not multiplication symbol. also, i know how to use chain rule (replace/assume etc) but this is quite confusing.

Great thanks to those helping .

Can anyone show how to differentiate " y = x tan 3x " ? Thanks.

25.0 mL of vinegar is diluted into a 250 mL volumetric flask. Does this mean the number of mole is 0.1mol?