Maths D 22

[sourov97]

I got 6. I got 5 at first, then I further stretched the tangent and got 6 from it's equation.
The correct exact gradient was 4.5 and I'm hoping that my answer is in range.

i differentiated the equation using my calculator at x = 1.5....and fount it 4.999 which is 5 approx

 

[Saad Mughal]

$1.52

 

[Ammarfasih]

one more: ...what was the solution...the last question from the graph..maybe the equation was sht like 2x^3 - 3x^2 + 4 = 0

i got 0.9 by drawing a line y=1 ..! Hope this will be correct

 

[Saad Mughal]

i differentiated the equation using my calculator at x = 1.5....and fount it 4.999 which is 5 approx

The thought of differentiating didn't occur to me, I differentiated it when I came home and it was 4.5, but the tangent carries one mark. I'll get that, just worried about the gradient.

 

[Saad Mughal]

i got 0.9 by drawing a line y=1 ..! Hope this will be correct

-0.9

 

[Ammarfasih]

If you showed all the working and everything then made the correct conclusion, you might get the mark(s).

what about the mensuration question ..! In surface area do we have to include base ... ?

 

[Saad Mughal]

what about the mensuration question ..! In surface area do we have to include base ... ?

Yeah. 610 cm^2.

 

[danial 234]

what about the mensuration question ..! In surface area do we have to include base ... ?

ya it was six hundred and something

 

[Ammarfasih]

-0.9

yes -0.9

 

[Heyyy]

$1.52

For Simone,you did-
8000*3.5*2
-------------
100

Right?

 

[sourov97]

The thought of differentiating didn't occur to me, I differentiated it when I came home and it was 4.5, but the tangent carries one mark. I'll get that, just worried about the gradient.

can u remember what was the equation...i think it was 2x^3 - 3x^2 + 5.

 

[Saad Mughal]

For Simone,you did-
8000*3.5*2
-------------
100

Right?

Yeah.

 

[Saad Mughal]

can u remember what was the equation...i think it was 2x^3 - 3x^2 + 5.

Yes, and the gradient is 4.5, and the range is going to be 3.5-5.5.

 

[sourov97]

yes...the gradient was 4.5...differentiating gives 4.499..

 

[Ammarfasih]

Yeah. 610 cm^2.

yr ... ! i thought not to include the base ..! Cux they didn t ask for the TOTAL surface area .. !I just not include it ..!
probably will be penalised ... !

 

[sourov97]

Yes, and the gradient is 4.5, and the range is going to be 3.5-5.5.

u mean if i write 5..will i get marks?

 

[Saad Mughal]

yes...the gradient was 4.5...differentiating gives 4.499..

 

[Saad Mughal]

u mean if i write 5..will i get marks?

You will. I won't.

 

[Heyyy]

yr ... ! i thought not to include the base ..! Cux they didn t ask for the TOTAL surface area .. !I just not include it ..!
probably will be penalised ... !

Will be given 1 mark I guess

 

[Saad Mughal]

yr ... ! i thought not to include the base ..! Cux they didn t ask for the TOTAL surface area .. !I just not include it ..!
probably will be penalised ... !

You'll get at least 1/2.