Maths, Addmaths and Statistics: Post your doubts here!

[Saad Mughal]

Hey even i got k=1/4pi

The answer's probably wrong.

 

[Ashna Mungla]

The one in the marking scheme or mine??

 

[Suchal Riaz]

it is a typical calculus question, nothing fancy involved. so we all can not be wrong. if it was a permutation question would have said that we are wrong. so we have finally arrived at the conclusion that MS IS WRONG!

 

[Suchal Riaz]

The one in the marking scheme or mine??

ms

 

[Ashna Mungla]

Ah ok

 

[Ashna Mungla]

Oops exponential functions killing me plz help
i dont known anything in thia chapter

 

[Saad Mughal]

Oops exponential functions killing me plz help
i dont known anything in thia chapter

What in it?

 

[Ashna Mungla]

i have understand nothing in the chapter

 

[Saad Mughal]

You're talking about the differentiation chapter of exponential, right?

 

[Ashna Mungla]

no the chapter of logarithmic and exponential functions itself
solving of exponential functions

 

[Saad Mughal]

Oh, you mean indices. It's easy.
Just remember the laws.
(i) When the same base with powers are multiplied, their powers add,
a^2*a^3=a^5
(ii) When the same base with powers are divided, their powers are subtracted,
a^3/a^2=a^1
(iii) When a whole square is around the base, the powers multiply,
(a^3)^2=a^6
(iv) Sq.root means power multiplied by 1/2, Cube root means power multiplied by 1/3 and so on.
(v) Power 0 means the number = 1, ex. a^0 = 1
(vi) Negative power becomes dividend, ex. a^-2 = 1/a^2

In the attached document, see the laws of logarithms and indices, just remember them and use them to solve your questions.
Just remember that ln is a logarithm with base e, therefore ln e = 1
Similarly, ln y=x can also be written as e^x=y.
Similarly, all the rules of logarithms apply to the ln.

 

[mohdumar]

Does anybody have the older Question Papers and Mark Schemes of Add Maths and Maths D from the Years 1980 to 2002? I need these urgently. could anybody help me plzzzzzzzzzzzz. Thank you in advance.

u wont get them on the net - must buy CLASSIFIED by redspot

 

[Saad Mughal]

but f***** exam report says only few students got this right!!!

That's the problem! It says that the students applied the range incorrectly!

 

[mohdumar]

Okay we can safely assume that this wont happen again in this session

That's the problem! It says that the students applied the range incorrectly!

 

[Saad Mughal]

That's what I'm hoping for!
Besides, I've tried putting the whole equation with the range in the integral function of my calculator, still the same answer!

 

[Ashna Mungla]

Oh, you mean indices. It's easy.
Just remember the laws.
(i) When the same base with powers are multiplied, their powers add,
a^2*a^3=a^5
(ii) When the same base with powers are divided, their powers are subtracted,
a^3/a^2=a^1
(iii) When a whole square is around the base, the powers multiply,
(a^3)^2=a^6
(iv) Sq.root means power multiplied by 1/2, Cube root means power multiplied by 1/3 and so on.
(v) Power 0 means the number = 1, ex. a^0 = 1
(vi) Negative power becomes dividend, ex. a^-2 = 1/a^2

In the attached document, see the laws of logarithms and indices, just remember them and use them to solve your questions.
Just remember that ln is a logarithm with base e, therefore ln e = 1
Similarly, ln y=x can also be written as e^x=y.
Similarly, all the rules of logarithms apply to the ln.

^^^Thank you^^^

 

[Saad Mughal]

 

[sweetiepie]

Q. Draw the graph of the linear function y = 6x - 2
Q. Convert the following binary number in decimal
110.111
Q.In How Many years a sum of Rs 3000 would amount Rs 6130.43 at 6 % compound quarterly?
Q. Find the amount of Rs 250 invested at the end of each of 5 successive years at 6% interest compounded annually ?
Q. Solve the following equation by using Quadratic formula :
y2 / 2 - Y / 6 = 1/ 12

Q. The Price of petrol in 1990was Rs 40 per litre. Now it has been increased to Rs 58 per litre What is the percentage of increase?

A 14.5 %
B 1.45 %
C 4.5 %
D 45 %

Answers Needed With All Steps As Soon As Possible ???

 

[Saad Mughal]

Q.1, For the graph, just take 4 arbitrary values, take x=-2, x=0, x=2, x=4 and choose an appropriate scale and extend the line.
Q.4, For first year, Amount = 250 + 250*6/100 = Rs. 265
For second year, Amount = 265 + 265*6/100 = Rs. 280.9
For third year, Amount = 280.9 + 280.9*6/100 = Rs. 297.75
For fourth year, Amount = 297.75 + 297.75*6/100 = Rs. 315.615
For fifth year, Amount = 315.6 + 315.6*6/100 = Rs. 334.55
Q.2, The answer is 6.7 (used a converter) I think but this is not in our syllabus!
Q.3, It's pretty long, we haven't done quarterly compound interest, but it can be done in the same way as Q.4.
Q.6. Percentage Increase = 58-40/40*100 = 18/40 * 100 = 45%
Option D is the answer.
Q.5, y^2/2 - y/6 = 1/12
3y^2 - y = 1/2 (by lcm)
6y^2 - 2y - 1 = 0
Using quadratic eq.,

 

[sweetiepie]

Q. Which of the following equation is linear equation ?
A. 3 y=0
B -x2+3x + 10 + 0
C 2x + 3xy- 5y = 0
D x(x2-2x4) = 25x + x3 + 30