IGCSE MATHS Doubts

[Fastal]

58

can you tell me why please??

[Malak]

Nov 09 Q 4 & 14 http://www.freeexampapers.us/IGCSE/Maths/CIE/2009%20Nov/0580_w09_qp_22.pdf

Thx alot

[Shazizzzle]

can you tell me why please??

DCA = DAT (Alternate Segment Theory)

If DAO = 32, DAT = 90 - 32 = 58.

So, DCA = 58.

[Dibss]

58

can you tell me why please??

hey, I'm assuming you know the alternate segment theorem which says the angle between a tangent and a chord drawn form the point of contact is equal to any angle in the alternate segment.
in your qs, DAT will be equal to any angle subtended by line AD in the opposite segment. therefore angle DAT=ACD=58 :]

[Shazizzzle]

Nov 09 Q 4 & 14 http://www.freeexampapers.us/IGCSE/Maths/CIE/2009%20Nov/0580_w09_qp_22.pdf

Thx alot

Umm, separate the coeffecients from the variables.

i.e First do 5/8 /  1/2
=5/8 X 2/1 (reciprocal of 1/2 taken when introducing multiplication)
=10/8
1/1/4.

Then the variables.

x^3/2  /  x^-5/2
=x^ 3/2 - (-5/2)
=x^3/2+5/2
=x^8/2
=x^4

So, Answer: 1/1/4x^4

[Dark Prince]

its vertically left.

Sorry to ask this again......but i still dont get it hoe is it moving to left...thnkx

[Fastal]

hey, I'm assuming you know the alternate segment theorem which says the angle between a tangent and a chord drawn form the point of contact is equal to any segment in the alternate segment.
in your qs, DAT will be equal to any angle subtended by line AD in the opposite segment. therefore angle DAT=ACD=58 :]

Thank You

+rep

[Dibss]

Nov 09 Q 4 & 14 http://www.freeexampapers.us/IGCSE/Maths/CIE/2009%20Nov/0580_w09_qp_22.pdf

Thx alot

14:
P(1+R/100)^T
249(1+1.7/100)³
=261.92
Interest =261.92-249 =12.92

Fastal, you're welcome :]

[Fastal]

Sorry to ask this again......but i still dont get it hoe is it moving to left...thnkx

i dont get it either

[haris94]

Nov 09 Q 4 & 14 http://www.freeexampapers.us/IGCSE/Maths/CIE/2009%20Nov/0580_w09_qp_22.pdf

Thx alot

Q 4)  whenever it is division, u hv to subtract the powers
so 3/2 - (-5/2) = 4
and (5/8)/(1/2) is equal to 5/4 or 1.25

so answer is 1.25x⁴

[haris94]

Nov 09 Q 4 & 14 http://www.freeexampapers.us/IGCSE/Maths/CIE/2009%20Nov/0580_w09_qp_22.pdf

Thx alot

Q 14)
A = P(1+r/100)ⁿ

A = 249(1+1.7/100)³

A = $261.92

interest = A-P
261.92-249
$12.92

[haris94]

i dont get it either

from the x-axis u need to move -1 to reach the triangle

this is what i think
if from the x-axis u need to move left, then factor is in -ve
if u move right, factor will be a +ve number

[33oomar]

what is the rule for compound intrest please no symbols full words

[Shazizzzle]

from the x-axis u need to move -1 to reach the triangle

this is what i think
if from the x-axis u need to move left, then factor is in -ve
if u move right, factor will be a +ve number

This is all crap.

It's clear that if y-axis is the invariant line, up (right, if y-axis is brought horizontal) is +ve, down is negative.
If the x-axis is the invariant line, right is positive and left negative.

People say it's related to the quadrant the shear was in.

The only explanation is that CIE made a mistake and was too lame to admit it, even in the ER, therefore defended the answers WITHOUT GIVING A CLEAR EXPLANATION TO WHY IT WAS -ve.

Also, the principal examiner, has expressed how he would like to reduce graph and transformation questions as they are easy, and replace them with difficult investigating, sequence and probability questions.

As transformation showed up in Nov 2009, is it unlikely to show up this year.

Also, that question was from Paper 4.
We've got Paper 2 tomorrow. Chillax.

[The Hitman]

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