Mathematics: Post your doubts here!

[Just Smie :)]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w10_qp_43.pdf
question 10

A : 20x+10y=200
b: 15 more than or equal x+y. x more than or equal 3. y less than or equal x
c: draw and shade

 

[Just Smie :)]

1.... OMG SOO SCARED i STILL DONT GET COMPUND INTEREST AND SIMPLE INTEREST

They Are Not That Difficult Just Memorize The 2 Rules And Things Would Be Easy

 

[Jisu]

um sorry i gave u da wrong link
it is question 10 of 2010
But thanx nywayz i needed help there too

 

[Just Smie :)]

um sorry i gave u da wrong link
it is question 10 of 2010

Winter Or Summer ?

 

[Jisu]

Winter Or Summer ?

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w10_qp_43.pdf

 

[always-smile :)]

my teacher told me to stop solving past papers and nw i don't knw what to do ....what's your opinion??

 

[Just Smie :)]

1.... OMG SOO SCARED i STILL DONT GET COMPUND INTEREST AND SIMPLE INTEREST

b : interest = 7500*3.5*5/100. ans : 1312.5
1312.5 + 7500 to get the total = 8812.5 that's the final answer
c : 2^2 *3 *5

 

[Lost_Life]

b : interest = 7500*3.5*5/100. ans : 1312.5
1312.5 + 7500 to get the total = 8812.5 that's the final answer
c : 2^2 *3 *5

BUT WHY?? they told you per year so what i did was i calculated the simple interest for 1 year, then i used compound interest to get it for 5 years

 

[Lost_Life]

b : interest = 7500*3.5*5/100. ans : 1312.5
1312.5 + 7500 to get the total = 8812.5 that's the final answer
c : 2^2 *3 *5

i dont get the indices
im really weak at it
like when they tell me to find x
90^x=a number

 

[Just Smie :)]

BUT WHY?? they told you per year so what i did was i calculated the simple interest for 1 year, then i used compound interest to get it for 5 years

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w10_qp_43.pdf

a : 7 8 8 10 11 16
or 8 8 8 10 10 16
b :i ) 94.7
ii just draw the histogram

 

[Lost_Life]

how do we solve question 5 a mj 2011 variant 2

 

[Just Smie :)]

i dont get the indices
im really weak at it
like when they tell me to find x
90^x=a number

It Would Require Trying Several Numbers Before you get the result :/

 

[Lost_Life]

It Would Require Trying Several Numbers Before you get the result :/

okay then, but what about my method in solving the interests

 

[Just Smie :)]

okay then, but what about my method in solving the interests

The Question Says Calculate the amount she has after 5 years. and the question said that she used simple interest so don't use the compound interest rule the problem is that u think the question is too complicated but in fact it's so easy stay relaxed and stop thinking that every question has a hidden trick in it

 

[Maz]

i dont get the indices
im really weak at it
like when they tell me to find x
90^x=a number

Or you could use the calc to find the answer.
eg. If they have given

2^x=512
you could just type this in the calc
In512/In2(Or substitute In with log)
The answer's 9.

 

[Lost_Life]

ok so when i see per year, i ignore it ??? why do we add 7500 at the end?

 

[Just Smie :)]

ok so when i see per year, i ignore it ??? why do we add 7500 at the end?

Because The Question said ( Calculate The Amount Of Money She Has After 5 Years ) Not Only The Interest. So We Add 7500 To The interest we calculated to get the total amount of money she has at the end of the years

 

[Lost_Life]

Because The Question said ( Calculate The Amount Of Money She Has After 5 Years ) Not Only The Interest. So We Add 7500 To The interest we calculated to get the total amount of money she has at the end of the years

EEEE! um..okay could you give me a link to a website were i could practice more?

 

[Lost_Life]

how do we solve this?
find the integers of n
9<3n+6<= 21

 

[Just Smie :)]

EEEE! um..okay could you give me a link to a website were i could practice more?

Actually I Always Practice In IG Exams They're Full Of Questions

Do You Know The Rules For Simple And Compound Interests ?