Mathematics: Post your doubts here!

[Usman Abdul Jabbar]

Question:

The number of fish on a farmincreases by approximately 10% each month. If there were originally 350 fish, calculate to the nearest 100 how many fish would there be after 12 months ?
(Question from IGCSE Mathematics by Hodder Education 3rd Edition)

Guys I got an answer with round off of 800 but in the answers it has 1100 please tell me why is it 1100.

My solution:
so after my calculation each month 35 fish increase so the number of fish were originally 350 so
35 x 12 = 420 + 350= 770

Thanks

Any answers I have'nt got my answer.

 

[***amd***]

it is actually, each month it increases by 10% of the previous month, not 10% of 350.

that makes...
[(110/100) ^12] *350

 

[***amd***]

Hello. I need help understanding May June 2010 q-41 question 7 c i) and ii)
Thanks in advance.
Link:
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s10_qp_41.pdf

Hello. I need help understanding May June 2010 q-41 question 7 c i) and ii)
Thanks in advance.
Link:
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s10_qp_41.pdf

i) see, the triangle is an isosceles triangle so all its angles measure 60.
angles between tangents and radii are always 90.
so ECD + 90 + 90 + 60 = 360
ii)
its simple that arc length = (angle of the arc/360) * 2 * pi * r
so, DE = 120/360 * 2 * pi * 31
hope you got it

 

[Awesome12]

View attachment 38081


i) see, the triangle is an isosceles triangle so all its angles measure 60.
angles between tangents and radii are always 90.
so ECD + 90 + 90 + 60 = 360
ii)
its simple that arc length = (angle of the arc/360) * 2 * pi * r
so, DE = 120/360 * 2 * pi * 31
hope you got it

An isosceles triangle does not have all of its angles equal to 60. That is an equilateral triangle

 

[***amd***]

An isosceles triangle does not have all of its angles equal to 60. That is an equilateral triangle

oh yes. actually i had to type this answer 4-5 times .-. coz of my bloody internet ._. isi liye bhool gya.

 

[Awesome12]

View attachment 38081


i) see, the triangle is an isosceles triangle so all its angles measure 60.
angles between tangents and radii are always 90.
so ECD + 90 + 90 + 60 = 360
ii)
its simple that arc length = (angle of the arc/360) * 2 * pi * r
so, DE = 120/360 * 2 * pi * 31
hope you got it

i) There is another way to solve it ; a much easier way
A circle property was that (in this case)
ECD + 60 =180
ECD = 120

 

[***amd***]

i) There is another way to solve it ; a much easier way
A circle property was that (in this case)
ECD + 60 =180
ECD = 120

-.-
DE + 90 + 90 + 60 = 360
DE + 60 = 360 - 90 - 90
DE + 60 = 180
-.- isnt it same thing dude?

 

[Awesome12]

-.-
DE + 90 + 90 + 60 = 360
DE + 60 = 360 - 90 - 90
DE + 60 = 180
-.- isnt it same thing dude?

What is the definition of ANOTHER?
Too many numericals can confuse them

 

[***amd***]

What is the definition of ANOTHER?
Too many numericals can confuse them

knowing the basics of formulas is better than cramming them

 

[Ahmad Sammy]

View attachment 38081


i) see, the triangle is an isosceles triangle so all its angles measure 60.
angles between tangents and radii are always 90.
so ECD + 90 + 90 + 60 = 360
ii)
its simple that arc length = (angle of the arc/360) * 2 * pi * r
so, DE = 120/360 * 2 * pi * 31
hope you got it

Thanks a lot, got it!

 

[Awesome12]

knowing the basics of formulas is better than cramming them

Cramming them is not what I did. Writing in bulk creates a very bad perspective and 'intimidation of reading too much' from a psychological point of view

 

[***amd***]

Cramming them is not what I did. Writing in bulk creates a very bad perspective and 'intimidation of reading too much' from a psychological point of view

blah blah blah .-. u won the argument.

 

[princess sofia]

plz help have exam tommorow
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w11_qp_22.pdf
Q19 part c
thnx in advance

 

[***amd***]

plz help have exam tommorow
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w11_qp_22.pdf
Q19 part c
thnx in advance

ABC is right angled isosceles triangle, that means AB = BC
let base of triangle = AB
and let its height be BC that is = AB

so (1/2) * AB * AB = 6.5
simplify it

 

[Ahmad Sammy]

plz help have exam tommorow
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w11_qp_22.pdf
Q19 part c
thnx in advance

You could calculate its length by using Pythagoras theorem:
Hypo^2 = Base^2 + Perp^2 (height in the diagram)
x = √3^2 + 2^2
x = √13
x = 3.605
x = 3.61

Hope I explained it easily

 

[princess sofia]

ABC is right angled isosceles triangle, that means AB = BC
let base of triangle = AB
and let its height be BC that is = AB

so (1/2) * AB * AB = 6.5
simplify it

thnx missed da word issosceles while reading da question

 

[princess sofia]

You could calculate its length by using Pythagoras theorem:
Hypo^2 = Base^2 + Perp^2 (height in the diagram)
x = √3^2 + 2^2
x = √13
x = 3.605
x = 3.61

Hope I explained it easily

thnx got it

 

[Dubi Pro]

after trying alot cant do it! PLEASE any one help me with this?

only the (e) part.

i gueess theres any formula also?

actual map dist/map distance * (scale)^2

 

[***amd***]

after trying alot cant do it! PLEASE any one help me with this?

only the (e) part.

i gueess theres any formula also?

actual map dist/map distance * (scale)^2

its really simple, no squaring and stuff.
just, 4.5/HP = 1/n

temme if u really get your answer

 

[Dubi Pro]

its really simple, no squaring and stuff.
just, 4.5/HP = 1/n

temme if u really get your answer

no bro dint get :S

see this is the formula worksheet here whats this useed for then