Mathematics: Post your doubts here!

[bluefa1con]

kindly i need help in 2011 21 question 16
The diagram shows a square of side k
The circle inside the square touches all four sides of the square.
A) The shaded area is A cm"2
show that 4a=4k"2-k"3.142"2
3.142 is a value of pie
"2 mean square

this one is really easy

Area of whole sq= k2
area of the circle= pie(k/2)sq
so if you take square of k/2 it become k*sq*/4

so
A=k*sq*-pie(k)*sq*/4
multiply every term by 4 so you get rid of denominator
4A=4k*sq*-pie(k)*sq*

i am going to sleep now but you guys better post shit load of questions till morning

 

[IISScientists]

Assalamu Alikum.
This question is from As level.
When do i take pi as 180. Refering to past paper 9709/11/m/j/10. Question 5.

 

[anooshraja]

A rectangular photograph measures 23.3 cm by 19.7 cm, each correct to 1 decimal place.
Calculate the lower bound for
the perimeter and the area.
http://www.xtremepapers.com/papers/...cs (with coursework) (0581)/0581_w02_qp_2.pdf question 12

 

[Hamzeh S]

guys when i need to calculate the bearing there are 2 angles which are always equal which ones ?? :/ i know that 180-x = x on the otherside but anything else ?

 

[MERIHAN]

i want help in this question

f(x) = 10 ^x (10 to the power x)

find f inverse(1) .........................i am finding hard to write here .. its actually nov 05 paper2 Q7 (b)

 

[WSK]

Grade 10 lol. Doing my final IGCSE this year.

The Answer is Wrong
F(x)=5-3x
5-3x=y
y-5=-3x
y-5/-3 = x

 

[Starbucks.]

Tuesday!,!! I will be writing my math paper 2!!! What abt u guys?

 

[natsume hyuga]

this is w11 qp 21 # 11(b)
how do we solve this (without a calculator)
actually i have no idea how to do it at ALL

isnt that the inverse?

 

[kboss]

hey, is Casio fx-991 Es allowed in exam...the exam is on tuesday so urgent answer needed.

 

[Razo513]

ive got a couple of questions so plzzzz people help me out!!
ok first one ) can someone plz explain for me how to do this briefly?

the second one is in a) they ask for the area then in letter b) they mention that the answer in a) was the circumference ???? so what am i supposed to find ?

after calculating the distance=area undergraph which is 130 m what should i do?? to find the max speed ??
i tried doing the speed = distance/time which is 130/16 = 8.125 but that wasnt the right answer

now the last one im stuck on b)

THANK U in advance to whoever helps me in this

 

[Razo513]

hey, is Casio fx-991 Es allowed in exam...the exam is on tuesday so urgent answer needed.

yes it's allowed but before u enter remove the outer cover

 

[bluefa1con]

Assalamu Alikum.
This question is from As level.
When do i take pi as 180. Refering to past paper 9709/11/m/j/10. Question 5.

sorry but this thread is for igcse maths

 

[bluefa1con]

i want help in this question

f(x) = 10 ^x (10 to the power x)

find f inverse(1) .........................i am finding hard to write here .. its actually nov 05 paper2 Q7 (b)
View attachment 8456

f in verse is log(base10)X
take x as 1 answer will be zero
because anything with the power zero answer is 1

 

[Zeerik]

x – 5y = 0
15x+10y=17

Solve!?

 

[Dug]

x – 5y = 0
15x+10y=17

Solve!?

x=5y
15(5y) +10y = 17
85y=17
y=17/85
x=5(17/85)
x=1

 

[bluefa1con]

ive got a couple of questions so plzzzz people help me out!!
ok first one ) can someone plz explain for me how to do this briefly?
View attachment 8472

part a sin(x)= cos(x)
the point where graph intesect
part b
take a point on graph were the sin x and cos x are 0.5 points apart

the second one is in a) they ask for the area then in letter b) they mention that the answer in a) was the circumference ???? so what am i supposed to find ?
View attachment 8473

area of grass is pie 8 sq
45/360 * 2pie12
multiply this answer by 4 to get answer for all 4

after calculating the distance=area undergraph which is 130 m what should i do?? to find the max speed ??
i tried doing the speed = distance/time which is 130/16 = 8.125 but that wasnt the right answer
View attachment 8474

distance is same the graph is a triangle
so 1/2*16*h=130
solve this to get the height which in this case is the max speed

now the last one im stuck on b)
View attachment 8475
THANK U in advance to whoever helps me in this

join C with the radius of other circle shown
you will have a right angled triangle
use Pythagoras Theorem
OC is the hypotenues
and the other side will be 2cm (6-4)
so under-root(OC)sq - 2sq

more questions!!!!!!!!!!!
trying my best to prepare for distinction

 

[bluefa1con]

hey, is Casio fx-991 Es allowed in exam...the exam is on tuesday so urgent answer needed.

cie only restricts graphical calculators because u can store data and formulas in them
other than that every calculator is allowed
i had additional mathematics exam in november and i did use 991 ES they just asked me to remove the back cover

 

[Zeerik]

??

 

[bluefa1con]

??

360-(66+90+120)
next part
90/360 *60

 

[Razo513]

THANK U SOOOOOOOOOOOOOO MUCH I RLLY APPRECIATE UR HELP