# Mathematics: Post your doubts here!

Discussion in 'International A And AS Level' started by XPFMember, Sep 8, 2011.

1. ### insharah

Messages:
17
22
Trophy Points:
13
Gender:
Female
Location:
QATAR
find the range of f(x)=3-4cos^2 x

3. ### Thought blocker

Messages:
8,501
35,003
Trophy Points:
698
Gender:
Male
Location:
India
Domain? Post d exact question so i can collect all info
I just need domain over here though

insharah likes this.
4. ### insharah

Messages:
17
22
Trophy Points:
13
Gender:
Female
Location:
QATAR
5. ### Thought blocker

Messages:
8,501
35,003
Trophy Points:
698
Gender:
Male
Location:
India
np
So it is very simple.
Input d value of domain into d function and respective values will be d value of range.
here wen u put zero in equation u will get -1
and wen u put pi in equation u will get 3
so -1 <= f(x) <= 3 will b d answer

insharah likes this.
6. ### insharah

Messages:
17
22
Trophy Points:
13
Gender:
Female
Location:
QATAR
aaahhh it was so simple
genius you
thanks alot buddy!

Thought blocker likes this.
7. ### Thought blocker

Messages:
8,501
35,003
Trophy Points:
698
Gender:
Male
Location:
India

Messages:
525
6,285
Trophy Points:
503
Location:
who knows

#### Attached Files:

• ###### 20170826_203302.jpg
File size:
3.7 MB
Views:
16
Hasnain the rocker and Emmris like this.
9. ### Emmris

Messages:
922
4,573
Trophy Points:
253
Gender:
Female
Location:
Somewhere ...... leave me alone .....
(i) (6 3/4 ) / (3/8) = 18 classes
(ii) 3/8 * 28 = 10 1/2 kg
(iii) 10 1/2 - 6 3/4 = 3 3/4 kg
(iv) 3/8 * 15 = 5 5/8 kg
(v) 6 3/4 - 5 5/8 = 1 1/8 kg

10. ### Emmris

Messages:
922
4,573
Trophy Points:
253
Gender:
Female
Location:
Somewhere ...... leave me alone .....
Hope it helps

Messages:
525
6,285
Trophy Points:
503
Location:
who knows
Thanks!
Only one ans is wrong otherwise everything's correct

Emmris likes this.
12. ### Emmris

Messages:
922
4,573
Trophy Points:
253
Gender:
Female
Location:
Somewhere ...... leave me alone .....
Oh sorry ...is it the last part dat is incorrect ....

Messages:
525
6,285
Trophy Points:
503
Location:
who knows
Nope its the first one..
No need to be sorry lol. You helped and that was really kind of you

Emmris likes this.
14. ### Emmris

Messages:
922
4,573
Trophy Points:
253
Gender:
Female
Location:
Somewhere ...... leave me alone .....

Messages:
525
6,285
Trophy Points:
503
Location:
who knows
9/14

Emmris likes this.
16. ### Emmris

Messages:
922
4,573
Trophy Points:
253
Gender:
Female
Location:
Somewhere ...... leave me alone .....
Ah OK I just had 2 express it as a fraction ....

17. ### Ayesha Asif333

Messages:
918
2,186
Trophy Points:
253
18. ### krishnapatelzz

Messages:
254
121
Trophy Points:
53
Gender:
Male

Thought blocker and Emmris like this.
19. ### Lee Qian Yi

Messages:
23
2
Trophy Points:
3
Gender:
Female
A die is biased so that the probability that is shows a six on any throw is p. The experiment is repeated and another 97% confidence interval is found. Find the probability that exactly one of two confidence intervals includes the true value of p. ANS :0.0582 How to do ?

20. ### Thought blocker

Messages:
8,501
35,003
Trophy Points:
698
Gender:
Male
Location:
India
It must be twice the value of 0.03 times 0.97

Messages:
23