Help me quick! my exam is tomorrow!?!?!

[Alex Penge]

Can someone please help me on these two questions from the AQA paper. I do not understand them I would be extremely greatful if someone explains how they got the answer too.

Thanks

Alex


http://img119.imageshack.us/my.php?image=help7ck.jpg

[Unregistered]

Take the number of people from the sample under 148cm tall - 2
Divide 450 by 15 - 30
Times 2 by 30 - 60

Not too sure on the other question but hope that helps

[Alex Penge]

Thanks mate. I just worked it out earlier got 60 so I'm happy :D

Can someone give me the answer and solution for question 2 please off that picture :)???

[Complex]

The solution to
x-6x-3=0

Use the quadratic formula
x=[-b±√(b-4ac)]/2a

where a=1, b=-6 and c=-3
x=[6±√(-6)-4(1)(-3)] / 2
x=[6±√(48)] / 2
x=[ 6±√(16x3)] / 2

x= [6±√16√3)] / 2
x= 6±4√3) / 2
divide each term by 2
x=3±2√3


Hope this helps

Good luck 4 tomorrow

[Alex Penge]

The solution to
x-6x-3=0

Use the quadratic formula
x=[-b±√(b-4ac)]/2a

where a=1, b=-6 and c=-3
x=[6±√(-6)-4(1)(-3)] / 2
x=[6±√(48)] / 2
x=[ 6±√(16x3)] / 2

x= [6±√16√3)] / 2
x= 6±4√3) / 2
divide each term by 2
x=3±2√3


Hope this helps

Good luck 4 tomorrow


Oh yeah!! THE QUADRATIC FORMULA 'cos it = 0 am I right?