the scale factor was 2.25
so you just do

y^2 = x^2 / 2.25^2

which is =

y^2 = x^2 / 5.0625

then you square root that so you get

y= √(x / 5.0625)

isnt that right? what'd you do?

Reply 30

sphintus

there was an inequality question too. values were -2, -1, 0, 1 ,2

for the question with two similar shapes, first answer was 16.25cm
second answer was 2cm

and the question of functions,
f(0.5) = 0.2
ff(-1) = 0.2
inverse of x / 3x+1 = -3x + 1

thats all i can remember from my answers

Reply 31

hussain_kalash

Where did you get 4/9 from? Isn't the scale factor 2.25?

Reply 32

mirah01

Original post by hussain_kalash

Where did you get 4/9 from? Isn't the scale factor 2.25?

There's a formulae you use for these type of questions it's
Area1/area2=lenght1^2/lenght2^2

Reply 33

mirah01

Original post by mirah01

There's a formulae you use for these type of questions it's
Area1/area2=lenght1^2/lenght2^2

It's essentially the same thing your saying. Just a different method - he did 4/9 and y/y+x
But if you do 9/4 you get 2.25 which is your scale factor

Are there any more questions?

Reply 34

mirah01

What did you get for the histogram question?

Reply 35

hussain_kalash

Original post by mirah01

What did you get for the histogram question?

I think it was 35, Not really sure though i don't remember

Reply 36

Luke Collinson

I looked at the unofficial mark scheme, and I think I got 77/100. I asked my Maths teacher and he said if I get that again in the calculator paper, then I'll get an A!

Reply 37

hussain_kalash

Original post by Luke Collinson

I looked at the unofficial mark scheme, and I think I got 77/100. I asked my Maths teacher and he said if I get that again in the calculator paper, then I'll get an A!

What are you talking about bro? this is a discussion about an IGCSE not GCSE ..

Guys can you be a bit more interactive so we can make a marking scheme out of this discussion?

Reply 38

arvana29

Original post by Luke Collinson

I looked at the unofficial mark scheme, and I think I got 77/100. I asked my Maths teacher and he said if I get that again in the calculator paper, then I'll get an A!