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i think it is 2/5 once simplified

simply take the ratio of sides of image and preimage :
\[\large \dfrac{7.5}{3}\]

yes , I did and simplified I got 2/5

I did the 7.5/3...3/7.5...becomes 2/5

you did it in reverse

7.5/3 should be 5/2

\[\large \dfrac{7.5}{3} = \dfrac{75}{30} = \dfrac{5}{2}\]

just a convention
always put the "image" side on top

ok... so i need to go back and fix the other as well then or it will be incorrect?.

whats your answer for the other one with quadrilateral ?

simplified 3/4.... but that was doing the switching thing bc I originally had 4/3

3/4 is correct.

no wait, in the first question, the bigger triangle is image, yes ?

let me reread it

it reads as if the ABC is the original and the other is the dilation

if it is image on top the the first would be 12/9 simplified to 4/3

|dw:1433344043799:dw|

kk

Image = final picture after dilation
preimage = original picture before dilation

and the image or original is the numerator the copy the denominator right?

again, image is final picture after dilation

preimage is original picture before dilation

no I said it wrong meant to say it the other way... now I am confusing myself...lol

for first question 5/2 is correct
for second question 3/4 is correct

actually scaale factor = pre-image/image makes more sense

and always put the original on top and copy on bottom right?

always put image on top
original on bottom

you just need to do couple of problems before seeing why it makes sense

this trips everyone in the start, things will make sense by practice eventually

tyvvm!