Under a dilation, triangle A(0,0), B(0,3), C(5,0) becomes triangle A′B′C′. The scale factor for this dilation is 3.

What is the length of A′B′, in inches?

12? I have looked at khan academy videos and still don't understand it. Please help me!

so is it 9? I was confused about what to add

It would be nice if Damon would respond

The distance from A to B is three

expand that (scale up or dilate it) by a factor of 3
3 * 3 = 9 not 12
sorry, disagree with your answer sheet.

It would be nice if someone would help us and give us the right answer.

It's 15.

im lost

okay but what if the dilation was 4?