Hello,
To find the scale factor, we have to look at what's going on in the problem.
In point A, we are converting from (5, 3) to (7.5, 4.5).
We can write and solve equation to find the change (scale factor)
5x = 7.5 and 3x = 4.5
If you solve either equation, you will find the scale factor is 1.5.
Good luck,
MrEQ
Then
which is a disk of radius 1, hence with area 
.
there's not enough information to solve
24/8 = 3
3x3 = 9
5x3=15
so
<span> 24 in ratio 3:5 = 9:15</span>
