Answer:
Part A) The scale factor is equal to

Part B) Is an enlargement
Explanation:
we know that
The scale factor is equal to divide the corresponding side of the resulting triangle by the corresponding side of the first triangle
Let
z----> the scale factor
x------> the corresponding side of the resulting triangle
y-----> the corresponding side of the first triangle
so

we have


substitute

Remember that
If the scale factor is greater than one------> is an enlargement
If the scale factor is less than one------> is a reduction
In this problem
-------> is an enlargement