Question

triangle z is a scaled copy of triangle y.
what scale factor takes triangle y to triangle z?

Explanation:

Step1: Find corresponding sides

Triangle Y has sides 13 and 15; Triangle Z has 11.7 and 13.5.

Step2: Calculate scale factor

Scale factor = $\frac{\text{Side of Z}}{\text{Side of Y}} = \frac{11.7}{13} = 0.9$ (or $\frac{13.5}{15} = 0.9$)

Answer:

0.9