These polygons are similar. Find the value of z.
10
8
6
5

Answer:
10
Step-by-step explanation:
Find the two similar sides which are already measured.
6 and 9 are those numbers.
Use similarity proportional ratio:
6/9 = z/15
Cross multiply:
9z = 15 × 6
9z = 90
z = 90 ÷ 9
z = 10