A postulate isn't required to be proven
Answer:
C. 15
Step-by-step explanation:
The following proportional can be set-up for the figure given:

Solve for x


Cross multiply


15 = 6x - 5x
15 = x
x = 15
Answer:
Answer 1. 5 Answer 2. 60 Answer 3. 37
Step-by-step explanation: