I would say 18 because 790-610= 180 and 180÷10= 18
Answer:
The answers is "
Option B".
Step-by-step explanation:

Where,
predicted value of lead content when traffic flow is 15.


Calculating thet-critical value
The lower predicted value 

When
of CI use as the expected lead content:

It will be 75$ i guess the question is a bit wrong please recheck
Answer:
(-2,5)
Step-by-step explanation:
25.12 is the answer !!!!!!