2,7) is the answer to this question
Answer:
B. 
Step-by-step explanation:
The product of the ratioal expressions given above can be found as follows:

Multiply the denominators together, and the numerators together, separately to get a single expression



The product of the expression
= 
The answer is B.
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:

Answer:
x = 8, y = 2
Step-by-step explanation:
Multiply the second equation by -2:
x + 6y = 20
-2x - 6y = -28
Add the equations and simplify:
-x = -8
x = 8
Plug x = 8 back into the first equation and solve for y:
8 + 6y = 20
6y = 12
y = 2