A possible answer is

.
Pi is an irrational number and when you multiply a rational number with an irrational number, you end up with an irrational number.
Answer:
The equation does not have a variable
Step-by-step explanation:
6=?-8
Answer: The equation does not have a variable to solve for x
Hope this helps.
The x-intercept is 8
the y-intercept is -10
The answer to your question would be $18
614.40 because 204.80 divided by 4 is 51.20 and 51.20 multiplied by 12 is 614.40