First get all the terms on the same side:

Now solve using the quadratic formula which is:

Plug in the values:

So the answer is:
The absolute value is 12. I don't know how you would use the number line to your advantage but that's because that's not how they taught me in school.
Answer:
10
Step-by-step explanation:
Answer: 50.24 m2
Step-by-step explanation:
the fomlua for the area of a cuculal is
A=1/4 π d^2
so...
1/4 * π * 8^2
=50.24