Answer:
Solving for x:

Solving for y:

Step-by-step explanation:
Please see the attached picture for full solution.
Answer:
The area of a circle is pi times the radius squared (A = π r²).
Step-by-step explanation:
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We can solve this by setting up a proportion where 864/12 = 504/x. We cross multiply and get 864x = 504 * 12. So 864x = 6048. Divide by 864 on both sides, x = 7.
It would take Charlie 7 hours to drive 504 miles.