Answer:
all work is pictured and shown
The area of a circle is A=pi(r)^2. Since the diameter is 13, the radius would be 6.5. Doing the formula (3.14)(6.5)^2, the answer would be 132.665.
100mi(5280ft/mi)(12in/ft)($1/6.06in)=$1045544.55 (to nearest cent)