<span>it is the letter b because if you count closly you will see
</span>
Perimeter = 18 miles
Perimeter = 2a + 2b
2a + 2b = 18
a = ?
b = 7
18 = 2a + 2*7
18 = 2a + 14
2a = 18 - 14
2a = 4
a = 2
Area = a * b
Area = 2 * 7 = 14 miles2
<span>$ 3,450.00
</span>Equation:
A = P(1 + rt)