Answer:
Step-by-step explanation:
The sum of the interior angles of a polygon with n side is

So, for a polygon with 5 sides the expression is

Answer:
11/12
Step-by-step explanation:
6 feet because 8 / 12 reduces to 2 / 3 and you multiply 2 times 3
$21.45 x 6 = $128.7
$128.7 + $10.60 = $139.3
Charlie will have saved $139.3 in 7 months