Answer:
8000
Step-by-step explanation:
top: 20 * 2 / 2 *40 = 800
bottom: 20 * 40 * 9 = 7200
add
\[\sum_{n=1}^{7} 2(-2)^{n-1}\]
11. 1506.5
12. 3.2inches on the map
7 stamps* ($2.20/ 5 stamps)= $3.08.
(Note that the unit cancels out so you get the answer)
The final answer is $3.08~
