Answer:
<h3>-700</h3>
Step-by-step explanation:

hmmm let's find the distance between B and C first off.

hmmm if BC is that much, then AB + AC = 7, since AB + AC + BC = 12 which is the perimeter, Check the picture below.
Answer:
1, 3, 10, 34....
Step-by-step explanation:
3x each number and add the previous numbers:
(1 x 3) + 0= 3
(3 x 3) + 1 = 10
(3 x 10) +3 + 1 = 34