Answer:
15.2 people/km²
Step-by-step explanation:
Divide the number of people by the number of square kilometres.
45.6/3 = 15.2 people/km²

which means

which in turn means the next two terms are

and

.
Answer:
d. 13
Step-by-step explanation:
a^2 + b^2 = c^2
5^2 + 12^2 = 13^2
25 + 144 + 169