The answer is the first one.
Knowing that population density is like a rate, people per a given area, you would take the amount of people and divide by the area.
3.11E7/7.69E6 = 4.02 people per km squared.
Also the “E” is another way to write times 10 to a power and I recommend using that notation when plugging it into a calculator.
X=-4 is the answer because all of the points of the line are x=-4
Answer:
21.25
Step-by-step explanation:
diagonal is 21.25
the area is 216.75
the perimeter is 59.5
Answer:



Step-by-step explanation:
We are given the following recursive formula:

And consider 
a2

a3

a4

Okie, so percent decrease is the amount loss divided by the original number and multiplied by 100 to find the percent. This is because you are finding the amount loss in terms of the total amount - percent basically.
The amount loss : 4 feet
4 feet/ 12 feet = .3333 (ratio of how much cut) multiply by 100 --> 33.3% decrease. From 12 feet to 8 feet is a 33.3 % decrease. I hope this helps :-)