For this case we have that by definition, the perimeter of a circle is given by:

Where:
r: It is the radius of the circle.
According to the figure, it is observed that the radius of the circle is 2. Then:

Let's remember that we have a quarter circle:

We round and we have that the correct option is 
Answer:
Option A
The attached figure is the image that completes the question
Answer:
Answer:160 miles
Explanation:
You can work out this type of question by using the 'unitary' method, which means finding out how much for ONE.
If you set out the steps with short sentences it will be clearer.
On 15 gallons, a car can travel 400 miles÷15↓
On 1 gallon, a car can travel 400÷15=262
miles
Once you know the distance travelled on 1 gallon of fuel, you can work out the distance travelled for any number of gallons.
On 6 gallons the car can travel
6
×
26
2
3
miles.
(6 times further than on 1 gallon)
6
×
80
3
=
160
miles
Step-by-step explanation:
Answer:
3.7 Miles
Step-by-step explanation:
Add all of the miles, then subtract it by 20.
Total population of US is 234.88 million.
Step-by-step explanation:
Given,
Number of people are 65 or older = 30.3 million
This represents 12.9% of total population.
Let,
x represent the total population.
12.9% of x = 30.3 million

Dividing both sides by 0.129x

Total population of US is 234.88 million.
Keywords: percentage, division
Learn more about percentage at:
#LearnwithBrainly
Factor each completely 3r^2+7r
r(3r+7)