Answer:

Step-by-step explanation:
To solve this, you would just substitute 4 in for the x.

Answer:
3.14
Step-by-step explanation:
because its diameter that is 2, you divide it in half which should be one, that will be the radius. to get the area from the radius you multiply it by its self and multiply that by 3.14 which is the circumference of a circle.
The papers are to blurry hard to read cdn you repost them
Answer:
78cm
Step-by-step explanation:
d = 10
area of a circle = πr^2
22/7 × 5 × 5
78.5cm
Step-by-step explanation:
This sequence is that you should multiply the number by 4 and one number should be positive the other should be negative so
5 -20 80 -320 1280