Answer:

Step-by-step explanation:
Diameter of the circle=

Circumference of a circle:


Area of the circle:


Answer:
14 and 21
Step-by-step explanation:

Answer:
8.4 * 10^6
Step-by-step explanation:
8.4 * 10^6
1 million = 1 * 10^6
8 million 4 hundred thousand is 8.4 * 10^4 because this number is 8.4 times bigger than a million.