Answer:
Common ratio = -8
Step-by-step explanation:
The US: 300m World: 9b Most accurate: B
300m•20=6b population
B is the most accurate
For this case we must resolve the following expression:
We have to:

The base change rule can be used if a and b are greater than 1 and are not equal to x.
We substitute the values in the base change formula, using 

Answer:
-4
Option A
Zx because letters always have to line up woth each other c is place z and a is place x (i loved this unit )
Answer:
.006453
Step-by-step explanation:
6.453 x 10^-3
Move the decimal 3 places to the left since the exponent is negative
006.453
.006453