Answer:
C
Step-by-step explanation:
the greater than or less then symbol means at least and $425 means it has to be added in each month.

This is an exact answer. the answer will be a bit larger than 20
It is adding one little percentage of increase here. or, 1.1 each time....hope that this helps.
Answer:
7
Step-by-step explanation:
Note the factors of each number. Prime numbers are numbers that can only be factored to itself and 1. Note:
Factors of 1:
1
Factors of 3:
1 , 3
Factors of 7:
1 , 7
Factors of 9:
1 , 3 , 9
Factors of 21:
1 , 3 , 7 , 21
Factors of 63:
1 , 3 , 7 , 9 , 21 , 63