Answer:
Factoring
Step-by-step explanation:




and 
Answer:
B. unit of account
Step-by-step explanation:
Accounts are kept in terms of units of account. Money serves as the unit of account when accounts are kept in terms of money.
Answer:
1. use the formula


2. use the formula

3. There is only one at 360 degrees
4. there are 6 rotational symmetries and the number of reflectional symmetries would be 6 as you can see: