Line B
Explanation:
The slope is negative so the line is going to the left. The y-intersect is 1.
Answer:
680
Step-by-step explanation:
Use the binomial coefficient where you choose
numbers out of
possible numbers and find the total amount of combinations since order does not matter:

Thus, you can make 680 three-non-repeating-number codes
Answer:
1st is valid 2nd is not valid
Step-by-step explanation: