Answer:
m<BEC=80º
Step-by-step explanation:
a line is 180º total
180-70-30=80
It was would numbers 000-000-0000 through 999-999-9999. So that would be 9,999,999,999 + 1 = 10 billion different 10-digit phone numbers.
Answer:
four
Step-by-step explanation: