There are 7 days in a week.
1/2 hour x 7 days = 3 1/2 hours per week.
3 1/2 hours per week x 4 weeks = 14 hours
He read for a total of 14 hours
The slope would be (3-1)/(6-4) or 1
Answer:
133
Step-by-step explanation:
an = a1 + f × (n-1)
an= 17+4 x (30-1)
an= 17+4 x 29
an= 17+116
an=133
The amount of passwords possible is:

Since he only tries once for the first try we get:

Thus there is a:

Chance he will guess the password on his first try.