Answer:
1/3
Step-by-step explanation:
20/60 = 1/3
60 mins in the hour;
20 missed;
20/60 probability of friend calling in the missed 20 mins.
The answer is in the description.Make sure to click the link above.
The probability that it doesn't land on 4 would be 3/8. This is because theres a 5/8 chance it lands on 4 so just do the opposite which would be 3/8.
The system is
i)

ii)

The solutions to this system, are all points (x, y) for which BOTH these 2 inequalities hold.
Check the points separately:
(5, 1)
i)

True
ii)

Not True
(0, 0)
i)

True
ii)

True
(-2, -3)
i)

True
ii)

True
(2, 5)
i)

Not True
ii)

Not True
Answer: (0, 0) and (-2, -3)
Hey! Not to good at explaining this, but the correct answer is 3/5 hours, or 36 minutes.