A new dad calls 4 people within 10 minutes of his son’s birth to pass along the news. Each person he called passes along the news to 4 new people within 10 minutes, and so on. How many total people have heard the news in 1 hour? *Use the geometric series formula!

Sum =  

Two people start from the same point. One walks east at 3 mi/h and the other walks northeast at 2 mi/h. how fast is the distance between the people changing after 15 minutes?

Which equation could be used to calculate the sum of the geometric series?

1/3 + 2/9 + 4/27 + 8/81 + 16/243?

2. About 10% of all people are left-handed. Suppose we take an SRS of twenty people. We assume that whether each person is left-handed or right-handed are independent events. a. What is the probability that a quarter of the people in our sample are left-handed