Suppose josh drives the 45 miles from appleton to berwyn at the constant speed of 30 miles per hour. on the return trip, he drives from berwyn to appleton at the constant speed of 60 miles per hour. (a) what is josh’s average speed for the drive from appleton to berwyn and back? (b) what is the average of josh’s speeds driving from appleton to berwyn and from berwyn to appleton?

1) c 2143.6 cm

2) c 113.0 m

3) a 33.5 ft

4)   d 2 cm

5) c 20 mm

6) 180 in

7) d 120 ft

in counting the number of heads in 4 coin flips, the probability that we get exactly one head is the probability that we get anyone of the following 4 outcomes: httt, thtt, ttht, or ttth. each has probability 1/16, so the probability to get exactly one head in 4 flips is 1/16 + 1/16 + 1/16 + 1/16 = 4/16 = 1/4.