Answer:
The anwers is D
Step-by-step explanation:
Answer:

Step-by-step explanation:
We have been given that there are 4 red marbles and 7 blue marbles and 5 yellow marbles in a bag. Monica will randomly pick two marbles out of the bag replacing the first marble before picking the second marble.
Since Monica will replace the first marble before picking the second marble, therefore, probability of both events will be independent and probability of occurring one event will not affect the probability of second event's occurring.
Since the probability of two independent compound events is always the product of probabilities of both events.

Now let us find probability of picking a red marble out of 16 (4+7+5) marbles.

Probability of picking blue ball out of 16 (4+7+5) marbles:

Now let us find probability of Monica picking a red and then a blue marble.





Therefore, the probability of picking a red and then blue marble is
.
Sasha's family traveled 11,944 miles.
(( 4 round trips = 8 trips ))
(( 1493 x 8 ))
Hope this helps!
Divide the miles he traveled by the time it took him to travel it.
22 1/2 / 1/3
Multiply by the reciprocal of 1/3:
22 1/2 * 3/1
Convert 22 1/2 into an improper fraction:
45/2 * 3/1
Multiply the numerators and denominators together:
135/2
Divide:
67.5 or 67 1/2
So his average speed in miles per hour is 67 1/2.