Answer:
40
Step-by-step explanation:
Since the probability to choose a blue marble is 1/9, there must be 5 blue marbles since 45 * 1/9 = 5
Subtract 5 from 45 to get 40, since the rest of the marbles are red.
1. 180 miles in 4 hours
180÷4=45 miles an hour
For the train to travel in 7 hrs
45*7=315
2. =3/4
3. B. II & III
See attachment for reply and answer.
Answer:
, as 
Step-by-step explanation:
We can see that the larger the input, the smaller the output
IS this from a book or online