Answer:

Step-by-step explanation:
Total number of tickets sold = 3388
Total number of coach tickets = 3069
Total number of first-class tickets = Total number of tickets sold - Total number of coach tickets
= 3388 - 3069
= 319

Ratio of the number of first-class tickets to the total number of tickets = 319:3388
<span>2.98214285714 an hour for 168 hours</span>
Answer:
D f(x)= e^x+ 5x + 19
Step-by-step explanation:
D f(x)= e^x+ 5x + 19