Answer:
24528
Step-by-step explanation:
There are 10 possible digits and 26 possible letters.
To find the answer to this problem we have to multiply 9 as many digits has the hotel reservation number and 26 as many letters it has.
It means:

There are 1,119,214,746 possible reservation numbers.
Answer:
2x + 3y
Step-by-step explanation:
10x + 7x - 15x + 3y=
17 x - 15 x + 3y
2x + 3y
Greeting to you! My name is Cecille and I’m here to answer that question
For more explanation, please see the attachment