Would you please be able to assist with the following questions and explain the process to getting the answers? The answers/process needs to be in a paper. Thank you.

Question #1

Bella works at sub shop and wants to know how many different types of subs she can make considering all of the available options. There are six types of rolls, five types of meats, eight types of vegetables, and three types of cheeses. If two choices are made from each of the four categories, how many types of subs can Bella make?

Question #2

How many odd, five-digit numbers can be created from the digits 1 to 5 if repetition is allowed?

Question #3

How many ways can four calculators be chosen for testing from a group of 10?