Answer:
Part 1)
or

Part 2)
or

Part 3)

Explanation:
Part 1) what portion of the baguette was used for each sandwich
we know that
To find what portion of the baguette was used for each sandwich, divide one by the number of equally sized sandwiches
so

Part 2) How long, in feet, is one of Craig's sandwiches
To find the length of one sandwich, multiply the total length by the portion that represent each sandwich
so

Part 3) How many inches long is one of Craig's sandwiches
Convert feet to inches
we know that

so
by proportion convert
to inches
