You can only factor
out of both terms:

Answer:
b
d
e
Step-by-step explanation:
the standar form is

so it's

only that
You need to do the ones in the parentheses first
Answer:
A
Step-by-step explanation:
2 meters=2000millimeters
50 centimeters=500 millimeters
Problem A,B,C, and D can be solved using 3*6=18 or 6*3=18