algebra
posted by barbra .
if there is a 4 digit code and the number choices are 09 and the last two numbers in the code are 0 and 7 what are all the code possibilites?
_ _ 0 7

From 0 to 9 involves 10 digits, and assuming we can start with a 0 and we can repeat a digit, the number of possible codes that end in 07 is 10x10 or 100