Final answer:
Joe is incorrect as 7 is indeed a multiple of 1.
Step-by-step explanation:
Joe is incorrect in stating that 1 is never a multiple of 7. In fact, 7 is a multiple of 1. A multiple of a number is obtained by multiplying that number by any whole number. So, if we multiply 7 by 1, we get 7 itself.
Learn more about Multiples and Numbers