Question 3 The prime factors of 81 are 3,3,3,3. When you pair the 3's together, there is nothing left
over, why is that?

Maybe because 81 is a perfect square

answer:  

step-by-step explanation:

odd numbers are only divisible by 1 and itself.

even numbers are divisible by more than 1 and itself.

for example 6 is even because it is divisible by more than 1 and its self. 1 x 6= 6 ; 2 x 3= 6

and 7 is odd because only 7 x 1 equals seveb