Question

My homework says name a 2 digit odd number that is prime. name a 2 digit odd number that is composite.

Answer 1

2 digit meaning that it has 2 numbers. For example, 66 is a two digit number.
Now, they also said it must be prime, meaning that its factors can only be 1 and itself. 
Also, it must be odd. 

Answer:  67

Now, do the same, except the number must be composite, as meaning that it has other factors. 

Answer:   21

Answer 2

Prime:

11, 13, 17, 19, 23, 29, 31, +more

Composite:

15, 25, 27, 33, 35, 45, pretty much any 2-digit number ending in 5