I’m not sure abt 21 but 22 is the second one and the 4th one. So 2,4.
-8/5 is a rational number because in order to be a rational number it must be able to be written as a fraction. -8/5 is a fraction; therefore, the negative does not affect it.
Answer:
7(1-2n)
Step-by-step explanation:
7-14n
Rewrite
7*1 - 7*2n
Factor
7(1-2n)
Answer:

Step-by-step explanation:

Separate
:




Answer:
10-1
Step-by-step explanation: