Answer:
the second one and third one
Step-by-step explanation:
Answer:
12
Step-by-step explanation: 12:3=4, 4 x 2= 8
Answer:
Step-by-step explanation:
B, y=5x
Answer:
3
Step-by-step explanation:
Using listing:


No other factors are possible.
Hence, 1, 3, 7 and 21 are factors of 21.