Determine the GCF of each set of monomials.

1. 20, 30a

2. 35, 20m

3. 13a, 26b, 39c

4. 25x², 75x³, 125x⁴

5. 12a², 15a³, 18a5

SOMEONE PLS HELP ME WITH THIS ONE I CANT UNDERSTAND
IT I HOPE I CAN GET ANSWERS SOON BECAUSE I GOING TO PASS IT ON FRIDAY THANK YOU I REALLY APPRECIATE IT.​​ YUNG MAY SOLVING PO SANA.​