To do this, change into common denominators. The common denominator is 21 so change the problem from 1/3 + 1/7 to 7/21 + 3/21. This gives you 10/21. It is already in simplest form.
Answer:
C
Step-by-step explanation:
3/6 = 1/2
Answer:70
Step-by-step explanation:
The GCF of 18 and 39 is 3
